cxx_stl_setup.mk revision eb3e3fa5dab490428290fd6485e6c51d2df42b5c 
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
17            ifeq ($($(my_prefix)OS),windows)
18                # libc++ is not supported on mingw.
19                my_cxx_stl := libstdc++
20            endif
21        endif
22    else
23        my_cxx_stl := ndk
24    endif
25else
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.
33        #
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): $(LOCAL_MODULE): Must use LOCAL_NDK_STL_VARIANT rather than LOCAL_CXX_STL for NDK binaries)
38    endif
39    ifdef LOCAL_IS_HOST_MODULE
40        ifeq ($($(my_prefix)OS),windows)
41            ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
42                # libc++ is not supported on mingw.
43                my_cxx_stl := libstdc++
44            endif
45        endif
46    endif
47endif
48
49# Yes, this is actually what the clang driver does.
50linux_dynamic_gcclibs := -lgcc_s -lgcc -lc -lgcc_s -lgcc
51linux_static_gcclibs := -Wl,--start-group -lgcc -lgcc_eh -lc -Wl,--end-group
52darwin_dynamic_gcclibs := -lc -lSystem
53darwin_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_DARWIN
54windows_dynamic_gcclibs := \
55    -lmsvcr110 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -ladvapi32 \
56    -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt
57windows_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_WINDOWS
58
59my_link_type := dynamic
60ifdef LOCAL_IS_HOST_MODULE
61    ifneq (,$(BUILD_HOST_static))
62        my_link_type := static
63    endif
64    ifeq (-static,$(filter -static,$(my_ldflags)))
65        my_link_type := static
66    endif
67else
68    ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE))
69        my_link_type := static
70    endif
71endif
72
73ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
74    my_cflags += -D_USING_LIBCXX
75
76    # Note that the structure of this means that LOCAL_CXX_STL := libc++ will
77    # use the static libc++ for static executables.
78    ifeq ($(my_link_type),dynamic)
79        ifeq ($(my_cxx_stl),libc++)
80            my_shared_libraries += libc++
81        else
82            my_static_libraries += libc++_static
83        endif
84    else
85        my_static_libraries += libc++_static
86    endif
87
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)
93    else
94        ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
95            my_static_libraries += libunwind_llvm
96            my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
97        endif
98
99        ifeq ($(my_link_type),static)
100            my_static_libraries += libm libc libdl
101        else
102            my_shared_libraries += libdl
103        endif
104    endif
105else ifeq ($(my_cxx_stl),ndk)
106    # Using an NDK STL. Handled in binary.mk.
107    ifndef LOCAL_IS_HOST_MODULE
108        my_system_shared_libraries += libstdc++
109    endif
110else ifeq ($(my_cxx_stl),libstdc++)
111    # Using bionic's basic libstdc++. Not actually an STL. Only around until the
112    # tree is in good enough shape to not need it.
113    ifndef LOCAL_IS_HOST_MODULE
114        my_c_includes += bionic/libstdc++/include
115        my_system_shared_libraries += libstdc++
116    endif
117    # Host builds will use GNU libstdc++.
118else ifeq ($(my_cxx_stl),none)
119    ifdef LOCAL_IS_HOST_MODULE
120        my_cppflags += -nostdinc++
121        my_ldflags += -nodefaultlibs
122        my_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
123    endif
124else
125    $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)
126endif
127