Patchwork -grecord-gcc-switches (PR other/32998, take 3)

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Submitter Jakub Jelinek
Date July 22, 2011, 1:48 p.m.
Message ID <20110722134847.GE2687@tyan-ft48-01.lab.bos.redhat.com>
Download mbox | patch
Permalink /patch/106294/
State New
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Comments

Jakub Jelinek - July 22, 2011, 1:48 p.m.
On Fri, Jul 22, 2011 at 01:31:20PM +0000, Joseph S. Myers wrote:
> > Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
> 
> I don't see a change to invoke.texi to document the new options, but 

Oops, fixed below, tested with make doc.

> otherwise it looks OK in option handling terms.

Thanks.  Jason, is this ok for you too?

2011-07-22  Jakub Jelinek  <jakub@redhat.com>

	PR other/32998
	* common.opt (grecord-gcc-switches, gno-record-gcc-switches): New
	options.
	* dwarf2out.c: Include opts.h.
	(dchar_p): New typedef.  Define heap VEC for it.
	(producer_string): New variable.
	(gen_producer_string): New function.
	(gen_compile_unit_die): Use it.
	(dwarf2out_finish): Fix up comp_unit_die () DW_AT_producer
	if needed.
	* Makefile.in (dwarf2out.o): Depend on $(OPTS_H).
	* doc/invoke.texi: Document -grecord-gcc-switches and
	-gno-record-gcc-switches, add a -grecord-gcc-switches reference
	to -frecord-gcc-switches description.



	Jakub
Jason Merrill - July 22, 2011, 7:55 p.m.
On 07/22/2011 09:48 AM, Jakub Jelinek wrote:
> Thanks.  Jason, is this ok for you too?

Yes.

Jason

Patch

--- gcc/common.opt.jj	2011-07-13 17:31:09.000000000 +0200
+++ gcc/common.opt	2011-07-14 10:36:40.000000000 +0200
@@ -2184,6 +2184,14 @@  ggdb
 Common JoinedOrMissing
 Generate debug information in default extended format
 
+gno-record-gcc-switches
+Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(0)
+Don't record gcc command line switches in DWARF DW_AT_producer.
+
+grecord-gcc-switches
+Common RejectNegative Var(dwarf_record_gcc_switches,1)
+Record gcc command line switches in DWARF DW_AT_producer.
+
 gstabs
 Common JoinedOrMissing Negative(gstabs+)
 Generate debug information in STABS format
--- gcc/dwarf2out.c.jj	2011-07-22 09:18:49.000000000 +0200
+++ gcc/dwarf2out.c	2011-07-22 09:30:40.000000000 +0200
@@ -94,6 +94,7 @@  along with GCC; see the file COPYING3.  
 #include "tree-pass.h"
 #include "tree-flow.h"
 #include "cfglayout.h"
+#include "opts.h"
 
 static void dwarf2out_source_line (unsigned int, const char *, int, bool);
 static rtx last_var_location_insn;
@@ -18116,13 +18117,123 @@  gen_ptr_to_mbr_type_die (tree type, dw_d
   add_type_attribute (ptr_die, TREE_TYPE (type), 0, 0, context_die);
 }
 
