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[SCM] GNU M4 source repository branch, branch-1.4, updated. v1.4.16-21-g


From: Eric Blake
Subject: [SCM] GNU M4 source repository branch, branch-1.4, updated. v1.4.16-21-ge0c743b
Date: Mon, 19 Nov 2012 22:20:10 +0000

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU M4 source repository".

http://git.sv.gnu.org/gitweb/?p=m4.git;a=commitdiff;h=e0c743b759a8f2dcc2dbabef3d7016fcda701a3e

The branch, branch-1.4 has been updated
       via  e0c743b759a8f2dcc2dbabef3d7016fcda701a3e (commit)
      from  d4017710b79aef691f1eb04f438ec7fe1b5cfc50 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
commit e0c743b759a8f2dcc2dbabef3d7016fcda701a3e
Author: Eric Blake <address@hidden>
Date:   Mon Nov 19 14:17:53 2012 -0700

    build: avoid problematic gcc 4.4 warnings
    
    Warnings that make sense under newer gcc can cause spurious
    failures under older gcc; it's nice to allow out-of-the-box
    development on stable releases while still getting the benefit
    of improved warning detection in bleeding-edge setups.
    
    * configure.ac (nw): Disable gcc warnings that cause build
    failures under RHEL 6.3.
    * gnulib: Update to latest.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog    |    7 +++++++
 configure.ac |   23 ++++++++++++++++++++++-
 gnulib       |    2 +-
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b369e83..c415f70 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-11-19  Eric Blake  <address@hidden>
+
+       build: avoid problematic gcc 4.4 warnings
+       * configure.ac (nw): Disable gcc warnings that cause build
+       failures under RHEL 6.3.
+       * gnulib: Update to latest.
+
 2012-11-14  Paul Eggert  <address@hidden>
 
        doc: improve prehistory discussion
diff --git a/configure.ac b/configure.ac
index e986de2..2d7ceef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,7 @@ if test "$gl_gcc_warnings" = yes; then
     [M4_cv_gcc_pragma_push_works=no])
     CFLAGS=$save_CFLAGS])
 
+  # This, $nw, is the list of warnings we disable.
   nw=
   nw="$nw -Waggregate-return"       # K&R is anachronistic
   nw="$nw -Wtraditional-conversion" # K&R is anachronistic
@@ -87,7 +88,27 @@ if test "$gl_gcc_warnings" = yes; then
   nw="$nw -Wsign-conversion"        # Too many warnings for now
   nw="$nw -Wcast-qual"              # Too many warnings for now
   nw="$nw -Wswitch-enum"            # Too many warnings for now
-  # This, $nw, is the list of warnings we disable.
+  # gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
+  nw="$nw -Wenum-compare"
+
+  # Gnulib uses '#pragma GCC diagnostic push' to silence some
+  # warnings, but older gcc doesn't support this.
+  AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
+    [M4_cv_gcc_pragma_push_works], [
+    save_CFLAGS=$CFLAGS
+    CFLAGS='-Wunknown-pragmas -Werror'
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+      #pragma GCC diagnostic push
+      #pragma GCC diagnostic pop
+    ]])],
+    [M4_cv_gcc_pragma_push_works=yes],
+    [M4_cv_gcc_pragma_push_works=no])
+    CFLAGS=$save_CFLAGS])
+  if test $M4_cv_gcc_pragma_push_works = no; then
+    nw="$nw -Wmissing-prototypes"
+    nw="$nw -Wmissing-declarations"
+    nw="$nw -Wunreachable-code"
+  fi
 
   gl_MANYWARN_ALL_GCC([ws])
   gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
diff --git a/gnulib b/gnulib
index 3a9002d..fd9f1ac 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 3a9002d3cc63da7110f133b1040d2d2b0aad8305
+Subproject commit fd9f1acededd74f8cd095e657528aa8fad183536


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