Build fails on osx with /usr/bin/cc is not able to compile a simple test program.

[hu55a1n1]

My build script fails only on Mac (macOS Mojave 10.14.6). It works fine on linux.
Also tried setting CMAKE_C_COMPILER_WORKS but then I get errors like fatal error: 'stdio.h' file not found.

Here's the relevant part of my build.rs -

    let dst = Config::new("mylib-core")
        .profile("MinSizeRel")
        .define("USE_CURL", "OFF")
        .build_target("mylib")
        .build();

    println!("cargo:rustc-link-search=native={}/build/lib", dst.display());
    println!("cargo:rustc-link-lib=static=mylib");

Here's the output -

error: failed to run custom build command for `mylib-sys v0.1.0 (/Users/dev/mylib-core/rust/mylib-sys)`

Caused by:
  process didn't exit successfully: `/Users/dev/mylib-core/rust/target/debug/build/mylib-sys-f177755e646ed510/build-script-build` (exit code: 101)
--- stdout
cargo:rerun-if-env-changed=MACOSX_DEPLOYMENT_TARGET
running: "cmake" "/Users/dev/mylib-core/rust/mylib-sys/mylib-core" "-DCMAKE_OSX_ARCHITECTURES=x86_64" "-DCMAKE_OSX_SYSROOT=macosx" "-DCMAKE_OSX_DEPLOYMENT_TARGET=" "-DUSE_CURL=OFF" "-DDEV_NO_INTRN_PTR=OFF" "-DCMAKE_INSTALL_PREFIX=/Users/dev/mylib-core/rust/target/debug/build/mylib-sys-83508180fe1bf192/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=MinSizeRel"
-- The C compiler identification is AppleClang 10.0.1.10010046
-- The CXX compiler identification is AppleClang 10.0.1.10010046
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- broken
-- Configuring incomplete, errors occurred!
See also "/Users/dev/mylib-core/rust/target/debug/build/mylib-sys-83508180fe1bf192/out/build/CMakeFiles/CMakeOutput.log".
See also "/Users/dev/mylib-core/rust/target/debug/build/mylib-sys-83508180fe1bf192/out/build/CMakeFiles/CMakeError.log".

--- stderr
CMake Error at /usr/local/Cellar/cmake/3.16.1/share/cmake/Modules/CMakeTestCCompiler.cmake:60 (message):
  The C compiler

    "/usr/bin/cc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /Users/dev/mylib-core/rust/target/debug/build/mylib-sys-83508180fe1bf192/out/build/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/bin/make cmTC_b026a/fast && /Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/cmTC_b026a.dir/build.make CMakeFiles/cmTC_b026a.dir/build
    Building C object CMakeFiles/cmTC_b026a.dir/testCCompiler.c.o
    /usr/bin/cc   -ffunction-sections -fdata-sections -fPIC -m64  -arch x86_64 -isysroot macosx   -o CMakeFiles/cmTC_b026a.dir/testCCompiler.c.o   -c /Users/dev/mylib-core/rust/target/debug/build/mylib-sys-83508180fe1bf192/out/build/CMakeFiles/CMakeTmp/testCCompiler.c
    clang: warning: no such sysroot directory: 'macosx' [-Wmissing-sysroot]
    Linking C executable cmTC_b026a
    /usr/local/Cellar/cmake/3.16.1/bin/cmake -E cmake_link_script CMakeFiles/cmTC_b026a.dir/link.txt --verbose=1
    /usr/bin/cc  -ffunction-sections -fdata-sections -fPIC -m64  -arch x86_64 -isysroot macosx -Wl,-search_paths_first -Wl,-headerpad_max_install_names   CMakeFiles/cmTC_b026a.dir/testCCompiler.c.o  -o cmTC_b026a 
    clang: warning: no such sysroot directory: 'macosx' [-Wmissing-sysroot]
    ld: library not found for -lSystem
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    make[1]: *** [cmTC_b026a] Error 1
    make: *** [cmTC_b026a/fast] Error 2
    
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:39 (project)


thread 'main' panicked at '
command did not execute successfully, got: exit code: 1

build script failed, must exit now', /Users/dev/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.43/src/lib.rs:1104:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

warning: build failed, waiting for other jobs to finish...
error: build failed

[alexcrichton]

The error message there indicates ld: library not found for -lSystem which means that something is wrong with the linker, which means that there may be something wrong with cross-compilation or something like that. I don't believe it's an issue with this crate, though, so closing.

[JonathanHenson]

I don't think this is a problem with the linker. I build C and C++ on my machine all day via cmake. something is wrong with the emited cmake. Here's my output:

running: "cmake" "/Users/henso/source/aws-crt-rust/aws-common-runtime/aws-c-common" "-DCMAKE_OSX_ARCHITECTURES=x86_64" "-DCMAKE_OSX_SYSROOT=macosx" "-DCMAKE_OSX_DEPLOYMENT_TARGET=" "-DCMAKE_INSTALL_PREFIX=/Users/henso/source/aws-crt-rust/target/debug/build/aws-crt-rust-1e31957a34af6229/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=Debug"
-- The C compiler identification is AppleClang 10.0.1.10010046
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- broken
-- Configuring incomplete, errors occurred!
See also "/Users/henso/source/aws-crt-rust/target/debug/build/aws-crt-rust-1e31957a34af6229/out/build/CMakeFiles/CMakeOutput.log".
See also "/Users/henso/source/aws-crt-rust/target/debug/build/aws-crt-rust-1e31957a34af6229/out/build/CMakeFiles/CMakeError.log".

