[PATCH v3 1/3] Disable SFrame support by default

[Claudiu Zissulescu-Ianculescu]

> -# Glibc stacktracer supports SFrame v2 or newer
> -libc_cv_readelf_version_ok=yes
> -# SFrame is supported from 2.41 or higher
> -AC_CHECK_PROG_VER(READELF_SFRAME, $READELF, --version,
> -  [GNU readelf.* \([0-9][0-9]*\.[0-9.]*\)],
> -  [2.4[1-9]*|2.[5-9][0-9]*|[3-9].*|[1-9][0-9][0-9]*],
> -  libc_cv_readelf_version_ok=no)
> +enable_gsframe=no
> +if test $use_sframe = yes; then
> +  # SFrame requires to be explicit enabled by the architecture
> +  if test -z $libc_cv_support_sframe; then
> +    AC_MSG_FAILURE([the architecture doesn't support SFrame])
> +  fi

A small observation, the sframe will be enable also when
$libc_cv_support_sframe=no.

LGTM, and thank you,
Claudiu