[PATCH v2 1/4] aarch64: add configure checks for BTI support

[Andreas Schwab]

On Nov 19 2025, Yury Khrustalev wrote:

> diff --git a/aclocal.m4 b/aclocal.m4
> index cfe9c0b538..31f13a2f46 100644
> --- a/aclocal.m4
> +++ b/aclocal.m4
> @@ -497,3 +497,17 @@ LIBC_CHECK_TEST_CXX(
>      [LIBC_TRY_CXX_OPTION([$2], [$4], [$5])])
>    )
>  ])
> +
> +dnl Check if a CC compiler defines a macro.
> +dnl LIBC_CHECK_CC_MACRO([message], [macro],
> +dnl   [CC-cache-id], [CC-action-if-true], [CC-action-if-false])
> +AC_DEFUN([LIBC_CHECK_CC_MACRO],
> +[
> +AC_CACHE_CHECK([$1], $3, [dnl
> +  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -dM -E - < /dev/null | grep -wF "$2" 1>&AS_MESSAGE_LOG_FD])
> +  then
> +    [$4]
> +  else
> +    [$5]
> +  fi])
> +])

This should use AC_EGREP_CPP, and I don't think we need an extra macro
for that.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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