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use autoconf caching in alloca.m4


From: Bruno Haible
Subject: use autoconf caching in alloca.m4
Date: Fri, 20 Oct 2006 15:50:35 +0200
User-agent: KMail/1.9.1

This is a small optim, when gl_FUNC_ALLOCA is used several times by the same
configure file.

2006-10-19  Bruno Haible  <address@hidden>

        * m4/alloca.m4 (gl_FUNC_ALLOCA): Cache the result of the AC_EGREP_CPP
        invocation.

*** gnulib-20061019/m4/alloca.m4        2005-01-23 09:06:57.000000000 +0100
--- gnulib-20061019-modified/m4/alloca.m4       2006-10-20 02:11:02.000000000 
+0200
***************
*** 1,5 ****
! # alloca.m4 serial 5
! dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # alloca.m4 serial 6
! dnl Copyright (C) 2002-2004, 2006 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 17,32 ****
  
    # Define an additional variable used in the Makefile substitution.
    if test $ac_cv_working_alloca_h = yes; then
!     AC_EGREP_CPP([Need own alloca], [
  #if defined __GNUC__ || defined _AIX || defined _MSC_VER
!       Need own alloca
  #endif
!       ],
!       [AC_DEFINE(HAVE_ALLOCA, 1,
!           [Define to 1 if you have `alloca' after including <alloca.h>,
!            a header that may be supplied by this distribution.])
!        ALLOCA_H=alloca.h],
!       [ALLOCA_H=])
    else
      ALLOCA_H=alloca.h
    fi
--- 17,37 ----
  
    # Define an additional variable used in the Makefile substitution.
    if test $ac_cv_working_alloca_h = yes; then
!     AC_CACHE_VAL([gl_cv_rpl_alloca], [
!       AC_EGREP_CPP([Need own alloca], [
  #if defined __GNUC__ || defined _AIX || defined _MSC_VER
!           Need own alloca
  #endif
!         ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no])
!     ])
!     if test $gl_cv_rpl_alloca = yes; then
!       AC_DEFINE([HAVE_ALLOCA], 1,
!         [Define to 1 if you have `alloca' after including <alloca.h>,
!          a header that may be supplied by this distribution.])
!       ALLOCA_H=alloca.h
!     else
!       ALLOCA_H=
!     fi
    else
      ALLOCA_H=alloca.h
    fi




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