configure: fix -Wimplicit-fallthrough check

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

configure: fix -Wimplicit-fallthrough check
579047f7 · Christian Brauner · 6dc5d141 · 579047f7 · 579047f7
Unverified Commit 579047f7 authored Sep 28, 2018 by Christian Brauner
Hide whitespace changes
Inline Side-by-side

Showing with 3 additions and 5 deletions

configure.ac configure.ac +1 -1

compiler.h src/lxc/compiler.h +2 -4

No files found.
--- a/configure.ac
+++ b/configure.ac
@@ -676,7 +676,7 @@ AC_PROG_SED
 LXC_CHECK_TLS

 AX_CHECK_COMPILE_FLAG([-fdiagnostics-color], [CFLAGS="$CFLAGS -fdiagnostics-color"],,[-Werror])
-AX_CHECK_COMPILE_FLAG([-implicit-fallthrough], [CFLAGS="$CFLAGS -Wimplicit-fallthrough"],,[-Werror])
+AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [CFLAGS="$CFLAGS -Wimplicit-fallthrough"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wcast-align], [CFLAGS="$CFLAGS -Wcast-align"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wstrict-prototypes], [CFLAGS="$CFLAGS -Wstrict-prototypes"],,[-Werror])


--- a/src/lxc/compiler.h
+++ b/src/lxc/compiler.h
@@ -37,10 +37,8 @@
 #endif
 #endif

-#if defined(__GNUC__) && __GNUC__ >= 7 || defined(__clang__)
-#define __fallthrough __attribute__((fallthrough))
-#else
-#define __fallthrough
+#ifndef __fallthrough
+#define __fallthrough /* fall through */
 #endif

 #ifndef __noreturn