Verify in configure that linking with perl's LDFLAGS actually works. If

perl lib dir is set, add 'use lib "/perl/lib/dir"' before each script
automatically.


git-svn-id: http://svn.irssi.org/repos/irssi/trunk@1287 dbcabf3a-b0e7-0310-adc4-f8d773084564

configure.in

@@ -392,11 +392,17 @@ dnl **
 
 if test "$want_perl" != "no"; then
 	AC_PATH_PROG(perlpath, perl)
-	AC_MSG_CHECKING(for Perl compile flags)
+	AC_MSG_CHECKING(for working Perl support)
+
+	if test "x$perlpath" = "x"; then
+       		perl_check_error="perl binary not found"
+	else
+		PERL_CFLAGS=`$perlpath -MExtUtils::Embed -e ccopts 2>/dev/null`
+	fi
 
-	PERL_CFLAGS=`$perlpath -MExtUtils::Embed -e ccopts 2>/dev/null`
 	if test "x$PERL_CFLAGS" = "x"; then
-		AC_MSG_RESULT([not found, building without Perl.])
+		perl_check_error="Error getting perl CFLAGS"
+		AC_MSG_RESULT([not found, building without Perl])
 		want_perl=no
 	else
 		PERL_LDFLAGS=`$perlpath -MExtUtils::Embed -e ldopts 2>/dev/null`
@@ -449,6 +455,25 @@ if test "$want_perl" != "no"; then
 		dnl * must not be in LIBADD line
 		PERL_LDFLAGS=`echo $PERL_LDFLAGS | $sedpath 's/-rdynamic\( \|$\)//'`
 
+		dnl * check that perl's ldflags actually work
+		AC_CACHE_VAL(irssi_cv_lib_perl_works, [
+			echo "main(){return 0;}" > conftest.c
+			$CC $CFLAGS $LDFLAGS $PERL_LDFLAGS conftest.c -o conftest 2> /dev/null > /dev/null
+			if test -s conftest; then
+				irssi_cv_lib_perl_works=yes
+			else
+				irssi_cv_lib_perl_works=no
+			fi
+		])
+
+		if test "x$irssi_cv_lib_perl_works" = "xno"; then
+			perl_check_error="Error linking with perl libraries: $PERL_LDFLAGS"
+			AC_MSG_RESULT([error linking with perl libraries, building without Perl])
+			want_perl=no
+		fi
+	fi
+
+	if test "x$want_perl" != "xno"; then
 		if test "x$want_perl" = "xstatic"; then
 			AC_MSG_RESULT(ok)
 		elif test "x$DYNALOADER_A" = "x"; then
@@ -686,7 +711,12 @@ if test "x$want_perl" = "xstatic"; then
 elif test "x$want_perl" = "xyes"; then
 	echo "Building with Perl support . : module"
 else
-	echo "Building with Perl support . : no"
+	if test "x$perl_check_error" = "x"; then
+		echo "Building with Perl support . : no"
+	else
+		echo "Building with Perl support . : NO!"
+		echo " - $perl_check_error"
+	fi
 fi
 
 if test "x$perl_mod_error" != "x"; then
@@ -701,12 +731,11 @@ if test "x$want_perl" = "xyes"; then
 	else
 		echo "Perl library directory ..... : $PERL_LIB_DIR"
 		if test "x$perl_lib_dir_given" != "xyes"; then
-			echo " - NOTE: This is automatically set to the same directory you gave with"
+			echo " - NOTE: This was automatically set to the same directory you gave with"
-			echo "   --prefix. Irssi's perl scripts do not work unless you also add"
+			echo "   --prefix. If you want the perl libraries to install to their 'correct'"
-			echo "   this directory to @INC (or do some other magic)."
+			echo "   path, you'll need to give --enable-perl= (nothing after '=') option"
-			echo "   *OR* what you might want to do instead, is to simply give --enable-perl="
+			echo "   to configure. Anyway, installing perl to this directory should work"
-			echo "   (nothing after '=') option to configure, and make install will install"
+			echo "   just as well.."
-			echo "   the Perl libraries to defaut directory."
 		fi
 	fi
 fi

src/perl/Makefile.am

@@ -15,6 +15,7 @@ perl.c: perl-signals-list.h
 
 INCLUDES = $(GLIB_CFLAGS) \
 	-DSCRIPTDIR=\""$(libdir)/irssi/scripts"\" \
+	-DPERL_LIB_DIR=\""$(PERL_LIB_DIR)"\" \
 	$(PERL_CFLAGS) \
 	-I$(top_srcdir)/src \
 	-I$(top_srcdir)/src/core

src/perl/perl.c

@@ -72,7 +72,7 @@ static void irssi_perl_start(void)
 		"  my $sub = <FH>;\n"
 		"  close FH;\n"
 		"\n"
-		"  my $eval = qq{package $package; sub handler { $sub; }};\n"
+		"  my $eval = qq{package $package; %s sub handler { $sub; }};\n"
 		"  {\n"
 		"      # hide our variables within this block\n"
 		"      my ($filename, $package, $sub);\n"
@@ -83,6 +83,7 @@ static void irssi_perl_start(void)
 		"  eval {$package->handler;};\n"
 		"  die $@ if $@;\n"
 		"}\n";
+	char *code, *use_code;
 
         perl_signals_start();
 	perl_sources = NULL;
@@ -91,7 +92,13 @@ static void irssi_perl_start(void)
 	perl_construct(my_perl);
 
 	perl_parse(my_perl, xs_init, 3, args, NULL);
-	perl_eval_pv(eval_file_code, TRUE);
+
+	use_code = *PERL_LIB_DIR == '\0' ? "" :
+                "use lib \""PERL_LIB_DIR"\";";
+
+        code = g_strdup_printf(eval_file_code, use_code);
+	perl_eval_pv(code, TRUE);
+        g_free(code);
 
         perl_common_init();
 }