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

Use OSSH_CHECK_CFLAG_LINK() for detection of these flags and extend
test program to exercise varargs, which seems to catch more stuff.

ok dtucker@
This commit is contained in:
Damien Miller 2023-12-18 14:49:11 +11:00
parent aa7b217085
commit 59d691b886
No known key found for this signature in database
2 changed files with 15 additions and 3 deletions
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4
configure.ac
View File

@ -234,9 +234,9 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
# clang 17 has a different bug that causes an ICE when using this
# flag at all (https://bugzilla.mindrot.org/show_bug.cgi?id=3629)
case "$CLANG_VER" in
apple-15*) OSSH_CHECK_CFLAG_COMPILE([-fzero-call-used-regs=used]) ;;
apple-15*) OSSH_CHECK_CFLAG_LINK([-fzero-call-used-regs=used]) ;;
17*) ;;
*) OSSH_CHECK_CFLAG_COMPILE([-fzero-call-used-regs=used]) ;;
*) OSSH_CHECK_CFLAG_LINK([-fzero-call-used-regs=used]) ;;
esac
OSSH_CHECK_CFLAG_COMPILE([-ftrivial-auto-var-init=zero])
fi

14
m4/openssh.m4
View File

@ -6,13 +6,23 @@ dnl behaviours.
AC_DEFUN([OSSH_COMPILER_FLAG_TEST_PROGRAM],
[AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/* Trivial function to help test for -fzero-call-used-regs */
int f(int n) {return rand() % n;}
char *f2(char *s, ...) {
char ret[64];
va_list args;
va_start(args, s);
vsnprintf(ret, sizeof(ret), s, args);
va_end(args);
return strdup(ret);
}
int main(int argc, char **argv) {
(void)argv;
char b[256];
char b[256], *cp;
/* Some math to catch -ftrapv problems in the toolchain */
int i = 123 * argc, j = 456 + argc, k = 789 - argc;
float l = i * 2.1;
@ -21,6 +31,8 @@ int main(int argc, char **argv) {
f(1);
snprintf(b, sizeof b, "%d %d %d %f %f %lld %lld\n", i,j,k,l,m,n,o);
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);
free(cp);
/*
* Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does
* not understand comments and we don't use the "fallthrough" attribute