install.texi: Explain AIX exception handling work-around.

* doc/install.texi: Explain AIX exception handling work-around.
        Update URL for AIX fixes.

From-SVN: r45486
This commit is contained in:
David Edelsohn 2001-09-08 06:24:00 +00:00 committed by David Edelsohn
parent 4e2c1c4484
commit d5d8d540f9
2 changed files with 20 additions and 6 deletions

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@ -3,6 +3,9 @@
* rs6000.c (num_insns_constant): Compute number of instructions
more accurately.
* doc/install.texi: Explain AIX exception handling work-around.
Update URL for AIX fixes.
2001-09-07 Jim Wilson <wilson@redhat.com>
* alias.c (clear_reg_alias_info): New.

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@ -2228,6 +2228,17 @@ and function declarations in the original program. The warnings should
not prevent the linker from producing a correct library or runnable
executable.
GCC's exception handling implementation stores process-specific data in
the shared library which prevents exception handling from working
correctly on AIX in a default installation. To work around this, the
shared objects need to be loaded in the process private segment to
prevent them from being shared and marked read-only. This is
accomplished on AIX by installing the shared libraries
(@file{libgcc_s.a} and @file{libstdc++.a}) with file permissions
disallowing read-other (@samp{chmod a+x,o-r}). If the shared libraries
have been used, the shared library segment can be cleaned using the
@samp{/usr/sbin/slibclean} command.
AIX 4.3 utilizes a ``large format'' archive to support both 32-bit and
64-bit object modules. The routines provided in AIX 4.3.0 and AIX 4.3.1
to parse archive libraries did not handle the new format correctly.
@ -2236,26 +2247,26 @@ linking such as ``not a COFF file''. The version of the routines shipped
with AIX 4.3.1 should work for a 32-bit environment. The @option{-g}
option of the archive command may be used to create archives of 32-bit
objects using the original ``small format''. A correct version of the
routines is shipped with AIX 4.3.2.
routines is shipped with AIX 4.3.2 and above.
Some versions of the AIX binder (linker) can fail with a relocation
overflow severe error when the @option{-bbigtoc} option is used to link
GCC-produced object files into an executable that overflows the TOC@. A fix
for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
available from IBM Customer Support and from its
@uref{http://service.boulder.ibm.com/,,service.boulder.ibm.com}
@uref{http://techsupport.services.ibm.com/,,techsupport.services.ibm.com}
website as PTF U455193.
The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core
with a segmentation fault when invoked by any version of GCC@. A fix for
APAR IX87327 is available from IBM Customer Support and from its
@uref{http://service.boulder.ibm.com/,,service.boulder.ibm.com}
@uref{http://techsupport.services.ibm.com/,,techsupport.services.ibm.com}
website as PTF U461879. This fix is incorporated in AIX 4.3.3 and above.
The initial assembler shipped with AIX 4.3.0 generates incorrect object
files. A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS
TO ASSEMBLE/BIND) is available from IBM Customer Support and from its
@uref{http://service.boulder.ibm.com/,,service.boulder.ibm.com}
@uref{http://techsupport.services.ibm.com/,,techsupport.services.ibm.com}
website as PTF U453956. This fix is incorporated in AIX 4.3.1 and above.
AIX provides National Language Support (NLS)@. Compilers and assemblers
@ -2269,8 +2280,8 @@ environment variable to @samp{C} or @samp{En_US}.
By default, GCC for AIX 4.1 and above produces code that can be used on
both Power or PowerPC processors.
You can specify a default version for the @option{-mcpu=@var{cpu_type}}
switch by using the configure option @option{--with-cpu-@var{cpu_type}}.
A default can be specified with the @option{-mcpu=@var{cpu_type}}
switch and using the configure option @option{--with-cpu-@var{cpu_type}}.
@html
</p>