компилятор C и C ++ проекта GNU (GNU project C and C++ compiler)
Параметры подробно (Options detail)
HPPA
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 runs on higher numbered architectures, but not
the other way around.
-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.
-mcaller-copies
The caller copies function arguments passed by hidden
reference. This option should be used with care as it is not
compatible with the default 32-bit runtime. However, only
aggregates larger than eight bytes are passed by hidden
reference and the option provides better compatibility with
OpenMP.
-mjump-in-delay
This option is ignored and provided for compatibility
purposes only.
-mdisable-fpregs
Prevent floating-point registers from being used in any
manner. This is necessary for compiling kernels that perform
lazy context switching of floating-point registers. If you
use this option and attempt to perform floating-point
operations, the compiler aborts.
-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 that performs
faster indirect calls.
This option does not work in the presence of shared libraries
or nested functions.
-mfixed-range=register-range
Generate code treating the given register range as fixed
registers. A fixed register is one that the register
allocator cannot use. This is useful when compiling kernel
code. A register range is specified as two registers
separated by a dash. Multiple register ranges can be
specified separated by a comma.
-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, 7300 and 8000. Refer to /usr/lib/sched.models
on an HP-UX system to determine the proper scheduling option
for your machine. The default scheduling is 8000.
-mlinker-opt
Enable the optimization pass in the HP-UX linker. Note this
makes symbolic debugging impossible. It also triggers a bug
in the HP-UX 8 and HP-UX 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.
-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.
-msio
Generate the predefine, "_SIO", for server IO. The default
is -mwsio. This generates the predefines, "__hp9000s700",
"__hp9000s700__" and "_WSIO", for workstation IO. These
options are available under HP-UX and HI-UX.
-mgnu-ld
Use options specific to GNU ld. This passes -shared to ld
when building a shared library. It is the default when GCC
is configured, explicitly or implicitly, with the GNU linker.
This option does not affect which ld is called; it only
changes what parameters are passed to that ld. The ld that
is called is determined by the --with-ld configure option,
GCC's program search path, and finally by the user's PATH.
The linker used by GCC can be printed using which `gcc
-print-prog-name=ld`. This option is only available on the
64-bit HP-UX GCC, i.e. configured with hppa*64*-*-hpux*.
-mhp-ld
Use options specific to HP ld. This passes -b to ld when
building a shared library and passes +Accept TypeMismatch to
ld on all links. It is the default when GCC is configured,
explicitly or implicitly, with the HP linker. This option
does not affect which ld is called; it only changes what
parameters are passed to that ld. The ld that is called is
determined by the --with-ld configure option, GCC's program
search path, and finally by the user's PATH. The linker used
by GCC can be printed using which `gcc -print-prog-name=ld`.
This option is only available on the 64-bit HP-UX GCC, i.e.
configured with hppa*64*-*-hpux*.
-mlong-calls
Generate code that uses long call sequences. This ensures
that a call is always able to reach linker generated stubs.
The default is to generate long calls only when the distance
from the call site to the beginning of the function or
translation unit, as the case may be, exceeds a predefined
limit set by the branch type being used. The limits for
normal calls are 7,600,000 and 240,000 bytes, respectively
for the PA 2.0 and PA 1.X architectures. Sibcalls are always
limited at 240,000 bytes.
Distances are measured from the beginning of functions when
using the -ffunction-sections option, or when using the -mgas
and -mno-portable-runtime options together under HP-UX with
the SOM linker.
It is normally not desirable to use this option as it
degrades performance. However, it may be useful in large
applications, particularly when partial linking is used to
build the application.
The types of long calls used depends on the capabilities of
the assembler and linker, and the type of code being
generated. The impact on systems that support long absolute
calls, and long pic symbol-difference or pc-relative calls
should be relatively small. However, an indirect call is
used on 32-bit ELF systems in pic code and it is quite long.
-munix=unix-std
Generate compiler predefines and select a startfile for the
specified UNIX standard. The choices for unix-std are 93, 95
and 98. 93 is supported on all HP-UX versions. 95 is
available on HP-UX 10.10 and later. 98 is available on HP-UX
11.11 and later. The default values are 93 for HP-UX 10.00,
95 for HP-UX 10.10 though to 11.00, and 98 for HP-UX 11.11
and later.
-munix=93 provides the same predefines as GCC 3.3 and 3.4.
-munix=95 provides additional predefines for "XOPEN_UNIX" and
"_XOPEN_SOURCE_EXTENDED", and the startfile unix95.o.
-munix=98 provides additional predefines for "_XOPEN_UNIX",
"_XOPEN_SOURCE_EXTENDED", "_INCLUDE__STDC_A1_SOURCE" and
"_INCLUDE_XOPEN_SOURCE_500", and the startfile unix98.o.
It is important to note that this option changes the
interfaces for various library routines. It also affects the
operational behavior of the C library. Thus, extreme care is
needed in using this option.
Library code that is intended to operate with more than one
UNIX standard must test, set and restore the variable
"__xpg4_extended_mask" as appropriate. Most GNU software
doesn't provide this capability.
-nolibdld
Suppress the generation of link options to search libdld.sl
when the -static option is specified on HP-UX 10 and later.
-static
The HP-UX implementation of setlocale in libc has a
dependency on libdld.sl. There isn't an archive version of
libdld.sl. Thus, when the -static option is specified,
special link options are needed to resolve this dependency.
On HP-UX 10 and later, the GCC driver adds the necessary
options to link with libdld.sl when the -static option is
specified. This causes the resulting binary to be dynamic.
On the 64-bit port, the linkers generate dynamic binaries by
default in any case. The -nolibdld option can be used to
prevent the GCC driver from adding these link options.
-threads
Add support for multithreading with the dce thread library
under HP-UX. This option sets flags for both the
preprocessor and linker.
