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build: Check for Unix98 positional parameter support in printf()

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This is equivalent to the AC_FUNC_PRINTF_UNIX98 macro which we use in
configure.ac. There may still be some obscure Unix platforms which don’t
natively support positional parameters, 20 years on.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/glib/issues/1313
This commit is contained in:
Philip Withnall 2018-08-29 11:57:44 +01:00
parent c138b98e36
commit f35c4d5d42
1 changed files with 34 additions and 6 deletions
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40
meson.build
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@ -739,12 +739,14 @@ if cc.compiles('''#include <fcntl.h>
endif
# Check whether there is a vsnprintf() function with C99 semantics installed.
# AC_FUNC_VSNPRINTF_C99
# (similar tests to AC_FUNC_VSNPRINTF_C99)
# Check whether there is a snprintf() function with C99 semantics installed.
# AC_FUNC_SNPRINTF_C99
# (similar tests to AC_FUNC_SNPRINTF_C99)
# Check whether there is a printf() function with Unix98 semantics installed.
# (similar tests to AC_FUNC_PRINTF_UNIX98)
have_good_vsnprintf = false
have_good_snprintf = false
have_good_printf = false
if host_system == 'windows' and cc.get_id() == 'msvc'
# Unfortunately the Visual Studio 2015+ implementations of C99-style
@ -755,6 +757,7 @@ if host_system == 'windows' and cc.get_id() == 'msvc'
# rigorous enough to notice, though.
glib_conf.set('HAVE_C99_SNPRINTF', false)
glib_conf.set('HAVE_C99_VSNPRINTF', false)
glib_conf.set('HAVE_UNIX98_PRINTF', false)
else
vsnprintf_c99_test_code = '''
#include <stdio.h>
@ -851,6 +854,31 @@ main(void)
have_good_snprintf = meson.get_cross_property('have_c99_snprintf', false)
glib_conf.set('HAVE_C99_SNPRINTF', have_good_snprintf)
endif
printf_unix98_test_code = '''
#include <stdio.h>
int
main (void)
{
char buffer[128];
sprintf (buffer, "%2\$d %3\$d %1\$d", 1, 2, 3);
if (strcmp ("2 3 1", buffer) == 0)
exit (0);
exit (1);
}'''
if cc_can_run
rres = cc.run(printf_unix98_test_code, name : 'Unix98 printf positional parameters')
if rres.compiled() and rres.returncode() == 0
glib_conf.set('HAVE_UNIX98_PRINTF', 1)
have_good_printf = true
endif
else
have_good_printf = meson.get_cross_property('have_unix98_printf', false)
glib_conf.set('HAVE_UNIX98_PRINTF', have_good_printf)
endif
endif
if host_system == 'windows'
@ -859,9 +887,9 @@ else
glib_conf.set('EXEEXT', '')
endif
if have_good_vsnprintf and have_good_snprintf
# Our printf is 'good' only if vsnpintf()/snprintf() supports C99 well enough
glib_conf.set('HAVE_GOOD_PRINTF', 1) # FIXME: Check for HAVE_UNIX98_PRINTF?
if have_good_vsnprintf and have_good_snprintf and have_good_printf
# Our printf is 'good' only if vsnpintf()/snprintf()/printf() supports C99 well enough
glib_conf.set('HAVE_GOOD_PRINTF', 1)
else
glib_conf.set('HAVE_VASPRINTF', 1)
endif