Fix dllimports of static data from rlibs #28646

vadimcn · Sep 25, 2015

As discussed in the referenced issues, this PR makes rustc emit __imp_<symbol> stubs for all public static data to ensure smooth linking in on -windows-msvc targets.
Resolves #26591, cc #27438

rust-highfive · Sep 25, 2015

r? @nikomatsakis

(rust_highfive has picked a reviewer for you, use r? to override)

vadimcn · Sep 25, 2015

r? @alexcrichton

alexcrichton · Sep 25, 2015

alexcrichton reviewed Sep 25, 2015

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alexcrichton · Sep 25, 2015

src/test/run-make/msvc-data-only/bar.rs

+extern crate foo;
+
+fn main() {
+    println!("The answer is {} !", foo::FOO);


Could this be a run-pass instead of a run-make test? Without any C dependencies it should be fine for inclusion there. You'll need to tag the dependency as // no-prefer-dynamic as well as #![crate_type = "rlib"] to ensure it's not built as a DLL, however.

alexcrichton · Sep 25, 2015

alexcrichton reviewed Sep 25, 2015

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alexcrichton · Sep 25, 2015

src/librustc_trans/trans/base.rs

+// when using MSVC linker.  We do this only for data, as linker can fix up
+// code references on its own.
+// See #26591, #27438
+fn create_imps(cx: &SharedCrateContext, _reachable: &HashSet<&str>) {


Should this _reachable parameter be dropped?

Oh yeah, I was not sure if I should filter them through reachable, like internalize_symbols does. Can a symbol have external linkage while not being reachable?

I think it's a safe assumption that any static with external linkage at this point was a reachable static. Either it was taken care of during emission or internalize_symbols internalized all the non-reachable ones I believe

alexcrichton · Sep 25, 2015

alexcrichton reviewed Sep 25, 2015

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alexcrichton · Sep 25, 2015

src/librustc_trans/trans/base.rs

@@ -2824,6 +2856,12 @@ pub fn trans_crate(tcx: &ty::ctxt, analysis: ty::CrateAnalysis) -> CrateTranslat
                            &reachable_symbols.iter().map(|x| &x[..]).collect());
    }

+    if sess.target.target.options.is_like_msvc &&
+       sess.crate_types.borrow().iter().any(|ct| *ct == config::CrateTypeRlib ||
+                                                 *ct == config::CrateTypeStaticlib) {


We can only do this for rlibs, right? If you're producing a staticlib then on one else is going to be referencing this crate's globals via dllimport (not correctly, at least), right?

Hmm, yeah, that's probably right.

vadimcn · Sep 26, 2015

r?

alexcrichton · Sep 26, 2015

@bors: r+ 38f1c47

Thanks!

bors · Sep 26, 2015

⌛️ Testing commit 38f1c47 with merge 7bf4c88...

bors · Sep 27, 2015

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt

alexbool · Sep 29, 2015

Am I right, this PR should fix link errors on msvc platforms that look like #28169?
The problem is that it still crashes on the freshest nightly :(

alexcrichton · Sep 29, 2015

Hm yeah this should fix issues like that, what version of the compiler are you using? I just downloaded the latest nightly and tested it out and it worked for me, so perhaps a stale download link was used? Or maybe the wrong compiler?

alexcrichton · Sep 29, 2015

ah, also nominating for a backport to beta

alexbool · Sep 29, 2015

I tried the x86_64 and it really worked! But what I am really interested in is i686...
Some info below:

Александр@VAIO-FZ13 MINGW64 /c/link-crash
$ which rustc
/c/Program Files/rust-nightly-i686-pc-windows-msvc/rustc/bin/rustc

Александр@VAIO-FZ13 MINGW64 /c/link-crash
$ which cargo
/c/Program Files/rust-nightly-i686-pc-windows-msvc/cargo/bin/cargo

Александр@VAIO-FZ13 MINGW64 /c/link-crash
$ rustc -vV
rustc 1.5.0-nightly (6108e8c3e 2015-09-28)
binary: rustc
commit-hash: 6108e8c3e5e5768d9862ba0f66f44cbca098d015
commit-date: 2015-09-28
host: i686-pc-windows-msvc
release: 1.5.0-nightly

