emcc gmp/mpfr/mpir

[leopard]

hi all,

I tried to convert mpir (a multiple precision lib) to javascript via emscripten under windows 64bit and failed, it said "mpn/generic/get_d.c:125:34: error: variable has incomplete type 'union ieee_double_extract'".  

I googled and somebody compiled gmp/mpfr sucessfully under win 32bit with empscripten, but failed under 64bit too.  Anybody ever make it work under win64?

thanks,

wei. 

[Sam Clegg]

Emscripten and WebAssembly are inherently always 32-bit, regardless of the machine you use to compile.

Regarding your specific compile error you probably need to look at the various ways the `ieee_double_extract` type is being defined in the library headers.  It could be that its inside an `ifdef` or that you need to modify the library at the location of the type definition.

cheers,

sam

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[Floh]

I don't know the mpn library, but it seems this is an autoconf-related configuration error, look here:

https://clgitlab.o9n.de/Kryptographische-Protokolle/Zettel1/-/blob/master/c/lib/gmp/gmp-impl.h#L3735-3778

...the union ieee_double_extract only exists when either the define HAVE_DOUBLE_IEEE_LITTLE_SWAPPED, HAVE_DOUBLE_IEEE_LITTLE_ENDIAN or HAVE_DOUBLE_IEEE_BIG_ENDIAN exists, these seem to be autoconf-generated configuration defines (https://clgitlab.o9n.de/Kryptographische-Protokolle/Zettel1/-/blob/master/c/lib/gmp/configure#L24758). So either autoconf wasn't run, or it was confused by the emscripten toolchain.