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POHow to use gcc and -msoft-float on an i386/x86-64?
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2011-11-22T11:13:39.550
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<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/1018638/using-software-floating-point-on-x86-linux">Using software floating point on x86 linux</a> </blockquote> Just for educational reasons I'd like to compile some programmes using the <code>-msoft-float</code> option of <code>gcc</code>, i.e. doing floating point arithmetic without using the x87/sse fpu unit. Take a simple example: <pre><code>#include <cstdio> int main(int argc, char** argv) { double x=3.14; double y=2.71; double z=x+y; printf("z=%f\n",z); return 0; } </code></pre> Compile with either (need to disable sse otherwise <code>-msoft-float</code> has no effect) <pre><code>g++ -msoft-float -mfpmath=387 float.cpp g++ -msoft-float -m32 float.cpp </code></pre> and I get <pre><code>float.cpp:(.text+0x36): undefined reference to `__adddf3' </code></pre> Now the man page warns me that I might need to provide my own soft-float library. However, since I'm not doing cross-compilation, does this still apply? <pre><code> -msoft-float Generate output containing library calls for floating point. Warning: the requisite libraries are not part of GCC. Normally the facilities of the machine's usual C compiler are used, but this can't be done directly in cross-compilation. You must make your own arrangements to provide suitable library functions for cross- compilation. </code></pre> I checked <code>libgcc_s.so</code> as well as other libraries and <code>__adddf3</code> is indeed nowhere to be found. I also looked into the <code>gcc-4.6.2</code> source code and there's a directory <code>./gcc/config/soft-fp/</code> with all the soft-float routines, but I failed to compile them by hand. So is there a way to just compile a soft-float library (or do I have to compile a whole new gcc) or have I overseen something more simple?
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<gcc><g++><floating-point>
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How to use gcc and -msoft-float on an i386/x86-64?
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