From 6706074627da7734d21f0024b6f7fb58b5629d6b Mon Sep 17 00:00:00 2001
From: Adam Conrad <adconrad@0c3.net>
Date: Sat, 24 Nov 2012 23:58:38 -0700
Subject: [PATCH] Fix C++ header directory detection for non-standard paths.

Stop assuming specific path layouts for C++ headers, and instead
use an autodetection method that looks for paths with '/[cg]++'
in the g++ include list.
---
 ChangeLog    |  5 +++++
 configure    | 11 +++++------
 configure.in | 11 +++++------
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b4f6e0686c..bca890ac38 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-24  Adam Conrad  <adconrad@0c3.net>
+
+	* configure.in: Autodetect C++ header directories.
+	* configure: Regenerated.
+
 2012-11-23  Mike Frysinger  <vapier@gentoo.org>
 
 	* elf/Makefile ($(objpfx)ld.so): Change readelf to $(READELF).
diff --git a/configure b/configure
index ff2d34ca9c..8799b7de78 100755
--- a/configure
+++ b/configure
@@ -5423,12 +5423,11 @@ if test -n "$sysheaders"; then
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
     CXX_SYSINCLUDES=
-    cxxmachine=`$CXX -dumpmachine 2>&5` &&
-    cxxheaders=`$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
-	| sed -n -e '1,/#include/d' -e '/^ \//{p;q;}' | sed 's/ //'`
-    test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
-    CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
--isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
+    for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
+    | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
+      test "x$cxxheaders" != x &&
+      CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
+    done
   fi
 fi
 
diff --git a/configure.in b/configure.in
index a7f7198818..d369382264 100644
--- a/configure.in
+++ b/configure.in
@@ -995,12 +995,11 @@ if test -n "$sysheaders"; then
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
     CXX_SYSINCLUDES=
-    cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
-    cxxheaders=`$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
-	| sed -n -e '1,/#include/d' -e '/^ \//{p;q;}' | sed 's/ //'`
-    test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
-    CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
--isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
+    for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
+    | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
+      test "x$cxxheaders" != x &&
+      CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
+    done
   fi
 fi
 AC_SUBST(SYSINCLUDES)