When I attempt building a project containing both Zig and C for FreeBSD or OpenBSD on my Linux system, it appears that Zig can’t find system headers like stdio.h
or stdint.h
. Compiling for Linux, macOS and Windows all work for this example.
src/main.c:
#include <stdio.h>
#include <stdint.h>
uint32_t mul(uint32_t a, uint32_t b) {
return a * b;
}
src/main.zig:
const std = @import("std");
extern fn mul(a: u32, b: u32) u32;
pub fn main() !void {
std.debug.print("From C: {d}\n", .{mul(420, 69)});
}
build.zig:
const std = @import("std");
pub fn build(b: *std.Build) void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const exe = b.addExecutable(.{
.name = "ctest",
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
exe.addCSourceFile(.{
.file = .{ .path = "src/main.c" },
.flags = &[_][]const u8{},
});
exe.linkLibC();
b.installArtifact(exe);
const run_cmd = b.addRunArtifact(exe);
run_cmd.step.dependOn(b.getInstallStep());
if (b.args) |args| {
run_cmd.addArgs(args);
}
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
}
For some reason though, FreeBSD and OpenBSD both fail to build due to “error: ‘stdio.h’ file not found”. Can you not cross-compile to them by default or an I doing something incorrect here?