+typedef const char *dchar_p; /* For DEF_VEC_P.  */
+DEF_VEC_P(dchar_p);
+DEF_VEC_ALLOC_P(dchar_p,heap);
+
+static char *producer_string;
+
+/* Return a heap allocated producer string including command line options
+   if -grecord-gcc-switches.  */
+
+static char *
+gen_producer_string (void)
+{
+  size_t j;
+  VEC(dchar_p, heap) *switches = NULL;
+  const char *language_string = lang_hooks.name;
+  char *producer, *tail;
+  const char *p;
+  size_t len = dwarf_record_gcc_switches ? 0 : 3;
+  size_t plen = strlen (language_string) + 1 + strlen (version_string);
+
+  for (j = 1; dwarf_record_gcc_switches && j < save_decoded_options_count; j++)
+    switch (save_decoded_options[j].opt_index)
+      {
+      case OPT_o:
+      case OPT_d:
+      case OPT_dumpbase:
+      case OPT_dumpdir:
+      case OPT_auxbase:
+      case OPT_auxbase_strip:
+      case OPT_quiet:
+      case OPT_version:
+      case OPT_v:
+      case OPT_w:
+      case OPT_L:
+      case OPT_D:
+      case OPT_I:
+      case OPT_U:
+      case OPT_SPECIAL_unknown:
+      case OPT_SPECIAL_ignore:
+      case OPT_SPECIAL_program_name:
+      case OPT_SPECIAL_input_file:
+      case OPT_grecord_gcc_switches:
+      case OPT_gno_record_gcc_switches:
+      case OPT__output_pch_:
+      case OPT_fdiagnostics_show_location_:
+      case OPT_fdiagnostics_show_option:
+      case OPT____:
+      case OPT__sysroot_:
+      case OPT_nostdinc:
+      case OPT_nostdinc__:
+	/* Ignore these.  */
+	continue;
+      default:
+        gcc_checking_assert (save_decoded_options[j].canonical_option[0][0]
+			     == '-');
+        switch (save_decoded_options[j].canonical_option[0][1])
+	  {
+	  case 'M':
+	  case 'i':
+	  case 'W':
+	    continue;
+	  case 'f':
+	    if (strncmp (save_decoded_options[j].canonical_option[0] + 2,
+			 "dump", 4) == 0)
+	      continue;
+	    break;
+	  default:
+	    break;
+	  }
+	VEC_safe_push (dchar_p, heap, switches,
+		       save_decoded_options[j].orig_option_with_args_text);
+	len += strlen (save_decoded_options[j].orig_option_with_args_text) + 1;
+	break;
+      }
+
+  producer = XNEWVEC (char, plen + 1 + len + 1);
+  tail = producer;
+  sprintf (tail, "%s %s", language_string, version_string);
+  tail += plen;
+
+  if (!dwarf_record_gcc_switches)
+    {
+#ifdef MIPS_DEBUGGING_INFO
+      /* The MIPS/SGI compilers place the 'cc' command line options in the
+	 producer string.  The SGI debugger looks for -g, -g1, -g2, or -g3;
+	 if they do not appear in the producer string, the debugger reaches
+	 the conclusion that the object file is stripped and has no debugging
+	 information.  To get the MIPS/SGI debugger to believe that there is
+	 debugging information in the object file, we add a -g to the producer
+	 string.  */
+      if (debug_info_level > DINFO_LEVEL_TERSE)
+	{
+	  memcpy (tail, " -g", 3);
+	  tail += 3;
+	}
+#endif
+    }
+
+  FOR_EACH_VEC_ELT (dchar_p, switches, j, p)
+    {
+      len = strlen (p);
+      *tail = ' ';
+      memcpy (tail + 1, p, len);
+      tail += len + 1;
+    }
+
+  *tail = '\0';
+  VEC_free (dchar_p, heap, switches);
+  return producer;
+}
+
 /* Generate the DIE for the compilation unit.  */
 
 static dw_die_ref
 gen_compile_unit_die (const char *filename)
 {
   dw_die_ref die;
-  char producer[250];
   const char *language_string = lang_hooks.name;
   int language;
 
@@ -18136,20 +18247,9 @@  gen_compile_unit_die (const char *filena
 	add_comp_dir_attribute (die);
     }
 
-  sprintf (producer, "%s %s", language_string, version_string);
-
-#ifdef MIPS_DEBUGGING_INFO
-  /* The MIPS/SGI compilers place the 'cc' command line options in the producer
-     string.  The SGI debugger looks for -g, -g1, -g2, or -g3; if they do
-     not appear in the producer string, the debugger reaches the conclusion
-     that the object file is stripped and has no debugging information.
-     To get the MIPS/SGI debugger to believe that there is debugging
-     information in the object file, we add a -g to the producer string.  */
-  if (debug_info_level > DINFO_LEVEL_TERSE)
-    strcat (producer, " -g");
-#endif
-
-  add_AT_string (die, DW_AT_producer, producer);
+  if (producer_string == NULL)
+    producer_string = gen_producer_string ();
+  add_AT_string (die, DW_AT_producer, producer_string);
 
   /* If our producer is LTO try to figure out a common language to use
      from the global list of translation units.  */
@@ -22123,6 +22223,15 @@  dwarf2out_finish (const char *filename)
   htab_t comdat_type_table;
   unsigned int i;
 
