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Multiple codegen units breaks linking: "undefined reference to rust_begin_unwind" #47074

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japaric opened this Issue Dec 30, 2017 · 9 comments

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japaric commented Dec 30, 2017 •
edited

STR

$ git clone https://github.com/clebi/stm32_magnetic

$ cd stm32_magnetic

$ git checkout 086b7d9deb1ae7bd3d82d63f65eb9430fab677c1

$ # disable incremental compilation to avoid other issues
$ echo '[profile.dev]' >> Cargo.toml
$ echo 'incremental = false' >> Cargo.toml

$ # discard the Xargo sysroot to avoid problems with stale artifacts
$ rm -rf ~/.xargo

$ # this uses multiple codegen units
$ xargo rustc -- -Z print-link-args > link-args
(..)
  = note: /home/japaric/.xargo/lib/rustlib/thumbv7em-none-eabihf/lib/libcore-82bb515fb6a7673a.rlib(core-82bb515fb6a7673a.core13-a2b2f175d842448d578bfd1df50c2091.rs.rcgu.o): In function `core::panicking::panic_fmt':
          /home/japaric/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/panicking.rs:71: undefined reference to `rust_begin_unwind'

$ cat link-args | tr ' ' '\n'
"arm-none-eabi-ld"
"-L"
"/home/japaric/.xargo/lib/rustlib/thumbv7em-none-eabihf/lib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic0.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic1.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic10.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic11.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic12.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic13.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic14.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic15.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic2.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic3.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic4.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic5.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic6.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic7.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic8.rcgu.o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d.i2c_magnetic9.rcgu.o"
"-o"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/i2c_magnetic-da54b67a466eab3d"
"--gc-sections"
"-L"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps"
"-L"
"/home/japaric/tmp/stm32_magnetic/target/debug/deps"
"-L"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/build/cortex-m-rt-67ae64ff3b026a1b/out"
"-L"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/build/f3-9427da8830940471/out"
"-L"
"/home/japaric/.xargo/lib/rustlib/thumbv7em-none-eabihf/lib"
"-Bstatic"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libcortex_m_rtfm-c0937f58fbde0459.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/librtfm_core-1e85456d9189c8f2.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libuntagged_option-cb0ee6b31e8b5540.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libf3-5f30af66a432ec74.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libstm32f30x-5ab99d65170ba613.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libcortex_m_rt-a656f43a1b217a17.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libr0-eea37c5929500808.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libstatic_ref-4e80cdb2ce553b2f.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libembedded_hal-a5c5f16836b1d4fa.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libcast-c3830481e6a0787e.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libnb-2c1e61e97adbfc28.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libcortex_m-8e97aa6b5ac0c1c3.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libbare_metal-c2470b1735ede45e.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libaligned-ca7b9812ff225cca.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libvolatile_register-a39da4476292d8c3.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libvcell-72540773165f79da.rlib"
"/home/japaric/tmp/stm32_magnetic/target/thumbv7em-none-eabihf/debug/deps/libcortex_m_semihosting-d2a306addcb7fb3a.rlib"
"/home/japaric/.xargo/lib/rustlib/thumbv7em-none-eabihf/lib/libcore-82bb515fb6a7673a.rlib"
"/home/japaric/.xargo/lib/rustlib/thumbv7em-none-eabihf/lib/libcompiler_builtins-21afa2c8d0d459e7.rlib"
"-Tlink.x"
"-Bdynamic"

$ # the linker command succeeds if the objects / archives are wrapped in --start-group / --end-group
$ "arm-none-eabi-ld" --start-group "-L" (..) "-Bdynamic" --end-group && echo OK
OK

$ # the build also succeeds if a single codegen unit is used
$ echo 'codegen-units = 1' >> Cargo.toml
$ rm -rf ~/.xargo && cargo clean
$ xargo build && echo OK
OK

Meta

$ rustc -V
rustc 1.24.0-nightly (77e189cd7 2017-12-28)

cc @alexcrichton @clebi
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japaric commented Dec 30, 2017

After bisecting it seems that this broke between nightly-2017-12-27 (good) and nightly-2017-12-28 (bad).
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alexcrichton commented Dec 30, 2017

@japaric can you confirm where, for the embedded platform here, the symbol rust_begin_unwind is defined? I think this may be the same as #18807 (an ancient bug now!) where rustc doesn't understand this special symbol relationship well enough to pass the right linker flags.
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japaric commented Dec 30, 2017

@alexcrichton the panic_fmt lang item, and several other lang items, is defined in the cortex-m-rt crate.
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alexcrichton commented Dec 31, 2017

Ok cool, makes sense! In that case I believe this is indeed the same issue as #18807.

