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When cross compiling a target gcc, target flags may be used on the host
Configure identifies a number of warning flags (WARN_CFLAGS and
WARN_CXXFLAGS) from the $CC value. The cross compiler may be different
from the host compiler and may not support the same set of flags. This
leads to problems such as:
cc1plus: error: unrecognized command line option "-Wno-narrowing"
cc1plus: error: unrecognized command line option "-Wno-overlength-strings"
Work around this problem by removing the warning flags from the
BUILD_*FLAGS values.
Upstream-Status: Pending
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
diff -ur gcc-4.8.0.orig/gcc/configure.ac gcc-4.8.0/gcc/configure.ac
--- gcc-4.8.0.orig/gcc/configure.ac 2013-05-29 14:44:24.960853593 -0500
+++ gcc-4.8.0/gcc/configure.ac 2013-05-31 01:34:09.518775962 -0500
@@ -1892,8 +1892,8 @@
# These are the normal (build=host) settings:
CC_FOR_BUILD='$(CC)' AC_SUBST(CC_FOR_BUILD)
CXX_FOR_BUILD='$(CXX)' AC_SUBST(CXX_FOR_BUILD)
-BUILD_CFLAGS='$(ALL_CFLAGS)' AC_SUBST(BUILD_CFLAGS)
-BUILD_CXXFLAGS='$(ALL_CXXFLAGS)' AC_SUBST(BUILD_CXXFLAGS)
+BUILD_CFLAGS='$(ALL_BUILD_CFLAGS)' AC_SUBST(BUILD_CFLAGS)
+BUILD_CXXFLAGS='$(ALL_BUILD_CXXFLAGS)' AC_SUBST(BUILD_CXXFLAGS)
BUILD_LDFLAGS='$(LDFLAGS)' AC_SUBST(BUILD_LDFLAGS)
STMP_FIXINC=stmp-fixinc AC_SUBST(STMP_FIXINC)
diff -ur gcc-4.8.0.orig/gcc/Makefile.in gcc-4.8.0/gcc/Makefile.in
--- gcc-4.8.0.orig/gcc/Makefile.in 2013-05-29 14:44:24.369853593 -0500
+++ gcc-4.8.0/gcc/Makefile.in 2013-05-31 01:34:30.360776427 -0500
@@ -989,10 +989,16 @@
ALL_CFLAGS = $(T_CFLAGS) $(CFLAGS-$@) \
$(CFLAGS) $(INTERNAL_CFLAGS) $(COVERAGE_FLAGS) $(WARN_CFLAGS) @DEFS@
+ALL_BUILD_CFLAGS = $(T_CFLAGS) $(CFLAGS-$@) \
+ $(CFLAGS) $(INTERNAL_CFLAGS) @DEFS@
+
# The C++ version.
ALL_CXXFLAGS = $(T_CFLAGS) $(CFLAGS-$@) $(CXXFLAGS) $(INTERNAL_CFLAGS) \
$(COVERAGE_FLAGS) $(NOEXCEPTION_FLAGS) $(WARN_CXXFLAGS) @DEFS@
+ALL_BUILD_CXXFLAGS = $(T_CFLAGS) $(CFLAGS-$@) $(CXXFLAGS) $(INTERNAL_CFLAGS) \
+ $(NOEXCEPTION_FLAGS) @DEFS@
+
# Likewise. Put INCLUDES at the beginning: this way, if some autoconf macro
# puts -I options in CPPFLAGS, our include files in the srcdir will always
# win against random include files in /usr/include.
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