Re-enable profiling tests on M1/14.4 when using Xcode 15.3. (#322)

test/profiling.jl

@@ -1,25 +1,37 @@
 @testset "profiling" begin
 
-if MTL.is_m1(current_device()) && macos_version() >= v"14.4"
-@warn "Skipping profiling tests because of an M1-related bug on macOS 14.4"
+# determine if we can even run these tests
+run_tests = false
+if parse(Bool, get(ENV, "CI", "false"))
+    @warn "Skipping profiling tests on CI due to sandboxing issues"
+elseif !success(`xctrace version`)
+    @warn "Skipping profiling tests because xctrace is not available; please install Xcode first"
 else
+    version_output = chomp(read(`xctrace version`, String))
+    m = match(r"xctrace version (\d+).(\d+)", version_output)
+    if m === nothing
+        error("Could not parse xctrace version output:\n$version_output")
+    else
+        xcode_version = VersionNumber(parse(Int, m.captures[1]), parse(Int, m.captures[2]))
+        if MTL.is_m1(current_device()) && macos_version() >= v"14.4" && xcode_version < v"15.3"
+            @warn "Skipping profiling tests because of an M1-related bug on macOS 14.4 and Xcode < 15.3; please upgrade Xcode first"
+        else
+            run_tests = true
+        end
+    end
+end
 
+if run_tests
 mktempdir() do tmpdir
 cd(tmpdir) do
 
-if parse(Bool, get(ENV, "CI", "false"))
-@warn "Skipping profiling tests on CI due to sandboxing issues"
-else
-
 @testset "macro" begin
     Metal.@profile identity(nothing)
     @test isdir("julia_1.trace")
 end
 
 end
-
-end
-
 end
 end
+
 end