stage2: use std.debug.Trace only when explicitly enabled

Because it bumps up the stack space requirements, which is making a test
case fail on aarch64 drone CI.

1 files changed, 3 insertions, 0 deletions

diff --git a/build.zig b/build.zig
index 3ce7cc24c2..0afbe9171a 100644
--- a/build.zig
+++ b/build.zig
@@ -131,6 +131,7 @@ pub fn build(b: *Builder) !void {
     const link_libc = b.option(bool, "force-link-libc", "Force self-hosted compiler to link libc") orelse enable_llvm;
     const strip = b.option(bool, "strip", "Omit debug information") orelse false;
     const use_zig0 = b.option(bool, "zig0", "Bootstrap using zig0") orelse false;
+    const value_tracing = b.option(bool, "value-tracing", "Enable extra state tracking to help troubleshoot bugs in the compiler (using the std.debug.Trace API)") orelse false;
 
     const mem_leak_frames: u32 = b.option(u32, "mem-leak-frames", "How many stack frames to print when a memory leak occurs. Tests get 2x this amount.") orelse blk: {
         if (strip) break :blk @as(u32, 0);
@@ -353,6 +354,7 @@ pub fn build(b: *Builder) !void {
     exe_options.addOption(bool, "enable_tracy", tracy != null);
     exe_options.addOption(bool, "enable_tracy_callstack", tracy_callstack);
     exe_options.addOption(bool, "enable_tracy_allocation", tracy_allocation);
+    exe_options.addOption(bool, "value_tracing", value_tracing);
     exe_options.addOption(bool, "is_stage1", is_stage1);
     exe_options.addOption(bool, "omit_stage2", omit_stage2);
     if (tracy) |tracy_path| {
@@ -402,6 +404,7 @@ pub fn build(b: *Builder) !void {
     test_cases_options.addOption(bool, "enable_rosetta", b.enable_rosetta);
     test_cases_options.addOption(bool, "enable_darling", b.enable_darling);
     test_cases_options.addOption(u32, "mem_leak_frames", mem_leak_frames * 2);
+    test_cases_options.addOption(bool, "value_tracing", value_tracing);
     test_cases_options.addOption(?[]const u8, "glibc_runtimes_dir", b.glibc_runtimes_dir);
     test_cases_options.addOption([:0]const u8, "version", try b.allocator.dupeZ(u8, version));
     test_cases_options.addOption(std.SemanticVersion, "semver", semver);