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meson: Don't use cc.has_function to check for va_copy

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va_copy is not an ordinary function (an extern symbol), so we can't
treat it as one. Instead, use the same compilation/linking check as
in the Autotools build system.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2022-07-13 17:55:27 +01:00
parent 9016b48cf9
commit cfa56a666c
1 changed files with 29 additions and 2 deletions
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31
meson.build
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@ -607,8 +607,35 @@ config.set('HAVE_BACKTRACE', have_backtrace)
# we currently check for all three va_copy possibilities, so we get
# all results in config.log for bug reports.
has_va_copy = cc.has_function('va_copy')
has___va_copy = cc.has_function('__va_copy')
# Can't use cc.has_function here because va_copy is not
# exactly a function
va_copy_check = '''
#include <stdarg.h>
#include <stdlib.h>
static void f (int i, ...)
{
va_list args1, args2;
va_start (args1, i);
@0@ (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1);
va_end (args2);
}
int main()
{
f (0, 42);
return 0;
}
'''
has_va_copy = cc.links(va_copy_check.format('va_copy'))
has___va_copy = cc.links(va_copy_check.format('__va_copy'))
if has_va_copy
va_copy = 'va_copy'
elif has___va_copy