gcc.c (LINK_GCC_C_SEQUENCE_SPEC): New spec to override the gcc/c library…

gcc.c (LINK_GCC_C_SEQUENCE_SPEC): New spec to override the gcc/c library sequence passed to the linker.

2002-04-03  David S. Miller  <davem@redhat.com>

	* gcc.c (LINK_GCC_C_SEQUENCE_SPEC): New spec to override the gcc/c
	library sequence passed to the linker.
	(LINK_COMMAND_SPEC): Use it.
	* doc/tm.texi: Document it, and mention from LINK_COMMAND_SPEC as
	a macro a target can use to avoid overriding LINK_COMMAND_SPEC.
	* config/sparc/sparc.h (LINK_GCC_C_SEQUENCE_SPEC): Define.

From-SVN: r51834

gcc/ChangeLog

+2002-04-03  David S. Miller  <davem@redhat.com>
+
+	* gcc.c (LINK_GCC_C_SEQUENCE_SPEC): New spec to override the gcc/c
+	library sequence passed to the linker.
+	(LINK_COMMAND_SPEC): Use it.
+	* doc/tm.texi: Document it, and mention from LINK_COMMAND_SPEC as
+	a macro a target can use to avoid overriding LINK_COMMAND_SPEC.
+	* config/sparc/sparc.h (LINK_GCC_C_SEQUENCE_SPEC): Define.
+
 2002-04-03  Jason Merrill  <jason@redhat.com>
 
 	* except.c (struct eh_status): Remove protect_list.

gcc/config/sparc/sparc.h

@@ -358,6 +358,11 @@ Unrecognized value in TARGET_CPU_DEFAULT.
   SUBTARGET_EXTRA_SPECS
 
 #define SUBTARGET_EXTRA_SPECS
+
+/* Because libgcc can generate references back to libc (via .umul etc.) we have
+   to list libc again after the second libgcc.  */
+#define LINK_GCC_C_SEQUENCE_SPEC "%G %L %G %L"
+
 
 #ifdef SPARC_BI_ARCH
 #define NO_BUILTIN_PTRDIFF_TYPE

gcc/doc/tm.texi

@@ -377,6 +377,11 @@ the argument @option{-lgcc} to tell the linker to do the search.
 This macro is similar to @code{LINK_LIBGCC_SPECIAL}, except that it does
 not affect @option{-L} options.
 
+@findex LINK_GCC_C_SEQUENCE_SPEC
+@item LINK_GCC_C_SEQUENCE_SPEC
+The sequence in which libgcc and libc are specified to the linker.
+By default this is @code{%G %L %G}.
+
 @findex LINK_COMMAND_SPEC
 @item LINK_COMMAND_SPEC
 A C string constant giving the complete command line need to execute the
@@ -384,7 +389,8 @@ linker.  When you do this, you will need to update your port each time a
 change is made to the link command line within @file{gcc.c}.  Therefore,
 define this macro only if you need to completely redefine the command
 line for invoking the linker and there is no other way to accomplish
-the effect you need.
+the effect you need.  Overriding this macro may be avoidable by overriding
+@code{LINK_GCC_C_SEQUENCE_SPEC} instead.
 
 @findex LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 @item LINK_ELIMINATE_DUPLICATE_LDIRECTORIES

gcc/gcc.c

@@ -448,6 +448,7 @@ or with constant text in a single argument.
  %C     process CPP_SPEC as a spec.
  %1	process CC1_SPEC as a spec.
  %2	process CC1PLUS_SPEC as a spec.
+ %3     process LINK_GCC_C_SEQUENCE_SPEC as a spec.
  %|	output "-" if the input for the current command is coming from a pipe.
  %*	substitute the variable part of a matched option.  (See below.)
 	Note that each comma in the substituted string is replaced by
@@ -609,6 +610,13 @@ proper position among the other output files.  */
 
 /* Here is the spec for running the linker, after compiling all files.  */
 
+/* This is overridable by the target in case they need to specify the
+   -lgcc and -lc order specially, yet not require them to override all
+   of LINK_COMMAND_SPEC.  */
+#ifndef LINK_GCC_C_SEQUENCE_SPEC
+#define LINK_GCC_C_SEQUENCE_SPEC "%G %L %G"
+#endif
+
 /* -u* was put back because both BSD and SysV seem to support it.  */
 /* %{static:} simply prevents an error message if the target machine
    doesn't handle -static.  */
@@ -620,7 +628,7 @@ proper position among the other output files.  */
 %{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
     %(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r} %{s} %{t}\
     %{u*} %{x} %{z} %{Z} %{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
-    %{static:} %{L*} %(link_libgcc) %o %{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
+    %{static:} %{L*} %(link_libgcc) %o %{!nostdlib:%{!nodefaultlibs:%3}}\
     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} }}}}}}"
 #endif
 
@@ -639,6 +647,7 @@ static const char *cpp_spec = CPP_SPEC;
 static const char *cpp_predefines = CPP_PREDEFINES;
 static const char *cc1_spec = CC1_SPEC;
 static const char *cc1plus_spec = CC1PLUS_SPEC;
+static const char *link_gcc_c_sequence_spec = LINK_GCC_C_SEQUENCE_SPEC;
 static const char *asm_spec = ASM_SPEC;
 static const char *asm_final_spec = ASM_FINAL_SPEC;
 static const char *link_spec = LINK_SPEC;
@@ -1364,6 +1373,7 @@ static struct spec_list static_specs[] =
   INIT_STATIC_SPEC ("cc1",			&cc1_spec),
   INIT_STATIC_SPEC ("cc1_options",		&cc1_options),
   INIT_STATIC_SPEC ("cc1plus",			&cc1plus_spec),
+  INIT_STATIC_SPEC ("link_gcc_c_sequence",	&link_gcc_c_sequence_spec),
   INIT_STATIC_SPEC ("endfile",			&endfile_spec),
   INIT_STATIC_SPEC ("link",			&link_spec),
   INIT_STATIC_SPEC ("lib",			&lib_spec),
@@ -4749,6 +4759,12 @@ do_spec_1 (spec, inswitch, soft_matched_part)
 	      return value;
 	    break;
 
+	  case '3':
+	    value = do_spec_1 (link_gcc_c_sequence_spec, 0, NULL);
+	    if (value != 0)
+	      return value;
+	    break;
+
 	  case 'a':
 	    value = do_spec_1 (asm_spec, 0, NULL);
 	    if (value != 0)