[PATCH] Use sed -E to escape variables in auto-load directories.

[John Baldwin <jhb@FreeBSD.org>]

Not all sed implementations support alternation via \| in the default
regular expressions.  However, POSIX ERE available via -E do support
these.  Switch to using POSIX ERE via -E when generating the escaped
versions of the auto-load directories.  This fixes the default setting
of the auto-load directories on FreeBSD.  Previously on FreeBSD the
sed invocation was a no-op causing the debugdir and datadir values to
be expanded yielding an autoload path of ':${prefix}/share/gdb'.

gdb/ChangeLog:

	* configure: Re-generate.
	* configure.ac: Use sed -E to escape variables in auto-load
	directories.
---
 gdb/ChangeLog    | 6 ++++++
 gdb/configure    | 4 ++--
 gdb/configure.ac | 4 ++--
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 348eb65ec7..f7b45793b3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2018-11-30  John Baldwin  <jhb@FreeBSD.org>
+
+	* configure: Re-generate.
+	* configure.ac: Use sed -E to escape variables in auto-load
+	directories.
+
 2018-11-30  John Baldwin  <jhb@FreeBSD.org>
 
 	* fbsd-nat.c [__FreeBSD_version >= 700009] (USE_SIGINFO): Macro
diff --git a/gdb/configure b/gdb/configure
index 7665ba6531..9e925cd27d 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -6579,7 +6579,7 @@ else
   with_auto_load_dir='$debugdir:$datadir/auto-load'
 fi
 
-escape_dir=`echo $with_auto_load_dir | sed 's/[$]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
+escape_dir=`echo $with_auto_load_dir | sed -E 's/[$](datadir|debugdir)\>/\\\\\\\\\\\\&/g'`
 
   test "x$prefix" = xNONE && prefix="$ac_default_prefix"
   test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
@@ -6606,7 +6606,7 @@ else
   with_auto_load_safe_path="$with_auto_load_dir"
 fi
 
-escape_dir=`echo $with_auto_load_safe_path | sed 's/[$]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
+escape_dir=`echo $with_auto_load_safe_path | sed -E 's/[$](datadir|debugdir)\>/\\\\\\\\\\\\&/g'`
 
   test "x$prefix" = xNONE && prefix="$ac_default_prefix"
   test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
diff --git a/gdb/configure.ac b/gdb/configure.ac
index e1ea60660b..4e18f94fed 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -146,7 +146,7 @@ AC_ARG_WITH(auto-load-dir,
 AS_HELP_STRING([--with-auto-load-dir=PATH],
   [directories from which to load auto-loaded scripts @<:@$debugdir:$datadir/auto-load@:>@]),,
   [with_auto_load_dir='$debugdir:$datadir/auto-load'])
-escape_dir=`echo $with_auto_load_dir | sed 's/[[$]]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
+escape_dir=`echo $with_auto_load_dir | sed -E 's/[[$]](datadir|debugdir)\>/\\\\\\\\\\\\&/g'`
 AC_DEFINE_DIR(AUTO_LOAD_DIR, escape_dir,
 	      [Directories from which to load auto-loaded scripts.])
 AC_MSG_RESULT([$with_auto_load_dir])
@@ -161,7 +161,7 @@ AS_HELP_STRING([--without-auto-load-safe-path],
      with_auto_load_safe_path="/"
      fi],
 [with_auto_load_safe_path="$with_auto_load_dir"])
-escape_dir=`echo $with_auto_load_safe_path | sed 's/[[$]]\(datadir\|debugdir\)\>/\\\\\\\\\\\\&/g'`
+escape_dir=`echo $with_auto_load_safe_path | sed -E 's/[[$]](datadir|debugdir)\>/\\\\\\\\\\\\&/g'`
 AC_DEFINE_DIR(AUTO_LOAD_SAFE_PATH, escape_dir,
 	      [Directories safe to hold auto-loaded files.])
 AC_MSG_RESULT([$with_auto_load_safe_path])
-- 
2.19.2