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380e3f23bb
Two parse-time probes still invoke $(CC) unconditionally:
- LP64 in tools/scripts/Makefile.arch, probing with
$(CC) -E -x c, pulled in twice by tools/perf/Makefile.perf;
- CC_NO_CLANG in tools/scripts/Makefile.include, probing with
$(CC) -dM -E -x c /dev/null.
In the corner case where gcc is not yet installed, the very setup the
install-build-deps target, added in the next patch of this series, is
meant for, these probes make even targets that never compile parse-time
spew errors like:
/bin/sh: 1: gcc: not found
/bin/sh: 1: gcc: not found
/bin/sh: 1: gcc: not found
Guard both probes with 'command -v' using the first word of CC so a
missing compiler is handled silently with the same result as a failing
probe (CC_NO_CLANG and LP64 unset/0), and with no behavior change when
the compiler is installed.
Only the first word is consulted because CC may carry arguments such as
'ccache gcc', and shell implementations differ in how 'command -v'
handles multiple words (dash only checks the first, bash any of them),
so validating the whole CC value would silently disable both probes on
some make SHELLs.
Assisted-by: opencode:deepseek-v4-flash-free
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
53 lines
1.7 KiB
Makefile
53 lines
1.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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HOSTARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
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-e s/sun4u/sparc/ -e s/sparc64/sparc/ \
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-e /arm64/!s/arm.*/arm/ -e s/sa110/arm/ \
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-e s/s390x/s390/ -e s/parisc64/parisc/ \
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-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
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-e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
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-e s/riscv.*/riscv/ -e s/loongarch.*/loongarch/)
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ifeq ($(strip $(ARCH)),)
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override ARCH := $(HOSTARCH)
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endif
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SRCARCH := $(ARCH)
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# Additional ARCH settings for x86
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ifeq ($(ARCH),i386)
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SRCARCH := x86
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endif
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ifeq ($(ARCH),x86_64)
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SRCARCH := x86
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endif
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# Additional ARCH settings for sparc
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ifeq ($(ARCH),sparc32)
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SRCARCH := sparc
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endif
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ifeq ($(ARCH),sparc64)
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SRCARCH := sparc
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endif
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# Additional ARCH settings for loongarch
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ifeq ($(ARCH),loongarch32)
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SRCARCH := loongarch
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endif
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ifeq ($(ARCH),loongarch64)
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SRCARCH := loongarch
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endif
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# Probe for __LP64__ only when the compiler is installed: this runs at
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# parse time for every target, including ones that never compile, e.g.
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# install-build-deps, and would otherwise spew "gcc: not found" when the
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# compiler is not yet installed. Only the first word of CC is consulted,
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# as CC may carry arguments, e.g. 'ccache gcc'. When the guard fails it
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# prints nothing, leaving LP64 unset, as if the probe had failed.
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LP64 := $(shell if command -v $(firstword ${CC}) >/dev/null 2>&1; then echo __LP64__ | ${CC} ${CFLAGS} -E -x c -; fi | tail -n 1)
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ifeq ($(LP64), 1)
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IS_64_BIT := 1
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else
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IS_64_BIT := 0
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endif
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