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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,$(LOCAL_FORCE_STATIC_EXECUTABLE))
69        my_link_type := static
70    endif
71endif
72
73my_cxx_ldlibs :=
74ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
75    my_cflags += -D_USING_LIBCXX
76
77    # Note that the structure of this means that LOCAL_CXX_STL := libc++ will
78    # use the static libc++ for static executables.
79    ifeq ($(my_link_type),dynamic)
80        ifeq ($(my_cxx_stl),libc++)
81            my_shared_libraries += libc++
82        else
83            my_static_libraries += libc++_static
84        endif
85    else
86        my_static_libraries += libc++_static
87    endif
88
89    ifdef LOCAL_IS_HOST_MODULE
90        my_cppflags += -nostdinc++
91        my_ldflags += -nodefaultlibs
92        my_ldlibs += -lpthread -lm
93        my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
94    else
95        ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
96            my_static_libraries += libunwind_llvm
97            my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
98        endif
99
100        ifeq ($(my_link_type),static)
101            my_static_libraries += libm libc libdl
102        else
103            my_shared_libraries += libdl
104        endif
105    endif
106else ifeq ($(my_cxx_stl),ndk)
107    # Using an NDK STL. Handled in binary.mk.
108else ifeq ($(my_cxx_stl),libstdc++)
109    ifndef LOCAL_IS_HOST_MODULE
110        $(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported for device modules)
111    else ifneq ($($(my_prefix)OS),windows)
112        $(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported on $($(my_prefix)OS))
113    endif
114else ifeq ($(my_cxx_stl),none)
115    ifdef LOCAL_IS_HOST_MODULE
116        my_cppflags += -nostdinc++
117        my_ldflags += -nodefaultlibs
118        my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
119    endif
120else
121    $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)
122endif
123