The compiler knows who needs rust_begin_unwind (libcore) and also knows who defines it (libstd in general and cortex-m-rt in your case). It's the compiler's job to understand that this is a cyclic dependency and insert --start-group and --end-group appropriately but it currently does not.

I believe the correct fix here (and for #18807) is for rustc to detect which crate defines rust_begin_unwind and which crate requires it (std/core in general) and to automatically insert --start-group and --end-group around these libraries. That should be enough to make the linker error go away.

@alexcrichton alexcrichton added the A-linkage label Dec 31, 2017

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japaric commented Jan 11, 2018

ugh, I'm now seeing this linker error in another project when compiling it using the dev profile even though codegen-units is set to 1 and incremental is disabled in the Cargo.toml. My current fix is ... to enable LTO on the dev profile.

@alexcrichton any chance you'll have to time soon to implement the fix you mentioned? Otherwise I can look into it next week, probably.
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alexcrichton commented Jan 11, 2018

@japaric unfortunately I don't think I'll have time to look into this, but I can certainly help out with questions if they come up!
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japaric commented Jan 11, 2018

@alexcrichton alright. I'll ping you on IRC when I get a chance to look into this.

@japaric japaric referenced this issue Jan 17, 2018

Closed

arm-none-eabi-ld not working with v0.3.8 #49

@japaric japaric referenced this issue Feb 26, 2018

Closed

Fix linking issues when using multiple codegen units #53

1 of 1 task complete

dvc94ch added a commit to riscv-rust/riscv-crates that referenced this issue Feb 27, 2018

@dvc94ch
Workaround rust-lang/rust#47074
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@dvc94ch dvc94ch David Craven
GPG key ID: 33B9E9FDE28D2C23 Learn about signing commits
eb605c9

japaric added a commit to rust-embedded/discovery that referenced this issue Mar 2, 2018

@japaric
work around rust-lang/rust#47074
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bors bot added a commit to rust-embedded/discovery that referenced this issue Mar 2, 2018

@bors
Merge #70 
70: work around rust-lang/rust#47074 r=japaric a=japaric
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This was referenced Mar 14, 2018

Closed
Closed

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 23, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
7394e66

@alexcrichton alexcrichton referenced this issue Mar 23, 2018

Merged

rustc: Group linked libraries where needed #49316

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 23, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
60e6480
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alexcrichton commented Mar 23, 2018

I've opened a PR for this at #49316

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 23, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
d67db10

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 25, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
3b41480

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 25, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
eec0d65

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 27, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
8ad2f7f

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 28, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
50ad5f9

bors added a commit that referenced this issue Mar 29, 2018

@bors
Auto merge of #49316 - alexcrichton:start-group-end-group, r=michaelw… 
…oerister

rustc: Group linked libraries where needed

This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes #18807
Closes #47074
Loading status checks…
0579f55

alexcrichton added a commit to alexcrichton/rust that referenced this issue Mar 29, 2018

@alexcrichton
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
Loading status checks…
88114f6

bors added a commit that referenced this issue Mar 29, 2018

@bors
Auto merge of #49316 - alexcrichton:start-group-end-group, r=michaelw… 
…oerister

rustc: Group linked libraries where needed

This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes #18807
Closes #47074
Loading status checks…
491f4bf

@bors bors closed this in #49316 Mar 30, 2018

@japaric japaric referenced this issue Apr 8, 2018

Merged

v0.4.0: with LLD support #64

XAMPPRocky added a commit to XAMPPRocky/rust that referenced this issue May 1, 2018

@alexcrichton @XAMPPRocky
rustc: Group linked libraries where needed 
This commit fixes a longstanding issue with the compiler with circular
dependencies between libcore and libstd. The `core` crate requires at least one
symbol, the ability to unwind. The `std` crate is the crate which actually
defines this symbol, but the `std` crate also depends on the `core` crate.

