A patch required to build GCC 1.27 on a modern system

gcc-1.27.patch

diff --git a/Makefile b/Makefile
index ee02e0f..25a4aa5 100644
--- a/Makefile
+++ b/Makefile
@@ -373,19 +373,19 @@ maketest:
 stage1: force
 	-mkdir stage1
 	mv $(STAGESTUFF) $(STAGE_GCC) stage1
-	-rm stage1/gnulib
+	-rm -f stage1/gnulib
 	-ln gnulib stage1 || cp gnulib stage1
 
 stage2: force
 	-mkdir stage2
 	mv $(STAGESTUFF) $(STAGE_GCC) stage2
-	-rm stage2/gnulib
+	-rm -f stage2/gnulib
 	-ln gnulib stage2 || cp gnulib stage2
 
 stage3: force
 	-mkdir stage3
 	mv $(STAGESTUFF) $(STAGE_GCC) stage3
-	-rm stage3/gnulib
+	-rm -f stage3/gnulib
 	-ln gnulib stage3 || cp gnulib stage3
 
 #In GNU Make, ignore whether `stage*' exists.
diff --git a/cccp.c b/cccp.c
index f53d438..c64f339 100644
--- a/cccp.c
+++ b/cccp.c
@@ -129,6 +129,7 @@ typedef unsigned char U_CHAR;
 #include <sys/stat.h>
 #include <ctype.h>
 #include <stdio.h>
+#include <errno.h>
 
 #ifndef VMS
 #include <sys/file.h>
@@ -5009,9 +5010,6 @@ void
 perror_with_name (name)
      char *name;
 {
-  extern int errno, sys_nerr;
-  extern char *sys_errlist[];
-
   fprintf (stderr, "%s: ", progname);
   if (errno < sys_nerr)
     fprintf (stderr, "%s for `%s'\n", sys_errlist[errno], name);
diff --git a/expr.c b/expr.c
index f67db1a..01daa97 100644
--- a/expr.c
+++ b/expr.c
@@ -3619,7 +3619,7 @@ expand_call (exp, target, ignore)
       INIT_CUMULATIVE_ARGS (args_so_far, funtype);
       tem = FUNCTION_ARG (args_so_far, Pmode,
 			  build_pointer_type (TREE_TYPE (funtype)), 1);
-      if (GET_CODE (tem) == MEM)
+      if (tem != 0 && GET_CODE (tem) == MEM)
 	{
 	  actparms = tree_cons (error_mark_node,
 				build (SAVE_EXPR,
diff --git a/gcc.c b/gcc.c
index 66e035c..c9fefc2 100644
--- a/gcc.c
+++ b/gcc.c
@@ -117,6 +117,7 @@ position among the other output files.
 #include <sys/types.h>
 #include <signal.h>
 #include <sys/file.h>
+#include <errno.h>
 #include "config.h"
 #include "obstack.h"
 
@@ -1217,8 +1218,6 @@ save_string (s, len)
 pfatal_with_name (name)
      char *name;
 {
-  extern int errno, sys_nerr;
-  extern char *sys_errlist[];
   char *s;
 
   if (errno < sys_nerr)
@@ -1231,8 +1230,6 @@ pfatal_with_name (name)
 perror_with_name (name)
      char *name;
 {
-  extern int errno, sys_nerr;
-  extern char *sys_errlist[];
   char *s;
 
   if (errno < sys_nerr)
diff --git a/output-i386.c b/output-i386.c
index 748628d..0e29ca3 100644
--- a/output-i386.c
+++ b/output-i386.c
@@ -339,7 +339,7 @@ fp_push_df (x)
     output_asm_insn ("fld%Q %0", &x);
 }
 
-char *output_move_const_single ();
+static char *output_move_const_single ();
 
 static char *
 singlemove_string (operands)
diff --git a/sdbout.c b/sdbout.c
index 4e6cca5..2979ef0 100644
--- a/sdbout.c
+++ b/sdbout.c
@@ -27,7 +27,7 @@ and this notice must be preserved on all copies.  */
 #include "rtl.h"
 #include "c-tree.h"
 #include <stdio.h>
-#include <syms.h>
+#include "syms.h"
 /* #include <storclass.h>  used to be this instead of syms.h.  */
 
 /* Line number of beginning of current function, minus one.  */
@@ -43,7 +43,7 @@ extern FILE *asm_out_file;
 extern tree current_function_decl;
 
 void sdbout_init ();
-void sdbout_syms ();
+static void sdbout_syms ();
 void sdbout_symbol ();
 void sdbout_tags();
 void sdbout_types();
diff --git a/stdarg.h b/stdarg.h
index a5ef31a..50f3d48 100644
--- a/stdarg.h
+++ b/stdarg.h
@@ -19,4 +19,7 @@ void va_end (va_list);		/* Defined in gnulib */
  (AP += __va_rounded_size (TYPE),					\
   *((TYPE *) (AP - __va_rounded_size (TYPE))))
 
+typedef va_list __gnuc_va_list;
+#define _VA_LIST_DEFINED
+
 #endif /* _STDARG_H */
diff --git a/stddef.h b/stddef.h
index 991b45d..f141d35 100644
--- a/stddef.h
+++ b/stddef.h
@@ -7,7 +7,7 @@ typedef long ptrdiff_t;
 
 /* Unsigned type of `sizeof' something.  */
 
-typedef unsigned long size_t;
+typedef unsigned int size_t;
 
 /* A null pointer constant.  */
 
diff --git a/tm-i386v.h b/tm-i386v.h
index 832caea..68dfe61 100644
--- a/tm-i386v.h
+++ b/tm-i386v.h
@@ -32,9 +32,10 @@ and this notice must be preserved on all copies.  */
 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
 
 #define STARTFILE_SPEC  \
-  "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
+  "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} crti.o%s"
 
-#define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} crtn.o%s"
+#define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} crtn.o%s" \
+    " -dynamic-linker ld-linux.so.2%s"
 
 /* Specify predefined symbols in preprocessor.  */
 
--- stddef.h
+++ stddef.h
@@ -7,7 +7,7 @@
 
 /* Unsigned type of `sizeof' something.  */
 
-typedef unsigned int size_t;
+//typedef unsigned int size_t;
 
 /* A null pointer constant.  */