GNU Info
(gcc-295.info)HPPA Options
HPPA Options
------------
These `-m' options are defined for the HPPA family of computers:
`-march=ARCHITECTURE TYPE'
Generate code for the specified architecture. The choices for
ARCHITECTURE TYPE are `1.0' for PA 1.0, `1.1' for PA 1.1, and
`2.0' for PA 2.0 processors. Refer to `/usr/lib/sched.models' on
an HP-UX system to determine the proper architecture option for
your machine. Code compiled for lower numbered architectures will
run on higher numbered architectures, but not the other way around.
PA 2.0 support currently requires gas snapshot 19990413 or later.
The next release of binutils (current is 2.9.1) will probably
contain PA 2.0 support.
`-mpa-risc-1-0'
`-mpa-risc-1-1'
`-mpa-risc-2-0'
Synonyms for -march=1.0, -march=1.1, and -march=2.0 respectively.
`-mbig-switch'
Generate code suitable for big switch tables. Use this option
only if the assembler/linker complain about out of range branches
within a switch table.
`-mjump-in-delay'
Fill delay slots of function calls with unconditional jump
instructions by modifying the return pointer for the function call
to be the target of the conditional jump.
`-mdisable-fpregs'
Prevent floating point registers from being used in any manner.
This is necessary for compiling kernels which perform lazy context
switching of floating point registers. If you use this option and
attempt to perform floating point operations, the compiler will
abort.
`-mdisable-indexing'
Prevent the compiler from using indexing address modes. This
avoids some rather obscure problems when compiling MIG generated
code under MACH.
`-mno-space-regs'
Generate code that assumes the target has no space registers.
This allows GCC to generate faster indirect calls and use unscaled
index address modes.
Such code is suitable for level 0 PA systems and kernels.
`-mfast-indirect-calls'
Generate code that assumes calls never cross space boundaries.
This allows GCC to emit code which performs faster indirect calls.
This option will not work in the presense of shared libraries or
nested functions.
`-mspace'
Optimize for space rather than execution time. Currently this only
enables out of line function prologues and epilogues. This option
is incompatible with PIC code generation and profiling.
`-mlong-load-store'
Generate 3-instruction load and store sequences as sometimes
required by the HP-UX 10 linker. This is equivalent to the `+k'
option to the HP compilers.
`-mportable-runtime'
Use the portable calling conventions proposed by HP for ELF
systems.
`-mgas'
Enable the use of assembler directives only GAS understands.
`-mschedule=CPU TYPE'
Schedule code according to the constraints for the machine type
CPU TYPE. The choices for CPU TYPE are `700' `7100', `7100LC',
`7200', and `8000'. Refer to `/usr/lib/sched.models' on an HP-UX
system to determine the proper scheduling option for your machine.
`-mlinker-opt'
Enable the optimization pass in the HPUX linker. Note this makes
symbolic debugging impossible. It also triggers a bug in the HPUX
8 and HPUX 9 linkers in which they give bogus error messages when
linking some programs.
`-msoft-float'
Generate output containing library calls for floating point.
*Warning:* the requisite libraries are not available for all HPPA
targets. Normally the facilities of the machine's usual C
compiler are used, but this cannot be done directly in
cross-compilation. You must make your own arrangements to provide
suitable library functions for cross-compilation. The embedded
target `hppa1.1-*-pro' does provide software floating point
support.
`-msoft-float' changes the calling convention in the output file;
therefore, it is only useful if you compile *all* of a program with
this option. In particular, you need to compile `libgcc.a', the
library that comes with GCC, with `-msoft-float' in order for this
to work.
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