39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
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From b5fee5fe98f708c1dc61a1564db35eacadbfe8b3 Mon Sep 17 00:00:00 2001
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From: Colin Watson <cjwatson@debian.org>
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Date: Thu, 24 Feb 2022 16:04:18 +0000
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Subject: [PATCH] Improve detection of -fzero-call-used-regs=all support
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GCC doesn't tell us whether this option is supported unless it runs into
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the situation where it would need to emit corresponding code.
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[Upstream: https://github.com/openssh/openssh-portable/commit/f107467179428a0e3ea9e4aa9738ac12ff02822d.patch]
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Signed-off-by: Peter Seiderer <ps.report@gmx.net>
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---
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m4/openssh.m4 | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/m4/openssh.m4 b/m4/openssh.m4
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index 4f9c379..8c33c70 100644
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--- a/m4/openssh.m4
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+++ b/m4/openssh.m4
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@@ -14,6 +14,8 @@ AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <stdlib.h>
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#include <stdio.h>
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+/* Trivial function to help test for -fzero-call-used-regs */
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+void f(int n) {}
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int main(int argc, char **argv) {
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(void)argv;
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/* Some math to catch -ftrapv problems in the toolchain */
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@@ -21,6 +23,7 @@ int main(int argc, char **argv) {
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float l = i * 2.1;
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double m = l / 0.5;
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long long int n = argc * 12345LL, o = 12345LL * (long long int)argc;
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+ f(0);
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printf("%d %d %d %f %f %lld %lld\n", i, j, k, l, m, n, o);
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/*
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* Test fallthrough behaviour. clang 10's -Wimplicit-fallthrough does
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--
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2.35.1
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