1# CROSS_COMPILE_$(sm) is derived from CROSS_COMPILE/CROSS_COMPILE32/ 2# CROSS_COMPILE64 and indicates the target that should be passed to clang. Path 3# components are ignored, as well as any command before the compiler name (for 4# instance "/some/path/ccache /other/path/arm-linux-gnueabihf-"). 5# We try to extract any ccache command if present. 6clang-target := $(patsubst %-,%,$(notdir $(lastword $(CROSS_COMPILE_$(sm))))) 7ccache-cmd := $(if $(findstring ccache,$(CROSS_COMPILE_$(sm))),$(firstword $(CROSS_COMPILE_$(sm))) ,) 8 9CC$(sm) := $(ccache-cmd)clang --target=$(clang-target) 10# Due to the absence of clang-cpp in AOSP's prebuilt version of clang, 11# use the equivalent command of 'clang -E' 12CPP$(sm) := $(ccache-cmd)clang --target=$(clang-target) -E 13LD$(sm) := $(ccache-cmd)ld.lld 14 15AR$(sm) := $(ccache-cmd)llvm-ar 16NM$(sm) := llvm-nm 17OBJCOPY$(sm) := llvm-objcopy 18OBJDUMP$(sm) := llvm-objdump 19READELF$(sm) := llvm-readelf 20 21nostdinc$(sm) := -nostdinc -isystem $(shell $(CC$(sm)) \ 22 -print-file-name=include 2> /dev/null) 23 24comp-cflags-warns-clang := -Wno-language-extension-token \ 25 -Wno-gnu-zero-variadic-macro-arguments 26 27# Note, the currently used compiler runtime library may be libgcc.a or 28# libclang_rt.builtins.*.a depending on the compiler build-time configuration. 29libgcc$(sm) := $(shell $(CC$(sm)) $(CFLAGS$(arch-bits-$(sm))) $(comp-cflags$(sm)) \ 30 -print-libgcc-file-name 2> /dev/null) 31 32# Core ASLR relies on the executable being ready to run from its preferred load 33# address, because some symbols are used before the MMU is enabled and the 34# relocations are applied. 35ldflag-apply-dynamic-relocs := --apply-dynamic-relocs 36 37# Define these to something to discover accidental use 38CC := false 39CPP := false 40LD := false 41AR := false 42NM := false 43OBJCOPY := false 44OBJDUMP := false 45READELF := false 46nostdinc := --bad-nostdinc-variable 47libgcc := --bad-libgcc-variable 48 49