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[PATCH] m4sh: preserve set -vx over re-exec
From: |
Eric Blake |
Subject: |
[PATCH] m4sh: preserve set -vx over re-exec |
Date: |
Wed, 8 Sep 2010 10:45:29 -0600 |
See http://lists.gnu.org/archive/html/bug-gnulib/2010-09/msg00035.html
for the motivation for this patch.
* lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Trace through
re-exec, to make it easier to debug script startup issues.
Idea from recent bug-gnulib change to init.sh.
Signed-off-by: Eric Blake <address@hidden>
---
ChangeLog | 5 +++++
lib/m4sugar/m4sh.m4 | 9 ++++++++-
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 5edb50c..0277419 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
2010-09-08 Eric Blake <address@hidden>
+ m4sh: preserve set -vx over re-exec
+ * lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Trace through
+ re-exec, to make it easier to debug script startup issues.
+ Idea from recent bug-gnulib change to init.sh.
+
docs: update alloca recommendations
* doc/autoconf.texi (Particular Functions): Don't redeclare alloca
on FreeBSD.
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index ef99cb5..ca22161 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -227,11 +227,18 @@ dnl Remove any tests from suggested that are also required
[# We cannot yet assume a decent shell, so we have to provide a
# neutralization value for shells without unset; and this also
# works around shells that cannot unset nonexistent variables.
+ # Preserve -v and -x to the replacement shell.
BASH_ENV=/dev/null
ENV=/dev/null
(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
export CONFIG_SHELL
- exec "$CONFIG_SHELL" "$as_myself" ${1+"address@hidden"}])
+ case $- in @%:@ ((((
+ *v*x* | *x*v* ) as_opts=-vx ;;
+ *v* ) as_opts=-v ;;
+ *x* ) as_opts=-x ;;
+ * ) as_opts= ;;
+ esac
+ exec "$CONFIG_SHELL" $as_opts "$as_myself" ${1+"address@hidden"}])
dnl Unfortunately, $as_me isn't available here.
AS_IF([test x$as_have_required = xno],
--
1.7.2.2
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