1############################################################# 2## Set up flags based on LOCAL_CXX_STL. 3## Input variables: LOCAL_CXX_STL, my_prefix 4## Output variables: My_cflags, my_c_includes, my_shared_libraries, etc. 5############################################################# 6 7# Select the appropriate C++ STL 8ifeq ($(strip $(LOCAL_CXX_STL)),default) 9 ifndef LOCAL_SDK_VERSION 10 # Platform code. Select the appropriate STL. 11 my_cxx_stl := libc++ 12 ifdef LOCAL_IS_HOST_MODULE 13 ifneq (,$(BUILD_HOST_static)) 14 my_cxx_stl := libc++_static 15 endif 16 endif 17 else 18 my_cxx_stl := ndk 19 endif 20else 21 my_cxx_stl := $(strip $(LOCAL_CXX_STL)) 22 ifdef LOCAL_SDK_VERSION 23 # The NDK has historically used LOCAL_NDK_STL_VARIANT to specify the 24 # STL. An Android.mk that specifies both LOCAL_CXX_STL and 25 # LOCAL_SDK_VERSION will incorrectly try (and most likely fail) to use 26 # the platform STL in an NDK binary. Emit an error to direct the user 27 # toward the correct option. 28 # 29 # Note that we could also accept LOCAL_CXX_STL as an alias for 30 # LOCAL_NDK_STL_VARIANT (and in fact soong does use the same name), but 31 # the two options use different names for the STLs. 32 $(error $(LOCAL_PATH): $(LOCAL_MODULE): Must use LOCAL_NDK_STL_VARIANT rather than LOCAL_CXX_STL for NDK binaries) 33 endif 34endif 35 36my_link_type := dynamic 37ifdef LOCAL_IS_HOST_MODULE 38 ifneq (,$(BUILD_HOST_static)) 39 my_link_type := static 40 endif 41 ifeq (-static,$(filter -static,$(my_ldflags))) 42 my_link_type := static 43 endif 44else 45 ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE)) 46 my_link_type := static 47 endif 48endif 49 50my_cxx_ldlibs := 51ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),) 52 ifeq ($($(my_prefix)OS),darwin) 53 # libc++'s headers are annotated with availability macros that indicate 54 # which version of Mac OS was the first to ship with a libc++ feature 55 # available in its *system's* libc++.dylib. We do not use the system's 56 # library, but rather ship our own. As such, these availability 57 # attributes are meaningless for us but cause build breaks when we try 58 # to use code that would not be available in the system's dylib. 59 my_cppflags += -D_LIBCPP_DISABLE_AVAILABILITY 60 endif 61 62 # Note that the structure of this means that LOCAL_CXX_STL := libc++ will 63 # use the static libc++ for static executables. 64 ifeq ($(my_link_type),dynamic) 65 ifeq ($(my_cxx_stl),libc++) 66 my_shared_libraries += libc++ 67 else 68 my_static_libraries += libc++_static 69 endif 70 else 71 my_static_libraries += libc++_static 72 endif 73 74 ifdef LOCAL_IS_HOST_MODULE 75 my_cppflags += -nostdinc++ 76 my_ldflags += -nostdlib++ 77 else 78 my_static_libraries += libc++demangle 79 80 ifeq ($(my_link_type),static) 81 my_static_libraries += libm libc 82 ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) 83 my_static_libraries += libunwind_llvm 84 my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a 85 else 86 my_static_libraries += libgcc_stripped 87 my_ldflags += -Wl,--exclude-libs,libgcc_stripped.a 88 endif 89 endif 90 endif 91else ifeq ($(my_cxx_stl),ndk) 92 # Using an NDK STL. Handled in binary.mk, except for the unwinder. 93 ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) 94 my_static_libraries += libunwind_llvm 95 my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a 96 else 97 my_static_libraries += libgcc_stripped 98 my_ldflags += -Wl,--exclude-libs,libgcc_stripped.a 99 endif 100else ifeq ($(my_cxx_stl),libstdc++) 101 $(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported) 102else ifeq ($(my_cxx_stl),none) 103 ifdef LOCAL_IS_HOST_MODULE 104 my_cppflags += -nostdinc++ 105 my_ldflags += -nostdlib++ 106 endif 107else 108 $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.) 109endif 110