Building DFT in GCC and MSVC

[dancasarin]

For now, KFR DFT can be built only using Clang/Xcode.

Building with GCC 7 has been recently added while GCC 8 & 9 have bug described here: https://github.com/kfrlib/kfr/issues/56 that prevents from building correct code for optimized binaries.

MSVC does not work too, because of ICE, out of heap space etc.

All KFR code that does not use DFT works correctly with all these compilers.

[mipac]

in dev branch, what is the dft status?

is it possible to compile with clang 4.0 and link the lib with gcc 6.3 to the main?

[dancasarin]

It's possible to build KFR DFT with clang 6+ and use it with any compatible compiler (GCC 7+). Older versions may be supported too (and were supported in previous versions of KFR), you can test.

If you need DFT only and can use dynamic linking, you can build KFR C API (clang required). Then the resulting shared library can be used with any C compiler.

All changes required to build C API are already published in dev branch.

[mipac]

I need to test Thank you very much for your answer

[reFX-Mike]

Is this still an issue with the latest msvc 2019 16.6.3? If yes, wouldn’t it make sense to report it to MS?

[mipac]

i've test on debian

• compile dft lib with clang6+ and stdc++
• compile my app with gcc 8 and link with dft

it works 👍

[reFX-Mike]

Now that MSVC 2022 is out and available as 64-bit, can somebody try again if the DFT compiles successfully now?

[LCVitality]

Now that MSVC 2022 is out and available as 64-bit, can somebody try again if the DFT compiles successfully now?

I tried with vs2022 17.5, the compilation was passed but the speed of the dft example was 5-10 times slower than clang. I modified the data size of that example to 65536 * 2.