HPPA OptionsContents|Index|Previous|Next HPPA
options The following ‘-m’
options are defined for the HPPA family of computers.
-mpa-risc-1-0
Generate code for a PA 1.0
processor.
-mpa-risc-1-1
Generate code for a PA 1.1
processor.
-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 HPUX 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 cputype are
700
for 7n0
machines, 7100
for 7n5
machines, and 7100
for 7n2
machines. 7100
is the default for cpu
type.
Note:
The 7100LC
scheduling information is incomplete and using 7100LC
often leads to bad schedules. For now it’s probably best to use 7100
instead of 7100LC
for the 7n2
machines.
-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 GNU CC, with -msoft-float
in order for this to work.
