allow LDFLAGS from gbuild to be selective too

Just like CXXFLAGS can be controlled using --enable-selective-debuginfo.
Non-debug libraries can be debug-stripped this way, which can save quite
some disk space with those cppunittests which just include all .o's from sw/sc.

Change-Id: Ib947f76f535161e4eef1421a5539df5e25fa4042

solenv/gbuild/CppunitTest.mk

@@ -102,7 +102,7 @@ $(call gb_CppunitTest__CppunitTest_impl,$(1),$(call gb_CppunitTest__get_linktarg
 endef
 
 define gb_CppunitTest__CppunitTest_impl
-$(call gb_LinkTarget_LinkTarget,$(2))
+$(call gb_LinkTarget_LinkTarget,$(2),CppunitTest_$(1))
 $(call gb_LinkTarget_set_targettype,$(2),CppunitTest)
 $(call gb_LinkTarget_add_libs,$(2),$(gb_STDLIBS))
 $(call gb_LinkTarget_add_defs,$(2),\

solenv/gbuild/Executable.mk

@@ -52,7 +52,7 @@ $(call gb_Executable__Executable_impl,$(1),Executable/$(1)$(gb_Executable_EXT))
 endef
 
 define gb_Executable__Executable_impl
-$(call gb_LinkTarget_LinkTarget,$(2))
+$(call gb_LinkTarget_LinkTarget,$(2),Executable_$(1))
 $(call gb_LinkTarget_set_targettype,$(2),Executable)
 $(call gb_LinkTarget_add_libs,$(2),$(gb_STDLIBS))
 $(call gb_Executable_get_target,$(1)) : $(call gb_LinkTarget_get_target,$(2)) \

solenv/gbuild/Library.mk

@@ -66,7 +66,7 @@ $(call gb_Library__Library_impl,$(1),$(call gb_Library_get_linktargetname,$(1)))
 endef
 
 define gb_Library__Library_impl
-$(call gb_LinkTarget_LinkTarget,$(2))
+$(call gb_LinkTarget_LinkTarget,$(2),Library_$(1))
 $(call gb_LinkTarget_set_targettype,$(2),Library)
 $(call gb_LinkTarget_add_libs,$(2),$(gb_STDLIBS))
 $(call gb_LinkTarget_add_defs,$(2),\

solenv/gbuild/LinkTarget.mk

@@ -47,12 +47,19 @@ gb_LinkTarget__debug_enabled = \
 gb_LinkTarget__get_debugcflags=$(if $(call gb_LinkTarget__debug_enabled,$(1)),$(gb_COMPILERNOOPTFLAGS) $(gb_DEBUG_CFLAGS),$(gb_COMPILEROPTFLAGS))
 gb_LinkTarget__get_debugcxxflags=$(if $(call gb_LinkTarget__debug_enabled,$(1)),$(gb_COMPILERNOOPTFLAGS) $(gb_DEBUG_CFLAGS) $(gb_DEBUG_CXXFLAGS),$(gb_COMPILEROPTFLAGS))
 
+# similar for LDFLAGS, use linker optimization flags in non-debug case,
+# but moreover strip debug from libraries for which debuginfo is not wanted
+# (some libraries reuse .o files from other libraries, notably unittests)
+gb_LinkTarget__get_stripldflags=$(if $(call gb_LinkTarget__debug_enabled,$(1)),,$(gb_LINKERSTRIPDEBUGFLAGS))
+gb_LinkTarget__get_debugldflags=$(if $(call gb_LinkTarget__debug_enabled,$(1)),,$(gb_LINKEROPTFLAGS) $(call gb_LinkTarget__get_stripldflags,$(1)))
+
 # generic cflags/cxxflags to use (optimization flags, debug flags)
 # user supplied CFLAGS/CXXFLAGS override default debug/optimization flags
 gb_LinkTarget__get_cflags=$(if $(CFLAGS),$(CFLAGS),$(call gb_LinkTarget__get_debugcflags,$(1)))
 gb_LinkTarget__get_objcflags=$(if $(OBJCFLAGS),$(OBJCFLAGS),$(call gb_LinkTarget__get_debugcflags,$(1)))
 gb_LinkTarget__get_cxxflags=$(if $(CXXFLAGS),$(CXXFLAGS),$(call gb_LinkTarget__get_debugcxxflags,$(1)))
 gb_LinkTarget__get_objcxxflags=$(if $(OBJCXXFLAGS),$(OBJCXXFLAGS),$(call gb_LinkTarget__get_debugcxxflags,$(1)))
+gb_LinkTarget__get_ldflags=$(if $(LDFLAGS),$(LDFLAGS),$(call gb_LinkTarget__get_debugldflags,$(1)))
 
 # Overview of dependencies and tasks of LinkTarget
 #
@@ -508,7 +515,7 @@ $(call gb_LinkTarget_get_headers_target,$(1)) \
 $(call gb_LinkTarget_get_target,$(1)) : INCLUDE := $$(gb_LinkTarget_INCLUDE)
 $(call gb_LinkTarget_get_headers_target,$(1)) \
 $(call gb_LinkTarget_get_target,$(1)) : INCLUDE_STL := $$(gb_LinkTarget_INCLUDE_STL)
-$(call gb_LinkTarget_get_target,$(1)) : T_LDFLAGS := $$(gb_LinkTarget_LDFLAGS) $(if $(LDFLAGS),$(LDFLAGS),$(gb_LINKEROPTFLAGS))
+$(call gb_LinkTarget_get_target,$(1)) : T_LDFLAGS := $$(gb_LinkTarget_LDFLAGS) $(call gb_LinkTarget__get_ldflags,$(2))
 $(call gb_LinkTarget_get_target,$(1)) : LINKED_LIBS :=
 $(call gb_LinkTarget_get_target,$(1)) : LINKED_STATIC_LIBS :=
 $(call gb_LinkTarget_get_target,$(1)) : LIBS :=

solenv/gbuild/StaticLibrary.mk

@@ -59,7 +59,7 @@ $(call gb_StaticLibrary__StaticLibrary_impl,$(1),$(call gb_StaticLibrary_get_lin
 endef
 
 define gb_StaticLibrary__StaticLibrary_impl
-$(call gb_LinkTarget_LinkTarget,$(2))
+$(call gb_LinkTarget_LinkTarget,$(2),StaticLibrary_$(1))
 $(call gb_LinkTarget_set_targettype,$(2),StaticLibrary)
 $(call gb_StaticLibrary_get_target,$(1)) : $(call gb_LinkTarget_get_target,$(2)) \
 	| $(dir $(call gb_StaticLibrary_get_target,$(1))).dir

solenv/gbuild/platform/unxgcc.mk

@@ -156,6 +156,8 @@ endif
 gb_COMPILEROPTFLAGS := $(gb_COMPILERDEFAULTOPTFLAGS)
 gb_COMPILERNOOPTFLAGS := -O0
 
+gb_LINKERSTRIPDEBUGFLAGS := -Wl,-S
+
 # LinkTarget class
 
 define gb_LinkTarget__get_rpath_for_layer