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<h3 class="section">3.9 Compatibility with older versions</h3>
<a name="index-Compatibility-with-older-versions"></a>
<a name="index-Past-GMP-versions"></a>
<a name="index-Upward-compatibility"></a>
<p>This version of GMP is upwardly binary compatible with all 5.x, 4.x, and 3.x
versions, and upwardly compatible at the source level with all 2.x versions,
with the following exceptions.
</p>
<ul>
<li> <code>mpn_gcd</code> had its source arguments swapped as of GMP 3.0, for consistency
with other <code>mpn</code> functions.
</li><li> <code>mpf_get_prec</code> counted precision slightly differently in GMP 3.0 and
3.0.1, but in 3.1 reverted to the 2.x style.
</li><li> <code>mpn_bdivmod</code>, documented as preliminary in GMP 4, has been removed.
</li></ul>
<p>There are a number of compatibility issues between GMP 1 and GMP 2 that of
course also apply when porting applications from GMP 1 to GMP 5. Please
see the GMP 2 manual for details.
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