🚀 go-pugleaf

Date:       30 Dec 1992
Version:    2.3.3
Machine/OS: Acorn RISCiX

I am presently working actively on fixing gcc for RISCiX (UNIX for the ARM
processor).  Although included in the gcc distribution it is not yet
complete, but is almost there :-) .  I need to allow for 3 mutually exclusive
flags to be set, setting which 'compilation environment' the compiled program
has been designed to work with: BSD, XOPEN or strict ANSI conformance.  This
facility is allowed for in RISCiX, and is provided by the 'standard' RISCiX
compiler.

I have implemented these flags as -menv-BSD, -menv-XOPEN and -menv-strict.
These can be tested by the specs in gcc.c, to ensure that only one is given.
After 'as' has compiled an object, it is then post-processed to insert
debugging info into the object (the RISCiX assembler does not support stabs
directives) like the MIPS version.  Following this, a system-provided
utility, symrename, is called to rename any symbols according to whether
BSD, XOPEN or strict was set, as described above.

What I hoped to do was to implement the test for only one -menv option via
CPP_SPEC.  This is inserted into the specs by gcc at the point marked by %C.
However, when an error is generated (by %e) in specs included by %C, the
compilation continues.  This is not the case when the error is generated
in the specs themselves.  This is annoying, because I had hoped to avoid
having to rewrite the specs and put the RISCiX version in a big #ifdef
just because of a few extra bits! As it is, 90% of the specs are identical,
but are duplicated to avoid this problem.

An additional problem is that there is no spec which returns the file name
of the source sent to the assembler.  If an assembler  post-processor is used,
then the spec will not work both for normal compiles and compiles of .s files.
For normal compiles, the spec is %g.o.  However, if a .s file is 'compiled',
then %g.o invents a new temporary filename, rather than giving the equivalent
of %i (the source filename).

Finally, because the assembler post-processor needs to read the assembler
source file it cannot be piped into the assembler, but must be saved to a
temporary file first.  However, that does not mean that I want to stop pipes
being used to transfer stuff from cpp to cc1 etc.  There does not seem to be
a way of doing this without removing the '|' from the line before the call to
'as'.  However, this would mean having a special version of the specs for
RISCiX, which (although I have done it that way for the moment) is not really
desirable.

Michael Ben-Gershon
mybg@cs.huji.ac.il