From 0aac3047cd7681d610b22d79501c297fa3433148 Mon Sep 17 00:00:00 2001
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From: Ross Burton <ross.burton@intel.com>
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Date: Thu, 12 Mar 2020 17:25:41 +0000
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Subject: [PATCH 2/7] m4sh: prefer bash over sh
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_AS_DETECT_BETTER_SHELL looks for a good shell to use, and tries to look for
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'sh' before 'bash'. Whilst for many systems sh is a symlink to bash,
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there are many where sh is a symlink to a more minimal sh implementation.
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For example, Debian by default has /bin/sh -> /bin/dash: dash is a faster
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shell to start (which makes a notable difference to boot speed) but is not
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as fast as bash at executing long scripts (and configure scripts are not
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known for their conciseness).
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Change the search order to bash then sh, so that a known-good shell (bash)
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is used if available over something which is merely POSIX compliant.
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---
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lib/m4sugar/m4sh.m4 | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
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index 9d543952..84ef84a9 100644
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--- a/lib/m4sugar/m4sh.m4
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+++ b/lib/m4sugar/m4sh.m4
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@@ -230,7 +230,7 @@ dnl Remove any tests from suggested that are also required
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[_AS_PATH_WALK([/bin$PATH_SEPARATOR/usr/bin$PATH_SEPARATOR$PATH],
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[case $as_dir in @%:@(
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/*)
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- for as_base in sh bash ksh sh5; do
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+ for as_base in bash sh ksh sh5; do
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# Try only shells that exist, to save several forks.
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as_shell=$as_dir$as_base
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AS_IF([{ test -f "$as_shell" || test -f "$as_shell.exe"; } &&
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--
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2.25.1
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