tools.build:compiler_executables breaks build with Autotools and Xcode

[Nekto89]

git clone https://github.com/Nekto89/cmake-conan.git -b bug/xcode_compiler_location
cmake -GXcode -DCMAKE_CONFIGURATION_TYPES=Release -DCMAKE_PROJECT_TOP_LEVEL_INCLUDES=../conan_provider.cmake -B build -S cmake-conan/example

Click to expand log

-- The C compiler identification is AppleClang 14.0.0.14000029
-- The CXX compiler identification is AppleClang 14.0.0.14000029
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- CMake-Conan: first find_package() found. Installing dependencies with Conan
-- CMake-Conan: Checking if a default profile exists
/Users/mklymov/.conan2/profiles/default
-- CMake-Conan: cmake_system_name=Darwin
-- CMake-Conan: cmake_osx_deployment_target=
-- CMake-Conan: cmake_system_processor=armv8
-- CMake-Conan: CMake compiler=AppleClang
-- CMake-Conan: CMake compiler version=14.0.0.14000029
-- CMake-Conan: [settings] compiler=apple-clang
-- CMake-Conan: [settings] compiler.version=14
-- CMake-Conan: Creating profile /Users/mklymov/test/build/conan_host_profile
-- CMake-Conan: Profile:
[settings]
arch=armv8
os=Macos
compiler=apple-clang
compiler.version=14
compiler.cppstd=14
compiler.libcxx=libc++
[conf]
tools.cmake.cmaketoolchain:generator=Xcode
tools.build:compiler_executables={"c":"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang","cpp":"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++"}

CMake Warning at /Users/mklymov/test/cmake-conan/conan_provider.cmake:531 (message):
  Cmake-conan: CMakeDeps generator was not defined in the conanfile.  Please
  define the generator as it will be mandatory in the future
Call Stack (most recent call first):
  CMakeLists.txt:7 (find_package)


-- CMake-Conan: Installing both Debug and Release
-- CMake-Conan: conan install /Users/mklymov/test/cmake-conan/example -of=/Users/mklymov/test/build/conan --profile:host=default;--profile:host=/Users/mklymov/test/build/conan_host_profile;--profile:build=default;-s;build_type=Release;--build=missing;-g;CMakeDeps

======== Input profiles ========
Profile host:
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.cppstd=14
compiler.libcxx=libc++
compiler.version=14
os=Macos
[conf]
tools.build:compiler_executables={'c': '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang', 'cpp': '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++'}
tools.cmake.cmaketoolchain:generator=Xcode

Profile build:
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.cppstd=gnu17
compiler.libcxx=libc++
compiler.version=14
os=Macos


======== Computing dependency graph ========
Graph root
    conanfile.txt: /Users/mklymov/test/cmake-conan/example/conanfile.txt
Requirements
    icu/71.1#fa0837c81e75f43c054bc31d28b272bd - Cache

======== Computing necessary packages ========
icu/71.1: Checking 11 compatible configurations
icu/71.1: Main binary package '5e175a889e1c1ac8097f8563a63c9423b4f55411' missing. Using compatible package '1a6a1e4d73470a79e619194c99dfb00bdb04c50b': compiler.cppstd=17
Requirements
    icu/71.1#fa0837c81e75f43c054bc31d28b272bd:1a6a1e4d73470a79e619194c99dfb00bdb04c50b#4964e826a60cc34055c5bfe563c275f1 - Cache

======== Installing packages ========
icu/71.1: Already installed! (1 of 1)
WARN: deprecated: Usage of deprecated Conan 1.X features that will be removed in Conan 2.X:
WARN: deprecated:     'cpp_info.names' used in: icu/71.1
WARN: deprecated:     'env_info' used in: icu/71.1

