What you need to build the kernel, and user binaries
----------------------------------------------------

binutils 2.8.1
--------------
1.To build elf binutils to compile the kernel:
----------------------------------------------
configure --prefix=/home/gcc --target=m68k-unknown-linux --nfp
Change MAKEINFO in Makefile to /bin/true, if you don't have makeinfo
make
make install

2.To build coff-pic binutils to compile user binaries:
------------------------------------------------------
configure --prefix=/home/gcc --target=m68k-pic-coff
Change MAKEINFO in Makefile to /bin/true, if you don't have makeinfo
make
make install

gcc-2.7.2.2
-----------
1.To build elf gcc to compile the kernel:
-----------------------------------------
You have to undefine mc68020 multiplications in longlong.h, or it will
generate 68020+ mul and divs (line 428: #if defined(__mc68020).. 
should become #if 0...

configure --prefix=/home/gcc --target=m68k-unknown-linux --with-gnu-as 
        --with-gnu-ld --local-prefix=/home/gcc --nfp

Patch the generated Makefile as follows:


--- Makefile.orig       Tue Feb 24 12:39:23 1998
+++ Makefile    Tue Feb 24 12:38:29 1998
@@ -36,7 +36,7 @@
 
 # Selection of languages to be made.
 # This is overridden by configure.
-LANGUAGES = c objective-c proto  c++
+LANGUAGES = c
 
 ALLOCA =
 ALLOCA_FLAGS =
@@ -48,7 +48,7 @@
 # to the stage2 and stage3 compilations
 # XCFLAGS is used for most compilations but not when using the GCC just built.
 XCFLAGS =
-CFLAGS = -g
+CFLAGS = 
 BOOT_CFLAGS = -O $(CFLAGS)
 # These exists to be overridden by the x-* and t-* files, respectively.
 X_CFLAGS =
@@ -57,7 +57,7 @@
 X_CPPFLAGS =
 T_CPPFLAGS =
 
-CC = cc
+CC = gcc
 BISON = bison
 BISONFLAGS =
 LEX = flex
@@ -71,7 +71,7 @@
 # These permit overriding just for certain files.
 INSTALL_PROGRAM = $(INSTALL)
 INSTALL_DATA = $(INSTALL)
-MAKEINFO = makeinfo
+MAKEINFO = /bin/true
 TEXI2DVI = texi2dvi
 # For GNUmake: let us decide what gets passed to recursive makes.
 MAKEOVERRIDES =
@@ -122,7 +122,7 @@
 # The GCC to use for compiling libgcc2.a, enquire, and libgcc1-test.
 # Usually the one we just built.
 # Don't use this as a dependency--use $(GCC_PASSES) or $(GCC_PARTS).
-GCC_FOR_TARGET = ./xgcc -B./
+GCC_FOR_TARGET = ./xgcc -msoft-float -mc68000 -Wa,-mc68000 -B./
 
 # This is used instead of ALL_CFLAGS when compiling with GCC_FOR_TARGET.
 # It omits XCFLAGS, and specifies -B./.
@@ -233,11 +233,18 @@
 # Specify the rule for actually making libgcc1.a.
 # The value may be empty; that means to do absolutely nothing
 # with or for libgcc1.a.
-LIBGCC1 = libgcc1.a
+LIBGCC1 = libgcc1-asm.a
 
 # Specify the rule for making libgcc1.a for a cross-compiler.
 # The default rule assumes that libgcc1.a is supplied by the user.
-CROSS_LIBGCC1 = libgcc1.cross
+CROSS_LIBGCC1 = libgcc1-asm.a
+LIB1ASMSRC = m68k/lb1sf68.asm
+LIB1ASMFUNCS = _mulsi3 _udivsi3 _divsi3 _umodsi3 _modsi3 \
+   _double _float _floatex \
+   _eqdf2 _nedf2 _gtdf2 _gedf2 _ltdf2 _ledf2 \
+   _eqsf2 _nesf2 _gtsf2 _gesf2 _ltsf2 _lesf2
+
+
 
 # Specify the rule for actually making libgcc2.a.
 LIBGCC2 = libgcc2.a
@@ -395,8 +402,8 @@
 # sed inserts variable overrides after the following line.
 ####target overrides
 # Don't make libgcc1.a
-LIBGCC1 =
-CROSS_LIBGCC1 =
+#LIBGCC1 =
+#CROSS_LIBGCC1 =
 # On Linux we can print long double
 ENQUIRE_CFLAGS = -DNO_MEM -O0
 ####host overrides
@@ -610,11 +617,12 @@
    _eqsf2 _nesf2 _gtsf2 _gesf2 _ltsf2 _lesf2
 
 # Library members defined in libgcc2.c.
+LIB2TRICKY = _floatdixf
 LIB2FUNCS = _muldi3 _divdi3 _moddi3 _udivdi3 _umoddi3 _negdi2 \
      _lshrdi3 _ashldi3 _ashrdi3 _ffsdi2 \
     _udiv_w_sdiv _udivmoddi4 _cmpdi2 _ucmpdi2 _floatdidf _floatdisf \
     _fixunsdfsi _fixunssfsi _fixunsdfdi _fixdfdi _fixunssfdi _fixsfdi \
-    _fixxfdi _fixunsxfdi _floatdixf _fixunsxfsi \
+    _fixxfdi _fixunsxfdi _fixunsxfsi \
     _fixtfdi _fixunstfdi _floatditf \
     __gcc_bcmp _varargs _eprintf _op_new _op_vnew _new_handler _op_delete \
     _op_vdel _bb _shtab _clear_cache _trampoline __main _exit _ctors _eh \
@@ -1093,6 +1101,15 @@
          $(AR) $(AR_FLAGS) tmplibgcc1.a $${name}$(objext); \
          rm -f $${name}$(objext); \
        done
+       for name in _truncdfsf2 _extendsfdf2 _fixdfsi _fixsfsi _floatsidf _floatsisf; \
+        do \
+          echo $${name}; \
+          $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) $(INCLUDES) -c -DL$${name} libgcc1.c; \
+          if [ $$? -eq 0 ] ; then true; else exit 1; fi; \
+          mv libgcc1$(objext) $${name}$(objext); \
+          $(AR) $(AR_FLAGS) tmplibgcc1.a $${name}$(objext); \
+          rm -f $${name}$(objext); \
+        done
        -rm -f libgcc1.S
        mv tmplibgcc1.a libgcc1-asm.a
 
@@ -1138,7 +1155,7 @@
        do \
          echo $${name}; \
          $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) $(INCLUDES) -c -DL$${name} \
-             $(srcdir)/libgcc2.c -o $${name}$(objext); \
+             $(srcdir)/libgcc2.c -I/usr/include -o $${name}$(objext); \
          if [ $$? -eq 0 ] ; then true; else exit 1; fi; \
          $(AR) $(AR_FLAGS) tmplibgcc2.a $${name}$(objext); \
          rm -f $${name}$(objext); \



1.To build a pic-coff gcc to compile user binaries:
---------------------------------------------------
configure --prefix=/home/gcc --target=m68k-pic-coff --with-gnu-as
        --with-gnu-ld --local-prefix=/home/gcc --nfp

make
make install

---------------------------
Paul Coene