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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="HPPA%20Options">HPPA Options</a>,Next: <a rel="next" accesskey="n" href="DEC-Alpha-Options.html#DEC%20Alpha%20Options">DEC Alpha Options</a>,Previous: <a rel="previous" accesskey="p" href="i386-and-x86-64-Options.html#i386%20and%20x86-64%20Options">i386 and x86-64 Options</a>,Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel%20Options">Submodel Options</a><hr><br></div><h3 class="subsection">HPPA Options</h4><p>These <code>-m</code> options are defined for the HPPA family of computers: <dl><dt><code>-march=</code><var>architecture-type</var><code></code> <dd>Generate code for the specified architecture. The choices for<var>architecture-type</var> are <code>1.0</code> for PA 1.0, <code>1.1</code> for PA1.1, and <code>2.0</code> for PA 2.0 processors. Refer to<code>/usr/lib/sched.models</code> on an HP-UX system to determine the properarchitecture option for your machine. Code compiled for lower numberedarchitectures will run on higher numbered architectures, but not theother way around. <p>PA 2.0 support currently requires gas snapshot 19990413 or later. Thenext release of binutils (current is 2.9.1) will probably contain PA 2.0support. <br><dt><code>-mpa-risc-1-0</code> <dd><dt><code>-mpa-risc-1-1</code> <dd><dt><code>-mpa-risc-2-0</code> <dd>Synonyms for <code>-march=1.0</code>, <code>-march=1.1</code>, and <code>-march=2.0</code> respectively. <br><dt><code>-mbig-switch</code> <dd>Generate code suitable for big switch tables. Use this option only ifthe assembler/linker complain about out of range branches within a switchtable. <br><dt><code>-mjump-in-delay</code> <dd>Fill delay slots of function calls with unconditional jump instructionsby modifying the return pointer for the function call to be the targetof the conditional jump. <br><dt><code>-mdisable-fpregs</code> <dd>Prevent floating point registers from being used in any manner. This isnecessary for compiling kernels which perform lazy context switching offloating point registers. If you use this option and attempt to performfloating point operations, the compiler will abort. <br><dt><code>-mdisable-indexing</code> <dd>Prevent the compiler from using indexing address modes. This avoids somerather obscure problems when compiling MIG generated code under MACH. <br><dt><code>-mno-space-regs</code> <dd>Generate code that assumes the target has no space registers. This allowsGCC to generate faster indirect calls and use unscaled index address modes. <p>Such code is suitable for level 0 PA systems and kernels. <br><dt><code>-mfast-indirect-calls</code> <dd>Generate code that assumes calls never cross space boundaries. Thisallows GCC to emit code which performs faster indirect calls. <p>This option will not work in the presence of shared libraries or nestedfunctions. <br><dt><code>-mlong-load-store</code> <dd>Generate 3-instruction load and store sequences as sometimes required bythe HP-UX 10 linker. This is equivalent to the <code>+k</code> option tothe HP compilers. <br><dt><code>-mportable-runtime</code> <dd>Use the portable calling conventions proposed by HP for ELF systems. <br><dt><code>-mgas</code> <dd>Enable the use of assembler directives only GAS understands. <br><dt><code>-mschedule=</code><var>cpu-type</var><code></code> <dd>Schedule code according to the constraints for the machine type<var>cpu-type</var>. The choices for <var>cpu-type</var> are <code>700</code><code>7100</code>, <code>7100LC</code>, <code>7200</code>, <code>7300</code> and <code>8000</code>. Referto <code>/usr/lib/sched.models</code> on an HP-UX system to determine theproper scheduling option for your machine. The default scheduling is<code>8000</code>. <br><dt><code>-mlinker-opt</code> <dd>Enable the optimization pass in the HP-UX linker. Note this makes symbolicdebugging impossible. It also triggers a bug in the HP-UX 8 and HP-UX 9linkers in which they give bogus error messages when linking some programs. <br><dt><code>-msoft-float</code> <dd>Generate output containing library calls for floating point. <strong>Warning:</strong> the requisite libraries are not available for all HPPAtargets. Normally the facilities of the machine's usual C compiler areused, but this cannot be done directly in cross-compilation. You must makeyour own arrangements to provide suitable library functions forcross-compilation. The embedded target <code>hppa1.1-*-pro</code>does provide software floating point support. <p><code>-msoft-float</code> changes the calling convention in the output file;therefore, it is only useful if you compile <em>all</em> of a program withthis option. In particular, you need to compile <code>libgcc.a</code>, thelibrary that comes with GCC, with <code>-msoft-float</code> in order forthis to work. <br><dt><code>-msio</code> <dd>Generate the predefine, <code>_SIO</code>, for server IO. The default is<code>-mwsio</code>. This generates the predefines, <code>__hp9000s700</code>,<code>__hp9000s700__</code> and <code>_WSIO</code>, for workstation IO. Theseoptions are available under HP-UX and HI-UX. <br><dt><code>-mgnu-ld</code> <dd>Use GNU ld specific options. This passes <code>-shared</code> to ld whenbuilding a shared library. It is the