Add 'it compiles' tests

[v-thakkar]

We aim to add tests which can successfully compile on $TARGET for the bunch of crates like libcore etc.
We aim to add these tests no later than July 29, 2018. [Rust 1.28 ship date: 2nd August, 2018].

[sekineh]

libcore can be compiled if x.py dist is succeed.
I guess some crate is needed for this task.

[sekineh]

There are two use cases:

• use rustc directly
• use cargo

[sekineh]

I'm writing here because it's a most basic issue.

Here's my first attempt of run-make which doesn't succeeds:

Makefile snippet v1

run-make/thumb-none-cortex-m/Makefile:

# warning: copy and paste ruined tab char!
-include ../../run-make-fulldeps/tools.mk

ifeq ($(TARGET),thumbv7m-none-eabi)
all:
	env > env.txt
	rm -rf cortex-m
	$(CARGO) clone cortex-m --vers 0.5.0 && cd cortex-m
	$(CARGO) build --target $(TARGET)
else
all:
endif

log and env.txt:

• https://gist.github.com/sekineh/a9e56bb523b071619c9f2b98e5d24d2f

At this attempt, I tried to mimic the following cargo use case:

• https://users.rust-lang.org/t/cortex-m-library-development-now-possible-on-beta-and-the-path-towards-stable-embedded-rust/17420

Available Environment Variables

In env.txt included in the gist, you can see environment variables you can use.
https://gist.github.com/sekineh/a9e56bb523b071619c9f2b98e5d24d2f#file-env-txt

• $(CARGO) is available but it's stage0.

sekineh@sekineh-VirtualBox:~/rustme7$ grep CARGO src/test/run-make/thumb-none-cortex-m/env.txt 
CARGO=/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/stage0/bin/cargo

• stage2 $(RUSTC) is available:

RUSTC=LD_LIBRARY_PATH="/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/test/run-make/thumb-none-cortex-m/thumb-none-cortex-m:/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/stage2/lib:/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/stage0-bootstrap-tools/x86_64-unknown-linux-gnu/release/deps:/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/stage0/lib:" '/home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/stage2/bin/rustc' --out-dir /home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/test/run-make/thumb-none-cortex-m/thumb-none-cortex-m -L /home/sekineh/rustme7/build/x86_64-unknown-linux-gnu/test/run-make/thumb-none-cortex-m/thumb-none-cortex-m  -Clinker=arm-none-eabi-gcc

[sekineh]

What cargo build performs for cortex-m:

(Caution: attempt on Win10 beta-msvc host)

(win 10; workaround "Failed to find tool. Is `ar` installed?" error by providing `env`)

