From: Dan Willemsen <dwillemsen@google.com>
Date: Tue, 7 Jun 2016 23:55:57 +0000 (-0700)
Subject: Rewrite LDLIBS and SHARED_LIBRARIES
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=6731b495ca70c3cdd9b545780d2c014993b433da;p=android-x86%2Fbuild.git

Rewrite LDLIBS and SHARED_LIBRARIES

LOCAL_LDLIBS was the only correct way to use NDK libraries, but few used
it correctly. It also often got confused with LOCAL_LDFLAGS, so move the
flags to the correct variable.

For binaries that weren't using the NDK (empty LOCAL_SDK_VERSION), it
was never valid to use LOCAL_LDLIBS, as dependencies would not be
properly set up, and could lead to random build failures. So convert any
-l linker flags to using LOCAL_SHARED_LIBRARIES automatically.

For binaries built using the NDK (LOCAL_SDK_VERSION set), they were
required to use LOCAL_LDLIBS for prebuilt NDK libraries, otherwise they
would get headers and dependencies to the platform versions. Any
non-prebuilt LOCAL_LDLIBS would miss dependencies. So move the NDK
prebuilt libraries to LDLIBS from SHARED_LIBRARIES, and move everything
else to SHARED_LIBRARIES.

So now, for device modules, LOCAL_SHARED_LIBRARIES should always be
used, and we'll do the right thing. LOCAL_LDLIBS should only be used for
host libraries from the system.

Change-Id: Ide34c7afdcfb6507a378d45a42471729e489a9e0
---

diff --git a/core/binary.mk b/core/binary.mk
index d6445d4e1..c3bf45140 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -1133,6 +1133,34 @@ asm_objects += $(asm_objects_asm)
 endif
 
 
+####################################################
+## For NDK-built libraries, move LOCAL_SHARED_LIBRARY
+## references to my_ldlibs, so that we use the NDK
+## prebuilt library and headers for linking.
+####################################################
+ifndef LOCAL_IS_HOST_MODULE
+my_allowed_ldlibs :=
+ifdef LOCAL_SDK_VERSION
+  my_ndk_shared_libraries := $(filter $(addprefix lib,$(NDK_PREBUILT_SHARED_LIBRARIES)),$(my_shared_libraries))
+  my_shared_libraries := $(filter-out $(my_ndk_shared_libraries),$(my_shared_libraries))
+  my_ldlibs += $(patsubst lib%,-l%,$(my_ndk_shared_libraries))
+  my_ndk_shared_libraries :=
+  my_allowed_ldlibs := $(addprefix -l,$(NDK_PREBUILT_SHARED_LIBRARIES))
+endif
+
+# Sort ldlibs and ldflags between -l and other linker flags
+# We'll do this again later, since there are still changes happening, but that's fine.
+my_ldlib_flags := $(my_ldflags) $(my_ldlibs)
+my_ldlibs := $(filter -l%,$(my_ldlib_flags))
+my_ldflags := $(filter-out -l%,$(my_ldlib_flags))
+my_ldlib_flags :=
+
+# Move other ldlibs back to shared libraries
+my_shared_libraries += $(patsubst -l%,lib%,$(filter-out $(my_allowed_ldlibs),$(my_ldlibs)))
+my_ldlibs := $(filter $(my_allowed_ldlibs),$(my_ldlibs))
+endif
+
+
 ##########################################################
 ## Set up installed module dependency
 ## We cannot compute the full path of the LOCAL_SHARED_LIBRARIES for
@@ -1431,6 +1459,24 @@ ifneq (,$(filter 1 true,$(my_tidy_enabled)))
   endif
 endif
 
+# Move -l* entries from ldflags to ldlibs, and everything else to ldflags
+my_ldlib_flags := $(my_ldflags) $(my_ldlibs)
+my_ldlibs := $(filter -l%,$(my_ldlib_flags))
+my_ldflags := $(filter-out -l%,$(my_ldlib_flags))
+
+# One last verification check for ldlibs
+ifndef LOCAL_IS_HOST_MODULE
+my_allowed_ldlibs :=
+ifdef LOCAL_SDK_VERSION
+  my_allowed_ldlibs := $(addprefix -l,$(NDK_PREBUILT_SHARED_LIBRARIES))
+endif
+
+my_bad_ldlibs := $(filter-out $(my_allowed_ldlibs),$(my_ldlibs))
+ifneq ($(my_bad_ldlibs),)
+  $(error $(LOCAL_MODULE_MAKEFILE): $(LOCAL_MODULE): Bad LOCAL_LDLIBS entries: $(my_bad_ldlibs))
+endif
+endif
+
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_YACCFLAGS := $(LOCAL_YACCFLAGS)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_ASFLAGS := $(my_asflags)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_CONLYFLAGS := $(my_conlyflags)
diff --git a/core/config.mk b/core/config.mk
index 727a5a80a..6f693f5b0 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -781,6 +781,8 @@ endif
 RSCOMPAT_32BIT_ONLY_API_LEVELS := 8 9 10 11 12 13 14 15 16 17 18 19 20
 RSCOMPAT_NO_USAGEIO_API_LEVELS := 8 9 10 11 12 13
 
+NDK_PREBUILT_SHARED_LIBRARIES := android c dl EGL GLESv1_CM GLESv2 GLESv3 jnigraphics log mediandk m OpenMAXAL OpenSLES stdc++ vulkan z
+
 ifeq ($(JAVA_NOT_REQUIRED),true)
 # Remove java and tools from our path so that we make sure nobody uses them.
 unexport ANDROID_JAVA_HOME