Ubuntu Focal下GNU C++12搭配LLVM16头库编译失败求助

环境信息 #

• 系统：Ubuntu 20.04.6 LTS（focal）
• 编译工具：源码构建的GNU C++编译器v12.2.1
• 依赖：LLVM v16.0.2提供的OpenMP头文件（omp-tools.h）和库文件（libomp.*），LLVM通过Ubuntu额外仓库安装

当前配置与编译命令 #

头文件路径配置 #

通过环境变量指定LLVM头文件路径：

export CPLUS_INCLUDE_PATH=/usr/lib/llvm-16/lib/clang/16/include:$CPLUS_INCLUDE_PATH

GCC编译命令 #

g++ -O3 -fopenmp -I ~/repo/git/smcs3/stan/lib/stan_math -I ~/repo/git/smcs3/stan/lib/stan_math/lib/eigen_3.3.3 -I ~/repo/git/smcs3/stan/lib/stan_math/lib/boost_1.69.0 -shared -fPIC counter.c ompt.c -o libompt.so -lomp

GCC编译错误信息 #

编译失败，返回以下错误：

In file included from /usr/include/stdio.h:33,
                 from counter.h:1,
                 from counter.c:1:
/usr/lib/llvm-16/lib/clang/16/include/stddef.h:41:39: error: missing binary operator before token "("
   41 | #if !defined(_SIZE_T) || __has_feature(modules)
      |                                       ^

In file included from /usr/include/stdio.h:43:
/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:95:3: error: ‘size_t’ does not name a type
   95 |   size_t __pad5;
      |   ^~~~~~
/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:1:1: note: ‘size_t’ is defined in header ‘<cstddef>’; did you forget to ‘#include <cstddef>’?
  +++ |+#include <cstddef>
    1 | /* Copyright (C) 1991-2020 Free Software Foundation, Inc.
/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:98:67: error: ‘size_t’ was not declared in this scope
   98 |   char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
      |                                                                   ^~~~~~
/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:98:67: note: ‘size_t’ is defined in header ‘<cstddef>’; did you forget to ‘#include <cstddef>’?

LLVM编译情况 #

使用clang++-16编译同一代码可成功，但会出现警告：

编译命令 #

clang++-16 -O3 -fopenmp -I ~/repo/git/smcs3/stan/lib/stan_math -I ~/repo/git/smcs3/stan/lib/stan_math/lib/eigen_3.3.3 -I ~/repo/git/smcs3/stan/lib/stan_math/lib/boost_1.69.0 -shared -fPIC counter.c ompt.c -lomp -o libompt.so

警告信息 #

clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]

请求指导解决GCC编译失败的问题。

内容的提问来源于stack exchange，提问作者mabalenk