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| <h3 class="section">8.1 <span class="sc">gnu</span> Object Attributes</h3> |
| |
| <p>The <code>.gnu_attribute</code> directive records an object attribute |
| with vendor ‘<samp><span class="samp">gnu</span></samp>’. |
| |
| <p>Except for ‘<samp><span class="samp">Tag_compatibility</span></samp>’, which has both an integer and a string for |
| its value, <span class="sc">gnu</span> attributes have a string value if the tag number is odd and |
| an integer value if the tag number is even. The second bit (<var>tag</var><code> & |
| 2</code> is set for architecture-independent attributes and clear for |
| architecture-dependent ones. |
| |
| <h4 class="subsection">8.1.1 Common <span class="sc">gnu</span> attributes</h4> |
| |
| <p>These attributes are valid on all architectures. |
| |
| <dl> |
| <dt><span class="roman">Tag_compatibility (32)</span><dd>The compatibility attribute takes an integer flag value and a vendor name. If |
| the flag value is 0, the file is compatible with other toolchains. If it is 1, |
| then the file is only compatible with the named toolchain. If it is greater |
| than 1, the file can only be processed by other toolchains under some private |
| arrangement indicated by the flag value and the vendor name. |
| </dl> |
| |
| <h4 class="subsection">8.1.2 MIPS Attributes</h4> |
| |
| <dl> |
| <dt><span class="roman">Tag_GNU_MIPS_ABI_FP (4)</span><dd>The floating-point ABI used by this object file. The value will be: |
| |
| <ul> |
| <li>0 for files not affected by the floating-point ABI. |
| <li>1 for files using the hardware floating-point with a standard double-precision |
| FPU. |
| <li>2 for files using the hardware floating-point ABI with a single-precision FPU. |
| <li>3 for files using the software floating-point ABI. |
| <li>4 for files using the hardware floating-point ABI with 64-bit wide |
| double-precision floating-point registers and 32-bit wide general |
| purpose registers. |
| </ul> |
| </dl> |
| |
| <h4 class="subsection">8.1.3 PowerPC Attributes</h4> |
| |
| <dl> |
| <dt><span class="roman">Tag_GNU_Power_ABI_FP (4)</span><dd>The floating-point ABI used by this object file. The value will be: |
| |
| <ul> |
| <li>0 for files not affected by the floating-point ABI. |
| <li>1 for files using double-precision hardware floating-point ABI. |
| <li>2 for files using the software floating-point ABI. |
| <li>3 for files using single-precision hardware floating-point ABI. |
| </ul> |
| |
| <br><dt><span class="roman">Tag_GNU_Power_ABI_Vector (8)</span><dd>The vector ABI used by this object file. The value will be: |
| |
| <ul> |
| <li>0 for files not affected by the vector ABI. |
| <li>1 for files using general purpose registers to pass vectors. |
| <li>2 for files using AltiVec registers to pass vectors. |
| <li>3 for files using SPE registers to pass vectors. |
| </ul> |
| </dl> |
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