[CPP patch]: -M default name

[Nathan Sidwell]

Neil Booth wrote:

> OK, I think this fixes the empty file problem.  Nathan, are you OK
> with the basename stuff?
Here's the basename stuff, built and tested on i686-pc-linux-gnu, ok?

nathan
-- 
Dr Nathan Sidwell   ::   http://www.codesourcery.com   ::   CodeSourcery LLC
         'But that's a lie.' - 'Yes it is. What's your point?'
nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org
2001-02-08  Nathan Sidwell  <nathan@codesourcery.com>

	* mkdeps.c (deps_add_default_target): Robustify. Add
	basename component only.
	* cpp.texi (-M): Describe how default target is generated.
	* invoke.texi (-M): Likewise.

Index: mkdeps.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/mkdeps.c,v
retrieving revision 1.11
diff -c -3 -p -r1.11 mkdeps.c
*** mkdeps.c	2001/01/06 11:08:49	1.11
--- mkdeps.c	2001/02/08 15:17:23
*************** deps_add_default_target (d, tgt)
*** 180,187 ****
       struct deps *d;
       const char *tgt;
  {
-   char *o, *suffix;
- 
    /* Only if we have no targets.  */
    if (d->ntargets)
      return;
--- 180,185 ----
*************** deps_add_default_target (d, tgt)
*** 190,208 ****
      deps_add_target (d, "-", 1);
    else
      {
-       o = (char *) alloca (strlen (tgt) + 8);
- 
-       strcpy (o, tgt);
-       suffix = strrchr (o, '.');
- 
  #ifndef OBJECT_SUFFIX
  # define OBJECT_SUFFIX ".o"
  #endif
  
!       if (suffix)
! 	strcpy (suffix, OBJECT_SUFFIX);
!       else
! 	strcat (o, OBJECT_SUFFIX);
        deps_add_target (d, o, 1);
      }
  }
--- 188,207 ----
      deps_add_target (d, "-", 1);
    else
      {
  #ifndef OBJECT_SUFFIX
  # define OBJECT_SUFFIX ".o"
  #endif
+       char *start = basename (tgt);
+       char *o = (char *) alloca (strlen (start) + strlen (OBJECT_SUFFIX) + 1);
+       char *suffix;
  
!       strcpy (o, start);
!       
!       suffix = strrchr (o, '.');
!       if (!suffix)
!         suffix = o + strlen (o);
!       strcpy (suffix, OBJECT_SUFFIX);
!       
        deps_add_target (d, o, 1);
      }
  }
Index: cpp.texi
===================================================================
RCS file: /cvs/gcc/egcs/gcc/cpp.texi,v
retrieving revision 1.45
diff -c -3 -p -r1.45 cpp.texi
*** cpp.texi	2001/02/02 19:39:46	1.45
--- cpp.texi	2001/02/08 15:17:30
*************** suitable for @code{make} describing the 
*** 3487,3493 ****
  file.  The preprocessor outputs one @code{make} rule containing the
  object file name for that source file, a colon, and the names of all the
  included files, including those coming from @samp{-include} or
! @samp{-imacros} command line options.  If there are many included files
  then the rule is split into several lines using @samp{\}-newline.
  
  @item -MM
--- 3487,3496 ----
  file.  The preprocessor outputs one @code{make} rule containing the
  object file name for that source file, a colon, and the names of all the
  included files, including those coming from @samp{-include} or
! @samp{-imacros} command line options.  Unless specified explicitly (with
! @samp{-MT} or @samp{-MQ}), the object file name consists of the basename
! of the source file with any suffix replaced with object file suffix.
! If there are many included files
  then the rule is split into several lines using @samp{\}-newline.
  
  @item -MM
Index: invoke.texi
===================================================================
RCS file: /cvs/gcc/egcs/gcc/invoke.texi,v
retrieving revision 1.273
diff -c -3 -p -r1.273 invoke.texi
*** invoke.texi	2001/02/05 11:45:13	1.273
--- invoke.texi	2001/02/08 15:17:50
*************** Instead of outputting the result of prep
*** 3364,3371 ****
  suitable for @code{make} describing the dependencies of the main source
  file.  The preprocessor outputs one @code{make} rule containing the
  object file name for that source file, a colon, and the names of all the
! included files.  If there are many included files then the rule is split
! into several lines using @samp{\}-newline.
  
  @samp{-M} implies @samp{-E}.
  
--- 3364,3373 ----
  suitable for @code{make} describing the dependencies of the main source
  file.  The preprocessor outputs one @code{make} rule containing the
  object file name for that source file, a colon, and the names of all the
! included files.  Unless overridden explicitly, the object file name
! consists of the basename of the source file with any suffix replaced with
! object file suffix. If there are many included files then the
! rule is split into several lines using @samp{\}-newline.
  
  @samp{-M} implies @samp{-E}.