linker: add -Wl,--exclude-libs,ALL to LDFLAGS
The linker is essentially a shared library, and incorporates
it's own copy of libc. Even though it's unnecessary, currently
/system/bin/linker is exporting various libc symbols (only to
apps which explicitly dlopen /system/bin/linker)
Add --exclude-libs,ALL, which tells the static linker to mark
all of the imported libc symbols as hidden. This reduces the
size of /system/bin/linker from 92K to 67K with no obvious
loss in functionality.
$ adb shell ls -l /system/bin/linker
-rwxrwxrwx root root 92260 2013-01-16 16:52 linker
$ adb shell ls -l /system/bin/linker
-rwxrwxrwx root root 67660 2013-01-16 16:49 linker
Documentation on exclude-libs can be found at
http://sourceware.org/binutils/docs-2.21/ld/Options.html
Change-Id: I4508287770e4b7a845def2e6b4af969f9c866c6a
diff --git a/linker/Android.mk b/linker/Android.mk
index 5fccf9b..c85b09e 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -17,7 +17,7 @@
linker_phdr.cpp \
rt.cpp
-LOCAL_LDFLAGS := -shared
+LOCAL_LDFLAGS := -shared -Wl,--exclude-libs,ALL
LOCAL_CFLAGS += -fno-stack-protector \
-Wstrict-overflow=5 \