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fix libc++ exceptions for musl targets

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This reverts commit d31be31267.

The problem was happening due to an LLVM bug exposed by having LTO
enabled for libunwind. The simple workaround is to disable LTO for
libunwind. It can be re-enabled in the future when the upstream bug
is fixed.

See #12828
This commit is contained in:
Andrew Kelley 2022-09-13 11:38:14 -07:00
parent cdb40936bd
commit f9859c102d
2 changed files with 3 additions and 8 deletions
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3
src/libunwind.zig
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@ -109,7 +109,8 @@ pub fn buildStaticLib(comp: *Compilation) !void {
.want_tsan = false, .want_tsan = false,
.want_pic = comp.bin_file.options.pic, .want_pic = comp.bin_file.options.pic,
.want_pie = comp.bin_file.options.pie, .want_pie = comp.bin_file.options.pie,
.want_lto = comp.bin_file.options.lto, // Disable LTO to avoid https://github.com/llvm/llvm-project/issues/56825
.want_lto = false,
.function_sections = comp.bin_file.options.function_sections, .function_sections = comp.bin_file.options.function_sections,
.emit_h = null, .emit_h = null,
.strip = comp.compilerRtStrip(), .strip = comp.compilerRtStrip(),

8
test/standalone/c_compiler/build.zig
View file

@ -12,15 +12,9 @@ fn isRunnableTarget(t: CrossTarget) bool {
} }
pub fn build(b: *Builder) void { pub fn build(b: *Builder) void {
var mode = b.standardReleaseOptions(); const mode = b.standardReleaseOptions();
const target = b.standardTargetOptions(.{}); const target = b.standardTargetOptions(.{});
if (mode != .Debug and target.getAbi().isMusl()) {
// https://github.com/ziglang/zig/issues/12828
std.debug.print("warn: skipping musl libc++ test that regressed with LLVM 15\n", .{});
mode = .Debug;
}
const test_step = b.step("test", "Test the program"); const test_step = b.step("test", "Test the program");
const exe_c = b.addExecutable("test_c", null); const exe_c = b.addExecutable("test_c", null);