Set linker-related things with configure.

* configure.in (LINKER, YMF_PASS_LDFLAGS): New output variables.
(ORDINARY_LINK): New AC_DEFINE.
(LIB_GCC): No need to set if ORDINARY_LINK.

* src/Makefile.in (LD, YMF_PASS_LDFLAGS): Set with configure, not cpp.
(GNULIB_VAR): Remove.
(LIBES): Use LIB_GCC instead of GNULIB_VAR.

* src/m/ibms390x.h (LINKER):
* src/m/macppc.h (LINKER) [GNU_LINUX]:
* src/s/aix4-2.h (ORDINARY_LINK):
* src/s/cygwin.h (LINKER):
* src/s/darwin.h (ORDINARY_LINK):
* src/s/gnu.h (ORDINARY_LINK):
* src/s/netbsd.h (LINKER):
* src/s/usg5-4.h (ORDINARY_LINK):
Move to configure.

* msdos/sed1v2.inp (LD): Edit to $(CC).
(YMF_PASS_LDFLAGS): Edit to `flags'.

14 files changed, 104 insertions, 75 deletions

diff --git a/ChangeLog b/ChangeLog
index eb3ed433d0a..d51d9afc3a6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-05-19  Glenn Morris  <rgm@gnu.org>
+
+        * configure.in (LINKER, YMF_PASS_LDFLAGS): New output variables.
+        (ORDINARY_LINK): New AC_DEFINE.
+        (LIB_GCC): No need to set if ORDINARY_LINK.
+
 2010-05-18  Glenn Morris  <rgm@gnu.org>
 
         * configure.in (POST_ALLOC_OBJ) [cygwin]: Omit vm-limit.o.
diff --git a/configure.in b/configure.in
index 57fb0548f53..5d168d77886 100644
--- a/configure.in
+++ b/configure.in
@@ -3277,8 +3277,75 @@ fi
 AC_SUBST(LD_SWITCH_SYSTEM_EXTRA)
 
 
+LINKER=
+ORDINARY_LINK=
+case "$opsys" in
+  ## gnu: GNU needs its own crt0.
+  aix4-2|darwin|gnu|usg5-4|irix6-5|sol2*|unixware) ORDINARY_LINK=yes ;;
+
+  cygwin) LINKER="\$(CC)" ;;
+
+  ## On post 1.3 releases of NetBSD, gcc -nostdlib also clears the
+  ## library search parth, i.e. it won't search /usr/lib for libc and
+  ## friends.  Using -nostartfiles instead avoids this problem, and
+  ## will also work on earlier NetBSD releases.
+  netbsd|openbsd) LINKER="\$(CC) -nostartfiles" ;;
+
+  ## macpcc: NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp> says
+  ##   MkLinux/LinuxPPC needs this.
+  ## ibms390x only supports opsys = gnu-linux so it can be added here.
+  gnu-*)
+    case "$machine" in
+      macppc|ibms390x) LINKER="\$(CC) -nostdlib" ;;
+    esac
+    ;;
+esac
+
+## A macro which other sections of Makefile can redefine to munge the
+## flags before they are passed to LD.  This is helpful if you have
+## redefined LD to something odd, like "gcc".
+## (The YMF prefix is a holdover from the old name "ymakefile".) 
+YMF_PASS_LDFLAGS=flags
+if test "x$ORDINARY_LINK" = "xyes"; then
+
+  LINKER="\$(CC)"
+  AC_DEFINE(ORDINARY_LINK, 1, [Define if the C compiler is the linker.])
+
+## The system files defining neither ORDINARY_LINK nor LINKER are:
+## (bsd-common), freebsd, gnu-* not on macppc|ibms390x, hpux*.
+elif test "x$GCC" = "xyes" && test "x$LINKER" = "x"; then
+
+  ## Versions of GCC >= 2.0 put their library, libgcc.a, in obscure
+  ## places that are difficult to figure out at make time.  Fortunately,
+  ## these same versions allow you to pass arbitrary flags on to the
+  ## linker, so there is no reason not to use it as a linker.
+  ##
+  ## Well, it is not quite perfect.  The "-nostdlib" keeps GCC from
+  ## searching for libraries in its internal directories, so we have to
+  ## ask GCC explicitly where to find libgcc.a (LIB_GCC below).
+  LINKER="\$(CC) -nostdlib"
+  ## GCC passes any argument prefixed with -Xlinker directly to the linker.
+  ## See prefix-args.c for an explanation of why we do not do this with the
+  ## shell''s ``for'' construct.  Note that sane people do not have '.' in
+  ## their paths, so we must use ./prefix-args.
+  ## TODO either make prefix-args check ORDINARY_LINK internally,
+  ## or remove it altogether (bug#6184), removing the need for this macro.
+  YMF_PASS_LDFLAGS='`./prefix-args -Xlinker flags`'
+fi
+AC_SUBST(YMF_PASS_LDFLAGS)
+
+test "x$LINKER" = "x" && LINKER=ld
+## FIXME? What setting of YMF_PASS_LDFLAGS should this have?
+test "$NS_IMPL_GNUSTEP" = "yes" && LINKER="\$(CC) -rdynamic"
+
+AC_SUBST(LINKER)
+
+
+## FIXME? The logic here is not precisely the same as that above
+## setting YMF_PASS_LDFLAGS.  There is no check here for a pre-defined
+## LINKER.  Should we only be setting LIB_GCC if LD ~ -nostdlib?
 LIB_GCC=
-if test "x$GCC" = "xyes"; then
+if test "x$GCC" = "xyes" && test "x$ORDINARY_LINK" != "xyes"; then
 
