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132 lines
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HTML
4 years ago
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<title>V850 Options - Using as</title>
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<link rel="up" href="V850_002dDependent.html#V850_002dDependent" title="V850-Dependent">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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<div class="node">
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<a name="V850-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="V850-Syntax.html#V850-Syntax">V850 Syntax</a>,
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Up: <a rel="up" accesskey="u" href="V850_002dDependent.html#V850_002dDependent">V850-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.47.1 Options</h4>
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<p><a name="index-V850-options-_0028none_0029-2255"></a><a name="index-options-for-V850-_0028none_0029-2256"></a><code>as</code> supports the following additional command-line options
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for the V850 processor family:
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<p><a name="index-command-line-options_002c-V850-2257"></a><a name="index-V850-command-line-options-2258"></a>
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<a name="index-g_t_0040code_007b_002dwsigned_005foverflow_007d-command-line-option_002c-V850-2259"></a>
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<dl><dt><code>-wsigned_overflow</code><dd>Causes warnings to be produced when signed immediate values overflow the
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space available for then within their opcodes. By default this option
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is disabled as it is possible to receive spurious warnings due to using
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exact bit patterns as immediate constants.
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<p><a name="index-g_t_0040code_007b_002dwunsigned_005foverflow_007d-command-line-option_002c-V850-2260"></a><br><dt><code>-wunsigned_overflow</code><dd>Causes warnings to be produced when unsigned immediate values overflow
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the space available for then within their opcodes. By default this
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option is disabled as it is possible to receive spurious warnings due to
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using exact bit patterns as immediate constants.
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<p><a name="index-g_t_0040code_007b_002dmv850_007d-command-line-option_002c-V850-2261"></a><br><dt><code>-mv850</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850 processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmv850e_007d-command-line-option_002c-V850-2262"></a><br><dt><code>-mv850e</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850E processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmv850e1_007d-command-line-option_002c-V850-2263"></a><br><dt><code>-mv850e1</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850E1 processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmv850any_007d-command-line-option_002c-V850-2264"></a><br><dt><code>-mv850any</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850 processor but support instructions that are specific to the
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extended variants of the process. This allows the production of
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binaries that contain target specific code, but which are also intended
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to be used in a generic fashion. For example libgcc.a contains generic
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routines used by the code produced by GCC for all versions of the v850
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architecture, together with support routines only used by the V850E
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architecture.
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<p><a name="index-g_t_0040code_007b_002dmv850e2_007d-command-line-option_002c-V850-2265"></a><br><dt><code>-mv850e2</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850E2 processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmv850e2v3_007d-command-line-option_002c-V850-2266"></a><br><dt><code>-mv850e2v3</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850E2V3 processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmv850e2v4_007d-command-line-option_002c-V850-2267"></a><br><dt><code>-mv850e2v4</code><dd>This is an alias for <samp><span class="option">-mv850e3v5</span></samp>.
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<p><a name="index-g_t_0040code_007b_002dmv850e3v5_007d-command-line-option_002c-V850-2268"></a><br><dt><code>-mv850e3v5</code><dd>Specifies that the assembled code should be marked as being targeted at
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the V850E3V5 processor. This allows the linker to detect attempts to link
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such code with code assembled for other processors.
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<p><a name="index-g_t_0040code_007b_002dmrelax_007d-command-line-option_002c-V850-2269"></a><br><dt><code>-mrelax</code><dd>Enables relaxation. This allows the .longcall and .longjump pseudo
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ops to be used in the assembler source code. These ops label sections
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of code which are either a long function call or a long branch. The
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assembler will then flag these sections of code and the linker will
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attempt to relax them.
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<p><a name="index-g_t_0040code_007b_002dmgcc_002dabi_007d-command-line-option_002c-V850-2270"></a><br><dt><code>-mgcc-abi</code><dd>Marks the generated object file as supporting the old GCC ABI.
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<p><a name="index-g_t_0040code_007b_002dmrh850_002dabi_007d-command-line-option_002c-V850-2271"></a><br><dt><code>-mrh850-abi</code><dd>Marks the generated object file as supporting the RH850 ABI. This is
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the default.
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<p><a name="index-g_t_0040code_007b_002dm8byte_002dalign_007d-command-line-option_002c-V850-2272"></a><br><dt><code>-m8byte-align</code><dd>Marks the generated object file as supporting a maximum 64-bits of
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alignment for variables defined in the source code.
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<p><a name="index-g_t_0040code_007b_002dm4byte_002dalign_007d-command-line-option_002c-V850-2273"></a><br><dt><code>-m4byte-align</code><dd>Marks the generated object file as supporting a maximum 32-bits of
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alignment for variables defined in the source code. This is the
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default.
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<p><a name="index-g_t_0040code_007b_002dmsoft_002dfloat_007d-command-line-option_002c-V850-2274"></a><br><dt><code>-msoft-float</code><dd>Marks the generated object file as not using any floating point
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instructions - and hence can be linked with other V850 binaries
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that do or do not use floating point. This is the default for
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binaries for architectures earlier than the <code>e2v3</code>.
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<p><a name="index-g_t_0040code_007b_002dmhard_002dfloat_007d-command-line-option_002c-V850-2275"></a><br><dt><code>-mhard-float</code><dd>Marks the generated object file as one that uses floating point
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instructions - and hence can only be linked with other V850 binaries
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that use the same kind of floating point instructions, or with
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binaries that do not use floating point at all. This is the default
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for binaries the <code>e2v3</code> and later architectures.
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</dl>
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</body></html>
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