======== Finalizing install (deploy, generators) ========
conanfile.txt: Writing generators to /Users/mklymov/test/build/conan/build/generators
conanfile.txt: Generator 'CMakeDeps' calling 'generate()'
conanfile.txt: CMakeDeps necessary find_package() and targets for your CMakeLists.txt
    find_package(ICU)
    target_link_libraries(... icu::icu)
conanfile.txt: Generating aggregated env files
conanfile.txt: Generated aggregated env files: ['conanbuild.sh', 'conanrun.sh']
Install finished successfully
-- CMake-Conan: CONAN_GENERATORS_FOLDER=/Users/mklymov/test/build/conan/build/generators
-- CMake-Conan: CONANFILE=/Users/mklymov/test/cmake-conan/example/conanfile.txt
-- CMake-Conan: conan install /Users/mklymov/test/cmake-conan/example -of=/Users/mklymov/test/build/conan --profile:host=default;--profile:host=/Users/mklymov/test/build/conan_host_profile;--profile:build=default;-s;build_type=Debug;--build=missing;-g;CMakeDeps

======== Input profiles ========
Profile host:
[settings]
arch=armv8
build_type=Debug
compiler=apple-clang
compiler.cppstd=14
compiler.libcxx=libc++
compiler.version=14
os=Macos
[conf]
tools.build:compiler_executables={'c': '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang', 'cpp': '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++'}
tools.cmake.cmaketoolchain:generator=Xcode

Profile build:
[settings]
arch=armv8
build_type=Release
compiler=apple-clang
compiler.cppstd=gnu17
compiler.libcxx=libc++
compiler.version=14
os=Macos


======== Computing dependency graph ========
Graph root
    conanfile.txt: /Users/mklymov/test/cmake-conan/example/conanfile.txt
Requirements
    icu/71.1#fa0837c81e75f43c054bc31d28b272bd - Cache

======== Computing necessary packages ========
icu/71.1: Checking 11 compatible configurations
icu/71.1: Compatible configurations not found in cache, checking servers
icu/71.1: 'de89b97ad61d78d0306b73365a5484cf0cb5bf7c': compiler.cppstd=98
icu/71.1: '1c5e732a6b108e33d8d90cc24a0147f54e169d4a': compiler.cppstd=gnu98
icu/71.1: '74f3c1c1e529be34ec7a8cebf08a9b13da9c1875': compiler.cppstd=11
icu/71.1: '6348eb97c08cd8e89c6b8038e4da51d2573de809': compiler.cppstd=gnu11
icu/71.1: '663fb33f1e442aa89d6a3f4ea84985cbde244039': compiler.cppstd=gnu14
icu/71.1: '7838046809bc321d088d4e46cc55922c25014260': compiler.cppstd=17
icu/71.1: '291a0944e3ac2b9f14c6f3c9302d5c87ad5e5da1': compiler.cppstd=gnu17
icu/71.1: '0e373f1e8a3a02fb1cce860ef549f1f75aa420a5': compiler.cppstd=20
icu/71.1: '46e9408cd6b52154e6cd854cac94867450b3cd87': compiler.cppstd=gnu20
icu/71.1: '8c553ef36f5f2dcdfcbdc0f8136a657e97e2313d': compiler.cppstd=23
icu/71.1: 'af183789b52feef149b556c0534abbf8eecbdcba': compiler.cppstd=gnu23
Requirements
    icu/71.1#fa0837c81e75f43c054bc31d28b272bd:b4ce41c723ecbd444ee714da4099f9c6747e9cdb - Build

