1#############################################################
2## Set up flags based on LOCAL_CXX_STL.
3## Input variables: LOCAL_CXX_STL
4## Output variables: My_cflags, my_c_includes, my_shared_libraries, etc.
5#############################################################
6
7# Select the appropriate C++ STL
8ifeq ($(strip $(LOCAL_CXX_STL)),default)
9    ifndef LOCAL_SDK_VERSION
10        # Platform code. Select the appropriate STL.
11        ifndef USE_MINGW
12            my_cxx_stl := libc++
13            ifdef LOCAL_IS_HOST_MODULE
14                ifneq (,$(BUILD_HOST_static))
15                    my_cxx_stl := libc++_static
16                endif
17            endif
18        else
19            # libc++ is not supported on mingw.
20            my_cxx_stl := libstdc++
21        endif
22    else
23        my_cxx_stl := ndk
24    endif
25else
26    my_cxx_stl := $(strip $(LOCAL_CXX_STL))
27endif
28
29# Yes, this is actually what the clang driver does.
30HOST_linux_dynamic_gcclibs := -lgcc_s -lgcc -lc -lgcc_s -lgcc
31HOST_linux_static_gcclibs := -Wl,--start-group -lgcc -lgcc_eh -lc -Wl,--end-group
32HOST_darwin_dynamic_gcclibs := -lc -lSystem
33HOST_darwin_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_DARWIN
34
35my_link_type := dynamic
36ifdef LOCAL_IS_HOST_MODULE
37    ifneq (,$(BUILD_HOST_static))
38        my_link_type := static
39    endif
40    ifeq (-static,$(filter -static,$(my_ldflags)))
41        my_link_type := static
42    endif
43else
44    ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE))
45        my_link_type := static
46    endif
47endif
48
49ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
50    my_cflags += -D_USING_LIBCXX
51    my_c_includes += external/libcxx/include
52    ifeq ($(my_cxx_stl),libc++)
53        my_shared_libraries += libc++
54    else
55        my_static_libraries += libc++_static
56        ifndef LOCAL_IS_HOST_MODULE
57            ifeq ($(LOCAL_FORCE_STATIC_EXECUTABLE),true)
58                my_static_libraries += libm libc libdl
59            endif
60        endif
61    endif
62
63    ifdef LOCAL_IS_HOST_MODULE
64        my_cppflags += -nostdinc++
65        my_ldflags += -nodefaultlibs
66        my_ldlibs += -lpthread -lm
67        my_ldlibs += $($(my_prefix)$(HOST_OS)_$(my_link_type)_gcclibs)
68    else
69        ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
70            my_static_libraries += libunwind_llvm
71            my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
72        endif
73
74        ifeq ($(my_link_type),static)
75            my_static_libraries += libdl
76        else
77            my_shared_libraries += libdl
78        endif
79    endif
80else ifeq ($(my_cxx_stl),ndk)
81    # Using an NDK STL. Handled in binary.mk.
82    ifndef LOCAL_IS_HOST_MODULE
83        my_system_shared_libraries += libstdc++
84    endif
85else ifeq ($(my_cxx_stl),libstdc++)
86    # Using bionic's basic libstdc++. Not actually an STL. Only around until the
87    # tree is in good enough shape to not need it.
88    ifndef LOCAL_IS_HOST_MODULE
89        my_c_includes += bionic/libstdc++/include
90        my_system_shared_libraries += libstdc++
91    endif
92    # Host builds will use GNU libstdc++.
93else ifeq ($(my_cxx_stl),none)
94    ifdef LOCAL_IS_HOST_MODULE
95        my_cppflags += -nostdinc++
96        my_ldflags += -nodefaultlibs
97        my_ldlibs += $($(my_prefix)$(HOST_OS)_$(my_link_type)_gcclibs)
98    endif
99else
100    $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)
101endif
102