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 #############################################################
7 # Select the appropriate C++ STL
8 ifeq ($(strip $(LOCAL_CXX_STL)),default)
9 ifndef LOCAL_SDK_VERSION
10 # Platform code. Select the appropriate STL.
12 ifdef LOCAL_IS_HOST_MODULE
13 ifneq (,$(BUILD_HOST_static))
14 my_cxx_stl := libc++_static
17 ifeq ($($(my_prefix)OS),windows)
18 # libc++ is not supported on mingw.
19 my_cxx_stl := libstdc++
26 my_cxx_stl := $(strip $(LOCAL_CXX_STL))
27 ifdef LOCAL_SDK_VERSION
28 # The NDK has historically used LOCAL_NDK_STL_VARIANT to specify the
29 # STL. An Android.mk that specifies both LOCAL_CXX_STL and
30 # LOCAL_SDK_VERSION will incorrectly try (and most likely fail) to use
31 # the platform STL in an NDK binary. Emit an error to direct the user
32 # toward the correct option.
34 # Note that we could also accept LOCAL_CXX_STL as an alias for
35 # LOCAL_NDK_STL_VARIANT (and in fact soong does use the same name), but
36 # the two options use different names for the STLs.
37 $(error $(LOCAL_PATH): $(LOCAL_MODULE): Must use LOCAL_NDK_STL_VARIANT rather than LOCAL_CXX_STL for NDK binaries)
39 ifdef LOCAL_IS_HOST_MODULE
40 ifeq ($($(my_prefix)OS),windows)
41 ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
42 # libc++ is not supported on mingw.
43 my_cxx_stl := libstdc++
49 # Yes, this is actually what the clang driver does.
50 linux_dynamic_gcclibs := -lgcc_s -lgcc -lc -lgcc_s -lgcc
51 linux_static_gcclibs := -Wl,--start-group -lgcc -lgcc_eh -lc -Wl,--end-group
52 darwin_dynamic_gcclibs := -lc -lSystem
53 darwin_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_DARWIN
54 windows_dynamic_gcclibs := \
55 -lmsvcr110 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -ladvapi32 \
56 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt
57 windows_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_WINDOWS
59 my_link_type := dynamic
60 ifdef LOCAL_IS_HOST_MODULE
61 ifneq (,$(BUILD_HOST_static))
62 my_link_type := static
64 ifeq (-static,$(filter -static,$(my_ldflags)))
65 my_link_type := static
68 ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE))
69 my_link_type := static
73 ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
74 my_cflags += -D_USING_LIBCXX
76 # Note that the structure of this means that LOCAL_CXX_STL := libc++ will
77 # use the static libc++ for static executables.
78 ifeq ($(my_link_type),dynamic)
79 ifeq ($(my_cxx_stl),libc++)
80 my_shared_libraries += libc++
82 my_static_libraries += libc++_static
85 my_static_libraries += libc++_static
88 ifdef LOCAL_IS_HOST_MODULE
89 my_cppflags += -nostdinc++
90 my_ldflags += -nodefaultlibs
91 my_ldlibs += -lpthread -lm
92 my_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
94 ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
95 my_static_libraries += libunwind_llvm
96 my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
99 ifeq ($(my_link_type),static)
100 my_static_libraries += libm libc libdl
102 my_shared_libraries += libdl
105 else ifeq ($(my_cxx_stl),ndk)
106 # Using an NDK STL. Handled in binary.mk.
107 else ifeq ($(my_cxx_stl),libstdc++)
108 # Using bionic's basic libstdc++. Not actually an STL. Only around until the
109 # tree is in good enough shape to not need it.
110 ifndef LOCAL_IS_HOST_MODULE
111 my_c_includes += bionic/libstdc++/include
112 my_system_shared_libraries += libstdc++
114 # Host builds will use GNU libstdc++.
115 else ifeq ($(my_cxx_stl),none)
116 ifdef LOCAL_IS_HOST_MODULE
117 my_cppflags += -nostdinc++
118 my_ldflags += -nodefaultlibs
119 my_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
122 $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)