Get --enable-gcc-warnings to work after touching configure.ac.

Preserve ACLOCAL_PATH in later builds, so that by default it has
the same value as it did in the first build after initial checkout.
* Makefile.in (ACLOCAL_PATH): New macro.
($(srcdir)/aclocal.m4): Use it.
* configure.ac (ACLOCAL_PATH): AC_SUBST it.
* autogen.sh (env_space): New var.
Tell user what variables, if any, to pass to 'configure'.

1 files changed, 9 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 61df7093527..a93a93c8f29 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 2014-05-03  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Get --enable-gcc-warnings to work after touching configure.ac.
+        Preserve ACLOCAL_PATH in later builds, so that by default it has
+        the same value as it did in the first build after initial checkout.
+        * Makefile.in (ACLOCAL_PATH): New macro.
+        ($(srcdir)/aclocal.m4): Use it.
+        * configure.ac (ACLOCAL_PATH): AC_SUBST it.
+        * autogen.sh (env_space): New var.
+        Tell user what variables, if any, to pass to 'configure'.
+
         Get --enable-gcc-warnings working again.
         The recent changes to configure.ac removed the transliteration of
         -I to -isystem in CFLAGS, which is needed for --enable-gcc-warnings.