configure: Add --enable-sframe option

Enable SFrame stack track information. The --enable-sframe option
allows the glibc build to compile with SFrame stack track
information. Thus, enabling glibc's backtrace to work within glibc.

Signed-off-by: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com>
Reviewed-by: DJ Delorie <dj@redhat.com>
Reviewed-by: Sam James <sam@gentoo.org>

configure

@@ -620,6 +620,8 @@ DEFINES
 static_nss
 profile
 libc_cv_multidir
+enable_gsframe
+READELF_SFRAME
 libc_cv_test_x86_have_amx_tile
 test_enable_cet
 libc_cv_test_cc_mprefer_vector_width
@@ -822,6 +824,7 @@ enable_mathvec
 enable_cet
 enable_scv
 enable_fortify_source
+enable_sframe
 with_cpu
 '
       ac_precious_vars='build_alias
@@ -1507,6 +1510,8 @@ Optional Features:
                           Use -D_FORTIFY_SOURCE=[1|2|3] to control code
                           hardening, defaults to highest possible value
                           supported by the build compiler.
+  --disable-sframe        Disable building with SFrame stack trace information
+                          [default=yes if GNU as is 2.41 or older]
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -4885,6 +4890,16 @@ case "$enable_fortify_source" in
 *) as_fn_error $? "Not a valid argument for --enable-fortify-source: \"$enable_fortify_source\"" "$LINENO" 5;;
 esac
 
+# Check whether --enable-sframe was given.
+if test ${enable_sframe+y}
+then :
+  enableval=$enable_sframe; use_sframe=$enableval
+else case e in #(
+  e) use_sframe=notset ;;
+esac
+fi
+
+
 # We keep the original values in `$config_*' and never modify them, so we
 # can write them unchanged into config.make.  Everything else uses
 # $machine, $vendor, and $os, and changes them whenever convenient.
@@ -9341,6 +9356,120 @@ have-libgcc_s = $libc_cv_have_libgcc_s"
 
 
 
+# Glibc stacktracer supports SFrame v2 or newer
+libc_cv_readelf_version_ok=yes
+# SFrame is supported from 2.41 or higher
+for ac_prog in $READELF
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_READELF_SFRAME+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$READELF_SFRAME"; then
+  ac_cv_prog_READELF_SFRAME="$READELF_SFRAME" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_READELF_SFRAME="$ac_prog"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+READELF_SFRAME=$ac_cv_prog_READELF_SFRAME
+if test -n "$READELF_SFRAME"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $READELF_SFRAME" >&5
+printf "%s\n" "$READELF_SFRAME" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+  test -n "$READELF_SFRAME" && break
+done
+
+if test -z "$READELF_SFRAME"; then
+  ac_verc_fail=yes
+else
+  # Found it, now check the version.
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking version of $READELF_SFRAME" >&5
+printf %s "checking version of $READELF_SFRAME... " >&6; }
+  ac_prog_version=`$READELF_SFRAME --version 2>&1 | sed -n 's/^.*GNU readelf.* \([0-9][0-9]*\.[0-9.]*\).*$/\1/p'`
+  case $ac_prog_version in
+    '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
+    2.4[1-9]*|2.[5-9][0-9]*|[3-9].*|[1-9][0-9][0-9]*)
+       ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
+    *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
+
+  esac
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_prog_version" >&5
+printf "%s\n" "$ac_prog_version" >&6; }
+fi
+if test $ac_verc_fail = yes; then
+  libc_cv_readelf_version_ok=no
+fi
+
+
+# Check the current toolchain for SFrame support
+if test $libc_cv_readelf_version_ok = yes; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for SFrame support" >&5
+printf %s "checking for SFrame support... " >&6; }
+if test ${libc_cv_default_sframe+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat > conftest.c <<EOF
+int test_function(void)
+{
+  return 42;
+}
+EOF
+  libc_cv_default_sframe=no
+  if ${CC} -c conftest.c -o conftest.o -Wa,--gsframe >/dev/null 2>&1 && \
+     # Check if .sframe section is present and if version > 1
+     $READELF --sframe conftest.o | grep "SFRAME_VER" | grep -qv "VERSION_1"; then
+          libc_cv_default_sframe=yes
+  fi
+  rm -f conftest.c conftest.o
+   ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_default_sframe" >&5
+printf "%s\n" "$libc_cv_default_sframe" >&6; }
+fi
+
+# Prevent enabling sframe on non-supporting toolchains
+enable_gsframe=no
+if test $use_sframe$libc_cv_default_sframe = yesyes || \
+   test $use_sframe$libc_cv_default_sframe = notsetyes; then
+  enable_gsframe=yes
+elif test $use_sframe = yes; then
+   { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "toolchain doesn't support SFrame v2 or higher
+See 'config.log' for more details" "$LINENO" 5; }
+fi
+
+
 # Set the `multidir' variable by grabbing the variable from the compiler.
 # We do it once and save the result in a generated makefile.
 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`