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Installing GNU CC on the MIPS
See Note: Installation about whether to use either of the options
`--with-stabs' or `--with-gnu-as'.
The MIPS C compiler needs to be told to increase its table size for
switch statements with the `-Wf,-XNg1500' option in order to compile
`cp-parse.c'. If you use the `-O2' optimization option, you also need
to use `-Olimit 3000'. Both of these options are automatically
generated in the `Makefile' that the shell script `configure' builds.
If you override the `CC' make variable and use the MIPS compilers, you
may need to add `-Wf,-XNg1500 -Olimit 3000'.
MIPS computers running RISC-OS can support four different
personalities: default, BSD 4.3, System V.3, and System V.4 (older
versions of RISC-OS don't support V.4). To configure GCC for these
platforms use the following configurations:
Default configuration for RISC-OS, revision `rev'.
BSD 4.3 configuration for RISC-OS, revision `rev'.
System V.4 configuration for RISC-OS, revision `rev'.
System V.3 configuration for RISC-OS, revision `rev'.
The revision `rev' mentioned above is the revision of RISC-OS to
use. You must reconfigure GCC when going from a RISC-OS revision 4 to
RISC-OS revision 5. This has the effect of avoiding a linker bug (see
Note: Installation Problems for more details).
DECstations can support three different personalities: Ultrix, DEC
OSF/1, and OSF/rose. To configure GCC for these platforms use the
Dec's version of OSF/1.
Open Software Foundation reference port of OSF/1 which uses the
OSF/rose object file format instead of ECOFF. Normally, you would
not select this configuration.
On Irix version 4.0.5F, and perhaps on some other versions as well,
there is an assembler bug that reorders instructions incorrectly. To
work around it, specify the target configuration `mips-sgi-irix4loser'.
This configuration inhibits assembler optimization.
You can turn off assembler optimization in a compiler configured with
target `mips-sgi-irix4' using the `-noasmopt' option. This compiler
option passes the option `-O0' to the assembler, to inhibit reordering.
The `-noasmopt' option can be useful for testing whether a problem
is due to erroneous assembler reordering. Even if a problem does not go
away with `-noasmopt', it may still be due to assembler
reordering--perhaps GNU CC itself was miscompiled as a result.
We know this is inconvenient, but it's the best that can be done at
the last minute.
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