#############################################################
## Set up flags based on LOCAL_CXX_STL.
## Input variables: LOCAL_CXX_STL, my_prefix
## Output variables: My_cflags, my_c_includes, my_shared_libraries, etc.
#############################################################
# Select the appropriate C++ STL
ifeq ($(strip $(LOCAL_CXX_STL)),default)
ifndef LOCAL_SDK_VERSION
# Platform code. Select the appropriate STL.
my_cxx_stl := libc++
ifdef LOCAL_IS_HOST_MODULE
ifneq (,$(BUILD_HOST_static))
my_cxx_stl := libc++_static
endif
ifeq ($($(my_prefix)OS),windows)
my_cxx_stl := libc++_static
endif
endif
else
my_cxx_stl := ndk
endif
else
my_cxx_stl := $(strip $(LOCAL_CXX_STL))
ifdef LOCAL_SDK_VERSION
# The NDK has historically used LOCAL_NDK_STL_VARIANT to specify the
# STL. An Android.mk that specifies both LOCAL_CXX_STL and
# LOCAL_SDK_VERSION will incorrectly try (and most likely fail) to use
# the platform STL in an NDK binary. Emit an error to direct the user
# toward the correct option.
#
# Note that we could also accept LOCAL_CXX_STL as an alias for
# LOCAL_NDK_STL_VARIANT (and in fact soong does use the same name), but
# the two options use different names for the STLs.
$(error $(LOCAL_PATH): $(LOCAL_MODULE): Must use LOCAL_NDK_STL_VARIANT rather than LOCAL_CXX_STL for NDK binaries)
endif
ifdef LOCAL_IS_HOST_MODULE
ifeq ($($(my_prefix)OS),windows)
ifneq ($(filter $(my_cxx_stl),libc++),)
# only libc++_static is supported on mingw.
my_cxx_stl := libc++_static
endif
endif
endif
endif
# Yes, this is actually what the clang driver does.
linux_dynamic_gcclibs := -lgcc_s -lgcc -lc -lgcc_s -lgcc
linux_static_gcclibs := -Wl,--start-group -lgcc -lgcc_eh -lc -Wl,--end-group
darwin_dynamic_gcclibs := -lc -lSystem
darwin_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_DARWIN
windows_dynamic_gcclibs := \
-Wl,--start-group -lmingw32 -lgcc -lgcc_eh -lmoldname -lmingwex \
-lmsvcrt -lucrt -lpthread -ladvapi32 -lshell32 -luser32 -lkernel32 -lpsapi \
-Wl,--end-group
windows_static_gcclibs := NO_STATIC_HOST_BINARIES_ON_WINDOWS
my_link_type := dynamic
ifdef LOCAL_IS_HOST_MODULE
ifneq (,$(BUILD_HOST_static))
my_link_type := static
endif
ifeq (-static,$(filter -static,$(my_ldflags)))
my_link_type := static
endif
else
ifeq (true,$(LOCAL_FORCE_STATIC_EXECUTABLE))
my_link_type := static
endif
endif
my_cxx_ldlibs :=
ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
my_cflags += -D_USING_LIBCXX
ifeq ($($(my_prefix)OS),darwin)
# libc++'s headers are annotated with availability macros that indicate
# which version of Mac OS was the first to ship with a libc++ feature
# available in its *system's* libc++.dylib. We do not use the system's
# library, but rather ship our own. As such, these availability
# attributes are meaningless for us but cause build breaks when we try
# to use code that would not be available in the system's dylib.
my_cppflags += -D_LIBCPP_DISABLE_AVAILABILITY
endif
# Note that the structure of this means that LOCAL_CXX_STL := libc++ will
# use the static libc++ for static executables.
ifeq ($(my_link_type),dynamic)
ifeq ($(my_cxx_stl),libc++)
my_shared_libraries += libc++
else
my_static_libraries += libc++_static
endif
else
my_static_libraries += libc++_static
endif
ifdef LOCAL_IS_HOST_MODULE
my_cppflags += -nostdinc++
my_ldflags += -nodefaultlibs
my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
ifeq ($($(my_prefix)OS),windows)
# Use SjLj exceptions for 32-bit. libgcc_eh implements SjLj
# exception model for 32-bit.
ifeq (x86,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
my_cppflags += -fsjlj-exceptions
endif
# Disable visibility annotations since we're using libc++ static
# library.
my_cppflags += -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
my_cppflags += -D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS
# Use Win32 threads in libc++.
my_cppflags += -D_LIBCPP_HAS_THREAD_API_WIN32
endif
else
ifeq (arm,$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH))
my_static_libraries += libunwind_llvm
my_ldflags += -Wl,--exclude-libs,libunwind_llvm.a
endif
ifeq ($(my_link_type),static)
my_static_libraries += libm libc libdl
endif
endif
else ifeq ($(my_cxx_stl),ndk)
# Using an NDK STL. Handled in binary.mk.
else ifeq ($(my_cxx_stl),libstdc++)
$(error $(LOCAL_PATH): $(LOCAL_MODULE): libstdc++ is not supported)
else ifeq ($(my_cxx_stl),none)
ifdef LOCAL_IS_HOST_MODULE
my_cppflags += -nostdinc++
my_ldflags += -nodefaultlibs
my_cxx_ldlibs += $($($(my_prefix)OS)_$(my_link_type)_gcclibs)
endif
else
$(error $(LOCAL_PATH): $(LOCAL_MODULE): $(my_cxx_stl) is not a supported STL.)
endif
