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Discussion on: Extend a C/C++ Project with Zig

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sekoyo profile image
sekoyo • • Edited

Thank you, though it would be great if there was a paired down hello world example (with an example of linking still), and redis is C I don't see any example of C++ compilation in github.com/kristoff-it/redis/blob/... ?

Edit, all good, I didn't realize addCSourceFiles is also for CPP files and then the only other step is linkLibCpp:

const std = @import("std");

pub fn build(b: *std.build.Builder) void {
    const target = b.standardTargetOptions(.{});
    const mode = b.standardReleaseOptions();

    const my_app = b.addExecutable("my_app", null);
    my_app.setTarget(target);
    my_app.setBuildMode(mode);
    my_app.install();
    // Add your .addIncludeDir or .linkLibrary here
    my_app.linkLibCpp();
    my_app.addCSourceFiles(&.{
        "src/main.cc",
    }, &.{
        "-std=c++20",
    });
}
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kristoff profile image
Loris Cro •

Yes, jemalloc is the depedency that makes Redis technically also a C++ project, but you're right, we didn't build it once we started doing cross-compilation (and instead defaulted to vanilla malloc), but we did compile it in the beginning when just replacing clang with zig cc.

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spirobel profile image
spirobel •

is it possible to call cpp directly from zig or do I need to make a C wrapper for cpp code and then call that from zig?

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kristoff profile image
Loris Cro •

you have to make a C wrapper

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spirobel profile image
spirobel •

how do you go about calling cpp from zig? you need to write a C wrapper, correct? Is there a tutorial on how to write these kinds of wrappers?
you probably also need to handle exceptions and turn them into normal value like errors, right?
I came accross this one: teddy.ch/c++_library_in_c it is not specific to zig. I guess especially exceptions need to be handled carefully, because zig does not support that, right?