$ cargo clean
$ env AR_thumbv7m-none-eabi=arm-none-eabi-ar cargo build --target thumbv7m-none-eabi -v 2>&1 | tee build_thumbv7m-none-eabi.txt
   Compiling cc v1.0.18
   Compiling vcell v0.1.0
   Compiling aligned v0.2.0
   Compiling bare-metal v0.2.0
     Running `rustc --crate-name cc 'C:\Users\sekineh\.cargo\registry\src\github.com-1ecc6299db9ec823\cc-1.0.18\src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=9126dee9eaeb69ac -C extra-filename=-9126dee9eaeb69ac --out-dir 'C:\Users\sekineh\src\cortex-m\target\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --cap-lints allow`
     Running `rustc --crate-name vcell 'C:\Users\sekineh\.cargo\registry\src\github.com-1ecc6299db9ec823\vcell-0.1.0\src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=855f0aa10a27024c -C extra-filename=-855f0aa10a27024c --out-dir 'C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' --target thumbv7m-none-eabi -C ar=arm-none-eabi-ar -C linker=arm-none-eabi-gcc -L 'dependency=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --cap-lints allow`
     Running `rustc --crate-name aligned 'C:\Users\sekineh\.cargo\registry\src\github.com-1ecc6299db9ec823\aligned-0.2.0\src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=bc95f696e48c7520 -C extra-filename=-bc95f696e48c7520 --out-dir 'C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' --target thumbv7m-none-eabi -C ar=arm-none-eabi-ar -C linker=arm-none-eabi-gcc -L 'dependency=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --cap-lints allow`
     Running `rustc --crate-name bare_metal 'C:\Users\sekineh\.cargo\registry\src\github.com-1ecc6299db9ec823\bare-metal-0.2.0\src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=78f17c947b880b5f -C extra-filename=-78f17c947b880b5f --out-dir 'C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' --target thumbv7m-none-eabi -C ar=arm-none-eabi-ar -C linker=arm-none-eabi-gcc -L 'dependency=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --cap-lints allow`
   Compiling volatile-register v0.2.0
     Running `rustc --crate-name volatile_register 'C:\Users\sekineh\.cargo\registry\src\github.com-1ecc6299db9ec823\volatile-register-0.2.0\src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=709a9f73a0e4731c -C extra-filename=-709a9f73a0e4731c --out-dir 'C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' --target thumbv7m-none-eabi -C ar=arm-none-eabi-ar -C linker=arm-none-eabi-gcc -L 'dependency=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --extern 'vcell=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps\libvcell-855f0aa10a27024c.rlib' --cap-lints allow`
   Compiling cortex-m v0.5.2 (file:///C:/Users/sekineh/src/cortex-m)
     Running `rustc --crate-name build_script_build build.rs --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=a4a6f0362a5801fc -C extra-filename=-a4a6f0362a5801fc --out-dir 'C:\Users\sekineh\src\cortex-m\target\debug\build\cortex-m-a4a6f0362a5801fc' -C 'incremental=C:\Users\sekineh\src\cortex-m\target\debug\incremental' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --extern 'cc=C:\Users\sekineh\src\cortex-m\target\debug\deps\libcc-9126dee9eaeb69ac.rlib'`
     Running `C:\Users\sekineh\src\cortex-m\target\debug\build\cortex-m-a4a6f0362a5801fc\build-script-build`
     Running `rustc --crate-name cortex_m 'src\lib.rs' --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=4556fb5e068fee24 -C extra-filename=-4556fb5e068fee24 --out-dir 'C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' --target thumbv7m-none-eabi -C ar=arm-none-eabi-ar -C linker=arm-none-eabi-gcc -C 'incremental=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\incremental' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps' -L 'dependency=C:\Users\sekineh\src\cortex-m\target\debug\deps' --extern 'aligned=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps\libaligned-bc95f696e48c7520.rlib' --extern 'bare_metal=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps\libbare_metal-78f17c947b880b5f.rlib' --extern 'volatile_register=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\deps\libvolatile_register-709a9f73a0e4731c.rlib' -L 'native=C:\Users\sekineh\src\cortex-m\target\thumbv7m-none-eabi\debug\build\cortex-m-7198b41ea6872672\out' --cfg cortex_m --cfg armv7m -l static=asm`
    Finished dev [unoptimized + debuginfo] target(s) in 3.77s

It's a library crate which is only suitable for it compiles test.

[jamesmunns]

Awesome job @sekineh! Am I understanding correctly that you were able to build the cortex-m crate as a run-make test?

Do you have your code pushed on github somewhere that I could look at?

[sekineh]

Not yet!

The above run is obtained on my local win10 PC using beta-msvc toolchain.
I’m now at day job where win10 is main PC.
The cargo error I workaround is not the same as the error that made run-make fail.

Other useful info:

• cargo has -v and -vv option which displays commands internally run! -vv is better for coverage. We might be able to run equivalent commands individually if cargo attempt finally failed. (As a last resort)
• There's no dry-run option :-(

[sekineh]

Makefile Tips 1) Or logic

We might want to change the ifeq line to use logical or of 4 targets.

ifeq ($(TARGET),thumbv7m-none-eabi)

To do that, see:

• https://stackoverflow.com/questions/7656425/makefile-ifeq-logical-or

[sekineh]

Makefile Tips 2) Failable commands

By default make fails if one of the commands is failed.
To ignore error, add '-' char in the begining of the command.
Ex:

	-rm -rf cortex-m

See:

• https://stackoverflow.com/questions/3477292/what-do-and-do-as-prefixes-to-recipe-lines-in-make

[sekineh]

@jamesmunns
I have not created new branch yet. Currently, just experiments only.

[sekineh]

(Ubuntu) What cargo build performs for cortex-m:

We can use this as a reference

• https://gist.github.com/sekineh/52725fe78a1be281c24be5e57df831ef#file-exec-txt

[sekineh]

Just opened the PR:

• Add crate build test for thumb* targets. [IRR-2018-embedded] rust-lang/rust#53190

[sekineh]

This issue is closed by the successful merge of

• Add crate build test for thumb* targets. [IRR-2018-embedded] rust-lang/rust#53190