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List:       bash-bug
Subject:    Re: Error: conflicting types =?utf-8?Q?for?= =?utf-8?B?IOKAmHNicmvigJk=?=
From:       Eduardo =?iso-8859-1?Q?A=2E_Bustamante_L=F3pez?= <dualbus () gmail ! com>
Date:       2018-03-22 14:36:22
Message-ID: 20180322143622.GA11815 () ubuntu
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On Wed, Mar 21, 2018 at 11:07:45AM -0300, Larissa Braz wrote:
> Hi,
> 
> I found the following compilation error:
> 
> xmalloc.c:51:14: error: conflicting types for ‘sbrk'
> extern char *sbrk();
> ^
> In file included from xmalloc.c:29:0:
> /usr/include/unistd.h:1043:14: note: previous declaration of ‘sbrk' was here
> extern void *sbrk (intptr_t __delta) __THROW;
[...]
> #if defined (HAVE_SBRK) && !HAVE_DECL_SBRK
> extern char *sbrk();
> #endif

This declaration is conditional. It will only be evaluated if

  HAVE_SBRK=1
  HAVE_DECL_SBRK=0

These are set by the configure script based on what it can detect from your
system. It is strange that it detects a
working sbrk implementation, but no sbrk declaration.

* What source tree are you building? (i.e. git devel branch, git master branch,
  tarball?)
* Also, are you passing any special parameters to `configure' or `make'?
* Can you share the following blocks from your config.log and config.h after
  running the configure script?


    $ grep -i 'checking for.*sbrk' config.log -A5
    configure:10615: checking for sbrk
    configure:10615: gcc -o conftest -ggdb -O0 -Wno-parentheses -Wno-format-security  \
conftest.c  >&5  configure:10615: $? = 0
    configure:10615: result: yes
    configure:10615: checking for fpurge
    configure:10615: gcc -o conftest -ggdb -O0 -Wno-parentheses -Wno-format-security  \
                conftest.c  >&5
    --
    configure:14469: checking for working sbrk
    configure:14496: gcc -o conftest -ggdb -O0 -Wno-parentheses -Wno-format-security  \
conftest.c -ldl  >&5  configure:14496: $? = 0
    configure:14496: ./conftest
    configure:14496: $? = 0
    configure:14506: result: yes
    
    $ grep SBRK config.h
    #define HAVE_DECL_SBRK 1
    #define HAVE_SBRK 1


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