CMakeLists.txt: add C language to project statement (#813)
This will fix the detection of atomic: -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB - Failed -- Looking for __atomic_load_8 in atomic -- Looking for __atomic_load_8 in atomic - not found CMake Error at CMakeModules/CheckAtomic.cmake:76 (message): Host compiler appears to require libatomic for 64-bit operations, but cannot find it. Call Stack (most recent call first): CMakeLists.txt:19 (include) Indeed if C language is not enabled, the test will be run with the C++ compiler resulting in the following error: Building CXX object CMakeFiles/cmTC_fad22.dir/CheckFunctionExists.cxx.o /tmp/instance-0/output-1/host/bin/mipsel-linux-g++ --sysroot=/tmp/instance-0/output-1/host/mipsel-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -D_FORTIFY_SOURCE=1 -Wall -Wconversion -pedantic -Wextra -Wno-missing-field-initializers -DCHECK_FUNCTION_EXISTS=__atomic_load_8 -DNDEBUG -o CMakeFiles/cmTC_fad22.dir/CheckFunctionExists.cxx.o -c /tmp/instance-0/output-1/build/pistache-f2f5a50f/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx <command-line>: error: new declaration 'char __atomic_load_8()' ambiguates built-in declaration 'long long unsigned int __atomic_load_8(const volatile void*, int)' [-fpermissive] /tmp/instance-0/output-1/build/pistache-f2f5a50f/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx:7:3: note: in expansion of macro 'CHECK_FUNCTION_EXISTS' CHECK_FUNCTION_EXISTS(void); ^~~~~~~~~~~~~~~~~~~~~ /tmp/instance-0/output-1/build/pistache-f2f5a50f/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx: In function 'int main(int, char**)': /tmp/instance-0/output-1/build/pistache-f2f5a50f/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx:17:25: error: too few arguments to function 'long long unsigned int __atomic_load_8(const volatile void*, int)' CHECK_FUNCTION_EXISTS(); ^ whereas with a C compiler, we'll get: Building C object CMakeFiles/cmTC_4b0f4.dir/CheckFunctionExists.c.o /home/fabrice/buildroot/output/host/bin/riscv32-linux-gcc --sysroot=/home/fabrice/buildroot/output/host/riscv32-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=__atomic_load_8 -DNDEBUG -o CMakeFiles/cmTC_4b0f4.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.16/Modules/CheckFunctionExists.c <command-line>: warning: conflicting types for built-in function ‘__atomic_load_8’ [-Wbuiltin-declaration-mismatch] /usr/share/cmake-3.16/Modules/CheckFunctionExists.c:7:3: note: in expansion of macro ‘CHECK_FUNCTION_EXISTS’ CHECK_FUNCTION_EXISTS(void); ^~~~~~~~~~~~~~~~~~~~~ Linking C executable cmTC_4b0f4 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4b0f4.dir/link.txt --verbose=1 /home/fabrice/buildroot/output/host/bin/riscv32-linux-gcc --sysroot=/home/fabrice/buildroot/output/host/riscv32-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=__atomic_load_8 -DNDEBUG CMakeFiles/cmTC_4b0f4.dir/CheckFunctionExists.c.o -o cmTC_4b0f4 -latomic Fixes: - http://autobuild.buildroot.org/results/2bf06c6a9e55b449ec5875cf9415a9e55b2065d6Signed-off-by:Fabrice Fontaine <fontaine.fabrice@gmail.com>
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