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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] Rewrite find_cxx_header config configure.ac Date: Mon, 7 Nov 2022 13:40:59 +0000 (GMT) [thread overview] Message-ID: <20221107134059.E5D4E385AC2C@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=596183a1eed0699be96bdcd495ab1b497370afda commit 596183a1eed0699be96bdcd495ab1b497370afda Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Wed Nov 2 11:55:57 2022 -0300 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> Diff: --- configure | 4 ++-- configure.ac | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/configure b/configure index fc3d7842de..cb0996d59e 100755 --- a/configure +++ b/configure @@ -5669,8 +5669,8 @@ fi # 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="$(find_cxx_header cmath)" diff --git a/configure.ac b/configure.ac index 9fc1fb1c1c..20b5e8043f 100644 --- a/configure.ac +++ b/configure.ac @@ -1137,8 +1137,8 @@ AC_SUBST(CXX_SYSINCLUDES) # copy of those headers in Makerules. if test -n "$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)"
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