   case "$opsys" in
     ## cygwin: don't link against static libgcc.
diff --git a/msdos/ChangeLog b/msdos/ChangeLog
index fd320d85920..cbc018dffe6 100644
--- a/msdos/ChangeLog
+++ b/msdos/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-19  Glenn Morris  <rgm@gnu.org>
+
+        * sed1v2.inp (LD): Edit to $(CC).
+        (YMF_PASS_LDFLAGS): Edit to `flags'.
+
 2010-05-18  Eli Zaretskii  <eliz@gnu.org>
 
         * sed1x.inp: Add copyright notice.
diff --git a/msdos/sed1v2.inp b/msdos/sed1v2.inp
index 574910d2beb..7b9b77309df 100644
--- a/msdos/sed1v2.inp
+++ b/msdos/sed1v2.inp
@@ -55,6 +55,7 @@ s/\.h\.in/.h-in/
 /^TEMACS_LDFLAGS2 *=/s/@TEMACS_LDFLAGS2@/$(LDFLAGS)/
 /^LIBS_SYSTEM *=/s/@LIBS_SYSTEM@//
 /^LIB_GCC *=/s/@LIB_GCC@/-Lgcc/
+/^LD *=/s/@LINKER@/$(CC)/
 /^LIB_STANDARD *=/s/@LIB_STANDARD@//
 /^LIB_MATH *=/s/@LIB_MATH@/-lm/
 /^LIBTIFF *=/s/@LIBTIFF@//
@@ -143,6 +144,7 @@ s/\.h\.in/.h-in/
 /^      @: /d
 /^      -\{0,1\}ln -/s/ln -f/cp -pf/
 /^[     ]touch /s/touch/djecho $@ >/
+s/@YMF_PASS_LDFLAGS@/flags/
 s/bootstrap-emacs/b-emacs/
 s/bootstrap-temacs/b-temacs/
 s/bootstrap-doc/b-doc/
diff --git a/src/ChangeLog b/src/ChangeLog
index 1fbfcb314ef..5d1c53bf7ba 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,19 @@
 2010-05-19  Glenn Morris  <rgm@gnu.org>
 
+        * Makefile.in (LD, YMF_PASS_LDFLAGS): Set with configure, not cpp.
+        (GNULIB_VAR): Remove.
+        (LIBES): Use LIB_GCC instead of GNULIB_VAR.
+
+        * m/ibms390x.h (LINKER):
+        * m/macppc.h (LINKER) [GNU_LINUX]:
+        * s/aix4-2.h (ORDINARY_LINK):
+        * s/cygwin.h (LINKER):
+        * s/darwin.h (ORDINARY_LINK):
+        * s/gnu.h (ORDINARY_LINK):
+        * s/netbsd.h (LINKER):
+        * s/usg5-4.h (ORDINARY_LINK):
+        Move to configure.
+
         * s/aix4-2.h (LINKER): Remove; this file sets ORDINARY_LINK.
 
