Add special cases for builds that cannot switch to ART prebuilts.

Cherry-picked from http://ag/15234811.

Test: env TARGET_PRODUCT=mainline_modules_x86_64 \
        build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns true with http://ag/15234812 in internal
Test: env TARGET_PRODUCT=module_arm build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns true with http://ag/15234812
Test: env TARGET_PRODUCT=cf_arm64_phone build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns true with http://ag/15234812 in internal
Test: env TARGET_PRODUCT=cf_x86_64_phone build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns false with http://ag/15234812 in internal
Test: env TARGET_PRODUCT=cf_x86_phone build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns false with http://ag/15234812 in internal
Test: env TARGET_PRODUCT=bonito build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns false with http://ag/15234812 in internal
Test: env TARGET_PRODUCT=aosp_flame build/soong/soong_ui.bash \
        --dumpvar-mode SOONG_CONFIG_art_module_source_build
  returns true with http://ag/15234812
Bug: 172480615
Change-Id: I544a0cfc9dfe6d738f75e60b7fec6d57f2b51d22
Merged-In: I544a0cfc9dfe6d738f75e60b7fec6d57f2b51d22
diff --git a/core/android_soong_config_vars.mk b/core/android_soong_config_vars.mk
index 04a055d..64a6449 100644
--- a/core/android_soong_config_vars.mk
+++ b/core/android_soong_config_vars.mk
@@ -39,6 +39,10 @@
 ifneq (,$(findstring .android.art,$(TARGET_BUILD_APPS)))
   # Build ART modules from source if they are listed in TARGET_BUILD_APPS.
   SOONG_CONFIG_art_module_source_build := true
+else ifeq (,$(filter-out modules_% mainline_modules_%,$(TARGET_PRODUCT)))
+  # Always build from source for the module targets. This ought to be covered by
+  # the TARGET_BUILD_APPS check above, but there are test builds that don't set it.
+  SOONG_CONFIG_art_module_source_build := true
 else ifneq (,$(filter true,$(NATIVE_COVERAGE) $(CLANG_COVERAGE)))
   # Always build ART APEXes from source in coverage builds since the prebuilts
   # aren't built with instrumentation.
@@ -51,6 +55,13 @@
   # Fuchsia picks out ART internal packages that aren't available in the
   # prebuilt.
   SOONG_CONFIG_art_module_source_build := true
+else ifeq (,$(filter x86 x86_64,$(HOST_CROSS_ARCH)))
+  # We currently only provide prebuilts for x86 on host. This skips prebuilts in
+  # cuttlefish builds for ARM servers.
+  SOONG_CONFIG_art_module_source_build := true
+else ifneq (,$(filter dex2oatds dex2oats,$(PRODUCT_HOST_PACKAGES)))
+  # Some products depend on host tools that aren't available as prebuilts.
+  SOONG_CONFIG_art_module_source_build := true
 else ifeq (,$(filter com.google.android.art,$(PRODUCT_PACKAGES)))
   # TODO(b/192006406): There is currently no good way to control which prebuilt
   # APEX (com.google.android.art or com.android.art) gets picked for deapexing