- The relative paths of all files are as follows
src
|-- main.zig
|-- c.zig
|-- cxmath.h
|-- cxmath.c
build.zig
main.zig
const std = @import("std");
const c = @import("c.zig");
pub fn main() !void {
_ = c.printf("Hello\n");
//_ = c.printf("%d\n", cxadd(12, 34));
sayHi();
}
c.zig
pub usingnamespace @cImport({
@cInclude("stdio.h");
@cInclude("cxmath.h");
});
cxmath.h
#ifndef CXMATH_H_INCLUDED
#define CXMATH_H_INCLUDED
#include <stdio.h>
int cxadd(int a, int b);
void sayHi();
#endif // CXMATH_H_INCLUDED
cxmath.c
#include "cxmath.h"
void sayHi()
{
printf("Hi\n");
}
int cxadd(int a, int b)
{
return a + b;
}
build.zig
const std = @import("std");
const Build = std.build;
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
const exe = b.addExecutable(.{
.name = "hello-world",
// In this case the main source file is merely a path, however, in more
// complicated build scripts, this could be a generated file.
.root_source_file = .{ .path = "src/main.zig" },
.target = target,
.optimize = optimize,
});
exe.addCSourceFile(.{
.file = Build.LazyPath.relative("src/cxmath.c"),
.flags = &[_][]const u8{"-std=c99"},
});
exe.addIncludePath(Build.LazyPath.relative("src"));
exe.linkSystemLibrary("c");
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
}
I ran 2 commands:
- zig init-exe
- zig build
Output:
src/main.zig:7:2: error: use of undeclared identifier 'sayHi'
How to fix it? I’m new here.