From bc5aa8e2743e7b56818d54719bf4095a6dc09912 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim.demaille@gmail.com>
Date: Sun, 29 Aug 2021 09:38:07 +0200
Subject: [PATCH] tests: don't postprocess stderr with sed

On Solaris, sed throws away the NUL bytes from the stream, even in C
locale.  So instead of postprocessing bison's stderr to neutralize
changes in value of `argv[0]`, use an envvar to actually neutralize
variations of `argv[0]` during tests.

Reported by Dagobert Michelsen.
<https://lists.gnu.org/r/bug-bison/2021-08/msg00025.html>

* src/main.c (main): Change `argv[0]` if BISON_PROGRAM_NAME is
defined.
* tests/bison.in: No longer mess with stderr, just pass
the expected BISON_PROGRAM_NAME value.
---
 src/main.c     |  6 ++++++
 tests/bison.in | 24 +++++-------------------
 2 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/src/main.c b/src/main.c
index 22291d23..1185bf24 100644
--- a/src/main.c
+++ b/src/main.c
@@ -63,6 +63,12 @@
 int
 main (int argc, char *argv[])
 {
+  {
+    char *cp = getenv ("BISON_PROGRAM_NAME");
+    if (cp)
+      argv[0] = cp;
+  }
+
 #define DEPENDS_ON_LIBINTL 1
   set_program_name (argv[0]);
   setlocale (LC_ALL, "");
diff --git a/tests/bison.in b/tests/bison.in
index 80003aca..7732edd4 100644
--- a/tests/bison.in
+++ b/tests/bison.in
@@ -25,27 +25,13 @@ abs_top_builddir='@abs_top_builddir@'
 BISON_PKGDATADIR=$abs_top_srcdir/data
 export BISON_PKGDATADIR
 
-stderr=tmp-bison.$$
-
-# If stderr is a tty, force --color=yes to simulate --color=auto
-# although we save and modify stderr.
-if test -t 2; then
-    set x --color=yes ${1+"$@"}
-    shift
-fi
-
-# We redirect stderr, which breaks the computation of the terminal
-# screen width.  So export COLUMNS to Bison, hoping for the shell to
-# have defined it.
-: ${COLUMNS=`(tput cols) 2>/dev/null || echo 132`}
-export COLUMNS
-$PREBISON "$abs_top_builddir/src/bison" ${1+"$@"} 2>"$stderr"
-status=$?
-
 # Neutralize path differences in error messages so that check and
 # installcheck behave the same way.
-sed -e "s,$abs_top_builddir/src/,,g" <"$stderr" >&2
-rm -f "$stderr"
+BISON_PROGRAM_NAME=bison
+export BISON_PROGRAM_NAME
+
+$PREBISON "$abs_top_builddir/src/bison" ${1+"$@"}
+status=$?
 
 # As a special dark magic, if we are actually using this wrapper to
 # compile Bison's src/parse-gram.y, post-process the synclines to
-- 
2.11.4.GIT