[glibc] m68k: Use an autoconf template to produce `preconfigure'

[Maciej W. Rozycki <macro@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fe7dd93db3a5ea9246cf32dc713995e78fcaffb9

commit fe7dd93db3a5ea9246cf32dc713995e78fcaffb9
Author: Maciej W. Rozycki <macro@embecosm.com>
Date:   Fri May 13 17:07:23 2022 +0100

    m68k: Use an autoconf template to produce `preconfigure'
    
    Switch to using AC_MSG_ERROR rather than `echo' and `exit' directly for
    error handling.  Owing to the lack of any kind of error annotation it
    makes it difficult to spot the message in the flood in a parallel build
    and neither it is logged in `config.log'.

Diff:
---
 sysdeps/m68k/preconfigure    |  6 ++++--
 sysdeps/m68k/preconfigure.ac | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/sysdeps/m68k/preconfigure b/sysdeps/m68k/preconfigure
index 1028dac080..b1c4d11091 100644
--- a/sysdeps/m68k/preconfigure
+++ b/sysdeps/m68k/preconfigure
@@ -1,3 +1,6 @@
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+# Local preconfigure fragment for sysdeps/m68k
+
 # This fragment canonicalizes the machine names for m68k variants.
 
 case "$machine" in
@@ -10,8 +13,7 @@ m68k)		variant=`(echo "#ifdef __mcoldfire__"
 			 $CC $CFLAGS $CPPFLAGS -E - |
 			 grep '^[a-z]'`
 		if test -z "$variant"; then
-		  echo >&2 "Cannot determine m68k processor variant"
-		  exit 1
+		  as_fn_error 1 "Cannot determine m68k processor variant" "$LINENO" 5
 		fi
 		base_machine=m68k machine=m68k/$variant
 		if test "$variant" = "coldfire"; then
diff --git a/sysdeps/m68k/preconfigure.ac b/sysdeps/m68k/preconfigure.ac
new file mode 100644
index 0000000000..1b0c1370a6
--- /dev/null
+++ b/sysdeps/m68k/preconfigure.ac
@@ -0,0 +1,23 @@
+GLIBC_PROVIDES[]dnl See aclocal.m4 in the top level source directory.
+# Local preconfigure fragment for sysdeps/m68k
+
+# This fragment canonicalizes the machine names for m68k variants.
+
+case "$machine" in
+m680?0)		base_machine=m68k machine=m68k/m680x0/$machine ;;
+m68k)		variant=`(echo "#ifdef __mcoldfire__"
+			  echo "coldfire"
+			  echo "#else"
+			  echo "m680x0/m68020"
+			  echo "#endif") |
+			 $CC $CFLAGS $CPPFLAGS -E - |
+			 grep '^[[a-z]]'`
+		if test -z "$variant"; then
+		  AC_MSG_ERROR([Cannot determine m68k processor variant], [1])
+		fi
+		base_machine=m68k machine=m68k/$variant
+		if test "$variant" = "coldfire"; then
+		  with_fp_cond="defined __mcffpu__"
+		fi
+		;;
+esac