default when GCC is configured,explicitly or implicitly, with the GNU linker. This option does nothave any affect on which ld is called, it only changes what parametersare passed to that ld. The ld that is called is determined by the<code>--with-ld</code> configure option, GCC's program search path, andfinally by the user's <code>PATH</code>. The linker used by GCC can be printedusing <code>which `gcc -print-prog-name=ld`</code>. <br><dt><code>-mhp-ld</code> <dd>Use HP ld specific options. This passes <code>-b</code> to ld when buildinga shared library and passes <code>+Accept TypeMismatch</code> to ld on alllinks. It is the default when GCC is configured, explicitly orimplicitly, with the HP linker. This option does not have any affect onwhich ld is called, it only changes what parameters are passed to thatld. The ld that is called is determined by the <code>--with-ld</code>configure option, GCC's program search path, and finally by the user's<code>PATH</code>. The linker used by GCC can be printed using <code>which`gcc -print-prog-name=ld`</code>. <br><dt><code>-mfdpic</code> <dd> <p>Select the FDPIC ABI, that uses function descriptors to representpointers to functions. Without any PIC/PIE-related options, itimplies <code>-fPIE</code>. With <code>-fpic</code> or <code>-fpie</code>, itassumes GOT entries and small data are within a 12-bit range from theGOT base address; with <code>-fPIC</code> or <code>-fPIE</code>, GOT offsetsare computed with 32 bits. <br><dt><code>-minline-plt</code> <dd> <p>Enable inlining of PLT entries in function calls to functions that arenot known to bind locally. It has no effect without <code>-mfdpic</code>. It's enabled by default if optimizing for speed and compiling forshared libraries (i.e., <code>-fPIC</code> or <code>-fpic</code>), or when anoptimization option such as <code>-O3</code> or above is present in thecommand line. <br><dt><code>-mgprel-ro</code> <dd> <p>Enable the use of <code>GPREL</code> relocations in the FDPIC ABI for datathat is known to be in read-only sections. It's enabled by default,except for <code>-fpic</code> or <code>-fpie</code>: even though it may helpmake the global offset table smaller, it trades 1 instruction for 4. With <code>-fPIC</code> or <code>-fPIE</code>, it trades 3 instructions for 4,one of which may be shared by multiple symbols, and it avoids the needfor a GOT entry for the referenced symbol, so it's more likely to be awin. If it is not, <code>-mno-gprel-ro</code> can be used to disable it. <br><dt><code>-multilib-library-pic</code> <dd> <p>Link with the (library, not FD) pic libraries. It's implied by<code>-mlibrary-pic</code>, as well as by <code>-fPIC</code> and<code>-fpic</code> without <code>-mfdpic</code>. You should never have to useit explicitly. <br><dt><code>-mlinked-fp</code> <dd> <p>Follow the EABI requirement of always creating a frame pointer whenevera stack frame is allocated. This option is enabled by default and canbe disabled with <code>-mno-linked-fp</code>. <br><dt><code>-mlong-calls</code> <dd>Generate code that uses long call sequences. This ensures that a callis always able to reach linker generated stubs. The default is to generatelong calls only when the distance from the call site to the beginningof the function or translation unit, as the case may be, exceeds apredefined limit set by the branch type being used. The limits fornormal calls are 7,600,000 and 240,000 bytes, respectively for thePA 2.0 and PA 1.X architectures. Sibcalls are always limited at240,000 bytes. <p>Distances are measured from the beginning of functions when using the<code>-ffunction-sections</code> option, or when using the <code>-mgas</code>and <code>-mno-portable-runtime</code> options together under HP-UX withthe SOM linker. <p>It is normally not desirable to use this option as it will degradeperformance. However, it may be useful in large applications,particularly when partial linking is used to build the application. <p>The types of long calls used depends on the capabilities of theassembler and linker, and the type of code being generated. Theimpact on systems that support long absolute calls, and long picsymbol-difference or pc-relative calls should be relatively small. However, an indirect call is used on 32-bit ELF systems in pic codeand it is quite long. <br><dt><code>-nolibdld</code> <dd>Suppress the generation of link options to search libdld.sl when the<code>-static</code> option is specified on HP-UX 10 and later. <br><dt><code>-static</code> <dd>The HP-UX implementation of setlocale in libc has a dependency onlibdld.sl. There isn't an archive version of libdld.sl. Thus,when the <code>-static</code> option is specified, special link optionsare needed to resolve this dependency. <p>On HP-UX 10 and later, the GCC driver adds the necessary options tolink with libdld.sl when the <code>-static</code> 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<code>-nolibdld</code> option can be used to prevent the GCC driver fromadding these link options. <br><dt><code>-threads</code> <dd>Add support for multithreading with the <dfn>dce thread</dfn> libraryunder HP-UX. This option sets flags for both the preprocessor andlinker. </dl> </body></html>⌨️ 快捷键说明
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