vim: fix gettext check

Fixes http://autobuild.buildroot.net/results/21b5a910e6a27fa1cb12d0002ffed7e6ed9d6c83/

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/vim/vim-0001-fix-nls-check.patch

@@ -0,0 +1,120 @@
+configure: use minimal LIBS during gettext check
+
+In some configurations, vim fails to link correctly with messages such as:
+edit.c:(.text+0x1614): undefined reference to `libintl_gettext'
+
+In particular, this has been seen by the buildroot autobuilds (see [1]) but
+has also been reported at [2] and [3].
+
+In the bad case, the configure script says:
+checking for NLS... gettext() works
+In the good case, it says:
+checking for NLS... gettext() works with -lintl
+
+In the bad case, the system has libelf, vim detects that and takes it along
+in $LIBS. Libelf needs libintl on this system, and so linking the test
+program with -lelf will automatically take -lintl too. This causes configure
+to think gettext() does not need libintl, while in reality it does.
+
+In the good case, libelf is not present and thus not used. The first
+configure test for gettext fails, and then configure retries with -lintl
+(which succeeds).
+
+Until now, there isn't really a problem. In both cases, you could link
+correctly. In the 'bad' case, libintl is implicitly taken through libelf, in
+the second case it is explicitly taken.
+
+The real problem occurs because configure also tests whether the linker
+supports --as-needed and uses it when possible, instead of the link.sh
+script. However, --as-needed seems to cause libintl NOT to be taken in the
+bad case, causing the undefined references to libintl_gettext.
+
+This patch changes the configure script so that the gettext check does not
+use additional libraries such as libelf. The test program is linked either
+with nothing, or with libintl alone. This will cause libintl to
+be added explicitly to LIBS, when needed.
+
+[1] http://autobuild.buildroot.net/results/21b5a910e6a27fa1cb12d0002ffed7e6ed9d6c83/
+[2] http://lists.freebsd.org/pipermail/freebsd-ports-bugs/2012-November/243930.html
+[3] http://lists.freebsd.org/pipermail/freebsd-ports-bugs/2012-May/234184.html
+
+
+Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
+Upstream-status: accepted (http://article.gmane.org/gmane.editors.vim.devel/43528)
+
+---
+ src/auto/configure |  11 ++++++-----
+ src/configure.in   |  13 +++++++++----
+ 2 files changed, 15 insertions(+), 9 deletions(-)
+
+diff --git a/src/auto/configure b/src/auto/configure
+--- a/src/auto/configure
++++ b/src/auto/configure
+@@ -12271,6 +12271,8 @@ fi
+   if test -f po/Makefile; then
+     have_gettext="no"
+     if test -n "$MSGFMT"; then
++      olibs=$LIBS
++      LIBS=""
+       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ #include <libintl.h>
+@@ -12284,10 +12286,9 @@ gettext("Test");
+ _ACEOF
+ if ac_fn_c_try_link "$LINENO"; then :
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: gettext() works" >&5
+-$as_echo "gettext() works" >&6; }; have_gettext="yes"
+-else
+-  olibs=$LIBS
+-	  LIBS="$LIBS -lintl"
++$as_echo "gettext() works" >&6; }; have_gettext="yes"; LIBS=$olibs;
++else
++	  LIBS="-lintl"
+ 	  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ #include <libintl.h>
+@@ -12301,7 +12302,7 @@ gettext("Test");
+ _ACEOF
+ if ac_fn_c_try_link "$LINENO"; then :
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: gettext() works with -lintl" >&5
+-$as_echo "gettext() works with -lintl" >&6; }; have_gettext="yes"
++$as_echo "gettext() works with -lintl" >&6; }; have_gettext="yes"; LIBS="$olibs -lintl";
+ else
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: gettext() doesn't work" >&5
+ $as_echo "gettext() doesn't work" >&6; };
+diff --git a/src/configure.in b/src/configure.in
+--- a/src/configure.in
++++ b/src/configure.in
+@@ -3484,6 +3484,9 @@ if test "$MANDEF" = "man -s"; then
+ fi
+ 
+ dnl Check if gettext() is working and if it needs -lintl
++dnl We take care to base this on an empty LIBS: on some systems libelf would be
++dnl in LIBS and implicitly take along libintl. The final LIBS would then not
++dnl contain libintl, and the link step would fail due to -Wl,--as-needed.
+ AC_MSG_CHECKING(--disable-nls argument)
+ AC_ARG_ENABLE(nls,
+ 	[  --disable-nls           Don't support NLS (gettext()).], ,
+@@ -3502,16 +3505,18 @@ if test "$enable_nls" = "yes"; then
+   if test -f po/Makefile; then
+     have_gettext="no"
+     if test -n "$MSGFMT"; then
++      olibs=$LIBS
++      LIBS=""
+       AC_TRY_LINK(
+ 	[#include <libintl.h>],
+ 	[gettext("Test");],
+-	AC_MSG_RESULT([gettext() works]); have_gettext="yes",
+-	  olibs=$LIBS
+-	  LIBS="$LIBS -lintl"
++	AC_MSG_RESULT([gettext() works]); have_gettext="yes"; LIBS=$olibs,
++	  LIBS="-lintl"
+ 	  AC_TRY_LINK(
+ 	      [#include <libintl.h>],
+ 	      [gettext("Test");],
+-	      AC_MSG_RESULT([gettext() works with -lintl]); have_gettext="yes",
++	      AC_MSG_RESULT([gettext() works with -lintl]); have_gettext="yes";
++	      LIBS="$olibs -lintl",
+ 	      AC_MSG_RESULT([gettext() doesn't work]);
+ 	      LIBS=$olibs))
+     else