This circular dependency is in general disallowed in Rust as crates cannot have
cycles amongst them. A special exception is made just for core/std, but this is
also unfortunately incompatible with how GNU linkers work. GNU linkers will
process undefined symbols in a left-to-right fashion, only actually linking an
rlib like libstd if there are any symbols used from it. This strategy is
incompatible with circular dependencies because if we otherwise don't use
symbols from libstd we don't discover that we needed it until we're later
processing libcore's symbols!

To fix this GNU linkers support the `--start-group` and `--end-group` options
which indicate "libraries between these markers may have circular dependencies
amongst them. The linker invocation has been updated to automatically pass these
arguments when we're invoking a GNU linker and automatically calculate where the
arguments need to go (around libstd and libcore)

Closes rust-lang#18807
Closes rust-lang#47074
69aff88

berkus added a commit to metta-systems/vesper that referenced this issue Nov 10, 2018

@berkus
Restore parallel codegen and incr builds 
rust-lang/rust#47074 is fixed now.
7c59fc3
@MightyPork

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MightyPork commented Feb 12, 2019 •
edited

I just had something similar with rustc 1.32.0 (9fda7c223 2019-01-16).
Should I start a new issue for it? It might be some regression relating to this

It's an error in the final linking stage, but when I use --release it builds fine


