Change to config libbfd detection.

Include all used functions in test script, this is to catch
unsatisfied dependency link errors.
Try to compile with libiberty and then also with libintl if the
initial test fails.
Log the executed commands at level 2, for consistency with other
config test compiles.

config.lib

@@ -1442,6 +1442,34 @@ make_compiler_cflags() {
 	eval "$5=\"$features\""
 }
 
+test_compile_libbfd() {
+	log 2 "executing $cc_host $CFLAGS $LDFLAGS -o tmp.config.bfd -x c++ - $1"
+	"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.bfd -x c++ - $1 2> /dev/null << EOL
+		#define PACKAGE 1
+		#define PACKAGE_VERSION 1
+		#include <bfd.h>
+		#include <unistd.h>
+		int main() {
+			bfd_init();
+			bfd *abfd = bfd_openr("test", "test");
+			bfd_check_format(abfd, bfd_object);
+			bfd_get_file_flags(abfd);
+			bfd_map_over_sections(abfd, (void (*)(bfd*, asection*, void*)) 0, (void *) 0);
+			asymbol *syms = 0;
+			long symcount = bfd_read_minisymbols(abfd, false, (void**) &syms, (unsigned int *) 0);
+			bfd_get_section_flags(abfd, (asection*) 0);
+			bfd_get_section_vma(abfd, (asection*) 0);
+			bfd_section_size(abfd, (asection*) 0);
+			bfd_find_nearest_line(abfd, (asection*) 0, (asymbol **) 0, (bfd_vma) 0, (const char **) 0, (const char **) 0, (unsigned int *) 0);
+			return (int) symcount;
+		}
+EOL
+	ret=$?
+	rm -f tmp.config.bfd
+	log 2 "  exit code $ret"
+	return $ret
+}
+
 make_cflags_and_ldflags() {
 	# General CFlags for BUILD
 	CFLAGS_BUILD="$CFLAGS_BUILD"
@@ -1567,6 +1595,7 @@ make_cflags_and_ldflags() {
 		LIBS="$LIBS -lpthread"
 	fi
 	if [ "$os" != "CYGWIN" ] && [ "$os" != "HAIKU" ] && [ "$os" != "MINGW" ] && [ "$os" != "MORPHOS" ] && [ "$os" != "OSX" ] && [ "$os" != "DOS" ] && [ "$os" != "WINCE" ] && [ "$os" != "PSP" ] && [ "$os" != "OS2" ]; then
+		log 2 "executing $cc_host $CFLAGS $LDFLAGS -o tmp.config.libdl -x c++ - -ldl"
 		"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.libdl -x c++ - -ldl 2> /dev/null << EOL
 			#include <dlfcn.h>
 			int main() {
@@ -1574,43 +1603,42 @@ make_cflags_and_ldflags() {
 				return dladdr(0, &info);
 			}
 EOL
-		if [ $? -ne 0 ]; then
+		ret=$?
+		rm -f tmp.config.libdl
+		log 2 "  exit code $ret"
+		if [ $ret -ne 0 ]; then
 			log 1 "checking libdl... no"
 		else
 			log 1 "checking libdl... found"
 			LIBS="$LIBS -ldl"
 			CFLAGS="$CFLAGS -DWITH_DL"
 		fi
-		rm -f tmp.config.libdl
 
 		if [ "$with_libbfd" = "1" ]; then
-			"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.bfd -x c++ - -lbfd 2> /dev/null << EOL
+			if test_compile_libbfd "-lbfd -lz"; then
-				#define PACKAGE 1
+				LIBBFD_LIBS="-lbfd -lz"
-				#define PACKAGE_VERSION 1
+			elif test_compile_libbfd "-lbfd -liberty -lz"; then
-				#include <bfd.h>
+				LIBBFD_LIBS="-lbfd -liberty -lz"
-				int main() {
+			elif test_compile_libbfd "-lbfd -liberty -lintl -lz"; then
-					bfd_init();
+				LIBBFD_LIBS="-lbfd -liberty -lintl -lz"
-					unsigned int size;
-					asymbol *syms = 0;
-					long symcount = bfd_read_minisymbols((bfd *) 0, false, (void**) &syms, &size);
-					return 0;
-				}
-EOL
-			if [ $? -ne 0 ]; then
-				log 1 "checking libbfd... no"
 			else
+				LIBBFD_LIBS=
+			fi
+			if [ -n "$LIBBFD_LIBS" ]; then
 				log 1 "checking libbfd... found"
-				LIBS="$LIBS -lbfd"
+				LIBS="$LIBS $LIBBFD_LIBS"
 				CFLAGS="$CFLAGS -DWITH_BFD"
 				if [ $enable_debug -lt 1 ] && [ "$with_bfd_extra_debug" = "1" ]; then
 					CFLAGS="$CFLAGS -g1"
 				fi
+			else
+				log 1 "checking libbfd... no"
 			fi
-			rm -f tmp.config.bfd
 		fi
 	fi
 
