On 20 August 2012 16:45, Joseph S. Myers <jos...@codesourcery.com> wrote: > > On Mon, 20 Aug 2012, Simon Baldwin wrote: > > > > OPT_* for Fortran options only exist when the Fortran front-end is in the > > > source tree (whether or not enabled). I think we try to avoid knowingly > > > breaking use cases where people remove some front ends from the source > > > tree, although we don't actively test them and no longer provide split-up > > > source tarballs. > > > > Thanks for the update. Which fix should move forwards? > > I think the approach using a new option flag is the way to go, though the > patch needs (at least) documentation for the new flag in options.texi. >
Updated version appended below. Okay for 4.8 trunk? ---------- Omit OPT_cpp_ from the DWARF producer string in gfortran. Gfortran uses -cpp=<temporary file> internally, and with -grecord_gcc_switches this command line switch is stored by default in object files. This causes problems with build and packaging systems that care about gcc binary reproducibility and file checksums; the temporary file is different on each compiler invocation. Fixed by adding a new opt marker NoDWARFRecord and associated flag, filtering options for this this setting when writing the producer string, and setting this flag for fortran -cpp=<temporary file> Tested for fortran (suppresses -cpp=...) and c (no effect). gcc/ChangeLog 2012-08-21 Simon Baldwin <sim...@google.com> * dwarf2out.c (gen_producer_string): Omit command line switch if CL_NO_DWARF_RECORD flag set. * opts.c (print_specific_help): Add CL_NO_DWARF_RECORD handling. * opts.h (CL_NO_DWARF_RECORD): New. * opt-functions.awk (switch_flags): Add NoDWARFRecord. * doc/options.texi: Document NoDWARFRecord option flag. * doc/invoke.texi: Document --help=nodwarfrecord. gcc/fortran/ChangeLog 2012-08-21 Simon Baldwin <sim...@google.com> * lang.opt (-cpp=): Mark flag NoDWARFRecord. Index: gcc/doc/options.texi =================================================================== --- gcc/doc/options.texi (revision 190535) +++ gcc/doc/options.texi (working copy) @@ -468,4 +468,8 @@ of @option{-@var{opt}}, if not explicitl specify several different languages. Each @var{language} must have been declared by an earlier @code{Language} record. @xref{Option file format}. + +@item NoDWARFRecord +The option is added to the list of those omitted from the producer string +written by @option{-grecord-gcc-switches}. @end table Index: gcc/doc/invoke.texi =================================================================== --- gcc/doc/invoke.texi (revision 190535) +++ gcc/doc/invoke.texi (working copy) @@ -1330,6 +1330,10 @@ sign in the same continuous piece of tex @item @samp{separate} Display options taking an argument that appears as a separate word following the original option, such as: @samp{-o output-file}. + +@item @samp{nodwarfrecord} +Display only those options that are marked for addition to the list of +options omitted from @option{-grecord-gcc-switches}. @end table Thus for example to display all the undocumented target-specific Index: gcc/dwarf2out.c =================================================================== --- gcc/dwarf2out.c (revision 190535) +++ gcc/dwarf2out.c (working copy) @@ -18101,6 +18101,9 @@ gen_producer_string (void) /* Ignore these. */ continue; default: + if (cl_options[save_decoded_options[j].opt_index].flags + & CL_NO_DWARF_RECORD) + continue; gcc_checking_assert (save_decoded_options[j].canonical_option[0][0] == '-'); switch (save_decoded_options[j].canonical_option[0][1]) Index: gcc/opts.c =================================================================== --- gcc/opts.c (revision 190535) +++ gcc/opts.c (working copy) @@ -1186,7 +1186,9 @@ print_specific_help (unsigned int includ { if (any_flags == 0) { - if (include_flags & CL_UNDOCUMENTED) + if (include_flags & CL_NO_DWARF_RECORD) + description = _("The following options are not recorded by DWARF"); + else if (include_flags & CL_UNDOCUMENTED) description = _("The following options are not documented"); else if (include_flags & CL_SEPARATE) description = _("The following options take separate arguments"); @@ -1292,7 +1294,7 @@ common_handle_option (struct gcc_options /* Walk along the argument string, parsing each word in turn. The format is: arg = [^]{word}[,{arg}] - word = {optimizers|target|warnings|undocumented| + word = {optimizers|target|warnings|undocumented|nodwarfrecord| params|common|<language>} */ while (* a != 0) { @@ -1307,6 +1309,7 @@ common_handle_option (struct gcc_options { "target", CL_TARGET }, { "warnings", CL_WARNING }, { "undocumented", CL_UNDOCUMENTED }, + { "nodwarfrecord", CL_NO_DWARF_RECORD }, { "params", CL_PARAMS }, { "joined", CL_JOINED }, { "separate", CL_SEPARATE }, Index: gcc/opts.h =================================================================== --- gcc/opts.h (revision 190535) +++ gcc/opts.h (working copy) @@ -145,6 +145,7 @@ extern const unsigned int cl_lang_count; #define CL_JOINED (1U << 22) /* If takes joined argument. */ #define CL_SEPARATE (1U << 23) /* If takes a separate argument. */ #define CL_UNDOCUMENTED (1U << 24) /* Do not output with --help. */ +#define CL_NO_DWARF_RECORD (1U << 25) /* Do not add to producer string. */ /* Flags for an enumerated option argument. */ #define CL_ENUM_CANONICAL (1 << 0) /* Canonical for this value. */ Index: gcc/fortran/lang.opt =================================================================== --- gcc/fortran/lang.opt (revision 190535) +++ gcc/fortran/lang.opt (working copy) @@ -295,7 +295,7 @@ Fortran Negative(nocpp) Enable preprocessing cpp= -Fortran Joined Negative(nocpp) Undocumented +Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord ; Internal option generated by specs from -cpp. nocpp Index: gcc/opt-functions.awk =================================================================== --- gcc/opt-functions.awk (revision 190535) +++ gcc/opt-functions.awk (working copy) @@ -103,6 +103,7 @@ function switch_flags (flags) test_flag("JoinedOrMissing", flags, " | CL_JOINED") \ test_flag("Separate", flags, " | CL_SEPARATE") \ test_flag("Undocumented", flags, " | CL_UNDOCUMENTED") \ + test_flag("NoDWARFRecord", flags, " | CL_NO_DWARF_RECORD") \ test_flag("Warning", flags, " | CL_WARNING") \ test_flag("Optimization", flags, " | CL_OPTIMIZATION") sub( "^0 \\| ", "", result ) -- Google UK Limited | Registered Office: Belgrave House, 76 Buckingham Palace Road, London SW1W 9TQ | Registered in England Number: 3977902