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Re: AC_FUNC_ALLOCA generates warning (problem with -Werror)

From: Paul Eggert
Subject: Re: AC_FUNC_ALLOCA generates warning (problem with -Werror)
Date: Mon, 05 Jun 2006 19:01:24 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

Jaap Haitsma <address@hidden> writes:

> This generates a warning that the variable p is never used. This is a
> problem when you run configure with CFLAG="-Werror". Compilation of the
> above code will fail.

Can you please give more details?  I can't reproduce the problem.

Here's how I tried:

$ cat configure.ac
$ autoconf
$ ./configure CFLAGS='-Werror'
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking how to run the C preprocessor... gcc -E
checking for egrep... grep -E
checking for working alloca.h... yes
checking for alloca... yes
configure: creating ./config.status
$ gcc --version | sed 1q
gcc (GCC) 4.1.1
$ uname -a
Linux penguin 2.4.27-3-686 #1 Wed Feb 8 12:40:33 UTC 2006 i686 GNU/Linux
$ autoconf --version | sed 1q
autoconf (GNU Autoconf) 2.59

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