Re: [PATCH/RCF] autoconf: Check if <libintl.h> exists and set NO_GETTEXT

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On Tue, Jun 1, 2010, Ævar Arnfjörð Bjarmason wrote:
> On Tue, Jun 1, 2010 at 17:01, Jakub Narebski <jnareb@xxxxxxxxx> wrote:
> > [...]
> > Could you also provide change to configure.ac, so that ./configure
> > would detect if we have gettext installed or not?  Thanks in advance.
> 
> Here's a check that just checks if we have libintl.h similar to the
> existing checks for libgen.h and other headers.
> 
> Do you think this be adequate?

I'm not sure.  If NO_GETTEXT is used only to protect '#include <libintl.h>'
it might be enough.

> 
>  config.mak.in |    1 +
>  configure.ac  |    6 ++++++
>  2 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/config.mak.in b/config.mak.in
> index 0d4b64d..a15f3c1 100644
> --- a/config.mak.in
> +++ b/config.mak.in
> @@ -32,6 +32,7 @@ NO_CURL=@NO_CURL@
>  NO_EXPAT=@NO_EXPAT@
>  NO_LIBGEN_H=@NO_LIBGEN_H@
>  HAVE_PATHS_H=@HAVE_PATHS_H@
> +NO_GETTEXT=@NO_GETTEXT@
>  NEEDS_LIBICONV=@NEEDS_LIBICONV@
>  NEEDS_SOCKET=@NEEDS_SOCKET@
>  NEEDS_RESOLV=@NEEDS_RESOLV@

O.K.

> diff --git a/configure.ac b/configure.ac
> index 71038fc..7bebfd8 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -730,6 +730,12 @@ AC_CHECK_HEADER([paths.h],
>  [HAVE_PATHS_H=])
>  AC_SUBST(HAVE_PATHS_H)
>  #
> +# Define NO_GETTEXT if you don't have libintl.h
> +AC_CHECK_HEADER([libintl.h],
> +[NO_GETTEXT=],
> +[NO_GETTEXT=YesPlease])
> +AC_SUBST(NO_GETTEXT)
> +#
>  # Define NO_STRCASESTR if you don't have strcasestr.
>  GIT_CHECK_FUNC(strcasestr,
>  [NO_STRCASESTR=],

The getext documentation says that `gettext.m4' defines AM_GNU_GETTEXT
macro that tests for the presence of GNU gettext function family.

The complication is that `gettext.m4' might not exist, and then
AM_GNU_GETTEXT would be not defined.  So if we are to use
AM_GNU_GETTEXT, we should I guess protect it with m4_ifdef():

  m4_ifdef([AM_GNU_GETTEXT], [AM_GNU_GETTEXT([external])])

or something like that.  And of course we need to work around the fact
that AM_GNU_GETTEXT sets USE_NLS to either 'yes' or 'no' instead of
setting setting NO_GETTEXT to either non-empty or empty value.

Or we can do something similar to what we do for NEEDS_LIBICINV /
NO_ICONV, namely make ./configure compile simple test program using
gettext.

Cc-ed Ben Walton and David M. Syzdek: perhaps they can help with this
issue.
-- 
Jakub Narebski
Poland
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