[newlib-cygwin] libgloss: m68k: switch to AC_NO_EXECUTABLES

[Michael Frysinger <vapier@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=7d565fe0133a8c0ae86c21c515b1aa47a03ddd0c

commit 7d565fe0133a8c0ae86c21c515b1aa47a03ddd0c
Author: Mike Frysinger <vapier@gentoo.org>
Date:   Fri Feb 11 06:58:43 2022 -0500

    libgloss: m68k: switch to AC_NO_EXECUTABLES
    
    Use this macro rather than hacking up the LDFLAGS settings.  This will
    make it easier to merge the logic into the top-level which is already
    using AC_NO_EXECUTABLES.

Diff:
---
 libgloss/m68k/configure    | 82 ++++++++++++++++++++++++++++++++++++++++++++--
 libgloss/m68k/configure.ac | 10 ++----
 2 files changed, 81 insertions(+), 11 deletions(-)

diff --git a/libgloss/m68k/configure b/libgloss/m68k/configure
index f5ecb8280..9420a642b 100755
--- a/libgloss/m68k/configure
+++ b/libgloss/m68k/configure
@@ -582,6 +582,7 @@ PACKAGE_BUGREPORT=
 PACKAGE_URL=
 
 ac_unique_file="crt0.S"
+ac_no_link=no
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 multi_basedir
@@ -2598,11 +2599,11 @@ test "${CCASFLAGS+set}" = set || CCASFLAGS=$CFLAGS
 
 
 
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking target cpu family" >&5
 $as_echo_n "checking target cpu family... " >&6; }
 TARGET=m68k
-saved_LDFLAGS="$LDFLAGS"
-LDFLAGS="-nostdlib -e main"
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -2934,6 +2935,29 @@ done
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if { { ac_try="$ac_link"
+case "(($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_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  ac_no_link=no
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
 int
 main ()
 {
@@ -3130,6 +3154,59 @@ $as_echo "$cross_compiling" >&6; }
 
 rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
 ac_clean_files=$ac_clean_files_save
+
+else
+  rm -f -r a.out a.exe b.out conftest.$ac_ext conftest.o conftest.obj conftest.dSYM
+  ac_no_link=yes
+  # Setting cross_compile will disable run tests; it will
+  # also disable AC_CHECK_FILE but that's generally
+  # correct if we can't link.
+  cross_compiling=yes
+  EXEEXT=
+  # Check that the compiler produces executables we can run.  If not, either
+# the compiler is broken, or we cross compile.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are cross compiling" >&5
+$as_echo_n "checking whether we are cross compiling... " >&6; }
+if test "$cross_compiling" != yes; then
+  { { ac_try="$ac_link"
+case "(($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_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+  if { ac_try='./conftest$ac_cv_exeext'
+  { { 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_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+    cross_compiling=no
+  else
+    if test "$cross_compiling" = maybe; then
+	cross_compiling=yes
+    else
+	{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run C compiled programs.
+If you meant to cross compile, use \`--host'.
+See \`config.log' for more details" "$LINENO" 5; }
+    fi
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $cross_compiling" >&5
+$as_echo "$cross_compiling" >&6; }
+
+fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
 $as_echo_n "checking for suffix of object files... " >&6; }
 if ${ac_cv_objext+:} false; then :
@@ -3565,7 +3642,6 @@ if ac_fn_c_try_cpp "$LINENO"; then :
   TARGET="fido"
 fi
 rm -f conftest.err conftest.i conftest.$ac_ext
-LDFLAGS=$saved_LDFLAGS
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $TARGET" >&5
 $as_echo "$TARGET" >&6; }
 
diff --git a/libgloss/m68k/configure.ac b/libgloss/m68k/configure.ac
index 41b49a530..0230e08d8 100644
--- a/libgloss/m68k/configure.ac
+++ b/libgloss/m68k/configure.ac
@@ -30,15 +30,10 @@ AC_SUBST(LD)
 AC_PROG_RANLIB
 LIB_AM_PROG_AS
 
+AC_NO_EXECUTABLES
+
 AC_MSG_CHECKING([target cpu family])
 TARGET=m68k
-dnl Temporarily modify LDFLAGS so that link tests will succeed without
-dnl a C library.  Note that we may not have a C librabry yet and that
-dnl autoconf automatically adds script to check whether we can create
-dnl an executable or not.
-dnl
-saved_LDFLAGS="$LDFLAGS"
-LDFLAGS="-nostdlib -e main"
 AC_PREPROC_IFELSE([AC_LANG_PROGRAM([#ifndef __mcoldfire__
 		#error we are not coldfire
 		#endif])],
@@ -47,7 +42,6 @@ AC_PREPROC_IFELSE([AC_LANG_PROGRAM([#ifndef __mfido__
 		#error we are not fido
 		#endif])],
 	       TARGET="fido",)
-LDFLAGS=$saved_LDFLAGS
 AC_MSG_RESULT($TARGET)
 AC_SUBST(TARGET)