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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
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')
-rwxr-xr-xconfigure14
1 files changed, 14 insertions, 0 deletions
diff --git a/configure b/configure
index 17625e1041..6ff252744b 100755
--- a/configure
+++ b/configure
@@ -635,6 +635,8 @@ BISON
 INSTALL_INFO
 PERL
 BASH_SHELL
+CXX_CMATH_HEADER
+CXX_CSTDLIB_HEADER
 CXX_SYSINCLUDES
 SYSINCLUDES
 AUTOCONF
@@ -5054,6 +5056,18 @@ fi
 
 
 
+# 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
+
+
+
 # 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