Fix build when boost-libs is compiled with a newer (> 4.2 from base) gcc.

LyX originally uses the AC_CHECK_LIB macro to check for boost, however
this macro always calls a C compiler, even to check for a C++ library
such as boost. This made the test program built for this check to
always fail to link when boost was compiled witha recent enough
compiler.

A fix was submitted upstream [1], and this patch needs to be applied
meanwhile.

[1] http://article.gmane.org/gmane.editors.lyx.devel/138405

Reported by:	avg
Approved by:	avilla (mentor)

1 files changed, 103 insertions, 0 deletions

diff --git a/print/lyx/files/patch-configure b/print/lyx/files/patch-configure
new file mode 100644
index 000000000000..7bb03559faf7
--- /dev/null
+++ b/print/lyx/files/patch-configure
@@ -0,0 +1,103 @@
+--- configure.orig	2011-09-12 19:17:15.000000000 -0300
++++ configure	2011-09-12 19:17:40.000000000 -0300
+@@ -7307,73 +7317,56 @@
+ 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $lyx_cv_with_included_boost" >&5
+ $as_echo "$lyx_cv_with_included_boost" >&6; }
+ 	if test x$lyx_cv_with_included_boost != xyes ; then
+-		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lboost_signals" >&5
+-$as_echo_n "checking for main in -lboost_signals... " >&6; }
+-if test "${ac_cv_lib_boost_signals_main+set}" = set; then :
+-  $as_echo_n "(cached) " >&6
+-else
+-  ac_check_lib_save_LIBS=$LIBS
+-LIBS="-lboost_signals -lm $LIBS"
+-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+-/* end confdefs.h.  */
++		ac_ext=cpp
++ac_cpp='$CXXCPP $CPPFLAGS'
++ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
++ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
++ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+ 
++		SAVED_LDFLAGS=$LDFLAGS
+ 
++		LDFLAGS="$SAVED_LDFLAGS -lboost_signals -lm"
++		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
++/* end confdefs.h.  */
++#include <boost/signal.hpp>
+ int
+ main ()
+ {
+-return main ();
++boost::signal<void ()> s;
+   ;
+   return 0;
+ }
+ _ACEOF
+-if ac_fn_c_try_link "$LINENO"; then :
+-  ac_cv_lib_boost_signals_main=yes
+-else
+-  ac_cv_lib_boost_signals_main=no
++if ac_fn_cxx_try_link "$LINENO"; then :
++  lyx_boost_underscore=yes
+ fi
+ rm -f core conftest.err conftest.$ac_objext \
+     conftest$ac_exeext conftest.$ac_ext
+-LIBS=$ac_check_lib_save_LIBS
+-fi
+-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_boost_signals_main" >&5
+-$as_echo "$ac_cv_lib_boost_signals_main" >&6; }
+-if test "x$ac_cv_lib_boost_signals_main" = x""yes; then :
+-  lyx_boost_underscore=yes
+-fi
+-
+-		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lboost_signals-mt" >&5
+-$as_echo_n "checking for main in -lboost_signals-mt... " >&6; }
+-if test "${ac_cv_lib_boost_signals_mt_main+set}" = set; then :
+-  $as_echo_n "(cached) " >&6
+-else
+-  ac_check_lib_save_LIBS=$LIBS
+-LIBS="-lboost_signals-mt -lm $LIBTHREAD $LIBS"
+-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
++		LDFLAGS="$SAVED_LDFLAGS -lboost_signals-mt -lm $LIBTHREAD"
++		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+-
+-
++#include <boost/signal.hpp>
+ int
+ main ()
+ {
+-return main ();
++boost::signal<void ()> s;
+   ;
+   return 0;
+ }
+ _ACEOF
+-if ac_fn_c_try_link "$LINENO"; then :
+-  ac_cv_lib_boost_signals_mt_main=yes
+-else
+-  ac_cv_lib_boost_signals_mt_main=no
++if ac_fn_cxx_try_link "$LINENO"; then :
++  lyx_boost_underscore_mt=yes
+ fi
+ rm -f core conftest.err conftest.$ac_objext \
+     conftest$ac_exeext conftest.$ac_ext
+-LIBS=$ac_check_lib_save_LIBS
+-fi
+-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_boost_signals_mt_main" >&5
+-$as_echo "$ac_cv_lib_boost_signals_mt_main" >&6; }
+-if test "x$ac_cv_lib_boost_signals_mt_main" = x""yes; then :
+-  lyx_boost_underscore_mt=yes
+-fi
++
++		LDFLAGS=$SAVED_LDFLAGS
++		ac_ext=c
++ac_cpp='$CPP $CPPFLAGS'
++ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
++ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
++ac_compiler_gnu=$ac_cv_c_compiler_gnu
++
+ 
+ 		if test x$lyx_boost_underscore_mt = xyes ; then
+ 			BOOST_MT="-mt"