cmake/modules/BuildRocksDB.cmake: inherit CMAKE_C_COMPILER from parent

if we set the CFLAGS globally, and the CFLAGS contains options
only acceptable by a certain C compiler, RocksDB could fail to
configure. for instance, if we set CXXFLAGS so it contains
`--config /usr/lib/rpm/redhat/redhat-hardened-clang.cfg` and use clang++
as the CMAKE_CXX_COMPILER, while keep CMAKE_C_COMPILER unchanged.
RocksDB would fail to configure like:

```-- Check for working C compiler: /usr/bin/cc - broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/usr/bin/cc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos9/DIST/centos9/MACHINE_SIZE/gigantic/release/19.0.0-1717-g0f726187/rpm/el9/BUILD/ceph-19.0.0-1717-g0f726187/redhat-linux-build/src/rocksdb/CMakeFiles/CMakeScratch/TryCompile-RU5UFV

    Run Build Command(s):/usr/bin/cmake -E env VERBOSE=1 /usr/bin/gmake -f Makefile cmTC_65e36/fast && gmake[3]: Entering directory '/home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos9/DIST/centos9/MACHINE_SIZE/gigantic/release/19.0.0-1717-g0f726187/rpm/el9/BUILD/ceph-19.0.0-1717-g0f726187/redhat-linux-build/src/rocksdb/CMakeFiles/CMakeScratch/TryCompile-RU5UFV'
    /usr/bin/gmake  -f CMakeFiles/cmTC_65e36.dir/build.make CMakeFiles/cmTC_65e36.dir/build
    gmake[4]: Entering directory '/home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos9/DIST/centos9/MACHINE_SIZE/gigantic/release/19.0.0-1717-g0f726187/rpm/el9/BUILD/ceph-19.0.0-1717-g0f726187/redhat-linux-build/src/rocksdb/CMakeFiles/CMakeScratch/TryCompile-RU5UFV'
    Building C object CMakeFiles/cmTC_65e36.dir/testCCompiler.c.o
    /usr/bin/cc   -O2 -flto=thin -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security  -Wp,-D_GLIBCXX_ASSERTIONS --config /usr/lib/rpm/redhat/redhat-hardened-clang.cfg -fstack-protector-strong -m64 -march=x86-64-v2 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  -fPIE -o CMakeFiles/cmTC_65e36.dir/testCCompiler.c.o -c /home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos9/DIST/centos9/MACHINE_SIZE/gigantic/release/19.0.0-1717-g0f726187/rpm/el9/BUILD/ceph-19.0.0-1717-g0f726187/redhat-linux-build/src/rocksdb/CMakeFiles/CMakeScratch/TryCompile-RU5UFV/testCCompiler.c
    cc: error: unrecognized command-line option ‘--config’; did you mean ‘-mpconfig’?
    gmake[4]: *** [CMakeFiles/cmTC_65e36.dir/build.make:78: CMakeFiles/cmTC_65e36.dir/testCCompiler.c.o] Error 1
```

where RocksDB tries to check C compiler -- /usr/bin/cc along with
the said CFLAGS, and fails to compile the test C program, because
GCC does not support this option.

so, in this change, let's pass the CMAKE_C_COMPILER as well.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>
This commit is contained in:
Kefu Chai 2024-03-02 18:02:05 +08:00
parent 8c92912b7d
commit af6bb91505

View File

@ -24,6 +24,7 @@ function(build_rocksdb)
endif()
list(APPEND rocksdb_CMAKE_ARGS -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER})
list(APPEND rocksdb_CMAKE_ARGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER})
list(APPEND rocksdb_CMAKE_ARGS -DWITH_SNAPPY=${SNAPPY_FOUND})
if(SNAPPY_FOUND)