Александр@VAIO-FZ13 MINGW64 /c/link-crash
$ cargo build
   Compiling libc v0.1.10
   Compiling log v0.3.2
   Compiling link-crash v0.1.0 (file:///C:/link-crash)
error: linking with `link.exe` failed: exit code: 1120
note: "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC/bin\\link.exe" "/LIBPATH:C:\\Program Files (x86
)\\Microsoft Visual Studio 14.0\\VC/lib\\" "/LIBPATH:C:\\Program Files (x86)\\Windows Kits\\10\\Lib\\10.0.10150.
0\\ucrt\\x86" "/LIBPATH:C:\\Program Files (x86)\\Windows Kits\\8.1\\Lib\\winv6.3\\um\\x86" "/NOLOGO" "/NXCOMPAT"
 "/LIBPATH:C:\\Program Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib"
 "C:\\link-crash\\target\\debug\\link_crash.0.o" "/OUT:C:\\link-crash\\target\\debug\\link_crash.exe" "/OPT:REF,
ICF" "/DEBUG" "C:\\link-crash\\target\\debug\\liblink_crash.rlib" "C:\\link-crash\\target\\debug\\deps\\liblog-6
e27e2da5513596d.rlib" "C:\\link-crash\\target\\debug\\deps\\liblibc-165b5479aec0459c.rlib" "C:\\Program Files\\r
ust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib\\libstd-10cbabc2.rlib" "C:\\Pro
gram Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib\\libcollections-10
cbabc2.rlib" "C:\\Program Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\l
ib\\librustc_unicode-10cbabc2.rlib" "C:\\Program Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\
i686-pc-windows-msvc\\lib\\librand-10cbabc2.rlib" "C:\\Program Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\
bin\\rustlib\\i686-pc-windows-msvc\\lib\\liballoc-10cbabc2.rlib" "C:\\Program Files\\rust-nightly-i686-pc-window
s-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib\\liballoc_system-10cbabc2.rlib" "C:\\Program Files\\rust-
nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib\\liblibc-10cbabc2.rlib" "C:\\Progra
m Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib\\libcore-10cbabc2.rli
b" "/LIBPATH:C:\\link-crash\\target\\debug" "/LIBPATH:C:\\link-crash\\target\\debug\\deps" "/LIBPATH:C:\\Program
 Files\\rust-nightly-i686-pc-windows-msvc\\rustc\\bin\\rustlib\\i686-pc-windows-msvc\\lib" "/LIBPATH:C:\\link-cr
ash\\.rust\\bin\\i686-pc-windows-msvc" "/LIBPATH:C:\\link-crash\\bin\\i686-pc-windows-msvc" "kernel32.lib" "shel
l32.lib" "msvcrt.lib" "ws2_32.lib" "userenv.lib" "advapi32.lib" "kernel32.lib" "shell32.lib" "msvcrt.lib" "compi
ler-rt.lib"
note: link_crash.0.o : warning LNK4217: locally defined symbol __ZN20MAX_LOG_LEVEL_FILTER20h6a83dca2b222a128EaaE
 imported in function __ZN15Logger$LT$E$GT$6do_log21h11022588445185383603E
link_crash.0.o : warning LNK4217: locally defined symbol __ZN4sync6atomic11atomic_load14_MSG_FILE_LINE20hb23f8a4
c7daca952RbKE imported in function __ZN4sync6atomic11atomic_load20h6038998186637377380E
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4217: locally defined symbol __ZN4sync6atomi
c11atomic_load14_MSG_FILE_LINE20hb23f8a4c7daca952RbKE imported in function __ZN4iter27Enumerate$LT$I$GT$.Iterato
r4next20h3246140536557949847E
link_crash.0.o : warning LNK4217: locally defined symbol __ZN4sync6atomic11atomic_load14_MSG_FILE_LINE20hb23f8a4
c7daca952ccKE imported in function __ZN4sync6atomic11atomic_load20h6038998186637377380E
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4049: locally defined symbol __ZN4sync6atomi
c11atomic_load14_MSG_FILE_LINE20hb23f8a4c7daca952ccKE imported
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4217: locally defined symbol __ZN5ascii19ASC
II_LOWERCASE_MAP20hac5b35c34bc02cd2r8aE imported in function __ZN5ascii11u8.AsciiExt18to_ascii_lowercase20hc17d3
0bbfc4cf83fA2aE
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4217: locally defined symbol __ZN6option15Op
tion$LT$T$GT$6unwrap14_MSG_FILE_LINE20hb23f8a4c7daca9524tNE imported in function __ZN6option15Option$LT$T$GT$6un
wrap20h3963608452739003467E
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN6option15Option$LT$T$GT$6un
wrap14_MSG_FILE_LINE20hb23f8a4c7daca9524tNE imported
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4217: locally defined symbol __ZN4sync6atomi
c12atomic_store14_MSG_FILE_LINE20hb23f8a4c7daca952LaKE imported in function __ZN4sync6atomic12atomic_store21h142
34137121443170045E
liblog-6e27e2da5513596d.rlib(log-6e27e2da5513596d.0.o) : warning LNK4217: locally defined symbol __ZN4sync6atomi
c12atomic_store14_MSG_FILE_LINE20hb23f8a4c7daca9526aKE imported in function __ZN4sync6atomic12atomic_store21h142
34137121443170045E
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN7raw_vec11alloc_guard14_MSG
_FILE_LINE20h23e862067ca87a82TsbE imported in function __ZN5error101Box$LT$Error$u2b$$u20$Send$u20$$u2b$$u20$Syn
c$u20$$u2b$$u20$$u27$a$GT$.From$LT$$RF$$u27$b$u20$str$GT$4from20h29fbba5b1fad06c78daE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN7raw_vec11a
lloc_guard14_MSG_FILE_LINE20h23e862067ca87a82TsbE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN6option15Option$LT$T$GT$6ex
pect15__STATIC_FMTSTR20h3dea4d7f9b96dce1ptNE imported in function __ZN3vec12Vec$LT$T$GT$7reserve21h1607928223866
7312862E
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN6option15Op
tion$LT$T$GT$6expect15__STATIC_FMTSTR20h3dea4d7f9b96dce1ptNE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN6option15Option$LT$T$GT$6ex
