Igor Melnikov 40e725da03 Makefile: Fix POSIX grep for multiple patterns ...

grep -e "-mstrict-align\|-mno-unaligned-access" makes use of GNU grep's
backslash-escaped alternation operator \| which is available in basic
regular expression syntax (BRE) mode.

However, in POSIX grep's BRE mode | is an ordinary character which, when
backslash-escaped, matches itself. Therefore, the search pattern becomes
a plain string '-mstrict-align|-mno-unaligned-access' which obviously
never matches the expected error and CC_SUPPORT_STRICT_ALIGN is always set
to y.

When cross-compiling with LLVM on amd64-unknown-openbsd7.6 host for
riscv64-unknown-elf target this results in a compilation error:

clang: error: unsupported option '-mno-unaligned-access' for target
'riscv64-unknown-elf'

Using multiple -e options for this case maintains consistent behaviour
across different grep implementations and fixes the issue.

Signed-off-by: Igor Melnikov <imel@purelymail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

2024-12-01 12:32:18 +05:30

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