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build: workaround meson's cc.has_member() causing compiler warning.

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Otherwise, `CFLAGS='-Wall -Werror' meson build` fails with:

  ...
  #include <sys/stat.h>
          void bar(void) {
              struct stat foo;
              foo.st_mtim.tv_nsec;

          }
  -----------
  Command line: `cc /data/src/glib/build/meson-private/tmpbjjq3ikp/testfile.c -o /data/src/glib/build/meson-private/tmpbjjq3ikp/output.obj -c -O3 -Werror -Wall -D_FILE_OFFSET_BITS=64 -O0 -std=gnu99` -> 1
  stderr:
  /data/src/glib/build/meson-private/tmpbjjq3ikp/testfile.c: In function 'bar':
  /data/src/glib/build/meson-private/tmpbjjq3ikp/testfile.c:45:24: error: statement with no effect [-Werror=unused-value]
     45 |             foo.st_mtim.tv_nsec;
        |             ~~~~~~~~~~~^~~~~~~~
  cc1: all warnings being treated as errors
  -----------
  Checking whether type "struct stat" has member "st_mtim.tv_nsec" : NO
This commit is contained in:
Thomas Haller 2024-02-07 10:53:41 +01:00
parent 8ea0f7d045
commit 90817d0fab
1 changed files with 10 additions and 1 deletions
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11
meson.build
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@ -518,7 +518,16 @@ foreach m : struct_members
else else
header_check_prefix = header_check_prefix + '#include <sys/stat.h>' header_check_prefix = header_check_prefix + '#include <sys/stat.h>'
endif endif
if cc.has_member('struct ' + m[0], m[1], prefix : header_check_prefix) # Reimplement cc.has_member() to workaround compiler warning
# FIXME: https://github.com/mesonbuild/meson/pull/12818
code = header_check_prefix + '''
void bar(void) {
struct ''' + m[0] + ''' foo;
(void) ( foo.''' + m[1] + ''' );
(void) foo;
}
'''
if cc.compiles(code, name : 'type "struct ' + m[0] + '" has member "' + m[1] + '"')
define = 'HAVE_STRUCT_@0@_@1@'.format(m[0].to_upper(), m[1].underscorify().to_upper()) define = 'HAVE_STRUCT_@0@_@1@'.format(m[0].to_upper(), m[1].underscorify().to_upper())
glib_conf.set(define, 1) glib_conf.set(define, 1)
glib_conf_prefix = glib_conf_prefix + '#define @0@ 1\n'.format(define) glib_conf_prefix = glib_conf_prefix + '#define @0@ 1\n'.format(define)