summary refs log tree commit diff
path: root/configure.ac
diff options
context:
space:
mode:
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)
downloadglibc-fc3e1337be1c6935ab58bd13520f97a535cf70cc.tar.gz
glibc-fc3e1337be1c6935ab58bd13520f97a535cf70cc.tar.xz
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.ac12
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