build-exe: allow combination of -fno-emit-bin and --verbose-air

Currently, `zig build-exe -fno-emit-bin --verbose-air src/main.zig`
results in no output at all. With this refactor, it dumps AIR
and then exits without invoking LLVM, as expected

1 files changed, 11 insertions, 4 deletions

diff --git a/src/Module.zig b/src/Module.zig
index c63fe43158..3ae6c48edd 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -4274,11 +4274,14 @@ pub fn ensureFuncBodyAnalyzed(mod: *Module, func: *Fn) SemaError!void {
 
             const comp = mod.comp;
 
-            if (comp.bin_file.options.emit == null and
+            const no_bin_file = (comp.bin_file.options.emit == null and
                 comp.emit_asm == null and
                 comp.emit_llvm_ir == null and
-                comp.emit_llvm_bc == null)
-            {
+                comp.emit_llvm_bc == null);
+
+            const dump_air = builtin.mode == .Debug and comp.verbose_air;
+
+            if (no_bin_file and !dump_air) {
                 return;
             }
 
@@ -4286,7 +4289,7 @@ pub fn ensureFuncBodyAnalyzed(mod: *Module, func: *Fn) SemaError!void {
             var liveness = try Liveness.analyze(gpa, air);
             defer liveness.deinit(gpa);
 
-            if (builtin.mode == .Debug and comp.verbose_air) {
+            if (dump_air) {
                 const fqn = try decl.getFullyQualifiedName(mod);
                 defer mod.gpa.free(fqn);
 
@@ -4295,6 +4298,10 @@ pub fn ensureFuncBodyAnalyzed(mod: *Module, func: *Fn) SemaError!void {
                 std.debug.print("# End Function AIR: {s}\n\n", .{fqn});
             }
 
+            if (no_bin_file) {
+                return;
+            }
+
             comp.bin_file.updateFunc(mod, func, air, liveness) catch |err| switch (err) {
                 error.OutOfMemory => return error.OutOfMemory,
                 error.AnalysisFail => {