fundamental: adjust #if conditional for _fallthrough_ for clang

NetworkManager takes systemd sources. It gets compiler warnings
related to _fallthrough_. They probably can also affect systemd
itself.

A) on RHEL-7, gcc 4.8.5-44.el7 we get:

    ../src/libnm-systemd-shared/src/fundamental/macro-fundamental.h:45:22: error: "__clang__" is not defined [-Werror=undef]
     #if __GNUC__ >= 7 || __clang__
                          ^

   Presumably gcc older than 7 is supported, so fix this.

B) on Ubuntu 18.04, clang 1:6.0-41~exp5~ubuntu1 we get:

    ../src/libnm-systemd-core/src/libsystemd-network/sd-dhcp6-client.c:746:17: error: declaration does not declare anything [-Werror,-Wmissing-declarations]
                    _fallthrough_;
                    ^
    ../src/libnm-systemd-shared/src/fundamental/macro-fundamental.h:46:25: note: expanded from macro '_fallthrough_'
    #  define _fallthrough_ __attribute__((__fallthrough__))
                            ^

   Granted, README comments that clang >= 10 is required. However,
   parts of systemd build just fine with older clang. It seems unnecessary
   to break this and the fix helps NetworkManager.

Fixes: c0f5d58c9ab7 ('meson: Document why -Wimplicit-fallthrough is not used with clang')

diff --git a/src/fundamental/macro-fundamental.h b/src/fundamental/macro-fundamental.h
index 3c38afcab8293645b76d63ebd0b632d9a0cf67bd..a738b1f50e8151302493270c1f2f1f8faf52a33a 100644 (file)
--- a/src/fundamental/macro-fundamental.h
+++ b/src/fundamental/macro-fundamental.h
@@ -42,7 +42,7 @@
 #  define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__)))
 #endif
 
-#if __GNUC__ >= 7 || __clang__
+#if __GNUC__ >= 7 || (defined(__clang__) && __clang_major__ >= 10)
 #  define _fallthrough_ __attribute__((__fallthrough__))
 #else
 #  define _fallthrough_