How to force searching LLVM headers, instead of GNU headers?

[jiapei100]

Hi, all:

I've been using Ubuntu 22.04.

I set up CMake for LLVM compilation, as follows:

CMAKE_ADDR2LINE                  /usr/bin/llvm-addr2line
 CMAKE_AR                         /usr/bin/llvm-ar
 CMAKE_ASM_COMPILER               /usr/bin/clang
 CMAKE_ASM_COMPILER_AR            /usr/lib/llvm-14/bin/llvm-ar
 CMAKE_ASM_COMPILER_RANLIB        /usr/lib/llvm-14/bin/llvm-ranlib
.....
CMAKE_CXX_COMPILER               /usr/bin/clang++
 CMAKE_CXX_COMPILER_AR            /usr/bin/llvm-ar-14
 CMAKE_CXX_COMPILER_RANLIB        /usr/bin/llvm-ranlib-14
.....

But, it looks when I

#include <cmath>

, in which

#include <math.h>

, during building, it automatically search for the **GNU header** -

/usr/include/c++/11/math.h

, rather than **LLVM header** -

/usr/lib/llvm-14/include/c++/v1/math.h

.

How can I force to use LLVM's header ONLY?

Thank you

[1fallen]

Did you ever try daphnediane's suggestion: https://discourse.llvm.org/t/how-to-...-headers/64030