Re: minor improvements for {...} problem; also, prefer && to ;

[Ralf Wildenhues]

Hello Paul,

* Paul Eggert wrote on Fri, Nov 09, 2007 at 09:47:06AM CET:
> I installed this:
> 
> 2007-11-09  Paul Eggert  <address@hidden>
> 
>       * doc/autoconf.texi (Limitations of Builtins): Document problem
>       with { ... } a bit more clearly.  Suggest ":;{" as a shorthand
>       for the workaround.
>       * lib/m4sugar/Makefile.am (version.m4): Detect 'echo' failure.
>       Use ":;{" shorthand.
>       * tests/Makefile.am ($(srcdir)/package.m4): Likewise.

Could you git-push, please, so that I can apply this followup patch?

Thank you,
Ralf

    * doc/autoconf.texi (Making testsuite Scripts): Document
    ":;{" shorthand as in previous patch.

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 421056e..8c3a17d 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -20231,13 +20231,14 @@ we suggest that you also define 
@code{AT_PACKAGE_NAME},
 suggest the following makefile excerpt:
 
 @smallexample
+# The `:;' works around a Bash 3.2 bug when the output is not writeable.
 $(srcdir)/package.m4: $(top_srcdir)/configure.ac
-        @{                                      \
-          echo '# Signature of the current package.'; \
-          echo 'm4_define([AT_PACKAGE_NAME],      [@@PACKAGE_NAME@@])'; \
-          echo 'm4_define([AT_PACKAGE_TARNAME],   [@@PACKAGE_TARNAME@@])'; \
-          echo 'm4_define([AT_PACKAGE_VERSION],   [@@PACKAGE_VERSION@@])'; \
-          echo 'm4_define([AT_PACKAGE_STRING],    [@@PACKAGE_STRING@@])'; \
+        :;@{ \
+          echo '# Signature of the current package.' && \
+          echo 'm4_define([AT_PACKAGE_NAME],      [@@PACKAGE_NAME@@])' && \
+          echo 'm4_define([AT_PACKAGE_TARNAME],   [@@PACKAGE_TARNAME@@])' && \
+          echo 'm4_define([AT_PACKAGE_VERSION],   [@@PACKAGE_VERSION@@])' && \
+          echo 'm4_define([AT_PACKAGE_STRING],    [@@PACKAGE_STRING@@])' && \
           echo 'm4_define([AT_PACKAGE_BUGREPORT], [@@PACKAGE_BUGREPORT@@])'; \
         @} >'$(srcdir)/package.m4'
 @end smallexample