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authorFlorian Weimer <fweimer@redhat.com>2016-09-21 10:45:32 +0200
committerFlorian Weimer <fweimer@redhat.com>2016-09-21 10:45:32 +0200
commitfc3e1337be1c6935ab58bd13520f97a535cf70cc (patch)
tree05a5860b2b10ad95a4ae6b23012a3019d8830f84 /configure.ac
parent612148c6608fb2df34a8d01ccb3b552cd63eb263 (diff)
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Avoid running $(CXX) during build to obtain header file paths
This reduces the build time somewhat and is particularly noticeable during rebuilds with few code changes.
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac12
1 files changed, 12 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 33bcd62..9938ab0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1039,6 +1039,18 @@ fi
AC_SUBST(SYSINCLUDES)
AC_SUBST(CXX_SYSINCLUDES)
+# Obtain some C++ header file paths. This is used to make a local
+# copy of those headers in Makerules.
+if test -n "$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