[PATCH] Re: 1.7.9, libcharset missing from EXTLIBS

["Дилян Палаузов" <dilyan.palauzov@aegee.org>]

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The function locale_charset might appear in libiconv as local symbol.  In
this case linking with -lcharset delivers locale_charset, when the function
is exported from that library.  This patch defines a new Autoconf/make
variable CHARSET_LIB to contain the library exporting locale_charset and
fixes configure.ac to fill CHARSET_LIB with " -lcharset", when
locale_charset is not exported from libiconv, but is exported from
libcharset, and amends EXTLIBS to include CHARSET_LIB when HAVE_LIBCHARSET_H
is defined.

Signed-off-by: Дилян Палаузов <git-dpa@aegee.org>
---
 Makefile      |    6 ++++++
 config.mak.in |    1 +
 configure.ac  |   10 ++++++++++
 3 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index 87fb30a..571d864 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,11 @@ all::
 # FreeBSD can use either, but MinGW and some others need to use
 # libcharset.h's locale_charset() instead.
 #
+# Define CHARSET_LIB to contain the additional library exporting the symbol
+# locale_charset to link against.  configure.ac checks if locale_charset is
+# exported from libiconv, if not, it checks if locale_charset is
exported from
+# libcharset and defines then CHARSET_LIB to -lcharset .
+#
 # Define LIBC_CONTAINS_LIBINTL if your gettext implementation doesn't
 # need -lintl when linking.
 #
@@ -1698,6 +1703,7 @@ endif

 ifdef HAVE_LIBCHARSET_H
 	BASIC_CFLAGS += -DHAVE_LIBCHARSET_H
+	EXTLIBS +=$(CHARSET_LIB)
 endif

 ifdef HAVE_DEV_TTY
diff --git a/config.mak.in b/config.mak.in
index 10698c8..b2ba710 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -74,3 +74,4 @@ SNPRINTF_RETURNS_BOGUS=@SNPRINTF_RETURNS_BOGUS@
 NO_PTHREADS=@NO_PTHREADS@
 PTHREAD_CFLAGS=@PTHREAD_CFLAGS@
 PTHREAD_LIBS=@PTHREAD_LIBS@
+CHARSET_LIB=@CHARSET_LIB@
diff --git a/configure.ac b/configure.ac
index 630dbdd..1c21a5b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -836,6 +836,16 @@ AC_CHECK_HEADER([libcharset.h],
 [HAVE_LIBCHARSET_H=YesPlease],
 [HAVE_LIBCHARSET_H=])
 AC_SUBST(HAVE_LIBCHARSET_H)
+# Define CHARSET_LIB if libiconv does not export the locale_charset symbol
+# and libcharset does
+CHARSET_LIB=
+AC_CHECK_LIB([iconv], [locale_charset],
+       [],
+       [AC_CHECK_LIB([charset], [locale_charset],
+                     [CHARSET_LIB=" -lcharset"])
+       ]
+)
+AC_SUBST(CHARSET_LIB)
 #
 # Define NO_STRCASESTR if you don't have strcasestr.
 GIT_CHECK_FUNC(strcasestr,
-- 
1.7.9



On 12.02.2012 11:30, Junio C Hamano wrote:
> Дилян Палаузов  <dilyan.palauzov@aegee.org> writes:
> 
>> diff -u git-1.7.9.orig/config.mak.in git-1.7.9/config.mak.in
>> --- git-1.7.9.orig/config.mak.in        2012-01-27 20:51:04.000000000 +0000
>> +++ git-1.7.9/config.mak.in     2012-02-12 00:52:41.457968080 +0000
>> @@ -74,3 +74,4 @@
>>  NO_PTHREADS=@NO_PTHREADS@
>>  PTHREAD_CFLAGS=@PTHREAD_CFLAGS@
>>  PTHREAD_LIBS=@PTHREAD_LIBS@
>> +LINK_CHARSET=@LINK_CHARSET@
>> diff -u git-1.7.9.orig/configure.ac git-1.7.9/configure.ac
>> --- git-1.7.9.orig/configure.ac 2012-01-27 20:51:04.000000000 +0000
>> +++ git-1.7.9/configure.ac      2012-02-12 00:44:29.222967868 +0000
>> @@ -836,6 +836,18 @@
>>  [HAVE_LIBCHARSET_H=YesPlease],
>>  [HAVE_LIBCHARSET_H=])
>>  AC_SUBST(HAVE_LIBCHARSET_H)
>> +# Define LINK_LIBCHARSET if libiconv does not export the
> 
> Because the use of configure is optional in our build infrastructure, I
> wouldn't have objected if this comment were missing from configure.ac, but
> the new variable *must* be described in Makefile (see the top 250 lines or
> so of that file).
> 
> I also need to point out that LINK_LIBCHARSET does not sit very well with
> the way how existing Makefile variables are named. Perhaps make the new
> variable contain the necessary string ("-lcharset" in your case), and name
> it CHARSET_LIB or something?  By doing so, when we find a platform that
> has the necessary locale_charset() not in libcharset.{a,so} but somewhere
> else, e.g. libxyzzy.a, we can accomodate it with "CHARSET_LIB = -lxyzzy".
> 
> Thanks.  Also as Ævar pointed out, please do not forget to sign off your
> patch.

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