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- From 6c4a67ece33d9551429490898bb3c793a689e913 Mon Sep 17 00:00:00 2001
- From: Colin Watson <cjwatson@debian.org>
- Date: Thu, 24 Feb 2022 16:04:18 +0000
- Subject: [PATCH] Improve detection of -fzero-call-used-regs=all support
-
- GCC doesn't tell us whether this option is supported unless it runs into
- the situation where it would need to emit corresponding code.
- ---
- m4/openssh.m4 | 3 +++
- 1 file changed, 3 insertions(+)
-
- --- a/m4/openssh.m4
- +++ b/m4/openssh.m4
- @@ -14,6 +14,8 @@ AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
- AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
- #include <stdlib.h>
- #include <stdio.h>
- +/* Trivial function to help test for -fzero-call-used-regs */
- +void f(int n) {}
- int main(int argc, char **argv) {
- (void)argv;
- /* Some math to catch -ftrapv problems in the toolchain */
- @@ -21,6 +23,7 @@ int main(int argc, char **argv) {
- float l = i * 2.1;
- double m = l / 0.5;
- long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
- + f(0);
- printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
- /*
- * Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does
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