contrib: prevent some rare linking errors on OSX by providing the minimal OS...

contrib: prevent some rare linking errors on OSX by providing the minimal OS version also at link-time

extras/contrib/bootstrap

@@ -133,10 +133,10 @@ case $HOST in
         HAVE_DARWIN_9=1
         CFLAGS_TUNING=" -arch ppc -mtune=G4"
         EXTRA_CFLAGS=" -D\${ENVP} -isysroot \${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
-        EXTRA_LDFLAGS=" -arch ppc -isysroot \${MACOSX_SDK} -Wl,-syslibroot,\${MACOSX_SDK}"
+        EXTRA_LDFLAGS=" -arch ppc -isysroot \${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET} -Wl,-syslibroot,\${MACOSX_SDK}"
         CC="/Developer/usr/llvm-gcc-4.2/bin/llvm-gcc-4.2"
         CXX="/Developer/usr/llvm-gcc-4.2/bin/llvm-g++-4.2"
-        LD="ld -arch ppc -syslibroot \${MACOSX_SDK}"
+        LD="ld -arch ppc -syslibroot \${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
         echo "PATH = /bin:/usr/bin:/usr/local/bin:" >> config.mak
         cat src/Distributions/darwin.mak >> distro.mak
         if test -e /Developer/SDKs; then
@@ -161,7 +161,7 @@ case $HOST in
         echo "MACOSX_SDK = /Developer/SDKs/MacOSX10.5.sdk" >> config.mak
         CFLAGS_TUNING=" -march=prescott -mtune=generic -arch i386"
         EXTRA_CFLAGS=" -D\${ENVP} -isysroot \${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
-        EXTRA_LDFLAGS=" -arch i386 -isysroot \${MACOSX_SDK} -Wl,-syslibroot,\${MACOSX_SDK}"
+        EXTRA_LDFLAGS=" -arch i386 -isysroot \${MACOSX_SDK} -Wl,-syslibroot,\${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
         CC="/Developer/usr/llvm-gcc-4.2/bin/llvm-gcc-4.2"
         CXX="/Developer/usr/llvm-gcc-4.2/bin/llvm-g++-4.2"
         echo "PATH = /bin:/usr/bin:/usr/local/bin" >> config.mak
@@ -188,7 +188,7 @@ case $HOST in
             CFLAGS_TUNING=" -march=prescott -mtune=core2"
         fi
         EXTRA_CFLAGS=" -D\${ENVP} -isysroot \${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
-        EXTRA_LDFLAGS=" -isysroot \${MACOSX_SDK} -Wl,-syslibroot,\${MACOSX_SDK}"
+        EXTRA_LDFLAGS=" -isysroot \${MACOSX_SDK} -Wl,-syslibroot,\${MACOSX_SDK} -mmacosx-version-min=\${SDK_TARGET}"
         echo "PATH = /bin:/usr/bin:/usr/local/bin" >> config.mak
         CC="gcc"
         CXX="g++"