error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.103nc01ggz589tir.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.12m8s5r5anbfzg9v.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.141i1tp491ko5omv.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1542hx8kcttvi3nb.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.169pth8q4y7rjniq.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.184gw8tg84o2p57y.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1bsia0210fgh8nr9.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1crb2srru79bmmlu.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1ed17dbidgmc509p.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1el88c7nruu5cbr4.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1emikl2qjffy39w7.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1f1xcxz9pyv4rqrx.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1f7hrbwxzjggwyry.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1fcfw8ng9gyo1uie.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1k5qg3t4kamnexut.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1k6ulb8s8ztebkl4.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1nofbco4w9frmp2r.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.1qtfydvbrp3zo1z6.rcgu.o" 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"/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.hmyrqi9zey0wpu1.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.ho4ksxnek7sba57.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.hq53k8ph3jamt7r.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.hvht1d2kqhslabl.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.i4zeh7jndix8e2n.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.j6e2b7k27oe82al.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.jrna5zbasokpf2m.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.jy09lslvve5b3pe.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.k0aqc79oy06zu6q.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.kcfqulghu1figgb.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.l14x8krwsmm2pm2.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.laanp149dx676yk.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.nd537809zkcq2xy.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.rigz6sydaai7dm3.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.sb917jg20m3ilkj.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.u7yddjjtkau8qnl.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.wp94l4vwz0l3sdw.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.xxlcf64cey3k2kz.rcgu.o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.yyui27bmlkwc53y.rcgu.o" "-o" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39" "/home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.4t8u1cod8fepdt2e.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/ondra/rust/camproxy/target/debug/deps" "-L" "/home/ondra/rust/camproxy/target/debug/build/rust-crypto-0d1e6632a568be3b/out" "-L" "/home/ondra/rust/camproxy/target/debug/build/brotli-sys-5a85bee7a2ae1e95/out" "-L" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/ondra/rust/camproxy/target/debug/deps/librouille-69046b5d48cba6cd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libthreadpool-bd7e78ac63cf4549.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtiny_http-23614bea4093b265.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libchunked_transfer-407a4571f863f284.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libascii-286c68e889436ca9.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsha1-2ec5a788d56b0240.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand-3a2637974bc48e36.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmultipart-b880158c89d7529c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtwoway-5773b6324abdd02f.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbuf_redux-c27aef689593f9ac.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsafemem-2347610db5c680e2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmemchr-f3a9c9af23b3e0be.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libquick_error-d076393f8637c292.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtempdir-f5defff6264db41c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libremove_dir_all-4fa41e3b80f0305f.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmime_guess-51205de0ae6203b9.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmime-0addd24185afd27e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblog-b88f65a6c0a30aa4.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libfiletime-288befac23ecafed.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libchrono-c3206ff53241709b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbrotli2-f640686182c5c933.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbrotli_sys-96e95df303d7a52e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbase64-3a7d8bc0294c3ca2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsafemem-93527bca1604d063.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libreqwest-90fd8ee456afe195.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libuuid-ede359e7941b29e0.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libserde_urlencoded-82efa61d375a28dd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liburl-33fdcc9560355a8b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libpercent_encoding-ac5cafde783ab644.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libidna-536ce72a4470265a.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libunicode_normalization-3f355d1cdb447f6d.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libunicode_bidi-27d83b52c6d9ffc2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmatches-11044e45e5f5d130.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libdtoa-064ec73550288557.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libserde_json-60553b8760404a99.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libryu-6558757443f9190e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmime_guess-d70bec2ad5b9ffc0.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libphf-7fd76f4af48d6a0d.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libphf_shared-1d0f8675be7eb0a5.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libunicase-dc62e6750392084a.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsiphasher-ca107af637beebaa.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmime-fb31a5e617b6a202.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libunicase-9f48845e88013843.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblibflate-32519dc6f56e5cbc.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrc32fast-2e6153384f04b7d6.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libhyper_tls-306782d3e161a4b7.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnative_tls-fd28df375e657a1f.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libopenssl_probe-6819bb221d559c18.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libopenssl-31e4a5e98c051de0.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libopenssl_sys-09d6c1331924e5cc.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libforeign_types-aad92082f7cc0f15.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libforeign_types_shared-525b92e9fa3208ad.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libhyper-d7827e8176af0392.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libwant-f377f57f6c6f5c98.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtry_lock-c24bfc74fbb18a1d.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_tcp-6b9580b425c6c12c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio-be5c4b3cf0c15857.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_timer-c4e30af89193541c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_threadpool-d7f7a087357379c7.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam-3ee1275a8c75f2af.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_channel-19bb93a1f1d32ac9.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_deque-7b2b881cfd120bf4.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_epoch-97451a92526e97f0.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_reactor-d4f35cc4dfbf591d.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_current_thread-b8cdd96ace872b22.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_executor-f9cf9034f397adfe.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_utils-d1e2d836aaee6044.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmio-4d1a4909ddec4bc8.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblazycell-03bf8f709df4eabd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnet2-7b9cfde64e42857e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libhttparse-2dc05d372c1a93b7.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libh2-8e653d49ce03d2fb.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libindexmap-8d9bded0f47a1104.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libstring-18a5b01a4a5e2575.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libslab-5b96405ce556748b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtokio_io-e76131e3775c90bd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblog-c3446220cd684946.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libfutures_cpupool-12de9a95287e5e2a.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libhttp-8f9e933a8efeda1f.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libitoa-48e624e350b88ca2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libfnv-de0c071f3d02cd92.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libfutures-9876026b2cd27988.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libencoding_rs-938144d6530ee061.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbytes-0ebe3c59fdf20f1b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libiovec-9800841355731653.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbase64-614301bb3ff84f33.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libdigest_auth-88681053e2828204.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libhex-df545491878112c1.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrypto-fc76dcb7d7c5dbfd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtime-a5bc5dca8ebdc9a7.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librustc_serialize-d91d28fc1e6df52c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand-0019be5d5e630f30.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand-7d3d92cf191e26bc.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libserde-29c752743a49150b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libparking_lot-4d194aa3f0dde1ae.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libparking_lot_core-ef6c96439a08c1bf.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsmallvec-ec7449da6f29e309.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libunreachable-f82bf708cd2a7555.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libvoid-29e9e96c75308535.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand-941ebd74d757d215.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_xorshift-c858e8f9ec84c127.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_pcg-e53079435082fdcb.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_hc-d9ce3c6e74ec8734.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_chacha-0fa9e17c2e912ae2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_isaac-795884cd9d48debf.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_core-ef5ca41dc17830bd.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_os-f6c6fc467aa10239.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_jitter-2ac0e886c468b03e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librand_core-c44f9a54e74e1de3.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblock_api-372284a73b54e57e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libowning_ref-2ac6d58a0aadcbc1.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libstable_deref_trait-83b46d96ec33e001.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libimage-e6d4d7cd0d2f637b.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libtiff-45ef6ffffc6e833d.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libpng-d53b9863aa5201ff.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libdeflate-04fd1afe52f20d70.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libgzip_header-f57ccc060deca441.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrc-dfb00699536d8716.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libinflate-e7d698a22dfeb137.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libadler32-831f34afde0b44c8.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbitflags-f4c5ccff822b82c9.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libjpeg_decoder-b3f42e78f2da6dd9.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librayon-48a5f676c3acb200.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libeither-cafae82f01e79117.rlib" "/home/ondra/rust/camproxy/target/debug/deps/librayon_core-fce744df2407a375.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnum_cpus-452a17f51782b7ba.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblibc-e1ff536ab604bb39.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_deque-000970e69a9c8f10.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_epoch-ab6809434ddf75f1.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libscopeguard-c76e49e09b06b559.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libmemoffset-a0c0b3f18ac73f88.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblazy_static-e15de2558ea751ff.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcrossbeam_utils-4dc0b05be525bf3e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcfg_if-6cb3c784327a57da.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libarrayvec-372b20980ad98440.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnodrop-0b0236a8ee22c97c.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libscoped_threadpool-5c6ba7ea7fb4a7a2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libgif-e3cd96ae23121625.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libcolor_quant-448f1e1c3d4dd5d2.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libsafe_transmute-c80d4e3d72e35c13.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnum_rational-0c82be96dcb20f29.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnum_iter-fad9ce057047ab12.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnum_integer-cc9242e580a2706a.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libnum_traits-f73ab1c2c54c610e.rlib" "/home/ondra/rust/camproxy/target/debug/deps/liblzw-b16a85132ebd7221.rlib" "/home/ondra/rust/camproxy/target/debug/deps/libbyteorder-7c97eb447b75b07f.rlib" "-Wl,--start-group" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-dd4752c70d4ce71d.rlib" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-e04840eda0100e05.rlib" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-16bfb4d182748e63.rlib" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-185d9b81685a2f08.rlib" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-4806247fe4c34e64.rlib" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-879310dc3b96af61.rlib" "-Wl,--end-group" "/home/ondra/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-d0572f7a936161bf.rlib" "-Wl,-Bdynamic" "-lssl" "-lcrypto" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
  = note: /usr/bin/ld: /home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39.5amrcr6mjxcim2jn.rcgu.o: in function `camproxy::camera::Camera::fetch_update_readonly':
          /home/ondra/rust/camproxy/src/camera.rs:285: undefined reference to `image::dynimage::DynamicImage::write_to'
          /usr/bin/ld: /home/ondra/rust/camproxy/target/debug/deps/camproxy-82c67e89c191de39: hidden symbol `_ZN5image8dynimage12DynamicImage8write_to17hb0bdbdebabd7767eE' isn't defined
          /usr/bin/ld: final link failed: bad value
          collect2: error: ld returned 1 exit status
          

