as: IA-64 Options
9.16.1 Options
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'-mconstant-gp'
This option instructs the assembler to mark the resulting object
file as using the "constant GP" model. With this model, it is
assumed that the entire program uses a single global pointer (GP)
value. Note that this option does not in any fashion affect the
machine code emitted by the assembler. All it does is turn on the
EF_IA_64_CONS_GP flag in the ELF file header.
'-mauto-pic'
This option instructs the assembler to mark the resulting object
file as using the "constant GP without function descriptor" data
model. This model is like the "constant GP" model, except that it
additionally does away with function descriptors. What this means
is that the address of a function refers directly to the function's
code entry-point. Normally, such an address would refer to a
function descriptor, which contains both the code entry-point and
the GP-value needed by the function. Note that this option does
not in any fashion affect the machine code emitted by the
assembler. All it does is turn on the EF_IA_64_NOFUNCDESC_CONS_GP
flag in the ELF file header.
'-milp32'
'-milp64'
'-mlp64'
'-mp64'
These options select the data model. The assembler defaults to
'-mlp64' (LP64 data model).
'-mle'
'-mbe'
These options select the byte order. The '-mle' option selects
little-endian byte order (default) and '-mbe' selects big-endian
byte order. Note that IA-64 machine code always uses little-endian
byte order.
'-mtune=itanium1'
'-mtune=itanium2'
Tune for a particular IA-64 CPU, ITANIUM1 or ITANIUM2. The default
is ITANIUM2.
'-munwind-check=warning'
'-munwind-check=error'
These options control what the assembler will do when performing
consistency checks on unwind directives. '-munwind-check=warning'
will make the assembler issue a warning when an unwind directive
check fails. This is the default. '-munwind-check=error' will
make the assembler issue an error when an unwind directive check
fails.
'-mhint.b=ok'
'-mhint.b=warning'
'-mhint.b=error'
These options control what the assembler will do when the 'hint.b'
instruction is used. '-mhint.b=ok' will make the assembler accept
'hint.b'. '-mint.b=warning' will make the assembler issue a
warning when 'hint.b' is used. '-mhint.b=error' will make the
assembler treat 'hint.b' as an error, which is the default.
'-x'
'-xexplicit'
These options turn on dependency violation checking.
'-xauto'
This option instructs the assembler to automatically insert stop
bits where necessary to remove dependency violations. This is the
default mode.
'-xnone'
This option turns off dependency violation checking.
'-xdebug'
This turns on debug output intended to help tracking down bugs in
the dependency violation checker.
'-xdebugn'
This is a shortcut for -xnone -xdebug.
'-xdebugx'
This is a shortcut for -xexplicit -xdebug.
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as: IA-64 Syntax