======== Installing packages ========

-------- Installing package icu/71.1 (1 of 1) --------
icu/71.1: Building from source
icu/71.1: Package icu/71.1:b4ce41c723ecbd444ee714da4099f9c6747e9cdb
icu/71.1: Copying sources to build folder
icu/71.1: Building your package in /Users/mklymov/.conan2/p/b/icudebc37755934f/b
icu/71.1: Calling generate()
icu/71.1: Generators folder: /Users/mklymov/.conan2/p/b/icudebc37755934f/b/build-debug/conan
icu/71.1: Generating aggregated env files
icu/71.1: Generated aggregated env files: ['conanbuild.sh', 'conanrun.sh']
icu/71.1: Calling build()
icu/71.1: Apply patch (file): patches/0001-69.1-fix-mingw.patch
icu/71.1: Apply patch (file): patches/0001-71.1-fix-undef-strict-ansi.patch
icu/71.1: Apply patch (portability): Add config file for wasm-emscripten platform
icu/71.1: Calling:
 > "/Users/mklymov/.conan2/p/b/icudebc37755934f/b/src/source/configure" --disable-shared --enable-static --prefix=/ '--bindir=${prefix}/bin' '--sbindir=${prefix}/bin' '--libdir=${prefix}/lib' '--includedir=${prefix}/include' '--oldincludedir=${prefix}/include' '--datarootdir=${prefix}/lib' --enable-release=no --enable-debug=yes --enable-dyload=yes --enable-extras=no --enable-icuio=yes --disable-layoutex --disable-layout --enable-tools=yes --enable-tests=no --disable-samples --with-library-bits=64 --with-data-packaging=archive
icu/71.1: RUN: "/Users/mklymov/.conan2/p/b/icudebc37755934f/b/src/source/configure" --disable-shared --enable-static --prefix=/ '--bindir=${prefix}/bin' '--sbindir=${prefix}/bin' '--libdir=${prefix}/lib' '--includedir=${prefix}/include' '--oldincludedir=${prefix}/include' '--datarootdir=${prefix}/lib' --enable-release=no --enable-debug=yes --enable-dyload=yes --enable-extras=no --enable-icuio=yes --disable-layoutex --disable-layout --enable-tools=yes --enable-tests=no --disable-samples --with-library-bits=64 --with-data-packaging=archive
checking for ICU version numbers... release 71.1, library 71.1, unicode version 14.0
checking build system type... arm-apple-darwin22.6.0
checking host system type... arm-apple-darwin22.6.0
checking whether to build debug libraries... yes
checking whether to build release libraries... no
checking whether the C compiler works... no
configure: error: in `/Users/mklymov/.conan2/p/b/icudebc37755934f/b/build-debug':
configure: error: C compiler cannot create executables
See `config.log' for more details

icu/71.1: ERROR:
Package 'b4ce41c723ecbd444ee714da4099f9c6747e9cdb' build failed
icu/71.1: WARN: Build folder /Users/mklymov/.conan2/p/b/icudebc37755934f/b/build-debug
ERROR: icu/71.1: Error in build() method, line 204
        autotools.configure(build_script_folder=os.path.join(self.source_folder, "source"))
        ConanException: Error 77 while executing
CMake Error at /Users/mklymov/test/cmake-conan/conan_provider.cmake:432 (message):
  Conan install failed='1'
Call Stack (most recent call first):
  /Users/mklymov/test/cmake-conan/conan_provider.cmake:543 (conan_install)
  CMakeLists.txt:7 (find_package)


-- Configuring incomplete, errors occurred!
See also "/Users/mklymov/test/build/CMakeFiles/CMakeOutput.log".

Probably the same problem as in #589 but in my case CMake uses different name of executable.

Is this a problem with cmake-conan or with ICU recipe? conan-io/conan-center-index#22624

[jcar87]

Hi @Nekto89 - thank you for reporting this.

Interesting, I can see why this is failing - I'm surprised that cmake is reporting clang and clang++ as the compilers, instead of cc and c++, which is (or used to be) the default behaviour.

What version of CMake are you using?

[Nekto89]

Hi @Nekto89 - thank you for reporting this.

Interesting, I can see why this is failing - I'm surprised that cmake is reporting clang and clang++ as the compilers, instead of cc and c++, which is (or used to be) the default behaviour.

What version of CMake are you using?

cmake version 3.25.1

[jcar87]

I'm unable to reproduce this:

• CMake 3.25.1
• Xcode 14.1

A project like this:

cmake_minimum_required(VERSION 3.25)

project(foobar LANGUAGES C CXX)

CMake will report:

-- The C compiler identification is AppleClang 14.0.0.14000029
-- The CXX compiler identification is AppleClang 14.0.0.14000029
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode_14.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode_14.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done

The cc and c++ being detected is what should cause the current logic to do the right thing. Wondering what causes yours to report clang and clang++. Any chance you have set CC/CXX environment variables or similar?
Oh, perhaps it's the use of -GXcode that causes this! I'll have a look

Can reproduce this now with -GXcode - fix incoming!