[PATCH v4 05/20] remove AM_PROG_CC_C_O

[Tom Tromey <tromey at redhat dot com>]

While discussing an earlier revision of this patch series, we
discovered that bootstrapping gcc with a compiler that does not
support "-c -o" has not worked in a long time.

This patch removes the vestiges of this support from gcc itself.  This
is preparation for subsequent patches which break the support even
more.

	* Makefile.in (OUTPUT_OPTION): Define as "-o $@".
	* configure.ac: Don't invoke AM_PROG_CC_C_O.
	(NO_MINUS_C_MINUS_O, OUTPUT_OPTION): Don't subst.
	* configure, config.in: Rebuild.

	* gcc-interface/Makefile.in (OUTPUT_OPTION): Define as "-o $@".
---
 gcc/Makefile.in                   |   7 +-
 gcc/ada/gcc-interface/Makefile.in |   4 +-
 gcc/config.in                     |   6 --
 gcc/configure                     | 144 +-------------------------------------
 gcc/configure.ac                  |  10 ---
 5 files changed, 8 insertions(+), 163 deletions(-)

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 654f04b..a3ae57b 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -313,9 +313,10 @@ CCDEPMODE = @CCDEPMODE@
 DEPDIR = @DEPDIR@
 depcomp = $(SHELL) $(srcdir)/../depcomp
 
-# Some compilers can't handle cc -c blah.c -o foo/blah.o.
-# In stage2 and beyond, we force this to "-o $@" since we know we're using gcc.
-OUTPUT_OPTION = @OUTPUT_OPTION@
+# In the past we used AC_PROG_CC_C_O and set this properly, but
+# it was discovered that this hadn't worked in a long time, so now
+# we just hard-code.
+OUTPUT_OPTION = -o $@
 
 # This is where we get zlib from.  zlibdir is -L../zlib and zlibinc is
 # -I../zlib, unless we were configured with --with-system-zlib, in which
diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
index 4fd3682..2c51a00 100644
--- a/gcc/ada/gcc-interface/Makefile.in
+++ b/gcc/ada/gcc-interface/Makefile.in
@@ -1,5 +1,5 @@
 # Makefile for GNU Ada Compiler (GNAT).
-#   Copyright (C) 1994-2012 Free Software Foundation, Inc.
+#   Copyright (C) 1994-2013 Free Software Foundation, Inc.
 
 #This file is part of GCC.
 
@@ -122,7 +122,7 @@ THREAD_KIND = native
 THREADSLIB =
 GMEM_LIB =
 MISCLIB =
-OUTPUT_OPTION = @OUTPUT_OPTION@
+OUTPUT_OPTION = -o $@
 
 objext = .o
 exeext =
diff --git a/gcc/config.in b/gcc/config.in
index 44f9a32..7bb5be8 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -1717,12 +1717,6 @@
 #endif
 
