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    <p>It is surprising that gcc doesn't support this natively as the code is clearly available in the source within a directory called <code>soft-fp</code>. It's possible to compile that library manually:</p> <pre><code>$ svn co svn://gcc.gnu.org/svn/gcc/trunk/libgcc/ libgcc $ cd libgcc/soft-fp/ $ gcc -c -O2 -msoft-float -m32 -I../config/arm/ -I.. *.c $ ar -crv libsoft-fp.a *.o </code></pre> <p>There are a few c files which don't compile due to errors but the majority does compile. After copying <code>libsoft-fp.a</code> into the directory with our source files they now compile fine with <code>-msoft-float</code>:</p> <pre><code>$ gcc -g -m32 -msoft-float test.c -lsoft-fp -L. </code></pre> <p>A quick inspection using</p> <pre><code>$ objdump -D --disassembler-options=intel a.out | less </code></pre> <p>shows that as expected no x87 floating point instructions are called and the code runs considerably slower as well, by a factor of 8 in my example which uses lots of division.</p> <p><strong>Note:</strong> I would've preferred to compile the soft-float library with</p> <pre><code>$ gcc -c -O2 -msoft-float -m32 -I../config/i386/ -I.. *.c </code></pre> <p>but that results in loads of error messages like</p> <pre><code>adddf3.c: In function '__adddf3': adddf3.c:46: error: unknown register name 'st(1)' in 'asm' </code></pre> <p>Seems like the <code>i386</code> version is not well maintained as <code>st(1)</code> points to one of the x87 registers which are obviously not available when using <code>-msoft-float</code>. Strangely or luckily the <code>arm</code> version compiles fine on an <code>i386</code> and seems to work just fine.</p>
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