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ImportC: va_arg fails in working C code (#21186)

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Fixes https://github.com/dlang/dmd/issues/20423

Ultimate cause of this issue was that va_arg was being shadowed
by the collected template-like macros. As va_arg is not a normal
function (it takes a type as a parameter), this interfered with
the cparser's rewrite of va_arg to a call to the single argument
template version in core.stdc.stdarg.
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drpriver 2025-04-10 14:10:31 -07:00 • committed by GitHub
parent e9984553e6
commit 493cd034a9
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2 changed files with 34 additions and 4 deletions
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compiler/test/compilable/test20423.c Normal file
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// https://github.com/dlang/dmd/issues/20423
#include <stdarg.h>
#include <stddef.h>
#include <assert.h>
void foo(double * pm, ...) {
va_list ap;
double * targ;
va_start(ap, pm);
for (int i=1; ; i++) {
va_arg(ap, int);
targ = va_arg(ap, double*);
if (targ == NULL) {
break;
}
}
va_end(ap);
}