nixpkgs/pkgs/development/libraries/khronos-ocl-icd-loader/tracing.patch

diff --git a/loader/icd.h b/loader/icd.h
index 34751e9..01a33fd 100644
--- a/loader/icd.h
+++ b/loader/icd.h
@@ -123,7 +123,7 @@ void khrIcdContextPropertiesGetPlatform(
     cl_platform_id *outPlatform);
 
 // internal tracing macros
-#if 0
+#if 1
     #include <stdio.h>
     #define KHR_ICD_TRACE(...) \
     do \