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From fd2218e4a671f4aae752620481e541799585fa20 Mon Sep 17 00:00:00 2001
From: Eli Schwartz <eschwartz93@gmail.com>
Date: Wed, 6 Mar 2024 20:06:07 -0500
Subject: [PATCH] configure: fix broken bashisms resulting in logic failure
In a configure check that was carefully written for pre-unix-wars
versions of the bourne shell, some code which was only valid using GNU
bash was included.
Bash provides the standard `test XXX = YYY` or `[ XXX = YYY ]`
utilities. It also provides the ability to spell the equals sign as a
double equals. This does nothing whatsoever -- it adds no new
functionality to bash, it forbids nothing, it is *literally* an exact
alias.
It should never be used under any circumstances. All developers must
immediately forget that it exists. Using it is non-portable and does not
work in /bin/sh scripts such as configure scripts, and it results in
dangerous muscle memory when used in bash scripts because it makes
people unthinkingly use the double equals even in /bin/sh scripts. To
add insult to injury, it makes scripts take up more disk space (by a
whole byte! and sometimes even a few bytes...)
Delete this accidental bashism, and restore the ability to get correct
./configure behavior on systems where /bin/sh is something other than a
symlink to GNU bash.
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
---
configure.ac | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/configure.ac b/configure.ac
index c0ac33c..619e162 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,7 +44,7 @@ AC_ARG_ENABLE(debug,
[ --enable-debug Turn on debug compiler information],
[ENABLE_DEBUG_FLAG="$enableval"],
[ENABLE_DEBUG_FLAG="yes"])
-if [[ "x$ENABLE_DEBUG_FLAG" == "xyes" ]] ; then
+if test "$ENABLE_DEBUG_FLAG" = yes ; then
CXXFLAGS=${CXXFLAGS}" -g "
fi
@@ -63,7 +63,7 @@ dnl AM_LDFLAGS=" -lm "
dnl if the debug flags are on, check if we can also use
dnl some profiling tools
dnl COMMENTED: Pass LDFLAGS to configure instead
-dnl if [[ "x$ENABLE_DEBUG_FLAG" == "xyes" ]] ; then
+dnl if test "$ENABLE_DEBUG_FLAG" = yes ; then
dnl AC_CHECK_LIB(profiler, google_initializer_module_profiler)
dnl AC_CHECK_LIB(pthread, pthread_create)
dnl AC_CHECK_LIB(tcmalloc, malloc)
@@ -81,11 +81,11 @@ CXXFLAGS="$CXXFLAGS -Werror=deprecated-declarations"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <memory>]],[[int *a= new int(1); std::auto_ptr<int> b; b.reset(a);]])],
[ac_compilation_deprecated="no"],[ac_compilation_deprecated="yes"])
AC_MSG_RESULT([$ac_compilation_deprecated])
-if [[ "$ac_compilation_deprecated" == "yes" ]] ; then
+if test "$ac_compilation_deprecated" = yes ; then
AC_MSG_CHECKING([[if $CXX $CXXFLAGS supports atd::unique_ptr]])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <memory>]],[[int *a= new int(1); std::unique_ptr<int> b; b.reset(a);]])],
[ac_supports_unique_ptr="yes"],[as_supports_unique_ptr="no"])
- if [[ "$ac_supports_unique_ptr" == "yes" ]] ; then
+ if test "$ac_supports_unique_ptr" = "yes" ; then
AC_DEFINE(USES_UNIQUE_PTR_AS_AUTO_PTR, [], [use unique_ptr instead of auto_ptr])
fi
AC_MSG_RESULT([$ac_supports_unique_ptr])
--
2.43.0
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