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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
      8 ifeq ($(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
     25 else
     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 $(my_cxx_stl),libc++ libc++_static),)
     42                 # libc++ is not supported on mingw.
     43                 my_cxx_stl := libstdc++
     44             endif
     45         endif
     46     endif
     47 endif
     48 
     49 # Yes, this is actually what the clang driver does.
     50 linux_dynamic_gcclibs := -lgcc_s -lgcc -lc -lgcc_s -lgcc
     51 linux_static_gcclibs := -Wl,--start-group -lgcc -lgcc_eh -lc -Wl,--end-group
     52 darwin_dynamic_gcclibs := -lc -lSystem
     53 darwin_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_DARWIN
     54 windows_dynamic_gcclibs := \
     55     -lmsvcr110 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -ladvapi32 \
     56     -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt
     57 windows_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_WINDOWS
     58 
     59 my_link_type := dynamic
     60 ifdef LOCAL_IS_HOST_MODULE
     61     ifneq (,$(BUILD_HOST_static))
     62         my_link_type := static
     63     endif
     64     ifeq (-static,$(filter -static,$(my_ldflags)))
     65         my_link_type := static
     66     endif
     67 else
     68     ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE))
     69         my_link_type := static
     70     endif
     71 endif
     72 
     73 my_cxx_ldlibs :=
     74 ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
     75     my_cflags += -D_USING_LIBCXX
     76 
     77     ifeq ($($(my_prefix)OS),darwin)
     78         # libc++'s headers are annotated with availability macros that indicate
     79         # which version of Mac OS was the first to ship with a libc++ feature
     80         # available in its *system's* libc++.dylib. We do not use the system's
     81         # library, but rather ship our own. As such, these availability
     82         # attributes are meaningless for us but cause build breaks when we try
     83         # to use code that would not be available in the system's dylib.
     84         my_cppflags += -D_LIBCPP_DISABLE_AVAILABILITY
     85     endif
     86 
     87     # Note that the structure of this means that LOCAL_CXX_STL := libc++ will
     88     # use the static libc++ for static executables.
     89     ifeq ($(my_link_type),dynamic)
     90         ifeq ($(my_cxx_stl),libc++)
     91             my_shared_libraries += libc++
     92         else
     93             my_static_libraries += libc++_static
     94         endif
     95     else
     96         my_static_libraries += libc++_static
     97     endif
     98 
     99     ifdef LOCAL_IS_HOST_MODULE
    100         my_cppflags += -nostdinc++
    101         my_ldflags += -nodefaultlibs
    102         my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
    103     else
    104         ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
    105             my_static_libraries += libunwind_llvm
    106             my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
    107         endif
    108 
    109         ifeq ($(my_link_type),static)
    110             my_static_libraries += libm libc libdl
    111         endif
    112     endif
    113 else ifeq ($(my_cxx_stl),ndk)
    114     # Using an NDK STL. Handled in binary.mk.
    115 else ifeq ($(my_cxx_stl),libstdc++)
    116     ifndef LOCAL_IS_HOST_MODULE
    117         $(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported for device modules)
    118     else ifneq ($($(my_prefix)OS),windows)
    119         $(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported on $($(my_prefix)OS))
    120     endif
    121 else ifeq ($(my_cxx_stl),none)
    122     ifdef LOCAL_IS_HOST_MODULE
    123         my_cppflags += -nostdinc++
    124         my_ldflags += -nodefaultlibs
    125         my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
    126     endif
    127 else
    128     $(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)
    129 endif
    130