pect10_FILE_LINE20h428926c3c48c3a419sNE imported in function __ZN3vec12Vec$LT$T$GT$7reserve21h160792822386673128
62E
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN6option15Op
tion$LT$T$GT$6expect10_FILE_LINE20h428926c3c48c3a419sNE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN6result24Result$LT$T$C$$u20
$E$GT$6unwrap15__STATIC_FMTSTR20h3dea4d7f9b96dce1DbOE imported in function __ZN6thread4park20h68824b9a40d94b79FA
bE
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN6result24Result$LT$T$C$$u20
$E$GT$6unwrap10_FILE_LINE20h428926c3c48c3a41nbOE imported in function __ZN6thread4park20h68824b9a40d94b79FAbE
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN4cell16RefCell$LT$T$GT$10bo
rrow_mut14_MSG_FILE_LINE20hb23f8a4c7daca9529tKE imported in function __ZN4rand13ThreadRng.Rng8next_u6420h5206e2e
b7fbb98d1lwxE
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5slice54_$u5b$T$u5d$.ops..I
ndex$LT$ops..Range$LT$usize$GT$$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952rOPE imported in function __ZN3sys2o
s12error_string20hecf08faf6ec2bfdfKHvE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN5slice54_$u
5b$T$u5d$.ops..Index$LT$ops..Range$LT$usize$GT$$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952rOPE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN6string6String8truncate14_M
SG_FILE_LINE20hea0af16c5f6bd6f9eOfE imported in function __ZN3sys2os12error_string20hecf08faf6ec2bfdfKHvE
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5slice54_$u5b$T$u5d$.ops..I
ndex$LT$ops..Range$LT$usize$GT$$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952YNPE imported in function __ZN3sys2o
s12Env.Iterator4next20h88d9e8399861ea3c6KvE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN5slice54_$u
5b$T$u5d$.ops..Index$LT$ops..Range$LT$usize$GT$$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952YNPE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN7raw_vec15RawVec$LT$T$GT$13
shrink_to_fit14_MSG_FILE_LINE20h23e862067ca87a82BpbE imported in function __ZN3ffi5c_str7CString18from_vec_unche
cked20h360ec22bac5862a7wDeE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN7raw_vec15R
awVec$LT$T$GT$13shrink_to_fit14_MSG_FILE_LINE20h23e862067ca87a82BpbE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5slice57_$u5b$T$u5d$.ops..I
ndexMut$LT$ops..Range$LT$usize$GT$$GT$9index_mut14_MSG_FILE_LINE20hb23f8a4c7daca952RQPE imported in function __Z
N2io4Read14read_to_string20h5208782761598478823E
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN3vec12Vec$LT$T$GT$5drain14_
MSG_FILE_LINE20hea0af16c5f6bd6f9GzgE imported in function __ZN2io8buffered18BufWriter$LT$W$GT$9flush_buf20h87407
03657607558764E
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5slice39_$u5b$T$u5d$.ops..I
ndexMut$LT$usize$GT$9index_mut14_MSG_FILE_LINE20hb23f8a4c7daca9523MPE imported in function __ZN3net6parser20Pars
er$LT$$u27$a$GT$19read_ipv6_addr_impl11read_groups20h670e4c18482dcebe6vjE
librand-10cbabc2.rlib(rand-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN5slice39_$u5b$T$u5d$.ops.
.IndexMut$LT$usize$GT$9index_mut14_MSG_FILE_LINE20hb23f8a4c7daca9523MPE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN4cell16RefCell$LT$T$GT$6bor
row14_MSG_FILE_LINE20hb23f8a4c7daca952ptKE imported in function __ZN10sys_common11thread_info3set20h7b1ab3da9c63
92c5c3rE
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5slice36_$u5b$T$u5d$.ops..I
ndex$LT$usize$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952eMPE imported in function __ZN4hash3sip16SipHasher.Has
her5write20he995307452470973XGTE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN5slice36_$u
5b$T$u5d$.ops..Index$LT$usize$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952eMPE imported
librand-10cbabc2.rlib(rand-10cbabc2.0.o) : warning LNK4049: locally defined symbol __ZN5slice36_$u5b$T$u5d$.ops.
.Index$LT$usize$GT$5index14_MSG_FILE_LINE20hb23f8a4c7daca952eMPE imported
libstd-10cbabc2.rlib(std-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5isaac5EMPTY20h7c76c371cbc6
037aFhbE imported in function __ZN4rand6StdRng3new20hfd7a7d67da92a33bTqxE
libcollections-10cbabc2.rlib(collections-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN5u_str15UTF
8_CHAR_WIDTH20h448f3234fdd35abd79gE imported in function __ZN6string6String15from_utf8_lossy20hd447a128cc475435X
AfE
librustc_unicode-10cbabc2.rlib(rustc_unicode-10cbabc2.0.o) : warning LNK4217: locally defined symbol __ZN4char12
char.CharExt8to_digit14_MSG_FILE_LINE20hb23f8a4c7daca952CJKE imported in function __ZN4char4char8is_digit20h41d2
1f466880a7d5MthE
link_crash.0.o : error LNK2019: unresolved external symbol __imp___ZN15Logger$LT$E$GT$6do_log15__STATIC_FMTSTR20
hf5db1df99b097f02HbaE referenced in function __ZN15Logger$LT$E$GT$6do_log21h11022588445185383603E
link_crash.0.o : error LNK2019: unresolved external symbol __imp___ZN15Logger$LT$E$GT$6do_log4_LOC20h021bff66b31
ba9b7HaaE referenced in function __ZN15Logger$LT$E$GT$6do_log21h11022588445185383603E
C:\link-crash\target\debug\link_crash.exe : fatal error LNK1120: 2 unresolved externals

