Prepare to run (select) tests during Emscripten build

...by e.g. executing generated Wasm code with node.  This requires check targets
to not be skipped unconditionally, unlike for other CROSS_COMPILING builds, so
introduce gb_CAN_EXECUTE_HOST_CODE to distinguish these cases.

Which revealed that some CppunitTest targets unconditionally used artefacts that
are covered by some ENABLE_WASM_STRIP_*, so made those uses conditional
accordingly (even though the resulting binaries might actually be dysfunctional,
lacking relevant parts; we'll fix that if and when we actually build and run
them).

Change-Id: I7144eeb908ede25358a3c8186198ac532de4d9f1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166931
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>

drawinglayer/CppunitTest_drawinglayer_processors.mk

@@ -16,7 +16,7 @@ $(eval $(call gb_CppunitTest_use_api,drawinglayer_processors,\
 
 $(eval $(call gb_CppunitTest_use_libraries,drawinglayer_processors, \
 	basegfx \
-	cppcanvas \
+	$(if $(ENABLE_WASM_STRIP_CANVAS),,cppcanvas) \
 	cppu \
 	cppuhelper \
 	sal \

solenv/gbuild/extensions/post_SpeedUpTargets.mk

@@ -9,6 +9,9 @@
 
 ifneq ($(CROSS_COMPILING),)
 gb_Module_add_targets_for_build :=
+endif
+
+ifeq ($(gb_CAN_EXECUTE_HOST_CODE),$(false))
 gb_Module_SKIPTARGETS := check coverage slowcheck screenshot subsequentcheck uicheck
 endif
 

solenv/gbuild/gbuild.mk

@@ -166,6 +166,14 @@ ifneq ($(strip $(ENVCFLAGSCXX)),)
 gb__ENV_CXXFLAGS := $(ENVCFLAGSCXX)
 endif
 
+ifeq ($(CROSS_COMPILING),)
+gb_CAN_EXECUTE_HOST_CODE := $(true)
+else ifeq ($(OS),EMSCRIPTEN)
+gb_CAN_EXECUTE_HOST_CODE := $(true)
+else
+gb_CAN_EXECUTE_HOST_CODE := $(false)
+endif
+
 include $(GBUILDDIR)/ExternalExecutable.mk
 include $(GBUILDDIR)/TargetLocations.mk
 

solenv/gbuild/platform/EMSCRIPTEN_INTEL_GCC.mk

@@ -92,8 +92,6 @@ $(call gb_LinkTarget_add_auxtargets,$(2),\
 
 endef
 
-gb_SUPPRESS_TESTS := $(true)
-
 define gb_Library_get_rpath
 endef
 

writerperfect/CppunitTest_writerperfect_epubexport.mk

@@ -30,7 +30,7 @@ $(eval $(call gb_CppunitTest_use_libraries,writerperfect_epubexport, \
 ))
 
 $(eval $(call gb_CppunitTest_use_externals,writerperfect_epubexport,\
-    epubgen \
+    $(if $(ENABLE_WASM_STRIP_EPUB),,epubgen) \
     libxml2 \
     revenge \
 ))