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[question] How to disable warnings from headers from dependencies

See original GitHub issue

I am using some dependency packages in my project and their headers generate a lot of warnings when compiling with my code. Is there a way to mark the dependencies’ headers as system headers similar to gcc’s -isystem flag? So that the warnings will be ignored.

Issue Analytics

State:
Created 3 years ago
Comments:6 (4 by maintainers)

Top GitHub Comments

1reaction

solvingjcommented, Feb 24, 2021

Ah, yes, the lack of docs is a problem. here’s this.

https://github.com/conan-io/docs/issues/601

So, I guess that the easiest thing that you might be able to do is mentioned here by @uilianries

https://github.com/bincrafters/community/issues/1100#issuecomment-604997132

set(CONAN_SYSTEM_INCLUDES ON)

But, I think the issue with this is that it only works for globals. If you’re using Conan via find_package and targets , I don’t think it works. Is that right @uilianries ?

0reactions

uilianriescommented, Mar 3, 2021

Hi @kakashidinho that’s first time I see it. Actually, the default behavior for me, when using Conan, is with -isystem for cmake generator. As example, let’s use gtest recipe when building its test package:

gtest/1.10.0 (test package): Calling build()

----Running------
> cd '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release" -DCONAN_IN_LOCAL_CACHE="OFF" -DCONAN_COMPILER="gcc" -DCONAN_COMPILER_VERSION="9" -DCONAN_CXX_FLAGS="-m64" -DCONAN_SHARED_LINKER_FLAGS="-m64" -DCONAN_C_FLAGS="-m64" -DCONAN_LIBCXX="libstdc++" -DCMAKE_MODULE_PATH="/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -DWITH_GMOCK="True" -DWITH_MAIN="True" -Wno-dev '/home/conan/project/test_package'
-----------------
-- The CXX compiler identification is GNU 9.2.1
-- Check for working CXX compiler: /usr/bin/g++
-- Check for working CXX compiler: /usr/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: called by CMake conan helper
-- Conan: Adjusting output directories
-- Conan: Using cmake global configuration
-- Conan: Adjusting default RPATHs Conan policies
-- Conan: Adjusting language standard
-- Conan: Compiler GCC>=5, checking major version 9
-- Conan: Checking correct version: 9
-- Conan: C++ stdlib: libstdc++
CMake Warning at CMakeLists.txt:30 (message):
  CONAN_SYSTEM_INCLUDES:


CMake Warning at CMakeLists.txt:31 (message):
  CONAN_C_FLAGS: -m64


-- Conan: Using autogenerated FindGTest.cmake
-- Found GTest: 1.10.0 (found version "1.10.0") 
-- Library gtest_main found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest_main.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest_main.a
-- Library gmock_main found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock_main.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock_main.a
-- Library gmock found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock.a
-- Library gtest found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest.a
-- Library gtest found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest.a
-- Library gmock found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock.a
-- Library gmock_main found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock_main.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock_main.a
-- Library gtest_main found /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest_main.a
-- Found: /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest_main.a
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


-- Build files have been written to: /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f

----Running------
> cmake --build '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f' '--' '-j4'
-----------------
/usr/bin/cmake -S/home/conan/project/test_package -B/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f/CMakeFiles /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f/CMakeFiles/progress.marks
/usr/bin/make -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
/usr/bin/make -f CMakeFiles/test_package.dir/build.make CMakeFiles/test_package.dir/depend
make[2]: Entering directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
cd /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/conan/project/test_package /home/conan/project/test_package /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f/CMakeFiles/test_package.dir/DependInfo.cmake --color=
Scanning dependencies of target test_package
make[2]: Leaving directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
/usr/bin/make -f CMakeFiles/test_package.dir/build.make CMakeFiles/test_package.dir/build
make[2]: Entering directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
[ 50%] Building CXX object CMakeFiles/test_package.dir/test_package.cpp.o
/usr/bin/g++  -DWITH_GMOCK -D_GLIBCXX_USE_CXX11_ABI=0 -isystem /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/include  -m64 -O3 -DNDEBUG    -std=gnu++11 -o CMakeFiles/test_package.dir/test_package.cpp.o -c /home/conan/project/test_package/test_package.cpp
[100%] Linking CXX executable bin/test_package
/usr/bin/cmake -E cmake_link_script CMakeFiles/test_package.dir/link.txt --verbose=1
/usr/bin/g++    -m64 -O3 -DNDEBUG        -rdynamic CMakeFiles/test_package.dir/test_package.cpp.o  -o bin/test_package   -L/home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib  -Wl,-rpath,/home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest_main.a /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock_main.a /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgmock.a /home/conan/.conan/data/gtest/1.10.0/_/_/package/71c983c52942eb4756e4bd60e4cbec9fd7557e5d/lib/libgtest.a -lpthread 
make[2]: Leaving directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
[100%] Built target test_package
make[1]: Leaving directory '/home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f'
/usr/bin/cmake -E cmake_progress_start /home/conan/project/test_package/build/7e3f3c9f8b0319ca5c01315759aeda2f877da74f/CMakeFiles 0
gtest/1.10.0 (test package): Running test()

As you can see, CONAN_SYSTEM_INCLUDE is not enabled, but still Conan uses -isystem for GTest include folder. I have no sure how, but my guess some other flags affect CMake behavior.

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