+  /* PCH might result in DW_AT_producer string being restored from the
+     header compilation, fix it up if needed.  */
+  dw_attr_ref producer = get_AT (comp_unit_die (), DW_AT_producer);
+  if (strcmp (AT_string (producer), producer_string) != 0)
+    {
+      struct indirect_string_node *node = find_AT_string (producer_string);
+      producer->dw_attr_val.v.val_str = node;
+    }
+
   gen_scheduled_generic_parms_dies ();
   gen_remaining_tmpl_value_param_die_attribute ();
 
--- gcc/Makefile.in.jj	2011-07-13 17:31:18.000000000 +0200
+++ gcc/Makefile.in	2011-07-14 10:36:40.000000000 +0200
@@ -2953,7 +2953,7 @@  dwarf2out.o : dwarf2out.c $(CONFIG_H) $(
    $(GGC_H) $(EXCEPT_H) dwarf2asm.h $(TM_P_H) langhooks.h $(HASHTAB_H) \
    gt-dwarf2out.h $(TARGET_H) $(CGRAPH_H) $(MD5_H) $(INPUT_H) $(FUNCTION_H) \
    $(GIMPLE_H) $(TREE_PASS_H) $(TREE_FLOW_H) $(CFGLAYOUT_H) \
-   tree-pretty-print.h $(COMMON_TARGET_H)
+   tree-pretty-print.h $(COMMON_TARGET_H) $(OPTS_H)
 dwarf2cfi.o : dwarf2cfi.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
    version.h $(RTL_H) $(FUNCTION_H) $(DWARF2_H) dwarf2asm.h dwarf2out.h \
    $(GGC_H) $(TM_P_H) $(TARGET_H) $(TREE_PASS_H)
--- gcc/doc/invoke.texi.jj	2011-07-19 11:20:34.000000000 +0200
+++ gcc/doc/invoke.texi	2011-07-22 15:42:31.573545950 +0200
@@ -11,7 +11,7 @@ 
 
 @c man begin COPYRIGHT
 Copyright @copyright{} 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
@@ -328,7 +328,8 @@  Objective-C and Objective-C++ Dialects}.
 -fstack-usage  -ftest-coverage  -ftime-report -fvar-tracking @gol
 -fvar-tracking-assignments  -fvar-tracking-assignments-toggle @gol
 -g  -g@var{level}  -gtoggle  -gcoff  -gdwarf-@var{version} @gol
--ggdb  -gstabs  -gstabs+  -gstrict-dwarf  -gno-strict-dwarf @gol
+-ggdb  -grecord-gcc-switches  -gno-record-gcc-switches @gol
+-gstabs  -gstabs+  -gstrict-dwarf  -gno-strict-dwarf @gol
 -gvms  -gxcoff  -gxcoff+ @gol
 -fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
 -fdebug-prefix-map=@var{old}=@var{new} @gol
@@ -4687,6 +4688,20 @@  use, some non-conflicting DWARF 3 extens
 Version 4 may require GDB 7.0 and @option{-fvar-tracking-assignments}
 for maximum benefit.
 
+@item -grecord-gcc-switches
+@opindex grecord-gcc-switches
+This switch causes the command line options, that were used to invoke the
+compiler and may affect code generation, to be appended to the
+DW_AT_producer attribute in DWARF debugging information.  The options
+are concatenated with spaces separating them from each other and from
+the compiler version.  See also @option{-frecord-gcc-switches} for another
+way of storing compiler options into the object file.
+
+@item -gno-record-gcc-switches
+@opindex gno-record-gcc-switches
+Disallow appending command line options to the DW_AT_producer attribute
+in DWARF debugging information.  This is the default.
+
 @item -gstrict-dwarf
 @opindex gstrict-dwarf
 Disallow using extensions of later DWARF standard version than selected
@@ -18029,6 +18044,8 @@  usually takes the form of a section cont
 switch is related to the @option{-fverbose-asm} switch, but that
 switch only records information in the assembler output file as
 comments, so it never reaches the object file.
+See also @option{-grecord-gcc-switches} for another
+way of storing compiler options into the object file.
 
 @item -fpic
 @opindex fpic