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build-sys: Detect whether struct statx is defined in sys/stat.h

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Starting with glibc 2.27.9000-36.fc29, include file sys/stat.h will have a
definition for struct statx, in which case include file linux/stat.h should be
avoided, in order to prevent a duplicate definition.

    In file included from ../src/basic/missing.h:18,
		     from ../src/basic/util.h:28,
		     from ../src/basic/hashmap.h:10,
		     from ../src/shared/bus-util.h:12,
		     from ../src/libsystemd/sd-bus/bus-creds.c:11:
    /usr/include/linux/stat.h:99:8: error: redefinition of ‘struct statx’
     struct statx {
	    ^~~~~
    In file included from /usr/include/sys/stat.h:446,
		     from ../src/basic/util.h:19,
		     from ../src/basic/hashmap.h:10,
		     from ../src/shared/bus-util.h:12,
		     from ../src/libsystemd/sd-bus/bus-creds.c:11:
    /usr/include/bits/statx.h:36:8: note: originally defined here
     struct statx
	    ^~~~~

Extend our meson.build to look for struct statx when only sys/stat.h is
included and, in that case, do not include linux/stat.h anymore.

Tested that systemd builds correctly when using a glibc version that includes a
definition for struct statx.

glibc Fedora RPM update:
28cb5d31fc

glibc upstream commit:
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=fd70af45528d59a00eb3190ef6706cb299488fcd
This commit is contained in:
Filipe Brandenburger 2018-07-15 22:43:35 -07:00 committed by Lennart Poettering
parent 86d18f3b09
commit 75720bff62
3 changed files with 9 additions and 2 deletions
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5
meson.build
View File

@ -425,6 +425,7 @@ decl_headers = '''
#include <sys/stat.h>
'''
# FIXME: key_serial_t is only defined in keyutils.h, this is bound to fail
# FIXME: these should use -D_GNU_SOURCE, since that is defined at build time
foreach decl : ['char16_t',
'char32_t',
@ -439,6 +440,10 @@ foreach decl : ['char16_t',
conf.set10('HAVE_' + decl.underscorify().to_upper(), have)
endforeach
conf.set10('HAVE_STRUCT_STATX_IN_SYS_STAT_H', cc.sizeof('struct statx', prefix : '''
#include <sys/stat.h>
''', args : '-D_GNU_SOURCE') > 0)
foreach decl : [['IFLA_INET6_ADDR_GEN_MODE', 'linux/if_link.h'],
['IN6_ADDR_GEN_MODE_STABLE_PRIVACY', 'linux/if_link.h'],
['IFLA_VRF_TABLE', 'linux/if_link.h'],

5
src/basic/missing.h
View File

@ -15,7 +15,6 @@
#include <linux/neighbour.h>
#include <linux/oom.h>
#include <linux/rtnetlink.h>
#include <linux/stat.h>
#include <net/ethernet.h>
#include <stdlib.h>
#include <sys/resource.h>
@ -25,6 +24,10 @@
#include <uchar.h>
#include <unistd.h>
#if !HAVE_STRUCT_STATX_IN_SYS_STAT_H
#include <linux/stat.h>
#endif
#if HAVE_AUDIT
#include <libaudit.h>
#endif

1
src/basic/xattr-util.c
View File

@ -2,7 +2,6 @@
#include <errno.h>
#include <fcntl.h>
#include <linux/stat.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>