 	if [ "$os" = "MINGW" ]; then
+		log 2 "executing $cc_host $CFLAGS $LDFLAGS -o tmp.config.dbghelp -x c++ -"
 		"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.dbghelp -x c++ - 2> /dev/null << EOL
 			#include <windows.h>
 			#include <dbghelp.h>
@@ -1622,43 +1650,34 @@ EOL
 				return 0;
 			}
 EOL
-		if [ $? -ne 0 ]; then
+		ret=$?
+		rm -f tmp.config.dbghelp
+		log 2 "  exit code $ret"
+		if [ $ret -ne 0 ]; then
 			log 1 "checking dbghelp... no"
 		else
 			log 1 "checking dbghelp... found"
 			CFLAGS="$CFLAGS -DWITH_DBGHELP"
 
 			if [ "$with_libbfd" = "1" ]; then
-				"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.bfd -x c++ - -lbfd -liberty -lintl 2> /dev/null << EOL
+				test_compile_libbfd "-lbfd -liberty -lintl -lz"
-					#define PACKAGE 1
-					#define PACKAGE_VERSION 1
-					#include <bfd.h>
-					int main() {
-						bfd_init();
-						unsigned int size;
-						asymbol *syms = 0;
-						long symcount = bfd_read_minisymbols((bfd *) 0, false, (void**) &syms, &size);
-						return 0;
-					}
-EOL
 				if [ $? -ne 0 ]; then
 					log 1 "checking libbfd... no"
 				else
 					log 1 "checking libbfd... found"
-					LIBS="$LIBS -lbfd -liberty -lintl"
+					LIBS="$LIBS -lbfd -liberty -lintl -lz"
 					CFLAGS="$CFLAGS -DWITH_BFD"
 
 					if [ $enable_debug -lt 1 ] && [ "$with_bfd_extra_debug" = "1" ]; then
 						CFLAGS="$CFLAGS -g1"
 					fi
 				fi
-				rm -f tmp.config.bfd
 			fi
 		fi
-		rm -f tmp.config.dbghelp
 	fi
 
 	if [ "$os" != "CYGWIN" ] && [ "$os" != "HAIKU" ] && [ "$os" != "MORPHOS" ] && [ "$os" != "OSX" ] && [ "$os" != "DOS" ] && [ "$os" != "WINCE" ] && [ "$os" != "PSP" ] && [ "$os" != "OS2" ]; then
+		log 2 "executing $cc_host $CFLAGS $LDFLAGS -o tmp.config.demangle -x c++ - -lstdc++"
 		"$cc_host" $CFLAGS $LDFLAGS -o tmp.config.demangle -x c++ - -lstdc++ 2> /dev/null << EOL
 			#include <cxxabi.h>
 			int main() {
@@ -1667,13 +1686,15 @@ EOL
 				return 0;
 			}
 EOL
-		if [ $? -ne 0 ]; then
+		ret=$?
+		rm -f tmp.config.demangle
+		log 2 "  exit code $ret"
+		if [ $ret -ne 0 ]; then
 			log 1 "checking abi::__cxa_demangle... no"
 		else
 			log 1 "checking abi::__cxa_demangle... found"
 			CFLAGS="$CFLAGS -DWITH_DEMANGLE"
 		fi
-		rm -f tmp.config.demangle
 	fi
 
 	if [ "$os" != "CYGWIN" ] && [ "$os" != "HAIKU" ] && [ "$os" != "MINGW" ] && [ "$os" != "DOS" ] && [ "$os" != "WINCE" ]; then