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@ -0,0 +1,30 @@ |
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From 6c4a67ece33d9551429490898bb3c793a689e913 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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---
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m4/openssh.m4 | 3 +++ |
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1 file changed, 3 insertions(+) |
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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 |