 2010-05-18  Chong Yidong  <cyd@stupidchicken.com>
diff --git a/src/Makefile.in b/src/Makefile.in
index 676d2a0834e..bab812e656f 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -124,6 +124,8 @@ LIBS_SYSTEM=@LIBS_SYSTEM@
 ## Where to find libgcc.a, if using gcc and necessary.
 LIB_GCC=@LIB_GCC@
 
+LD=@LINKER@
+
 ## May use $CRT_DIR.
 LIB_STANDARD=@LIB_STANDARD@
 
@@ -329,52 +331,6 @@ ALL_OBJC_CFLAGS=$(ALL_CFLAGS) $(GNU_OBJC_CFLAGS)
         $(CC) -c $(CPPFLAGS) $(ALL_OBJC_CFLAGS) $<
 
 
-/* A macro which other sections of Makefile can redefine to munge the
-   flags before they are passed to LD.  This is helpful if you have
-   redefined LD to something odd, like "gcc".
-   (The YMF prefix is a holdover from the old name "ymakefile".)  */
-#define YMF_PASS_LDFLAGS(flags) flags
-
-
-#ifdef ORDINARY_LINK
-LD = $(CC)
-
-#else /* not ORDINARY_LINK */
-GNULIB_VAR = $(LIB_GCC)
-
-/* Fix linking if compiled with GCC.  */
-#if defined (__GNUC__) && ! defined (LINKER)
-/* Versions of GCC >= 2.0 put their library, libgcc.a, in obscure
-   places that are difficult to figure out at make time.  Fortunately,
-   these same versions allow you to pass arbitrary flags on to the
-   linker, so there is no reason not to use it as a linker.
-
-   Well, it is not quite perfect.  The "-nostdlib" keeps GCC from
-   searching for libraries in its internal directories, so we have to
-   ask GCC explicitly where to find libgcc.a.  */
-#define LINKER $(CC) -nostdlib
-/* GCC passes any argument prefixed with -Xlinker directly to the linker.
-   See prefix-args.c for an explanation of why we do not do this with the
-   shell''s ``for'' construct.  Note that sane people do not have '.' in
-   their paths, so we must use ./prefix-args.  */
-#undef YMF_PASS_LDFLAGS
-#define YMF_PASS_LDFLAGS(flags) `./prefix-args -Xlinker flags`
-#endif /* defined (__GNUC__) && ! defined (LINKER) */
-
-#ifdef LINKER
-LD=LINKER
-#else /* not LINKER */
-LD=ld
-#endif /* not LINKER */
-
-#endif /* not ORDINARY_LINK */
-
-
-#ifdef NS_IMPL_GNUSTEP
-LD=$(CC) -rdynamic
-#endif
-
-
 /* lastfile must follow all files whose initialized data areas should
    be dumped as pure by dump-emacs.  */
 obj=    dispnew.o frame.o scroll.o xdisp.o menu.o $(XMENU_OBJ) window.o \
@@ -634,13 +590,13 @@ SOME_MACHINE_LISP = ../lisp/mouse.elc \
 /* Construct full set of libraries to be linked.
    Note that SunOS needs -lm to come before -lc; otherwise, you get
    duplicated symbols.  If the standard libraries were compiled
-   with GCC, we might need gnulib again after them.  */
+   with GCC, we might need LIB_GCC again after them.  */
 
 LIBES = $(LOADLIBES) $(LIBS) $(LIBX_BASE) $(LIBX_OTHER) $(LIBSOUND) \
    $(RSVG_LIBS) $(DBUS_LIBS) $(LIBGPM) $(LIBRESOLV) $(LIBS_SYSTEM) \
    $(LIBS_TERMCAP) $(GETLOADAVG_LIBS) ${GCONF_LIBS} ${LIBSELINUX_LIBS} \
    $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
-   $(GNULIB_VAR) $(LIB_MATH) $(LIB_STANDARD) $(GNULIB_VAR)
+   $(LIB_GCC) $(LIB_MATH) $(LIB_STANDARD) $(LIB_GCC)
 
 all: emacs${EXEEXT} $(OTHER_FILES)
 
@@ -682,6 +638,8 @@ ${libsrc}make-docfile${EXEEXT}:
 buildobj.h: Makefile
         echo "#define BUILDOBJ \"${obj} ${otherobj} " "\"" > buildobj.h
 
+#define YMF_PASS_LDFLAGS(flags) @YMF_PASS_LDFLAGS@
+
 temacs${EXEEXT}: $(START_FILES) stamp-oldxmenu ${obj} ${otherobj} prefix-args${EXEEXT}
         $(LD) YMF_PASS_LDFLAGS ( ${TEMACS_LDFLAGS} \
           ${NS_IMPL_GNUSTEP_TEMACS_LDFLAGS} ) \
diff --git a/src/m/ibms390x.h b/src/m/ibms390x.h
index fda3007cb74..d6aa0c713c6 100644
--- a/src/m/ibms390x.h
+++ b/src/m/ibms390x.h
@@ -62,8 +62,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* On the 64 bit architecture, we can use 60 bits for addresses */
 #define VALBITS         60
 
