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autotools: check if compiler is new enough

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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>
This commit is contained in:
Christian Brauner 2018-08-22 00:04:19 +02:00
parent 577abe431b
commit 9b5724cd58
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1 changed files with 16 additions and 0 deletions
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16
configure.ac
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@ -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])