Bug 23584 – ImportC: __builtin_bit_cast not supported

Compiling the following C code: int foo(float bar) { return __builtin_bit_cast(unsigned int, bar); } Results in the following errors: foo.c(3): Error: expression expected, not `unsigned` foo.c(3): Error: found `int` when expecting `)` foo.c(3): Error: found `)` when expecting `;` following `return` statement I'm using macOS 13.0.1, DMD v2.101.1 and Xcode 14.2.

Why do you expect DMD to implement GDC/GCC built-ins? (LDC might support them via Clang too, but is not guaranteed).

I'm just trying to compile a C project and reporting compile errors as they appear. The module __builtins.di already contains subs or implementations of a couple of __builtins. Since it's not possible to pass types to regular functions a macro needs to be added to importc.h that rewrites it to something that DMD can handle. I added the following to importc.h: #define __builtin_bit_cast(type,expr) (type) expr And then could at least continue compiling until the next error.

Jacob, yes please on posting everything you run into.

@WalterBright created dlang/dmd pull request #14795 "fix Issue 23584 - ImportC: __builtin_bit_cast not supported" fixing this issue: - fix Issue 23584 - ImportC: __builtin_bit_cast not supported https://github.com/dlang/dmd/pull/14795

dlang/dmd pull request #14795 "fix Issue 23584 - ImportC: __builtin_bit_cast not supported" was merged into master: - 9ffb041d07cc5b3b47a803a18d1b7b31a6e79d6b by Walter Bright: fix Issue 23584 - ImportC: __builtin_bit_cast not supported https://github.com/dlang/dmd/pull/14795