Date: Mon, 29 Mar 1999 20:55:07 -0800 (PST) From: "David E. O'Brien" <obrien@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/contrib/egcs/gcc gcc.c Message-ID: <199903300455.UAA98204@freefall.freebsd.org>
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obrien 1999/03/29 20:55:07 PST
Modified files:
contrib/egcs/gcc gcc.c
Log:
Changes to support generation of assembler for the old a.out gas and the
binutils gas (elf or a.out) with a single compiler.
This uses other infrastructure in order to support both a.out and elf it
needs to be able to get to both a.out and elf gas, ld, libs, crt* etc.
The new freebsd.h file is based on the old freebsd-elf.h file (which has a
long lineage, right back through linux and svr4 files). The change is
pretty dramatic from a gcc internals standpoint as it overrides a lot of
definitions in order to generate different output based on target mode.
There is potential for screw-ups, so please be on the lookout - gcc's
configuration mechanism wasn't really meant for this kind of thing.
It's believed to compile world etc just fine under both a.out and elf, can
handle global constructors and destructors, handles the differences in
a.out and elf stabs, and what sections things like exceptions go in.
The initial idea came from i386/osfrose.h which is a dual rose/elf format
target. These two are not as diverse as a.out and elf it would seem.
The cc front-end uses external configuration to determine default object
format (still being thrashed out, so read the source if you want to see
it so far), and has a '-aout' and '-elf' override command line switch.
There are some other internal switches that can be accessed, namely -maout,
-mno-aout, -munderscores and -mnounderscores. The underscore and local
symbol prefixing rules are controllable seperately to the output format.
(ie: it's possible to generate a.out without the _ prefixes on symbols and
also to generate elf with the _ prefixes. This isn't quite optimal, but
does seem to work pretty well, except the linkers don't always recognise
the local symbols without their normal names)
Obtained from: rev 1.5 of contrib/gcc/gcc.c by peter (w/sos,jdp sitting in)
Revision Changes Path
1.3 +73 -1 src/contrib/egcs/gcc/gcc.c
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