Attachment 3573 Details for Bug 3394 – Improve detection of -fzero-call-used-regs=all support

[patch] Improve detection of -fzero-call-used-regs=all support

0001-Improve-detection-of-fzero-call-used-regs-all-suppor.patch (text/plain), 1.16 KB, created by Colin Watson on 2022-02-25 03:06:11 AEDT

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Creator: Colin Watson

Created: 2022-02-25 03:06:11 AEDT

Size: 1.16 KB

patch

obsolete

>From 423258fb1f7530223d304e6e0590d3e5dfa61bb6 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(+)
>
>diff --git a/m4/openssh.m4 b/m4/openssh.m4
>index 4f9c3792d..8c33c701b 100644
>--- 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
>-- 
>2.34.1
>

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Attachments on bug 3394: 3573