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Disable availability macros in libc++ on 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.

Test: removed the darwin check and checked showcommands on linux
Bug: None
Change-Id: I5f69f337baa29fcdf84b5e2fe46bf4f85904d1cd
This commit is contained in:
Dan Albert 2018-01-11 13:24:32 -08:00
parent 08e7159672
commit 9262b6fead
1 changed files with 10 additions and 0 deletions
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10
core/cxx_stl_setup.mk
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@ -74,6 +74,16 @@ 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)