powerpc64le: Require gcc >= 6.2 for powerpc64le

On powerpc64le, support for __float128 will start to be built by default,
which requires gcc versions greater than or equal to 6.2.

Tested for ppc64 (still works with older compilers) and ppc64le.

2017-04-28  Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>
	    Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc64le/configure.ac: New file with test for
	the required minimum gcc version.
	* sysdeps/powerpc/powerpc64le/configure: New, auto-generated file.

2 files changed, 88 insertions, 0 deletions

diff --git a/sysdeps/powerpc/powerpc64le/configure b/sysdeps/powerpc/powerpc64le/configure
new file mode 100644
index 0000000000..f5f10696a7
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64le/configure
@@ -0,0 +1,71 @@
+
+
+# ac_fn_c_try_cpp LINENO
+# ----------------------
+# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_cpp ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } > conftest.i && {
+	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+    ac_retval=1
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_cpp
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/powerpc/powerpc64le.
+
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if $CC is sufficient to build libc for powerpc64le" >&5
+$as_echo_n "checking if $CC is sufficient to build libc for powerpc64le... " >&6; }
+if ${libc_cv_compiler_powerpc64le_compiler_ok+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
+#error insufficient compiler
+#endif
+
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  libc_cv_compiler_powerpc64le_compiler_ok=yes
+else
+  libc_cv_compiler_powerpc64le_compiler_ok=no
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_powerpc64le_compiler_ok" >&5
+$as_echo "$libc_cv_compiler_powerpc64le_compiler_ok" >&6; }
+if test "$libc_cv_compiler_powerpc64le_compiler_ok" != "yes"; then :
+  critic_missing="$critic_missing GCC >= 6.2 is required on powerpc64le."
+fi
+
+test -n "$critic_missing" && as_fn_error $? "*** $critic_missing" "$LINENO" 5
diff --git a/sysdeps/powerpc/powerpc64le/configure.ac b/sysdeps/powerpc/powerpc64le/configure.ac
new file mode 100644
index 0000000000..9d8c54cc34
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64le/configure.ac
@@ -0,0 +1,17 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/powerpc/powerpc64le.
+
+dnl Require __float128 support on powerpc64le (available in GCC 6.2).
+AC_CACHE_CHECK([if $CC is sufficient to build libc for powerpc64le],
+	       libc_cv_compiler_powerpc64le_compiler_ok, [
+AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
+#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
+#error insufficient compiler
+#endif
+]])],
+		  [libc_cv_compiler_powerpc64le_compiler_ok=yes],
+		  [libc_cv_compiler_powerpc64le_compiler_ok=no])])
+AS_IF([test "$libc_cv_compiler_powerpc64le_compiler_ok" != "yes"],
+      [critic_missing="$critic_missing GCC >= 6.2 is required on powerpc64le."])
+
+test -n "$critic_missing" && AC_MSG_ERROR([*** $critic_missing])