Make OTP build w/alternative gcc on MacOS Lion

     Requires own build of wxMac for wx to work:

     $ arch_flags="-arch i386"
     $ ./configure CFLAGS="$arch_flags" CXXFLAGS="$arch_flags" \
       CPPFLAGS="$arch_flags" LDFLAGS="$arch_flags" OBJCFLAGS="$arch_flags" \
       OBJCXXFLAGS="$arch_flags" --prefix=/usr/local \
       --with-macosx-sdk=/Developer/SDKs/MacOSX10.6.sdk \
       --with-macosx-version-min=10.6 --enable-unicode --with-opengl
     $ make
     $ sudo make install

     - and we have macports gcc 4.5 in /opt/local/bin, so we configure
     and build OTP like this for 32bit (which is required for wx):

     $ cd $ERL_TOP
     $ PATH=/usr/local/bin:$PATH CC=/opt/local/bin/gcc-mp-4.5 CXX=/opt/local/bin/g++-mp-4.5 ./configure --enable-m32-build
     $ MAKEFLAGS="-j6"  PATH=/usr/local/bin:$PATH make

1 files changed, 14 insertions, 2 deletions

diff --git a/erts/configure.in b/erts/configure.in
index fafa1c7e92..4f0c6efc3e 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -490,7 +490,19 @@ CFLAG_RUNTIME_LIBRARY_PATH="-Wl,-R"
 case $host_os in
   darwin*)
 	CFLAG_RUNTIME_LIBRARY_PATH=
-	CFLAGS="$CFLAGS -no-cpp-precomp"
+	AC_TRY_COMPILE([],[
+		#if __GNUC__ >= 4 
+		;
+		#else
+		#error old or no gcc
+		#endif
+		],
+		gcc_need_no_cpp_precomp=no,
+		gcc_need_no_cpp_precomp=yes)
+
+	if test x$gcc_need_no_cpp_precomp = xyes; then
+	   CFLAGS="$CFLAGS -no-cpp-precomp"
+	fi		   
 	;;
   win32)
 	CFLAG_RUNTIME_LIBRARY_PATH=
@@ -1000,7 +1012,7 @@ case $ERTS_BUILD_SMP_EMU in
 			],
 			gcc_smp=okgcc,
 			gcc_smp=oldornogcc)
-	ERTS_BUILD_SMP_EMU=yes
+Ω	ERTS_BUILD_SMP_EMU=yes
 	case "$enable_threads-$gcc_smp-$found_threads-$host_os" in
 
 	    no-*)