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glibc_runtime_check.c is a simple test case that exercises glibc functions that might smoke out linking problems with Zig's C compiler. The build.zig compiles it against a variety of glibc versions. Also document and test glibc v2.2.5 (from 2002) as the oldest working glibc target for C binaries.
221 lines
8.3 KiB
Zig
221 lines
8.3 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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// To run executables linked against a specific glibc version, the
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// run-time glibc version needs to be new enough. Check the host's glibc
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// version. Note that this does not allow for translation/vm/emulation
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// services to run these tests.
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const running_glibc_ver: ?std.SemanticVersion = switch (builtin.os.tag) {
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.linux => builtin.os.version_range.linux.glibc,
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else => null,
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};
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pub fn build(b: *std.Build) void {
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const test_step = b.step("test", "Test");
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b.default_step = test_step;
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for ([_][]const u8{ "aarch64-linux-gnu.2.27", "aarch64-linux-gnu.2.34" }) |t| {
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const exe = b.addExecutable(.{
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.name = t,
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.target = b.resolveTargetQuery(std.Target.Query.parse(
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.{ .arch_os_abi = t },
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) catch unreachable),
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});
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exe.addCSourceFile(.{ .file = b.path("main.c") });
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exe.linkLibC();
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// TODO: actually test the output
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_ = exe.getEmittedBin();
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test_step.dependOn(&exe.step);
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}
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// Build & run a C test case against a sampling of supported glibc versions
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for ([_][]const u8{
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// "native-linux-gnu.2.0", // fails with a pile of missing symbols.
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"native-linux-gnu.2.2.5",
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"native-linux-gnu.2.4",
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"native-linux-gnu.2.12",
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"native-linux-gnu.2.16",
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"native-linux-gnu.2.22",
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"native-linux-gnu.2.28",
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"native-linux-gnu.2.33",
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"native-linux-gnu.2.38",
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"native-linux-gnu",
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}) |t| {
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const target = b.resolveTargetQuery(std.Target.Query.parse(
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.{ .arch_os_abi = t },
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) catch unreachable);
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const glibc_ver = target.result.os.version_range.linux.glibc;
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const exe = b.addExecutable(.{
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.name = t,
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.target = target,
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});
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exe.addCSourceFile(.{ .file = b.path("glibc_runtime_check.c") });
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exe.linkLibC();
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// Only try running the test if the host glibc is known to be good enough. Ideally, the Zig
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// test runner would be able to check this, but see https://github.com/ziglang/zig/pull/17702#issuecomment-1831310453
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if (running_glibc_ver) |running_ver| {
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if (glibc_ver.order(running_ver) == .lt) {
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const run_cmd = b.addRunArtifact(exe);
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run_cmd.skip_foreign_checks = true;
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run_cmd.expectExitCode(0);
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test_step.dependOn(&run_cmd.step);
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}
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}
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const check = exe.checkObject();
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// __errno_location is always a dynamically linked symbol
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __errno_location");
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// before v2.32 fstat redirects through __fxstat, afterwards its a
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// normal dynamic symbol
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check.checkInDynamicSymtab();
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if (glibc_ver.order(.{ .major = 2, .minor = 32, .patch = 0 }) == .lt) {
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __fxstat");
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check.checkInSymtab();
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check.checkContains("FUNC LOCAL HIDDEN fstat");
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} else {
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT fstat");
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check.checkInSymtab();
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check.checkNotPresent("__fxstat");
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}
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// before v2.26 reallocarray is not supported
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check.checkInDynamicSymtab();
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if (glibc_ver.order(.{ .major = 2, .minor = 26, .patch = 0 }) == .lt) {
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check.checkNotPresent("reallocarray");
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} else {
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT reallocarray");
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}
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// before v2.38 strlcpy is not supported
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check.checkInDynamicSymtab();
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if (glibc_ver.order(.{ .major = 2, .minor = 38, .patch = 0 }) == .lt) {
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check.checkNotPresent("strlcpy");
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} else {
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT strlcpy");
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}
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// v2.16 introduced getauxval()
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check.checkInDynamicSymtab();
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if (glibc_ver.order(.{ .major = 2, .minor = 16, .patch = 0 }) == .lt) {
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check.checkNotPresent("getauxval");
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} else {
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT getauxval");
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}
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// Always have dynamic "exit", "pow", and "powf" references
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT exit");
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT pow");
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT powf");
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// An atexit local symbol is defined, and depends on undefined dynamic
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// __cxa_atexit.
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check.checkInSymtab();
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check.checkContains("FUNC LOCAL HIDDEN atexit");
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __cxa_atexit");
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test_step.dependOn(&check.step);
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}
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// Build & run a Zig test case against a sampling of supported glibc versions
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for ([_][]const u8{
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"native-linux-gnu.2.17", // Currently oldest supported, see #17769
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"native-linux-gnu.2.23",
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"native-linux-gnu.2.28",
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"native-linux-gnu.2.33",
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"native-linux-gnu.2.38",
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"native-linux-gnu",
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}) |t| {
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const target = b.resolveTargetQuery(std.Target.Query.parse(
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.{ .arch_os_abi = t },
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) catch unreachable);
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const glibc_ver = target.result.os.version_range.linux.glibc;
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const exe = b.addExecutable(.{
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.name = t,
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.root_source_file = b.path("glibc_runtime_check.zig"),
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.target = target,
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});
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exe.linkLibC();
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// Only try running the test if the host glibc is known to be good enough. Ideally, the Zig
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// test runner would be able to check this, but see https://github.com/ziglang/zig/pull/17702#issuecomment-1831310453
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if (running_glibc_ver) |running_ver| {
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if (glibc_ver.order(running_ver) == .lt) {
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const run_cmd = b.addRunArtifact(exe);
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run_cmd.skip_foreign_checks = true;
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run_cmd.expectExitCode(0);
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test_step.dependOn(&run_cmd.step);
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}
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}
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const check = exe.checkObject();
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// __errno_location is always a dynamically linked symbol
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __errno_location");
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// before v2.32 fstatat redirects through __fxstatat, afterwards its a
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// normal dynamic symbol
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if (glibc_ver.order(.{ .major = 2, .minor = 32, .patch = 0 }) == .lt) {
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __fxstatat");
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check.checkInSymtab();
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check.checkContains("FUNC LOCAL HIDDEN fstatat");
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} else {
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT fstatat");
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check.checkInSymtab();
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check.checkNotPresent("FUNC LOCAL HIDDEN fstatat");
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}
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// before v2.26 reallocarray is not supported
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if (glibc_ver.order(.{ .major = 2, .minor = 26, .patch = 0 }) == .lt) {
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check.checkInDynamicSymtab();
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check.checkNotPresent("reallocarray");
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} else {
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT reallocarray");
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}
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// before v2.38 strlcpy is not supported
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if (glibc_ver.order(.{ .major = 2, .minor = 38, .patch = 0 }) == .lt) {
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check.checkInDynamicSymtab();
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check.checkNotPresent("strlcpy");
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} else {
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT strlcpy");
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}
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// v2.16 introduced getauxval(), so always present
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT getauxval");
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// Always have a dynamic "exit" reference
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT exit");
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// An atexit local symbol is defined, and depends on undefined dynamic
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// __cxa_atexit.
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check.checkInSymtab();
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check.checkContains("FUNC LOCAL HIDDEN atexit");
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check.checkInDynamicSymtab();
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check.checkExact("0 0 UND FUNC GLOBAL DEFAULT __cxa_atexit");
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test_step.dependOn(&check.step);
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}
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}
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