--- stderr
CMake Error at /usr/local/Cellar/cmake/3.16.4/share/cmake/Modules/CMakeTestCCompiler.cmake:60 (message):
The C compiler

"/usr/bin/cc"

is not able to compile a simple test program.

It fails with the following output:

Change Dir: /Users/henso/source/aws-crt-rust/target/debug/build/aws-crt-rust-1e31957a34af6229/out/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_25798/fast && /Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/cmTC_25798.dir/build.make CMakeFiles/cmTC_25798.dir/build
Building C object CMakeFiles/cmTC_25798.dir/testCCompiler.c.o
/usr/bin/cc   -ffunction-sections -fdata-sections -fPIC -m64  -arch x86_64 -isysroot macosx   -o CMakeFiles/cmTC_25798.dir/testCCompiler.c.o   -c /Users/henso/source/aws-crt-rust/target/debug/build/aws-crt-rust-1e31957a34af6229/out/build/CMakeFiles/CMakeTmp/testCCompiler.c
clang: warning: no such sysroot directory: 'macosx' [-Wmissing-sysroot]
Linking C executable cmTC_25798
/usr/local/Cellar/cmake/3.16.4/bin/cmake -E cmake_link_script CMakeFiles/cmTC_25798.dir/link.txt --verbose=1
/usr/bin/cc  -ffunction-sections -fdata-sections -fPIC -m64  -arch x86_64 -isysroot macosx -Wl,-search_paths_first -Wl,-headerpad_max_install_names   CMakeFiles/cmTC_25798.dir/testCCompiler.c.o  -o cmTC_25798 
clang: warning: no such sysroot directory: 'macosx' [-Wmissing-sysroot]
ld: library not found for -lSystem
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [cmTC_25798] Error 1
make: *** [cmTC_25798/fast] Error 2

This exact cmake project builds perfectly fine for c and c++.

[JonathanHenson]

fwiw, adding the following line:

aws_common_config.define("CMAKE_OSX_SYSROOT", "PATH=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk");

fixed my build. I pulled that directly from the CMakeCache.txt on the same exact project that was build using vanilla cmake:

cmake <source>

I think the issue is the default value you're adding is incorrect.

[hu55a1n1]

Thanks for the workaround @JonathanHenson... It's working for me as well.

set(CMAKE_OSX_SYSROOT "PATH=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk")

Btw, I wasn't cross compiling either, but I do have two versions of cmake on my system - one installed using brew and the other compiled from sources. Not sure if this has something to do with the issue.

[alexcrichton]

Oh oops I missed that, sorry about that! This looks like it's a regression from #93 unfortunately. I've reverted that so this should be fixed now, sorry for the breakage!

I'll open a follow-up for re-landing.

[Dushistov]

@hu55a1n1 @JonathanHenson

Any opensource repo with which it is possible to reproduce problem?

[JonathanHenson]

Should work for any cmake project. Mine won’t be ready for a little while.

[Dushistov]

@JonathanHenson

Should work for any cmake project

Oh, I should mention this before. I can not reproduce this issue on macOS 10.15.4 with recent XCode.
So I suspect the previous version of XCode/macos 10.14 is part of problem.
But before going via hard way to get machine with 10.14 I want to be sure.

Can you try then this cmake hello world: https://github.com/Dushistov/cmake_rs_hello_world
I explicitly setted revsion for cmake deps to bad via cmake = "=0.1.43".

I can build it for macos and cross-compile for iOS without any issues.

[JonathanHenson]

I think the issue has already been fixed as of a week ago.

[Dushistov]

@JonathanHenson

I think the issue has already been fixed as of a week ago.

From my perspective is was broken a week ago :)
The version 0.1.43 fixes build for iOS and the same time break build for some unknown for me configuration, then "iOS fix" was reverted and version 0.1.44 was released.

So I need find out what is wrong with 0.1.43 to get my iOS build back.

[JonathanHenson]

If you grab GitHub.com/awslabs/aws-c-common and try to build it on 10.14, it should break. I suspect would break regardless of the cmake project though.

[Dushistov]

@JonathanHenson

I updated my test project
https://github.com/Dushistov/cmake_rs_hello_world to include aws-c-common as submodule and it builds without any errors on fresh install of macOS 10.14:

 sw_vers 
ProductName:	Mac OS X
ProductVersion:	10.14.6
BuildVersion:	18G103

Any other hints to reproduce this build problem, please?

what cmake version do you use,
and what with output ls /Library/Developer/CommandLineTools/SDKs,
my show this: "MacOSX.sdk MacOSX10.14.sdk"?