On Tue, Mar 29, 2011 at 12:20:32PM +0200, Mark Wielaard wrote:
> Some dwarf consumers (dwarves, systemtap and dwarflint) grok Dwarf V4,
> but not yet the new .debug_types section. To make it easier to use these
> tools with -gdwarf-4 this patch introduces a new
> -fno-debug-types-section flag and guards all code that is type unit
> specific with use_debug_types instead of a generic dwarf_version >= 4
> flag. IMHO this makes the code also slightly more readable. And it
> re-enables the usage of -feliminate-dwarf2-dups with -gdwarf-4. Although
> admittedly the value of that is probably pretty low. I found it helpful
> in debugging some issues with dwarf consumers and DW_FORM_ref_addr
> usage.
While backporting your patch I've noticed a couple of minor issues.
1) common.opt is supposed to be ASCII sorted (clearly many options violate
that, but most of the file is actually sorted)
2) there was a missing @gol
3) there is no -f{,no-}-types-section switch
4) DWARF is spelled in capital letters everywhere else in doc/invoke.texi
Committed as obvious to trunk.
2011-03-31 Jakub Jelinek <ja...@redhat.com>
* common.opt (fdebug-types-section): Move earlier.
* doc/invoke.texi: Fix up -fno-debug-types-section documentation.
--- gcc/common.opt (revision 171771)
+++ gcc/common.opt (working copy)
@@ -918,6 +918,10 @@ fdebug-prefix-map=
Common Joined RejectNegative Var(common_deferred_options) Defer
Map one directory name to another in debug information
+fdebug-types-section
+Common Report Var(flag_debug_types_section) Init(1)
+Output .debug_types section when using DWARF v4 debuginfo.
+
; Nonzero for -fdefer-pop: don't pop args after each function call
; instead save them up to pop many calls' args with one insns.
fdefer-pop
@@ -1012,10 +1016,6 @@ femit-class-debug-always
Common Report Var(flag_emit_class_debug_always) Init(0)
Do not suppress C++ class debug information.
-fdebug-types-section
-Common Report Var(flag_debug_types_section) Init(1)
-Output .debug_types section when using DWARF v4 debuginfo.
-
fexceptions
Common Report Var(flag_exceptions) Optimization
Enable exception handling
--- gcc/doc/invoke.texi (revision 171771)
+++ gcc/doc/invoke.texi (working copy)
@@ -312,7 +312,7 @@ Objective-C and Objective-C++ Dialects}.
-fdump-final-insns=@var{file} @gol
-fcompare-debug@r{[}=@var{opts}@r{]} -fcompare-debug-second @gol
-feliminate-dwarf2-dups -feliminate-unused-debug-types @gol
--feliminate-unused-debug-symbols -femit-class-debug-always
+-feliminate-unused-debug-symbols -femit-class-debug-always @gol
-fdebug-types-section @gol
-fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report -fprofile-arcs @gol
-frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
@@ -4587,13 +4587,13 @@ option will increase the size of debuggi
factor of two.
@item -fno-debug-types-section
-@opindex fno-types-section
-@opindex ftypes-section
-By default when using Dwarf v4 or higher type DIEs will be put into
+@opindex fno-debug-types-section
+@opindex fdebug-types-section
+By default when using DWARF v4 or higher type DIEs will be put into
their own .debug_types section instead of making them part of the
.debug_info section. It is more efficient to put them in a separate
comdat sections since the linker will then be able to remove duplicates.
-But not all dwarf consumers support .debug_types sections yet.
+But not all DWARF consumers support .debug_types sections yet.
@item -gstabs+
@opindex gstabs+
Jakub
