diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index c02d4c2a..c55fb9b4 100644 --- a/configure.ac +++ b/configure.ac @@ -311,6 +311,16 @@ CFLAGS="$old_CFLAGS"]) AM_CONDITIONAL(HAVE_NULL_DEREFERENCE_WARNING, [test "x$ac_cv_null_dereference" != "xno"]) +# -Wimplicit-fallthrough was added by GCC7 +AC_CACHE_CHECK([whether gcc accepts -Wimplicit-fallthrough], ac_cv_implicit_fallthrough, [dnl +old_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -Wimplicit-fallthrough -Werror" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([])], + ac_cv_implicit_fallthrough=yes, ac_cv_implicit_fallthrough=no) +CFLAGS="$old_CFLAGS"]) +AM_CONDITIONAL(HAVE_IMPLICIT_FALLTHROUGH_WARNING, + [test "x$ac_cv_implicit_fallthrough" != "xno"]) + dnl Check if we have argp available from our libc AC_LINK_IFELSE( [AC_LANG_PROGRAM( |