Add helper to work around Solaris /bin/sh bug in Autotest.

[dxcommon.git] / snippet / at-compat.at

diff --git a/snippet/at-compat.at b/snippet/at-compat.at
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+++ b/snippet/at-compat.at
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+# Copyright © 2023 Nick Bowler
+#
+# Compatibility helper for Autotest test suites.  This should be included
+# before expanding AT_INIT
+#
+# License WTFPL2: Do What The Fuck You Want To Public License, version 2.
+# This is free software: you are free to do what the fuck you want to.
+# There is NO WARRANTY, to the extent permitted by law.
+
+# Redefine AT_INIT to work around nonportable constructs in current
+# (as of 2023) Autoconf releases:
+#
+#   - In a shell function, redirections on : are not correctly handled
+#     by Solaris /bin/sh.  See the following Autoconf patch for details:
+#
+#       https://lists.gnu.org/archive/html/autoconf-patches/2021-03/msg00000.html
+
+m4_define([AT_INIT],
+  m4_bpatsubst(m4_dquote(m4_defn([AT_INIT])),
+    [^\( *\)\(: >"\$at_stdout".*$\)], [\1eval '\2']))