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

[Max Horn]

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
  GCC_FOR_BUILD=yes
else
  GCC_FOR_BUILD=
fi


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:
http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;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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