From 1fb019b26d54f777ea7a2781f96adec369a25cbc Mon Sep 17 00:00:00 2001
From: Oliver Freyermuth <o.freyermuth@googlemail.com>
Date: Tue, 17 Jan 2023 19:00:11 +0100
Subject: [PATCH] PR #1538: configure: Remove bashisms, fix dash compatibility
Bug: https://bugs.gentoo.org/890873
Bug: https://github.com/hpc/charliecloud/pull/1538

+= and |& are not supported by systems using dash as shell.
---
 configure.ac | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 683a532..1c878d7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -216,15 +216,15 @@ AC_PROG_CC
 # Set up CFLAGS.
 ch_cflags='-std=c99 -Wall'
 AS_IF([test -n "$lib_libsquashfuse"],
-      [ch_cflags+=" -I$inc_libsquashfuse -L$lib_libsquashfuse"
+      [ch_cflags="$ch_cflags -I$inc_libsquashfuse -L$lib_libsquashfuse"
        # Without this, clang fails with "error: argument unused during
        # compilation" on the -L. GCC ignores it.
-       ch_cflags+=' -Wno-unused-command-line-argument'])
+       ch_cflags="$ch_cflags -Wno-unused-command-line-argument"])
 AS_IF([test $use_werror = yes],
-      [ch_cflags+=' -Werror'])
+      [ch_cflags="$ch_cflags -Werror"])

 AX_CHECK_COMPILE_FLAG([$ch_cflags], [
-  CFLAGS+=" $ch_cflags"
+  CFLAGS="$CFLAGS $ch_cflags"
 ], [
   AC_MSG_ERROR([no suitable C99 compiler found])
 ])
@@ -434,7 +434,7 @@ CH_CHECK_VERSION([GIT], [$vmin_git], [--version | cut -d' ' -f3])
 # DOT
 vmin_dot=2.30.1
 AC_CHECK_PROG([DOT], [dot], [dot])
-CH_CHECK_VERSION([DOT], [$vmin_dot], [dot -V |& cut -d' ' -f5])
+CH_CHECK_VERSION([DOT], [$vmin_dot], [dot -V 2>&1 | cut -d' ' -f5])

 # git2dot
 vmin_git2dot=0.8.3
--
2.38.2