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[patch #9926] AC_PROG_CC_FOR_BUILD: "test: =: unary operator expected"

From: Max Horn
Subject: [patch #9926] AC_PROG_CC_FOR_BUILD: "test: =: unary operator expected"
Date: Wed, 17 Jun 2020 05:09:12 -0400 (EDT)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15

Follow-up Comment #1, patch #9926 (project autoconf-archive):

The relevant shell script triggering the warning is this:

if test $ac_compiler_gnu = yes; then

So this is a classical case of $ac_compiler_gnu not being set. One can fix it
by checking `$ac_compiler_gnu = xyes` instead. 

As such, I would suspect this commit as source of the regression:;a=commitdiff;h=10e1f73a781df74eb7b088948d78793b11b12225

But that might be totally wrong. Unfortunately, I don't know enough about m4
or the autoconf internals to figure out what the proper fix for this ought to
be :-(. Perhaps the patch author (Jannick) has an idea?


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