bootstrap: cannot find package name in configure.ac

[Simon Josefsson via Gnulib discussion list <bug-gnulib@gnu.org>]

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Hi.  I'm setting GNU SASL up for git-version-gen and bootstrap, and
noticed that bootstrap doesn't handle git-version-gen well.  See:

jas@latte:~$ cat>configure.ac
AC_INIT([GNU SASL],
        m4_esyscmd([build-aux/git-version-gen .tarball-version]),
        [bug-gsasl@gnu.org],
        [gsasl])
jas@latte:~$ ~/src/gnulib/build-aux/bootstrap 
/home/jas/src/gnulib/build-aux/bootstrap: cannot find package name in configure.ac
jas@latte:~$ 

I'm using the patch below in gsasl, what do you think?

I didn't push the patch without discussion because bootstrap is such a
sensitive script used by many packages.  Maybe someone prefers to fix
the sed expression instead, if we want to support old autoconf without
support for --trace.

/Simon

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From d4c4a6350e465c145de74bb1ecf8099e77f006a4 Mon Sep 17 00:00:00 2001
From: Simon Josefsson <simon@josefsson.org>
Date: Wed, 6 Jan 2021 22:51:21 +0100
Subject: [PATCH] bootstrap: Fix parsing of package name.

* build-aux/bootstrap (package): Attempt to use autoconf --trace
to parse AC_INIT before falling back to sed expression.
---
 ChangeLog           | 6 ++++++
 build-aux/bootstrap | 9 ++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0831c85e1..f3a43c826 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2021-01-06  Simon Josefsson  <simon@josefsson.org>
+
+	bootstrap: Fix parsing of package name.
+	* build-aux/bootstrap (package): Attempt to use autoconf --trace
+	to parse AC_INIT before falling back to sed expression.
+
 2021-01-06  Bruno Haible  <bruno@clisp.org>
 
 	logb: Fix test failure on glibc/powerpc.
diff --git a/build-aux/bootstrap b/build-aux/bootstrap
index 7523f65b4..bb2410a45 100755
--- a/build-aux/bootstrap
+++ b/build-aux/bootstrap
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2020-11-18.17; # UTC
+scriptversion=2021-01-06.21; # UTC
 
 # Bootstrap this package from checked-out sources.
 
@@ -201,8 +201,11 @@ extract_package_name='
      p
   }
 '
-package=$(sed -n "$extract_package_name" configure.ac) \
-  || die 'cannot find package name in configure.ac'
+package=$(${AUTOCONF:-autoconf} --trace AC_INIT:\$4 configure.ac 2>/dev/null)
+if test -z "$package"; then
+  package=$(sed -n "$extract_package_name" configure.ac) \
+      || die 'cannot find package name in configure.ac'
+fi
 gnulib_name=lib$package
 
 build_aux=build-aux
-- 
2.20.1


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