Support for custom gcc paths

[Liunus]

After installing devtoolset-7-gcc to /opt/rh/devtoolset-7/, failed when compiling:

thirdparty/installed//include/boost/config/select_stdlib_config.hpp:18:12: fatal error: 'cstddef' file not found # include <cstddef>

So maybe need to better support thirdparty libraries and build toolchains.

[chalsliu]

cd /home/user/doris/be/build/src/codegen && /home/user/doris/thirdparty/installed/llvm/bin/clang++ -gcc-toolchain /opt/rh/devtoolset-7/root/usr -std=c++11 -c -emit-llvm -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DIR_COMPILE -DNDEBUG -DHAVE_INTTYPES_H -DHAVE_NETINET_IN_H -DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -D__GLIBCXX_BITSIZE_INT_N_0=128 -D__GLIBCXX_TYPE_INT_N_0=__int128 -U_GLIBCXX_USE_FLOAT128 -DLLVM_ON_UNIX -I/home/user/doris/thirdparty/installed//llvm/include -I/home/user/doris/be/src -I/home/user/doris/be/../gensrc/build/ -I/home/user/doris/thirdparty/installed//include -I/home/user/doris/thirdparty/installed//include/thrift/ -I/home/user/doris/thirdparty/installed//include/event/ -I/home/user/doris/thirdparty/installed//gperftools/include -I/opt/rh/devtoolset-7/root/usr/include /home/user/doris/be/src/codegen/doris_ir.cpp -o /home/user/doris/be/../gensrc/build//doris_ir/doris_no_sse_tmp.bc

This step caused the error because the header file could not be found.

[chalsliu]

solution:
Locate the location of the header files and add them to the CPLUS_INCLUDE_PATH environment variable.

[imay]

what path should be added to CPLUS_INCLUDE_PATH??

[chalsliu]

what path should be added to CPLUS_INCLUDE_PATH??

The correct header file path of custom GCC, by default, clang can't find them.
So it should be set explicitly.

[imay]

what path should be added to CPLUS_INCLUDE_PATH??

The correct header file path of custom GCC, by default, clang can't find them.
So it should be set explicitly.

With -gcc-toolchain, LLVM should find gcc's path. And what's in your ${GCCHOME}/lib/gcc/ directory?

[chalsliu]

what path should be added to CPLUS_INCLUDE_PATH??

The correct header file path of custom GCC, by default, clang can't find them.
So it should be set explicitly.

With -gcc-toolchain, LLVM should find gcc's path. And what's in your ${GCCHOME}/lib/gcc/ directory?

/opt/rh/devtoolset-7/root/usr/bin/gcc on my server.

[imay]

What is in /opt/rh/devtoolset-7/root/usr/bin/gcc/lib/gcc

[chalsliu]

What is in /opt/rh/devtoolset-7/root/usr/bin/gcc/lib/gcc

/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/

[imay]

/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/

Could you reinstall gcc with three bit version x86_64-redhat-linux/7.3.0 other than x86_64-redhat-linux/7?

[chalsliu]

/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/

Could you reinstall gcc with three bit version x86_64-redhat-linux/7.3.0 other than x86_64-redhat-linux/7?

After install gcc in this way,

sudo yum install centos-release-scl
sudo yum install devtoolset-7-gcc*

There is only one version number by default.

[chalsliu]

Another solution:

1. Find default header file paths of DORIS_GCC_HOME and set as enviroment variable CLANG_COMPATIBLE_FLAGS.
2. Explicitly add these paths to CLANG_INCLUDE_FLAGS in be/CMakeLists.txt