use #pragma once instead of foo*foo #define guards

 #pragma once has been "un-deprecated" in gcc since 3.3, and is widely supported
in other compilers.

I've been using and maintaining (rebasing) this patch for a while now, as
it annoyed me to see #ifndef fooblahfoo, etc all over the place,
almost arrogant about the annoyance of having to define all these names to
perform a commen but neccicary functionality, when a completely superior
alternative exists.

I havn't sent it till now, cause its kindof a style change, and it is bad
voodoo to mess with style that has been established by more established
editors. So feel free to lambast me as a crazy bafoon.

v2 - preserve externally used headers

7 files changed, 7 insertions, 27 deletions

diff --git a/src/journal/compress.h b/src/journal/compress.h
index 1cdfe3d481..b6f1aa0ed7 100644
--- a/src/journal/compress.h
+++ b/src/journal/compress.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foocompresshfoo
-#define foocompresshfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -34,5 +33,3 @@ bool uncompress_startswith(const void *src, uint64_t src_size,
                            void **buffer, uint64_t *buffer_size,
                            const void *prefix, uint64_t prefix_len,
                            uint8_t extra);
-
-#endif
diff --git a/src/journal/journal-def.h b/src/journal/journal-def.h
index ac89e61d93..096dd8ed83 100644
--- a/src/journal/journal-def.h
+++ b/src/journal/journal-def.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foojournaldefhfoo
-#define foojournaldefhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -182,5 +181,3 @@ _packed_ struct Header {
         le64_t n_data;
         le64_t n_fields;
 };
-
-#endif
diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index 1f7f73a78d..eed49e062f 100644
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foojournalfilehfoo
-#define foojournalfilehfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -147,5 +146,3 @@ int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *
 int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);
 
 bool journal_file_rotate_suggested(JournalFile *f);
-
-#endif
diff --git a/src/journal/journal-internal.h b/src/journal/journal-internal.h
index 04f77540c9..d17fdb2e92 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foojournalinternalhfoo
-#define foojournalinternalhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -112,4 +111,3 @@ struct sd_journal {
 char *journal_make_match_string(sd_journal *j);
 void journal_print_header(sd_journal *j);
 
-#endif
diff --git a/src/journal/journal-rate-limit.h b/src/journal/journal-rate-limit.h
index cbf526c64f..648ab22786 100644
--- a/src/journal/journal-rate-limit.h
+++ b/src/journal/journal-rate-limit.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foojournalratelimithfoo
-#define foojournalratelimithfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -30,5 +29,3 @@ typedef struct JournalRateLimit JournalRateLimit;
 JournalRateLimit *journal_rate_limit_new(usec_t interval, unsigned burst);
 void journal_rate_limit_free(JournalRateLimit *r);
 int journal_rate_limit_test(JournalRateLimit *r, const char *id, int priority, uint64_t available);
-
-#endif
diff --git a/src/journal/journald.h b/src/journal/journald.h
index 3537a49420..acf19b4e7a 100644
--- a/src/journal/journald.h
+++ b/src/journal/journald.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foojournaldhfoo
-#define foojournaldhfoo
+#pragma once
 
 /***
   This file is part of systemd.
@@ -106,5 +105,3 @@ int config_parse_storage(const char *filename, unsigned line, const char *sectio
 
 const char *storage_to_string(Storage s);
 Storage storage_from_string(const char *s);
-
-#endif
diff --git a/src/journal/lookup3.h b/src/journal/lookup3.h
index 31cc2f57b0..502b42c209 100644
--- a/src/journal/lookup3.h
+++ b/src/journal/lookup3.h
@@ -1,7 +1,6 @@
 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
-#ifndef foolookup3hfoo
-#define foolookup3hfoo
+#pragma once
 
 #include <inttypes.h>
 #include <sys/types.h>
@@ -21,5 +20,3 @@ static inline uint64_t hash64(const void *data, size_t length) {
 
         return ((uint64_t) a << 32ULL) | (uint64_t) b;
 }
-
-#endif