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openssh-portable
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better detection of broken -fzero-call-used-regs 

gcc 13.2.0 on ppc64le refuses to compile some function, including
cipher.c:compression_alg_list() with an error:

> sorry, unimplemented: argument ‘used’ is not supportedcw
> for ‘-fzero-call-used-regs’ on this target

This extends the autoconf will-it-work test with a similarly-
structured function that seems to catch this.

Spotted/tested by Colin Watson; bz3645
This commit is contained in:
Damien Miller 2023-12-22 17:56:26 +11:00
parent 8241b9c052
commit 1036d77b34
No known key found for this signature in database
1 changed files with 9 additions and 3 deletions
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m4/openssh.m4
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@ -20,18 +20,24 @@ char *f2(char *s, ...) {
va_end(args);
return strdup(ret);
}
const char *f3(int s) {
return s ? "good" : "gooder";
}
int main(int argc, char **argv) {
(void)argv;
char b[256], *cp;
const char *s;
/* Some math to catch -ftrapv problems in the toolchain */
int i = 123 * argc, j = 456 + argc, k = 789 - argc;
float l = i * 2.1;
double m = l / 0.5;
long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
(void)argv;
f(1);
snprintf(b, sizeof b, "%d %d %d %f %f %lld %lld\n", i,j,k,l,m,n,o);
s = f3(f(2));
snprintf(b, sizeof b, "%d %d %d %f %f %lld %lld %s\n", i,j,k,l,m,n,o,s);
if (write(1, b, 0) == -1) exit(0);
cp = f2("%d %d %d %f %f %lld %lld\n", i,j,k,l,m,n,o);
cp = f2("%d %d %d %f %f %lld %lld %s\n", i,j,k,l,m,n,o,s);
if (write(1, cp, 0) == -1) exit(0);
free(cp);
/*
* Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does