error: aborting due to previous error

error: Could not compile `camproxy`.

Caused by:
  process didn't exit successfully: `rustc --edition=2018 --crate-name camproxy src/main.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=82c67e89c191de39 -C extra-filename=-82c67e89c191de39 --out-dir /home/ondra/rust/camproxy/target/debug/deps -C incremental=/home/ondra/rust/camproxy/target/debug/incremental -L dependency=/home/ondra/rust/camproxy/target/debug/deps --extern digest_auth=/home/ondra/rust/camproxy/target/debug/deps/libdigest_auth-88681053e2828204.rlib --extern image=/home/ondra/rust/camproxy/target/debug/deps/libimage-e6d4d7cd0d2f637b.rlib --extern parking_lot=/home/ondra/rust/camproxy/target/debug/deps/libparking_lot-4d194aa3f0dde1ae.rlib --extern rand=/home/ondra/rust/camproxy/target/debug/deps/librand-941ebd74d757d215.rlib --extern reqwest=/home/ondra/rust/camproxy/target/debug/deps/libreqwest-90fd8ee456afe195.rlib --extern rouille=/home/ondra/rust/camproxy/target/debug/deps/librouille-69046b5d48cba6cd.rlib --extern serde=/home/ondra/rust/camproxy/target/debug/deps/libserde-29c752743a49150b.rlib --extern serde_derive=/home/ondra/rust/camproxy/target/debug/deps/libserde_derive-f373b9e9aaa0f325.so --extern serde_json=/home/ondra/rust/camproxy/target/debug/deps/libserde_json-60553b8760404a99.rlib --extern url=/home/ondra/rust/camproxy/target/debug/deps/liburl-33fdcc9560355a8b.rlib -L native=/home/ondra/rust/camproxy/target/debug/build/rust-crypto-0d1e6632a568be3b/out -L native=/home/ondra/rust/camproxy/target/debug/build/brotli-sys-5a85bee7a2ae1e95/out` (exit code: 1)

the work-around from here also helped

[profile.dev]
opt-level = 1
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