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Update in preparation for the new release.

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README.IRIX-5:
	Update in preparation for the new release.
	Non-local gotos are not supported anymore.
This commit is contained in:
Fergus Henderson
2002-10-16 08:20:49 +00:00
parent b1c5fb300f
commit aa5f9b2751
1 changed files with 15 additions and 31 deletions
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README.IRIX-5
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We have not been able to test the Irix 5 port since March 2000,
due to lack of access to an Irix 5 machine.
On Irix 5, it is not possible to use both gcc's non-local gotos and
position-independent code (which is required for shared libraries)
The Mercury auto-configuration script will usually resolve this problem
by disabling the use of gcc's non-local gotos. That works fine, but
the resulting `reg.gc' grade compiler is considerably less efficient
that the `asm_fast.gc' grade compiler that uses non-local gotos.
It's about 30% larger (3.3M vs 2.5M stripped), and probably about
20-100% slower (at a very rough guess).
position-independent code (which is required for shared libraries).
The Mercury auto-configuration script should resolve this problem
by disabling the use of gcc's non-local gotos (e.g. the `asm_fast.gc'
grade).
To use non-local gotos, your Irix machine needs to have the nonshared
versions of the C standard library installed in /usr/lib/nonshared,
and you need also need a version of `libgcc.a' that has been compiled
with `-mno-abicalls' in /usr/lib/nonshared. To create that, you need
to obtain a copy of the gcc source distribution, replace the `-g1' with
`-mno-abicalls' in the definition of LIBGCC2_CFLAGS in the Makefile in
the gcc source directory, type `make libgcc.a', and then copy libgcc.a
to /usr/lib/nonshared. (To use a directory other than
/usr/lib/nonshared for libgcc.a, you must set the environment
variable MERCURY_NONSHARED_LIB_DIR to the appropriate directory before
running `configure'.)
Use of non-local gotos on Irix 5 was supported in previous releases of
Mercury, but now we recommend using the hlc.gc grade instead.
Once you have done that, you can reinstall Mercury;
`configure' should detect that using gcc labels now works.
(If it doesn't, examine config.log to work out what went wrong.)
`configure' will also disable shared libraries, so that
the installation process doesn't attempt to build shared
versions of the `asm_fast.gc' grade libraries (and others).
However, the linker will still pick up the shared libraries
for `reg.gc' and the other grades installed initially
(before creating a nonshared libgcc.a).
The default grade will be set to `reg.gc', since shared libraries
give you small executables and short link times. But for
large programs, you should set GRADE=asm_fast.gc in your Mmake file
for considerably improved performance.
If you install from the source distribution, the initial version of the
compiler will use grade reg.gc. You can get a faster compiler by
adding the directory for the installed mmc to your PATH and then
reinstalling from the source distribution. The second time around,
the configure script will detect that a working mmc is in your PATH
and will build the compiler in grade hlc.gc rather than grade reg.gc.