77342a02ff
Nobody was opposed to raising minimum GCC version to 4.8 [1] So, we will drop GCC <= 4.7 support sooner or later. We always use C++ compiler for building plugins for GCC >= 4.8. This commit drops the plugin support for GCC <= 4.7 a bit earlier, which allows us to dump lots of code. [1] https://lkml.org/lkml/2020/1/23/545 Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Kees Cook <keescook@chromium.org>
57 lines
2 KiB
Plaintext
57 lines
2 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
# Kconfig helper macros
|
|
|
|
# Convenient variables
|
|
comma := ,
|
|
quote := "
|
|
squote := '
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
dollar := $
|
|
right_paren := )
|
|
left_paren := (
|
|
|
|
# $(if-success,<command>,<then>,<else>)
|
|
# Return <then> if <command> exits with 0, <else> otherwise.
|
|
if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
|
|
|
|
# $(success,<command>)
|
|
# Return y if <command> exits with 0, n otherwise
|
|
success = $(if-success,$(1),y,n)
|
|
|
|
# $(failure,<command>)
|
|
# Return n if <command> exits with 0, y otherwise
|
|
failure = $(if-success,$(1),n,y)
|
|
|
|
# $(cc-option,<flag>)
|
|
# Return y if the compiler supports <flag>, n otherwise
|
|
cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /dev/null)
|
|
|
|
# $(ld-option,<flag>)
|
|
# Return y if the linker supports <flag>, n otherwise
|
|
ld-option = $(success,$(LD) -v $(1))
|
|
|
|
# $(as-option,<flag>)
|
|
# /dev/zero is used as output instead of /dev/null as some assembler cribs when
|
|
# both input and output are same. Also both of them have same write behaviour so
|
|
# can be easily substituted.
|
|
as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero)
|
|
|
|
# $(as-instr,<instr>)
|
|
# Return y if the assembler supports <instr>, n otherwise
|
|
as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
|
|
|
|
# check if $(CC) and $(LD) exist
|
|
$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
|
|
$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
|
|
|
|
# Fail if the linker is gold as it's not capable of linking the kernel proper
|
|
$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
|
|
|
|
# machine bit flags
|
|
# $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
|
|
# $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
|
|
cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
|
|
m32-flag := $(cc-option-bit,-m32)
|
|
m64-flag := $(cc-option-bit,-m64)
|