- Add an AC macro to test linker flags.

- Test whether the linker supports --as-needed and if so,
  adds it to LDFLAGS

svn path=/trunk/; revision=29327

acinclude.m4

@@ -1642,6 +1642,36 @@ AC_DEFUN([AC_WIRESHARK_GEOIP_CHECK],
 	fi
 ])
 
+#AC_WIRESHARK_GCC_LDFLAGS_CHECK
+#
+# $1 : ldflag(s) to test
+#
+# The macro first determines if the compiler is GCC. Then compile with the
+# defined ldflags. The defined flags are added to LDFLAGS only if the
+# compilation succeeds.
+#
+AC_DEFUN([AC_WIRESHARK_GCC_LDFLAGS_CHECK],
+[GCC_OPTION="$1"
+AC_MSG_CHECKING(whether we can add $GCC_OPTION to LDFLAGS)
+if test "x$GCC" != "x"; then
+  LDFLAGS_saved="$CFLAGS"
+  LDFLAGS="$LDFLAGS $GCC_OPTION"
+  AC_LINK_IFELSE([
+    AC_LANG_SOURCE([[
+		main() { return; }
+                  ]])],
+                  [
+                    AC_MSG_RESULT(yes)
+                  ],
+                  [
+                    AC_MSG_RESULT(no)
+                    LDFLAGS="$LDFLAGS_saved"
+                  ])
+else
+  AC_MSG_RESULT(no)
+fi
+])
+
 #
 # AC_WIRESHARK_GCC_CFLAGS_CHECK
 #

configure.in

@@ -230,9 +230,20 @@ AC_ARG_ENABLE(extra-gcc-checks,
 		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wno-overlength-strings)
 #		AC_WIRESHARK_GCC_CFLAGS_CHECK(-fstrict-overflow -Wstrict-overflow=4)
 #		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wunreachable-code)
+#		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wunsafe-loop-optimizations)
 		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wno-long-long)
 		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wbad-function-cast)
 		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wcast-qual)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Waddress)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Warray-bounds)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wattributes)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wdeclaration-after-statement)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wdiv-by-zero)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wformat-security)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wignored-qualifiers)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wpragmas)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wredundant-decls)
+		AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wvla)
 		#
 		# epan/dissectors/packet-ncp2222.inc blocks this one
 		# for now.
@@ -260,6 +271,8 @@ AC_WIRESHARK_GCC_CFLAGS_CHECK(-Warray-bounds)
 AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wcast-align)
 AC_WIRESHARK_GCC_CFLAGS_CHECK(-Wformat-security)
 
+AC_WIRESHARK_GCC_LDFLAGS_CHECK([-Wl,--as-needed])
+
 #
 # If we're running gcc add '-D_U_="__attribute__((unused))"' to CFLAGS as well,
 # so we can use _U_ to flag unused function arguments and not get warnings