Duplicate OPT_ entries in gcc/options.h

[Dimitry Andric]

On 08 Jun 2016, at 21:11, Gerald Pfeifer <gerald at pfeifer.com> wrote:
> 
> I got a user report, and could reproduce this, that building
> GCC (lang/gcc, but also current HEAD, so probably pretty much
> any version) with FreeBSD 11 and LANG = en_US.UTF-8 we get
> conflicting entires in $BUILDDIR/gcc/options.h such as
> 
>  OPT_d = 135,                               /* -d */
>  OPT_D = 136,                               /* -D */
>  OPT_d = 137,                               /* -d */
>  OPT_D = 138,                               /* -D */
>  OPT_d = 141,                               /* -d */
>  OPT_D = 142,                               /* -D */
>  OPT_d = 143,                               /* -d */
> 
> Using LANG = en_US (without UTF-8), everything works fine.
> 
> Any ideas what might be going on here?  (This is done via
> AWK scripts from what I can tell, does this trigger any
> ideas?)

It is definitely something caused by our awk in base, in any case.
First opt-gather.awk is run to generate a flat list of all options:

  /usr/bin/awk -f /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/opt-gather.awk /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/ada/gcc-interface/lang.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/fortran/lang.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/go/lang.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/java/lang.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/lto/lang.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/c-family/c.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/common.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/config/fused-madd.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/config/i386/i386.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/config/rpath.opt /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/config/freebsd.opt > tmp-optionlist

Then opt-functions.awk is run to process optionlist into options.h:

  /usr/bin/awk -f /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/opt-functions.awk -f /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/opt-read.awk -f /usr/ports/lang/gcc/work/gcc-4.8.5/gcc/opth-gen.awk < optionlist > options.h

If I run the first step using LANG=C, or without any LANG setting, both
optionlist and options.h are as expected.  If I run the first step using
LANG=en_US.UTF-8, the optionlist is sorted differently, for example the
"good" optionlist has the uppercase d options first, and much later the
lowercase d options:

  D^\C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)^\-D<macro>[=<val>]   Define a <macro> with <val> as its value.  If just <macro> is given, <val> is taken to be 1
  D^\Driver Joined Separate
  D^\Fortran Joined Separate
  ... much later in the file, after all options starting with an uppercase letter ...
  d^\C ObjC C++ ObjC++ Joined
  d^\Common Joined^\-d<letters>   Enable dumps from specific passes of the compiler
  d^\Fortran Joined
  d^\Java Separate SeparateAlias Alias(foutput-class-dir=)

The "bad" optionlist has the upper and lower case d options sorted
together:

  d^\C ObjC C++ ObjC++ Joined
  D^\C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)^\-D<macro>[=<val>]   Define a <macro> with <val> as its value.  If just <macro> is given, <val> is taken to be 1
  d^\Common Joined^\-d<letters>   Enable dumps from specific passes of the compiler
  D^\Driver Joined Separate
  defsym=^\Driver JoinedOrMissing
  defsym^\Driver Separate
  d^\Fortran Joined
  D^\Fortran Joined Separate
  d^\Java Separate SeparateAlias Alias(foutput-class-dir=)

Note that GNU awk does *not* produce a different optionlist file when
used with either LANG=C or LANG=en_US.UTF-8.

opt-gather.awk's sorting function looks like this:

  function sort(ARRAY, ELEMENTS)
  {
          for (i = 2; i <= ELEMENTS; ++i) {
                  for (j = i; ARRAY[j-1] > ARRAY[j]; --j) {
                          temp = ARRAY[j]
                          ARRAY[j] = ARRAY[j-1]
                          ARRAY[j-1] = temp
                  }
          }
          return
  }

So I am assuming that the ARRAY[j-1] > ARRAY[j] comparison works
differently in our awk, depending on the LANG settings.  No idea when
that changed, though, if it changed at all...

-Dimitry

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