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Make precompiled headers cross buildable.
http://bugs.gentoo.org/show_bug.cgi?id=262912
diff -urN gcc-4.5.0.orig//libstdc++-v3/include/Makefile.am gcc-4.5.0/libstdc++-v3/include/Makefile.am
--- gcc-4.5.0.orig//libstdc++-v3/include/Makefile.am 2010-07-27 11:22:34.000000000 +0200
+++ gcc-4.5.0/libstdc++-v3/include/Makefile.am 2010-07-27 11:21:29.000000000 +0200
@@ -893,7 +893,7 @@
${pch1_output_builddir} ${pch2_output_builddir} ${pch3_output_builddir}
pch_output_anchors = \
${pch1_output_anchor} ${pch2_output_anchor} ${pch3_output_anchor}
-PCHFLAGS=-x c++-header $(CXXFLAGS)
+PCHFLAGS=-x c++-header $(CXXFLAGS) -nostdinc++
if GLIBCXX_BUILD_PCH
pch_build = ${pch_output}
else
diff -urN gcc-4.5.0.orig//libstdc++-v3/include/Makefile.in gcc-4.5.0/libstdc++-v3/include/Makefile.in
--- gcc-4.5.0.orig//libstdc++-v3/include/Makefile.in 2010-04-02 20:18:06.000000000 +0200
+++ gcc-4.5.0/libstdc++-v3/include/Makefile.in 2010-07-27 11:21:47.000000000 +0200
@@ -1119,7 +1119,7 @@
pch_output_anchors = \
${pch1_output_anchor} ${pch2_output_anchor} ${pch3_output_anchor}
-PCHFLAGS = -x c++-header $(CXXFLAGS)
+PCHFLAGS = -x c++-header $(CXXFLAGS) -nostdinc++
@GLIBCXX_BUILD_PCH_FALSE@pch_build =
@GLIBCXX_BUILD_PCH_TRUE@pch_build = ${pch_output}
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