diff options
| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-11-02 11:55:57 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-11-07 10:40:17 -0300 |
| commit | 596183a1eed0699be96bdcd495ab1b497370afda (patch) | |
| tree | bdf392139f9162cf9bb0c572248d139920d79307 /configure.ac | |
| parent | d1d0162e50afe7fa1e2fc4a901eb411db48acd7b (diff) | |
| download | glibc-596183a1eed0699be96bdcd495ab1b497370afda.tar.gz glibc-596183a1eed0699be96bdcd495ab1b497370afda.tar.xz glibc-596183a1eed0699be96bdcd495ab1b497370afda.zip | |
Rewrite find_cxx_header config configure.ac
With clang if the main file is <stdin>, the first non-main-file dependency is not listed in the -MP output. Although it was fixed on clang-16 [1], this change adds portability for older version. [1] https://github.com/llvm/llvm-project/commit/ff9576f74514b836e1ba0268409a2ecb919d7118 Reviewed-by: Fangrui Song <maskray@google.com>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 9fc1fb1c1c..20b5e8043f 100644 --- a/configure.ac +++ b/configure.ac @@ -1137,8 +1137,8 @@ AC_SUBST(CXX_SYSINCLUDES) # copy of those headers in Makerules. if test -n "$CXX"; then find_cxx_header () { - echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \ - | sed -n "\,$1:,{s/:\$//;p}" + echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \ + | $AWK '$1 == "."{print $2}' } CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" CXX_CMATH_HEADER="$(find_cxx_header cmath)" |