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X86_64: Add libcxx availability macros.

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Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>
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cuiziwei 2024-04-01 14:09:54 +08:00 • committed by Xiang Xiao
parent 1373957ea0
commit 5e96e72cb6
1 changed files with 36 additions and 0 deletions
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36
arch/x86_64/src/common/Toolchain.defs
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@ -18,6 +18,25 @@
#
############################################################################
# NuttX is sometimes built as a native target.
# In that case, the __NuttX__ macro is predefined by the compiler.
# https://github.com/NuttX/buildroot
#
# In other cases, __NuttX__ is an ordinary user-definded macro.
# It's especially the case for NuttX sim, which is a target to run
# the entire NuttX as a program on the host OS, which can be Linux,
# macOS, Windows, etc.
# https://cwiki.apache.org/confluence/display/NUTTX/NuttX+Simulation
# In that case, the host OS compiler is used to build NuttX.
# Thus, eg. NuttX sim on macOS is built with __APPLE__.
# We #undef predefined macros for those possible host OSes here
# because the OS APIs this library should use are of NuttX,
# not the host OS.
ARCHDEFINES += -U_AIX -U_WIN32 -U__APPLE__ -U__FreeBSD__
ARCHDEFINES += -U__NetBSD__ -U__linux__ -U__sun__ -U__unix__
ARCHDEFINES += -U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
ARCHOPTIMIZATION = $(CONFIG_DEBUG_SYMBOLS_LEVEL)
endif
@ -58,6 +77,23 @@ ifeq ($(CONFIG_DEBUG_LINK_WHOLE_ARCHIVE),y)
LDFLAGS += --whole-archive
endif
ifeq ($(CONFIG_LIBCXX),y)
# Linux C++ ABI seems vary.
# Probably __GLIBCXX__ is the best bet.
# XXX what to do for windows?
CXXFLAGS += -D__GLIBCXX__
# Disable availability macros.
# The availability on Host OS is not likely appropriate for NuttX.
#
# Note: When compiling NuttX apps, we undefine __APPLE__.
# It makes libcxx __availability header unhappy.
# https://github.com/llvm/llvm-project/blob/2e2999cd44f6ec9a5e396fa0113497ea82582f69/libcxx/include/__availability#L258
CXXFLAGS += -D_LIBCPP_DISABLE_AVAILABILITY
endif
CC = $(CROSSDEV)gcc
CPP = $(CROSSDEV)gcc -E -x c
LD = $(CROSSDEV)ld