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https://github.com/esnet/iperf/pull/1398
From 3a03f775ca103f2e824abef903130280c57ca8ac Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 2 Oct 2022 02:58:59 +0100
Subject: [PATCH] config/iperf_config_static_bin.m4: fix bashism
configure scripts need to be runnable with a POSIX-compliant /bin/sh.
On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '=='.
This retains compatibility with bash.
Fixes configure warnings/errors like:
```
./configure: 2670: test: x: unexpected operator
```
Signed-off-by: Sam James <sam@gentoo.org>
--- a/config/iperf_config_static_bin.m4
+++ b/config/iperf_config_static_bin.m4
@@ -7,6 +7,6 @@ AC_ARG_ENABLE([static-bin],
[:])
AM_CONDITIONAL([ENABLE_STATIC_BIN], [test x$enable_static_bin = xno])
-AS_IF([test "x$enable_static_bin" == xyes],
+AS_IF([test "x$enable_static_bin" = xyes],
[LDFLAGS="$LDFLAGS --static"]
[])
--- a/configure
+++ b/configure
@@ -2667,7 +2667,7 @@ else
fi
-if test "x$enable_static_bin" == xyes
+if test "x$enable_static_bin" = xyes
then :
LDFLAGS="$LDFLAGS --static"
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