meson: run compiler checks with -D_GNU_SOURCE when necessary

Through the addition of default_options: c_std=c99 some build-time
checks were incorrect. Explicitly add -D_GNU_SOURCE where necessary.

Fixes: 6240e4458cdf ("build: use -std=c99 and -std=c++11 by default")
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
(cherry picked from commit 1eeabbb42649f8334b6330689fec54325591fe2f)

diff --git a/meson.build b/meson.build
index 13d78a4f4ce362dc8befa202ccecd027ea972f74..b13c060dc1005f6798bfbf7688b5053a5d71d058 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -458,7 +458,9 @@ conf.set10('HAVE_STRSIGNAL_DECL', have)
 have = cc.sizeof('union semun', prefix : '#include <sys/sem.h>') > 0
 conf.set('HAVE_UNION_SEMUN', have ? 1 : false)
 
-have = cc.has_type('loff_t', prefix : '#include <sys/types.h>')
+have = cc.has_type('loff_t',
+                   args : '-D_GNU_SOURCE',
+                   prefix : '#include <sys/types.h>')
 conf.set('HAVE_LOFF_T', have ? 1 : false)
 
 have = cc.compiles('''
@@ -642,6 +644,7 @@ have_ddfd = cc.has_member('DIR', 'dd_fd',
 conf.set('HAVE_DECL_DDFD', have_ddfd ? 1 : false)
 
 have = cc.has_member('struct tm', 'tm_gmtoff',
+                     args : '-D_GNU_SOURCE',
                      prefix : '''
                      #include <time.h>
                      #include <unistd.h>
@@ -658,6 +661,7 @@ have = cc.has_member('struct termios', 'c_line',
 conf.set('HAVE_STRUCT_TERMIOS_C_LINE', have ? 1 : false)
 
 have = cc.has_member('struct stat', 'st_mtim.tv_nsec',
+                     args : '-D_GNU_SOURCE',
                      prefix : '#include <sys/stat.h>')
 conf.set('HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC', have ? 1 : false)
 
@@ -667,6 +671,7 @@ conf.set('HAVE_STRUCT_STATX_STX_MNT_ID', have ? 1 : false)
 
 # replacement for AC_STRUCT_TIMEZONE
 have = cc.has_member('struct tm', 'tm_zone',
+                     args : '-D_GNU_SOURCE',
                      prefix : '#include <time.h>')
 conf.set('HAVE_STRUCT_TM_TM_ZONE', have ? 1 : false)