autotools: check if compiler is new enough

We line up with the Linux kernel and won't support any compiler under 4.6. Additionally, we also require at least gnu99 so this is due anyway. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

autotools: check if compiler is new enough
5ac017fb · Christian Brauner · 28f1d8bb · 5ac017fb
Unverified Commit 5ac017fb authored Aug 22, 2018 by Christian Brauner
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configure.ac configure.ac +16 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,22 @@ AC_CANONICAL_HOST
 AM_PROG_CC_C_O
 AC_GNU_SOURCE

+# Test if we have a new enough compiler.
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#define GCC_VERSION \
+	(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+
+#define CLANG_VERSION \
+	(__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
+
+#if GCC_VERSION < 40600 && CLANG_VERSION < 10000
+#error Sorry, your compiler is too old - please upgrade it
+#endif
+	]])], [valid_compiler=yes], [valid_compiler=no])
+if test "x$valid_compiler" = "xno"; then
+	AC_MSG_ERROR([Sorry, your compiler is too old - please upgrade it])
+fi
+
 # libtool
 LT_INIT
 AC_SUBST([LIBTOOL_DEPS])