Re: [PATCH/libiberty] fix build of gdb/binutils with clang.

[Ian Lance Taylor <iant@google.com>]

This is OK if GCC bootstraps.

Thanks.

Ian

On Wed, May 20, 2015 at 11:25 AM, Yunlian Jiang <yunlian@google.com> wrote:
> I have the following change to make libiberty compile with _GNU_SOURCE defined
> and remove the declaration of asprintf in libiberty.h if
> HAVE_DECL_ASPRINTF is not
> defined.
>
> diff --git a/include/libiberty.h b/include/libiberty.h
> index b33dd65..8e096a0 100644
> --- a/include/libiberty.h
> +++ b/include/libiberty.h
> @@ -621,7 +621,7 @@ extern int pexecute (const char *, char * const *,
> const char *,
>
>  extern int pwait (int, int *, int);
>
> -#if !HAVE_DECL_ASPRINTF
> +#if defined(HAVE_DECL_ASPRINTF) && !HAVE_DECL_ASPRINTF
>  /* Like sprintf but provides a pointer to malloc'd storage, which must
>     be freed by the caller.  */
>
> diff --git a/libiberty/Makefile.in b/libiberty/Makefile.in
> index f06cc69..624420d 100644
> --- a/libiberty/Makefile.in
> +++ b/libiberty/Makefile.in
> @@ -113,7 +113,8 @@ installcheck: installcheck-subdir
>
>  INCDIR=$(srcdir)/$(MULTISRCTOP)../include
>
> -COMPILE.c = $(CC) -c @DEFS@ $(CFLAGS) $(CPPFLAGS) -I. -I$(INCDIR)
> $(HDEFINES) @ac_libiberty_warn_cflags@
> +COMPILE.c = $(CC) -c @DEFS@ $(CFLAGS) $(CPPFLAGS) -I. -I$(INCDIR) \
> +               $(HDEFINES) @ac_libiberty_warn_cflags@ -D_GNU_SOURCE
>
>  # Just to make sure we don't use a built-in rule with VPATH
>  .c.$(objext):
> diff --git a/libiberty/configure b/libiberty/configure
> index b06cab2..c6758b0 100755
> --- a/libiberty/configure
> +++ b/libiberty/configure
> @@ -5130,6 +5130,9 @@ $as_echo "#define NEED_DECLARATION_ERRNO 1" >>confdefs.h
>  fi
>
>
> +$as_echo "#define _GNU_SOURCE 1" >>confdefs.h
> +
> +
>  # Determine sizes of some types.
>  # The cast to long int works around a bug in the HP C Compiler
>  # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
> diff --git a/libiberty/configure.ac b/libiberty/configure.ac
> index 922aa86..9f2d661 100644
> --- a/libiberty/configure.ac
> +++ b/libiberty/configure.ac
> @@ -272,6 +272,8 @@ AC_HEADER_TIME
>
>  libiberty_AC_DECLARE_ERRNO
>
> +AC_DEFINE(_GNU_SOURCE)
> +
>  # Determine sizes of some types.
>  AC_CHECK_SIZEOF([int])
>  AC_CHECK_SIZEOF([long])
> diff --git a/libiberty/floatformat.c b/libiberty/floatformat.c
> index 789fa05..4e73a2d 100644
> --- a/libiberty/floatformat.c
> +++ b/libiberty/floatformat.c
> @@ -19,7 +19,9 @@ along with this program; if not, write to the Free Software
>  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
> 02110-1301, USA.  */
>
>  /* This is needed to pick up the NAN macro on some systems.  */
> +#ifndef _GNU_SOURCE
>  #define _GNU_SOURCE
> +#endif
>
>  #ifdef HAVE_CONFIG_H
>  #include "config.h"
>
> On Tue, May 19, 2015 at 11:15 AM, Ian Lance Taylor <iant@google.com> wrote:
>> On Tue, May 19, 2015 at 11:08 AM, Yunlian Jiang <yunlian@google.com> wrote:
>>>
>>> I could do that and it make the compilation of libiberty passes.
>>> However, I  have some other problem when using clang to build gdb
>>> because of libiberty.
>>>
>>> Some c file from other component may include 'libiberty.h' which contains
>>> the following
>>>
>>> #if !HAVE_DECL_ASPRINTF
>>> /* Like sprintf but provides a pointer to malloc'd storage, which must
>>>    be freed by the caller.  */
>>>
>>> extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
>>> #endif
>>>
>>> The HAVE_DECL_ASPRINTF is defined in config.h under libiberty directory.
>>> If the other c file only includes libiberty.h and does not include the
>>> libiberty/config.h and
>>> at the same time, _GNU_SOURCE is defind, the same error happens.
>>
>> Probably if HAVE_DECL_ASPRINTF is not defined at all, we should not
>> declare asprintf in libiberty.h.
>>
>> Ian