pandora-build v0.1

[awesomized/libmemcached] / m4 / pandora_ensure_gcc_version.m4

diff --git a/m4/pandora_ensure_gcc_version.m4 b/m4/pandora_ensure_gcc_version.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/pandora_ensure_gcc_version.m4
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+dnl  Copyright (C) 2009 Sun Microsystems
+dnl This file is free software; Sun Microsystems
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl If the user is on a Mac and didn't ask for a specific compiler
+dnl You're gonna get 4.2.
+AC_DEFUN([PANDORA_MAC_GCC42],
+  [AS_IF([test "$GCC" = "yes"],[
+    AS_IF([test "$host_vendor" = "apple" -a "x${ac_cv_env_CC_set}" = "x"],[
+      AS_IF([test -f /usr/bin/gcc-4.2],
+        [
+          CPP="/usr/bin/gcc-4.2 -E"
+          CC=/usr/bin/gcc-4.2
+          CXX=/usr/bin/g++-4.2
+        ])
+    ])
+  ])
+])
+
+dnl 
+AC_DEFUN([PANDORA_ENSURE_GCC_VERSION],[
+  AC_REQUIRE([PANDORA_MAC_GCC42])
+  AC_CACHE_CHECK([if GCC is recent enough], [ac_cv_gcc_recent],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#if !defined(__GNUC__) || (__GNUC__ < 4) || ((__GNUC__ >= 4) && (__GNUC_MINOR__ < 1))
+# error GCC is Too Old!
+#endif
+      ]])],
+      [ac_cv_gcc_recent=yes],
+      [ac_cv_gcc_recent=no])])
+  AS_IF([test "$ac_cv_gcc_recent" = "no" -a "$host_vendor" = "apple"],
+    AC_MSG_ERROR([Your version of GCC is too old. At least version 4.2 is required on OSX. You may need to install a version of XCode >= 3.1.2]))
+  AS_IF([test "$ac_cv_gcc_recent" = "no"],
+    AC_MSG_ERROR([Your version of GCC is too old. At least version 4.1 is required]))
+])