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| author |   Florian Weimer <fweimer@redhat.com> | 2016-09-21 10:45:32 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2016-09-21 10:45:32 +0200 |
| commit | fc3e1337be1c6935ab58bd13520f97a535cf70cc (patch) | |
| tree | 05a5860b2b10ad95a4ae6b23012a3019d8830f84 /configure.ac | |
| parent | Generate .op pattern rules for profiling builds only (diff) | |
| download | glibc-fc3e1337be1c6935ab58bd13520f97a535cf70cc.tar.gz glibc-fc3e1337be1c6935ab58bd13520f97a535cf70cc.tar.bz2 glibc-fc3e1337be1c6935ab58bd13520f97a535cf70cc.zip | |
Avoid running $(CXX) during build to obtain header file paths
This reduces the build time somewhat and is particularly noticeable
during rebuilds with few code changes.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 33bcd62180..9938ab0dc2 100644 --- a/configure.ac +++ b/configure.ac @@ -1039,6 +1039,18 @@ fi AC_SUBST(SYSINCLUDES) AC_SUBST(CXX_SYSINCLUDES) +# Obtain some C++ header file paths. This is used to make a local +# copy of those headers in Makerules. +if test -n "$CXX"; then + find_cxx_header () { + echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}" + } + CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" + CXX_CMATH_HEADER="$(find_cxx_header cmath)" +fi +AC_SUBST(CXX_CSTDLIB_HEADER) +AC_SUBST(CXX_CMATH_HEADER) + # Test if LD_LIBRARY_PATH contains the notation for the current directory # since this would lead to problems installing/building glibc. # LD_LIBRARY_PATH contains the current directory if one of the following |