-#define LINKER $(CC) -nostdlib
-
 /* Define XPNTR to avoid or'ing with DATA_SEG_BITS */
 #define XPNTR(a) XUINT (a)
 
diff --git a/src/m/macppc.h b/src/m/macppc.h
index b9dcf3bdc92..f348286030c 100644
--- a/src/m/macppc.h
+++ b/src/m/macppc.h
@@ -32,12 +32,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define HAVE_TEXT_START
 #endif
 
-/* NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp> says this is needed
-   For MkLinux/LinuxPPC.  */
-#ifdef GNU_LINUX
-#define LINKER $(CC) -nostdlib
-#endif
-
 #ifdef _ARCH_PPC64
 #ifndef _LP64
 #define _LP64
diff --git a/src/s/aix4-2.h b/src/s/aix4-2.h
index 9963e5744bf..5212c432843 100644
--- a/src/s/aix4-2.h
+++ b/src/s/aix4-2.h
@@ -106,7 +106,5 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #define UNEXEC unexaix.o
 
-#define ORDINARY_LINK
-
 /* arch-tag: 38fe75ea-6aef-42bd-8449-bc34d921a562
    (do not change this comment) */
diff --git a/src/s/cygwin.h b/src/s/cygwin.h
index e2afb7ddc44..b6d0c7c88ff 100644
--- a/src/s/cygwin.h
+++ b/src/s/cygwin.h
@@ -1,7 +1,7 @@
 /* System description header file for Cygwin.
 
 Copyright (C) 1985, 1986, 1992, 1999, 2002, 2003, 2004, 2005, 2006,
-  2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+  2007, 2008, 2009, 2010  Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
 
@@ -19,7 +19,7 @@ You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* SYSTEM_TYPE should indicate the kind of system you are using.
- It sets the Lisp variable system-type.  */
+   It sets the Lisp variable system-type.  */
 #define SYSTEM_TYPE "cygwin"
 
 /* Emacs can read input using SIGIO and buffering characters itself,
@@ -94,7 +94,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
 #define SYSV_SYSTEM_DIR 1
 #define UNEXEC unexcw.o
-#define LINKER $(CC)
 
 #define HAVE_SOCKETS
 
diff --git a/src/s/darwin.h b/src/s/darwin.h
index 76c0054cd3f..a30360576a8 100644
--- a/src/s/darwin.h
+++ b/src/s/darwin.h
@@ -147,9 +147,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #undef HAVE_POSIX_MEMALIGN
 #endif
 
-/* Link this program just by running cc.  */
-#define ORDINARY_LINK
-
 /* Define the following so emacs symbols will not conflict with those
    in the System framework.  Otherwise -prebind will not work.  */
 
diff --git a/src/s/gnu.h b/src/s/gnu.h
index cb4c4a9d807..4567f4e9f4f 100644
--- a/src/s/gnu.h
+++ b/src/s/gnu.h
@@ -29,8 +29,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #define SIGNALS_VIA_CHARACTERS
 
-/* GNU needs its own crt0, and libc defines data_start.  */
-#define ORDINARY_LINK
+/* libc defines data_start.  */
 #define DATA_START ({ extern int data_start; (char *) &data_start; })
 
 /* Some losing code fails to include this and then assumes
diff --git a/src/s/netbsd.h b/src/s/netbsd.h
index 4874ec9af56..af8fd00a6bd 100644
--- a/src/s/netbsd.h
+++ b/src/s/netbsd.h
@@ -26,12 +26,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
 
-/* On post 1.3 releases of NetBSD, gcc -nostdlib also clears
-   the library search parth, i.e. it won't search /usr/lib
-   for libc and friends.  Using -nostartfiles instead avoids
-   this problem, and will also work on earlier NetBSD releases.  */
-#define LINKER $(CC) -nostartfiles
-
 #define DEFAULT_SOUND_DEVICE "/dev/audio"
 
 /* Greg A. Woods <woods@weird.com> says we must include signal.h
diff --git a/src/s/usg5-4.h b/src/s/usg5-4.h
index f870086368c..85499fb1124 100644
--- a/src/s/usg5-4.h
+++ b/src/s/usg5-4.h
@@ -69,8 +69,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* On USG systems signal handlers return void.  */
 #define SIGTYPE void
 
-#define ORDINARY_LINK
-
 /* Undump with ELF.  */
 #undef COFF