From 42669e6dc72a1a3678d999c827671cdb9aebee15 Mon Sep 17 00:00:00 2001
From: Colin Cross <ccross@android.com>
Date: Mon, 30 Apr 2018 15:59:16 -0700
Subject: [PATCH] Allow Soong to export multiple proguard flags files

Soong uses lists of proguard flags files from dependencies instead
of a single concatenated file.  Allow Soong to pass the list to
make, which will concatenate it.

Move the check inside ifdef LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE
in case Soong exports an Android library with an empty
LOCAL_SOONG_EXPORT_PROGUARD_FLAGS.

Bug: 73724997
Test: m checkbuild
Change-Id: Ia8f229ec5f9fc99a23bd471dfa70c9de7316de94
---
 core/soong_java_prebuilt.mk | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index 96ff37626..3773c0731 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -40,21 +40,26 @@ ifdef LOCAL_SOONG_JACOCO_REPORT_CLASSES_JAR
     $(intermediates.COMMON)/jacoco-report-classes.jar)
 endif
 
-ifdef LOCAL_SOONG_EXPORT_PROGUARD_FLAGS
-  $(eval $(call copy-one-file,$(LOCAL_SOONG_EXPORT_PROGUARD_FLAGS),\
-    $(intermediates.COMMON)/export_proguard_flags))
-  $(call add-dependency,$(LOCAL_BUILT_MODULE),\
-    $(intermediates.COMMON)/export_proguard_flags)
-endif
-
 ifdef LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE
-my_res_package := $(intermediates.COMMON)/package-res.apk
+  my_res_package := $(intermediates.COMMON)/package-res.apk
 
-$(my_res_package): $(LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE)
+  $(my_res_package): $(LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE)
 	@echo "Copy: $@"
 	$(copy-file-to-target)
 
-$(call add-dependency,$(LOCAL_BUILT_MODULE),$(my_res_package))
+  $(call add-dependency,$(LOCAL_BUILT_MODULE),$(my_res_package))
+
+  my_proguard_flags := $(intermediates.COMMON)/export_proguard_flags
+  $(my_proguard_flags): $(LOCAL_SOONG_EXPORT_PROGUARD_FLAGS)
+	@echo "Export proguard flags: $@"
+	rm -f $@
+	touch $@
+	for f in $+; do \
+		echo -e "\n# including $$f" >>$@; \
+		cat $$f >>$@; \
+	done
+
+  $(call add-dependency,$(LOCAL_BUILT_MODULE),$(my_proguard_flags))
 
 endif # LOCAL_SOONG_RESOURCE_EXPORT_PACKAGE