a88c0b4d08
Also clean up parsing of linker args - reuse `ArgsIterator`. In MachO, ensure we add every symbol marked with `-u` as undefined before proceeding with symbol resolution. Additionally, ensure those symbols are never garbage collected. MachO entry_in_dylib test: pass `-u _my_main` when linking executable so that it is not incorrectly garbage collected by the linker.
55 lines
1.6 KiB
Zig
55 lines
1.6 KiB
Zig
const std = @import("std");
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pub const requires_symlinks = true;
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pub fn build(b: *std.Build) void {
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const test_step = b.step("test", "Test it");
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b.default_step = test_step;
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add(b, test_step, .Debug);
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add(b, test_step, .ReleaseFast);
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add(b, test_step, .ReleaseSmall);
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add(b, test_step, .ReleaseSafe);
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}
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fn add(b: *std.Build, test_step: *std.Build.Step, optimize: std.builtin.OptimizeMode) void {
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const lib = b.addSharedLibrary(.{
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.name = "bootstrap",
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.optimize = optimize,
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.target = .{ .os_tag = .macos },
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});
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lib.addCSourceFile("bootstrap.c", &.{});
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lib.linkLibC();
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lib.linker_allow_shlib_undefined = true;
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const exe = b.addExecutable(.{
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.name = "main",
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.optimize = optimize,
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.target = .{ .os_tag = .macos },
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});
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exe.addCSourceFile("main.c", &.{});
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exe.linkLibrary(lib);
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exe.linkLibC();
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exe.entry_symbol_name = "_bootstrap";
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exe.forceUndefinedSymbol("_my_main");
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const check_exe = exe.checkObject();
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check_exe.checkStart("segname __TEXT");
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check_exe.checkNext("vmaddr {text_vmaddr}");
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check_exe.checkStart("sectname __stubs");
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check_exe.checkNext("addr {stubs_vmaddr}");
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check_exe.checkStart("cmd MAIN");
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check_exe.checkNext("entryoff {entryoff}");
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check_exe.checkComputeCompare("text_vmaddr entryoff +", .{
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.op = .eq,
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.value = .{ .variable = "stubs_vmaddr" }, // The entrypoint should be a synthetic stub
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});
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const run = check_exe.runAndCompare();
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run.expectStdOutEqual("Hello!\n");
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test_step.dependOn(&run.step);
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}
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