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

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

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=353a1220e3a4ece67216c07796cb0fd2b3d2e309

commit 353a1220e3a4ece67216c07796cb0fd2b3d2e309
Author: Maciej W. Rozycki <macro@embecosm.com>
Date:   Fri May 13 17:07:23 2022 +0100

    MIPS: Use an autoconf template to produce `preconfigure'
    
    Avoid fiddling with autoconf internals and use AC_DEFINE_UNQUOTED to
    define macros in the configuration headers rather than handcoding an
    equivalent shell sequence with the use of the `as_echo' undocumented
    variable.
    
    Similarly use AC_MSG_ERROR for error handling rather than the internal
    undocumented `as_fn_error' variable.  Switch to using 1 as the exit code
    as it makes no sense to refer $? in the contexts involved, it's not a
    command failure handled there.

Diff:
---
 sysdeps/mips/preconfigure    |  7 +++++--
 sysdeps/mips/preconfigure.ac | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/sysdeps/mips/preconfigure b/sysdeps/mips/preconfigure
index 48fc32ed5b..a5c6840ed2 100644
--- a/sysdeps/mips/preconfigure
+++ b/sysdeps/mips/preconfigure
@@ -1,3 +1,6 @@
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+# Local preconfigure fragment for sysdeps/mips
+
 case "$machine" in
 mips*)
 	abiflag=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define _MIPS_SIM \(.*\)/\1/p'`
@@ -15,7 +18,7 @@ mips*)
 	elif test "$abiflag" = "_ABI64" ; then
 		machine=mips/mips64/n64
 	else
-		as_fn_error $? "Unable to determine ABI." "$LINENO" 5
+		as_fn_error 1 "Unable to determine ABI." "$LINENO" 5
 	fi
 	# $config_machine is not really needed here but the slash after
 	# $machine is needed by the case statement in
@@ -23,7 +26,7 @@ mips*)
 	machine=$machine/$config_machine
 
 	if test "$abiflag" != "_ABIO32" -a "$mips16flag" = "1"; then
-		as_fn_error $? "MIPS16 is only supported with the o32 ABI." "$LINENO" 5
+		as_fn_error 1 "MIPS16 is only supported with the o32 ABI." "$LINENO" 5
 	fi
 
 	with_fp_cond="defined __mips_hard_float"
diff --git a/sysdeps/mips/preconfigure.ac b/sysdeps/mips/preconfigure.ac
new file mode 100644
index 0000000000..038920265b
--- /dev/null
+++ b/sysdeps/mips/preconfigure.ac
@@ -0,0 +1,34 @@
+GLIBC_PROVIDES[]dnl See aclocal.m4 in the top level source directory.
+# Local preconfigure fragment for sysdeps/mips
+
+case "$machine" in
+mips*)
+	abiflag=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define _MIPS_SIM \(.*\)/\1/p'`
+	mips16flag=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __mips16 \(.*\)/\1/p'`
+
+	base_machine=mips
+	if test "$abiflag" = "_ABIO32" ; then
+		if test "$mips16flag" = "1" ; then
+			machine=mips/mips32/mips16
+		else
+			machine=mips/mips32
+		fi
+	elif test "$abiflag" = "_ABIN32" ; then
+		machine=mips/mips64/n32
+	elif test "$abiflag" = "_ABI64" ; then
+		machine=mips/mips64/n64
+	else
+		AC_MSG_ERROR([Unable to determine ABI.], [1])
+	fi
+	# $config_machine is not really needed here but the slash after
+	# $machine is needed by the case statement in
+	# sysdeps/unix/sysv/linux/mips/configure.ac.
+	machine=$machine/$config_machine
+
+	if test "$abiflag" != "_ABIO32" -a "$mips16flag" = "1"; then
+		AC_MSG_ERROR([MIPS16 is only supported with the o32 ABI.], [1])
+	fi
+
+	with_fp_cond="defined __mips_hard_float"
+	;;
+esac