[RFC] PR libfortran/34669

[Steven Bosscher]

Hi,

For this bug report, the problem is that gfortran sends the output of
-fdump-parse-tree to the assembler when compiling with -pipe.  In the
case of the bug report, this breaks mk-kinds-h.sh and other
libgfortran configuration scripts.

The bottom line is that -pipe and -fdump-parse-tree are just not
compatible at the moment.  We can accept that (no user should use
-fdump-parse-tree anyway) and work around the incompatibility in the
libgfortran scripts.  Or we can "fix" the compiler to not stream the
-fdump-parse-tree output to stdout, so it isn't piped to the assembler
with -pipe.

I have attached two patches as proposed solutions for the bug report.
The patch for the front end to send -fdump-parse-tree output to stderr
probably breaks the libgfortran shell scripts even without -pipe,
because the scripts expect the output in stdout.  I only just realized
this while typing this email ;-)

Anyway, you get the idea.  Which one is your preferred approach?

Gr.
Steven
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