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112 lines
5.0 KiB
Plaintext
112 lines
5.0 KiB
Plaintext
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AIX 3.1 and 3.2 assembler problems
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Specifying the -g flag to GCC on the RS/6000 requires upgrading the
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standard AIX assembler distributed with AIX 3.1 and versions of AIX
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3.2 earlier than 3.2.4 with a replacement that is available from IBM.
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Note that Makefile.in specifies the -g when compiling libgcc2.c.
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You can test for the presence of a fixed assembler by entering the following:
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% as -u < /dev/null
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If the command exits normally, the assembler fix already is installed.
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If the assembler complains that "-u" is an unknown flag, you need to order
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the fix.
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If you are running AIX 3.1 (lslpp -h bos.obj output reports
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03.01.0005.XXXX where the 0005 can be any higher number and the XXXX
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can be any value), call IBM Support at 800-237-5511 and ask for
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shipment of AIX/6000 fix PTF U403044 for APAR IX22829 (.extern foo
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conflicts with defining foo).
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If you are running AIX 3.2 but not 3.2.4 or later (lslpp -h bos.obj
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output reports 03.02.0000.0000), a newer update to the assembler fix
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is available. Ask for shipment of AIX/6000 fix PTF U416277 for
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IX32992 (.global prevents detection of duplicate symbol).
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If you are running AIX 3.2.4 or later, you already have the new
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assembler.
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Any customer can order and get the replacement assembler, and install it on
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one or more machines. It is available on diskette from IBM Customer Support
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and from the IBM Internet fix anonymous ftp server (FixDist) at
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aix.boulder.ibm.com (198.17.57.66).
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If you contact IBM Customer Support, they may also ask you for your customer
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number. If you do not know it, you will still be able to get the fix, but
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you will have to be persistent. IBM has corresponding support organizations
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outside of North America. Call your IBM branch office and ask them to put
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you in touch with the department that handles fixes for AIX/6000. If that
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doesn't work, ask for the department that handles software defect support
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for AIX/6000 and ask for the APAR fix.
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If you use the GNU assembler instead of the system supplied assembler, you need
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an assembler modified after October 16th, 1995 in order to build the GNU C
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compiler. This is because the GNU C compiler wants to build a variant of its
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library, libgcc.a with the -mcpu=common switch to support building programs
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that can run on either the Power or PowerPC machines.
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AIX NLS problems
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AIX on the RS/6000 provides support (NLS) for environments outside of
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the United States. Compilers and assemblers use NLS to support
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locale-specific representations of various objects including
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floating-point numbers ("." vs "," for separating decimal fractions).
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There have been problems reported where the library linked with GCC does
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not produce the same floating-point formats that the assembler accepts.
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If you have this problem, set the LANG environment variable to "C" or
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"En_US".
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AIX 3.2.5 XLC-1.3 problems
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XLC version 1.3.0.0 distributed with AIX 3.2.5 will miscompile jump.c when
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building the stage1 compiler during the bootstrap process. This will cause
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GCC to crash and the bootstrap to fail later while compiling libgcc2.c. XLC
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version 1.3.0.1 or later fixes this problem. XLC-1.3.0.19 also cannot
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bootstrap GCC so please avoid that release as well. You can obtain
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XLC-1.3.0.24 by requesting PTF 432238 from IBM, or just ask for the latest
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release of XLC-1.3.
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There also have been reports of problems bootstrapping GCC with some older
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releases of xlc-1.2.1, including xlc-1.2.1.8. Newer releases of xlc-1.2.1
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do not exhibit this problem: xlc-1.2.1.28 is known to bootstrap properly.
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AIX 3.2 common-mode support
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AIX common-mode providing transparent support of both the POWER and PowerPC
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architectures is usable in AIX 3.2.3 and above but an export file and
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support for hidden export via libc.a will not exist until AIX 4.1. libgcc.a
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also must be compiled in common-mode. Note that executables generated for
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the POWER (RIOS1 and RSC) architecture will run directly on systems using
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the MPC601 chip. Common-mode only improves the performance of a single
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executable run on both POWER and PowerPC architecture platforms by not using
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POWER- or PowerPC-specific instructions and eliminating the need to trap to
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emulation (for POWER instructions run on PowerPC).
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To link a common-mode application prior to AIX 4.1 and run it on a system at
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AIX level 3.2.3 or above, use the text between the "<>" as an export file
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(e.g. milli.exp)
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<><><><><><><><><><><>
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#!
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__mulh 0x3100
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__mull 0x3180
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__divss 0x3200
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__divus 0x3280
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__quoss 0x3300
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__quous 0x3380
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<><><><><><><><><><><>
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and then link with -Wl,-bI:milli.exp.
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AIX 4.1 binder
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Due to changes in the way that GCC invokes the binder (linker) for AIX 4.1,
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the link step now may produce warnings of duplicate symbols which were not
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reported before. The assembly files generated by GCC for AIX always have
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included multiple symbol definitions for certain global variable and
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function declarations in the original program. The warnings should not
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prevent the linker from producing a correct library or runnable executable.
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