tree-wide: remove unnecessary gcc >= 7 version check

Our baseline is gcc 8.4.

src/basic/MurmurHash2.c

@@ -16,9 +16,7 @@
 
 #include "MurmurHash2.h"
 
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 
 //-----------------------------------------------------------------------------
 // Platform-specific functions and macros

src/core/load-fragment-gperf.gperf.in

@@ -268,9 +268,7 @@
 {%- endmacro -%}
 
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "all-units.h"
 #include "conf-parser.h"

src/fundamental/macro-fundamental.h

@@ -84,10 +84,10 @@
 #  define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__)))
 #endif
 
-#if __GNUC__ >= 7 || (defined(__clang__) && __clang_major__ >= 10)
-#  define _fallthrough_ __attribute__((__fallthrough__))
-#else
+#if defined(__clang__) && __clang_major__ < 10
 #  define _fallthrough_
+#else
+#  define _fallthrough_ __attribute__((__fallthrough__))
 #endif
 
 #define XSTRINGIFY(x) #x

src/home/homed-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "homed-conf.h"

src/journal/journald-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include <sys/socket.h>
 #include "conf-parser.h"

src/libsystemd/sd-journal/lookup3.c

@@ -55,9 +55,7 @@ on 1 byte), but shoehorning those bytes into integers efficiently is messy.
 # include <endian.h>    /* attempt to define endianness */
 #endif
 
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 
 /*
  * My best guess at if you are big-endian or little-endian.  This may

src/login/logind-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "logind.h"

src/network/netdev/netdev-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "bareudp.h"
 #include "batadv.h"

src/network/networkd-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "networkd-address-label.h"

src/network/networkd-network-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <netinet/icmp6.h>
 #include <stddef.h>
 

src/nspawn/nspawn-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "nspawn-settings.h"

src/resolve/generate-dns_type-gperf.py

@@ -10,9 +10,7 @@ name, prefix, input = sys.argv[1:]
 
 print("""\
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \\"-Wimplicit-fallthrough\\"")
-#endif
 %}""")
 print("""\
 struct {}_name {{ const char* name; int id; }};

src/resolve/resolved-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "resolved-conf.h"

src/timesync/timesyncd-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "timesyncd-conf.h"

src/udev/generate-keyboard-keys-gperf.sh

@@ -6,9 +6,7 @@ set -eu
 awk '
     BEGIN {
         print "%{\n\
-#if __GNUC__ >= 7\n\
 _Pragma(\"GCC diagnostic ignored \\\"-Wimplicit-fallthrough\\\"\")\n\
-#endif\n\
 %}"
         print "struct key_name { const char* name; unsigned short id; };"
         print "%null-strings"

src/udev/net/link-config-gperf.gperf

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
-#endif
 #include <stddef.h>
 #include "conf-parser.h"
 #include "ethtool-util.h"

tools/generate-gperfs.py

@@ -16,9 +16,7 @@ if __name__ == '__main__':
 
     print("""\
 %{
-#if __GNUC__ >= 7
 _Pragma("GCC diagnostic ignored \\"-Wimplicit-fallthrough\\"")
-#endif
 %}""")
     print(f"""\
 struct {name}_name {{ const char* name; int id; }};