AIX Version 4.3 Differences Guide

archive file format that provides for separate global symbol tables for XCOFF32
and XCOFF64 members (see Section 3.3.5, “Archiver” on page 64). This new
archive format is also used for all archives created on AIX 4.3, so the binder
reads the new archive format even when running in 32-bit mode.
The following new command line flags and options in import files are introduced:
• -b32 option
Specifies 32-bit linking mode. In this mode, all input object files must be
XCOFF32 files, or an error is reported. Only XCOFF32 archive members are
processed. Other archive members are ignored. For import files specifying the
mode of certain symbols, 64-bit imports are ignored.
• -b64 option
Specifies 64-bit linking mode. In this mode, all input object files must be
XCOFF64 files, or an error is reported. Only XCOFF64 archive members are
processed. Other archive members are ignored. For import files specifying the
mode of certain symbols, 32-bit imports are ignored.
• 32 option in an import file
This option can be used in an import file to specify that subsequent symbols
should be processed when linking in 32-bit mode but ignored when linking in
64-bit mode. If no 32 or 64 option is specified, all symbols are processed in
both 32 and 64-bit modes.
Note: The syntax for import file options is a pound sign (#) followed by a blank
followed by a list of options.
• 64 option in an import file
This option can be used in an import file to specify that subsequent symbols
should be processed when linking in 64-bit mode but ignored when linking in
32-bit mode. If no 32 or 64 option is specified, all symbols are processed in
both 32 and 64-bit modes.
• no32 or no64 option in an import file
This option overrides a previous 32 or 64 option. Subsequent symbols are
processed in both 32 and 64-bit modes.
• OBJECT_MODE environment variable
If the -b32 or -b64 options are not used, the OBJECT_MODE environment
variable is examined to determine the linking mode. If the value of
OBJECT_MODE is 64, 64-bit mode is used. If the value is 32_64, the linker
prints an error message and exits with a non-zero return code. Otherwise,
32-bit mode is used.
If both -b32 and -b64 options are specified, the last specified option is used. If
neither option is specified, the mode is determined from the value of the
environment variable OBJECT_MODE.
New keywords are recognized in import and export files. The keywords are svc64
and svc3264, with synonyms syscall64 and syscall3264. For ease of use, svc32
and syscall32 are added as well. They are equivalent to svc and syscall. All these
keywords may be in upper- or lower-case. The keywords are ignored in import
files. In export files, a symbol exported with the svc64 keyword is given
storage-mapping class XMC_SVC64 in the loader-section symbol table. Similarly,
64-Bit Enablement 63