error: aborting due to previous error
Could not compile `link-crash`.

To learn more, run the command again with --verbose.

alexcrichton · Sep 29, 2015

Oh dear, that is indeed bad! Looks like the naming conventions are different for 32-bit than they are for 64. Who knew! I'm working on a patch, thanks for letting us know @alexbool!

alexcrichton · Oct 1, 2015

Accepting for backport to beta

rust-highfive assigned nikomatsakis Sep 25, 2015

rust-highfive assigned alexcrichton and unassigned nikomatsakis Sep 25, 2015

Fix dllimports of static data from rlibs

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e82bb91

vadimcn force-pushed the vadimcn:imps branch from 38e6ad7 to e82bb91 Sep 25, 2015

alexcrichton referenced this pull request Sep 25, 2015
Open
Correctly handle dllimport on Windows/MSVC #27438

vadimcn added some commits Sep 26, 2015

Converted test to rpass.

c21fcac

Removed unused parameter.

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38f1c47

bors merged commit 38f1c47 into rust-lang:master Sep 27, 2015
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trans: Fix __imp_ creation for i686 MSVC #28741

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Linker Error on nightly msvc 32bit, maybe related to FnBox #28799

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Backporting accepted PRs to beta #28802

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Building fails on rust 1.3 x86_64.pc-windows-msvc #355

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Linking fails when only a lib's static variables are used and none of its functions are called. #29267

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Fix dllimports of static data from rlibs #28646

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