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, 76 insertions, 2 deletions

diff --git a/lib/wx/configure.in b/lib/wx/configure.in
index f7128db23a..78c3f0d3d2 100755
--- a/lib/wx/configure.in
+++ b/lib/wx/configure.in
@@ -138,10 +138,65 @@ esac
 
 PTHR_CFLAGS="-D_THREAD_SAFE -D_REENTRANT"
 
+OBJC_CC=$CC
+OBJC_CFLAGS=""
+
 dnl NOTE: CPPFLAGS will be included in CFLAGS at the end
 case $host_os in
     darwin*)
-        C_ONLY_FLAGS="-ObjC"
+	AC_MSG_CHECKING([if compiler accepts -ObjC])
+	saved_CFLAGS=$CFLAGS
+  	CFLAGS="$CFLAGS -ObjC"
+  	AC_TRY_COMPILE([],[;], accept_objc_flag=true, accept_objc_flag=false)
+  	if test "X$accept_objc_flag" = "Xtrue"; then
+	   AC_MSG_RESULT([yes])
+           C_ONLY_FLAGS="-ObjC"
+	else
+	   dnl We are probebly trying to build with a non-Apple gcc,
+	   dnl which is good as long as we do not try to build Cocoa
+	   dnl code. We need an Apple compiler for just that (Objective C)
+	   AC_MSG_RESULT([no])
+	   AC_MSG_CHECKING([for a Cocoa compliant Objective C compiler])
+	   SEARCHFOR=""
+	   save_IFS=$IFS
+	   IFS=:
+	   set $PATH
+	   IFS=$save_IFS
+	   while test X"$1" != X""; do
+	       dnl Add all possible paths to a real apple gcc
+	       SEARCHFOR="$1/gcc-apple-4.2 $SEARCHFOR"
+	       shift
+	   done
+	   dnl Add LLVM compilers, they will work in this case
+	   SEARCHFOR="/usr/bin/clang /usr/bin/gcc $SEARCHFOR"	
+	   APPLE_CC=""
+	   dnl SEARCHFOR is reversed, so we want to find the last existing
+	   dnl executable in the list
+	   for x in $SEARCHFOR; do
+	       if test -x $x; then
+	       	  APPLE_CC=$x
+	       fi
+	   done	
+	   if test X$APPLE_CC = X; then
+	      AC_MSG_RESULT([no])
+	      dnl Complete failure, we cannot build Cocoa code
+	      if test X"$WX_BUILDING_INSIDE_ERLSRC" != X"true" ; then
+		AC_MSG_ERROR([Can not find compiler to compile Cocoa applications])
+	      else
+		echo "Can not find compiler to compile Cocoa applications" > ./CONF_INFO
+		WXERL_CAN_BUILD_DRIVER=false
+		AC_MSG_WARN([Can not find compiler to compile Cocoa applications])
+	      fi
+	      WXERL_CAN_BUILD_DRIVER=false
+	   else
+	      dnl We think we found an Apple compiler and will add 
+	      dnl Apple specific options
+	      AC_MSG_RESULT($APPLE_CC)
+	      OBJC_CC=$APPLE_CC
+	      OBJC_CFLAGS="-ObjC"
+	   fi
+  	fi
+  	CFLAGS=$saved_CFLAGS
 	CPPFLAGS="$CPPFLAGS -D_MACOSX $PTHR_CFLAGS"
 	;;
     mingw32)
@@ -159,10 +214,29 @@ case $host_os in
 	;;
 esac
 
+AC_SUBST(OBJC_CC)
+AC_SUBST(OBJC_CFLAGS)
+
 case $host_os in
     darwin*)
-	CFLAGS="-no-cpp-precomp $CFLAGS"
+	AC_TRY_COMPILE([],[
+		#if __GNUC__ >= 4 
+		;
+		#else
+		#error old or no gcc
+		#endif
+		],
+		gcc_need_no_cpp_precomp=no,
+		gcc_need_no_cpp_precomp=yes)
+
+	if test x$gcc_need_no_cpp_precomp = xyes; then
+	   CFLAGS="-no-cpp-precomp $CFLAGS"
+	fi
 	LDFLAGS="-bundle -flat_namespace -undefined warning -fPIC $LDFLAGS"
+	# Check sizof_void_p as future will hold 64bit MacOS wx
+	if test $ac_cv_sizeof_void_p = 4; then
+	    LDFLAGS="-m32 $LDFLAGS"
+	fi		   
 	GL_LIBS="-framework OpenGL"
 	;;
     win32)