 
-/* Define to 1 if your C compiler doesn't accept -c and -o together. */
-#ifndef USED_FOR_TARGET
-#undef NO_MINUS_C_MINUS_O
-#endif
-
-
 /* Define to the address where bug reports for this package should be sent. */
 #ifndef USED_FOR_TARGET
 #undef PACKAGE_BUGREPORT
diff --git a/gcc/configure b/gcc/configure
index d2c08f3..2ac0347 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -790,8 +790,6 @@ EGREP
 GREP
 CPP
 PICFLAG_FOR_TARGET
-OUTPUT_OPTION
-NO_MINUS_C_MINUS_O
 GNATMAKE
 GNATBIND
 ac_ct_CXX
@@ -4257,135 +4255,6 @@ ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
-if test "x$CC" != xcc; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC and cc understand -c and -o together" >&5
-$as_echo_n "checking whether $CC and cc understand -c and -o together... " >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether cc understands -c and -o together" >&5
-$as_echo_n "checking whether cc understands -c and -o together... " >&6; }
-fi
-set dummy $CC; ac_cc=`$as_echo "$2" |
-		      sed 's/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/'`
-if { as_var=ac_cv_prog_cc_${ac_cc}_c_o; eval "test \"\${$as_var+set}\" = set"; }; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main ()
-{
-
-  ;
-  return 0;
-}
-_ACEOF
-# Make sure it works both with $CC and with simple cc.
-# We do the test twice because some compilers refuse to overwrite an
-# existing .o file with -o, though they will create one.
-ac_try='$CC -c conftest.$ac_ext -o conftest2.$ac_objext >&5'
-rm -f conftest2.*
-if { { 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 $ac_status = 0; } &&
-   test -f conftest2.$ac_objext && { { 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 $ac_status = 0; };
-then
-  eval ac_cv_prog_cc_${ac_cc}_c_o=yes
-  if test "x$CC" != xcc; then
-    # Test first that cc exists at all.
-    if { ac_try='cc -c conftest.$ac_ext >&5'
-  { { 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 $ac_status = 0; }; }; then
-      ac_try='cc -c conftest.$ac_ext -o conftest2.$ac_objext >&5'
-      rm -f conftest2.*
-      if { { case "(($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 $ac_status = 0; } &&
-	 test -f conftest2.$ac_objext && { { 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 $ac_status = 0; };
-      then
-	# cc works too.
-	:
-      else
-	# cc exists but doesn't like -o.
-	eval ac_cv_prog_cc_${ac_cc}_c_o=no
-      fi
-    fi
-  fi
-else
-  eval ac_cv_prog_cc_${ac_cc}_c_o=no
-fi
-rm -f core conftest*
-
-fi
-if eval test \$ac_cv_prog_cc_${ac_cc}_c_o = yes; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-
-$as_echo "#define NO_MINUS_C_MINUS_O 1" >>confdefs.h
-
-fi
-
-# expand $ac_aux_dir to an absolute path
-am_aux_dir=`cd $ac_aux_dir && pwd`
-
-# FIXME: we rely on the cache variable name because
-# there is no other way.
-set dummy $CC
-am_cc=`echo $2 | sed 's/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/'`
-eval am_t=\$ac_cv_prog_cc_${am_cc}_c_o
-if test "$am_t" != yes; then
-   # Losing compiler, so override with the script.
-   # FIXME: It is wrong to rewrite CC.
-   # But if we don't then we get into trouble of one sort or another.
-   # A longer-term fix would be to have automake use am__CC in this case,
-   # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
-   CC="$am_aux_dir/compile $CC"
-fi
-
-
 ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
 ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -4863,15 +4732,6 @@ else
 fi
 
 
-# autoconf is lame and doesn't give us any substitution variable for this.
-if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = no"; then
-  NO_MINUS_C_MINUS_O=yes
-else
-  OUTPUT_OPTION='-o $@'
-fi
-
-
-
 # Remove the -O2: for historical reasons, unless bootstrapping we prefer
 # optimizations to be activated explicitly by the toplevel.
 case "$CC" in
@@ -18033,7 +17893,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18036 "configure"
+#line 17896 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18139,7 +17999,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18142 "configure"
+#line 18002 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index dc8b38b..f216962 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -278,19 +278,9 @@ rm -f a.out a.exe b.out
 
 # Find the native compiler
 AC_PROG_CC
-AM_PROG_CC_C_O
 AC_PROG_CXX
 ACX_PROG_GNAT([-I"$srcdir"/ada])
 
-# autoconf is lame and doesn't give us any substitution variable for this.
-if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = no"; then
-  NO_MINUS_C_MINUS_O=yes
-else
-  OUTPUT_OPTION='-o $@'
-fi
-AC_SUBST(NO_MINUS_C_MINUS_O)
-AC_SUBST(OUTPUT_OPTION)
-
 # Remove the -O2: for historical reasons, unless bootstrapping we prefer
 # optimizations to be activated explicitly by the toplevel.
 case "$CC" in
-- 
1.8.1.4