[llvm-branch-commits] [clang] 431af6d - opencl: Ensure printf symbol is not mangled. (#150210)

[Tobias Hieta via llvm-branch-commits]

Author: Felix Weiglhofer
Date: 2025-07-29T09:55:29+02:00
New Revision: 431af6d04c9da4cab060f429bade6ed341d080e5

URL: https://github.com/llvm/llvm-project/commit/431af6d04c9da4cab060f429bade6ed341d080e5
DIFF: https://github.com/llvm/llvm-project/commit/431af6d04c9da4cab060f429bade6ed341d080e5.diff

LOG: opencl: Ensure printf symbol is not mangled. (#150210)

Fixes #122453.

(cherry picked from commit a22d010002baf761f84d0a8fa5fcaaf6f3b1455f)

Added: 
    

Modified: 
    clang/lib/Headers/opencl-c-base.h

Removed: 
    


################################################################################
diff  --git a/clang/lib/Headers/opencl-c-base.h b/clang/lib/Headers/opencl-c-base.h
index 2b7f5043e09e4..6206a347852be 100644
--- a/clang/lib/Headers/opencl-c-base.h
+++ b/clang/lib/Headers/opencl-c-base.h
@@ -697,7 +697,16 @@ template <typename _Tp> struct __remove_address_space<__constant _Tp> {
 #if defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)
 // OpenCL v1.2 s6.12.13, v2.0 s6.13.13 - printf
 
-int printf(__constant const char* st, ...) __attribute__((format(printf, 1, 2)));
+#ifdef __OPENCL_CPP_VERSION__
+#define CLINKAGE extern "C"
+#else
+#define CLINKAGE
+#endif
+
+CLINKAGE int printf(__constant const char *st, ...)
+    __attribute__((format(printf, 1, 2)));
+
+#undef CLINKAGE
 #endif
 
 #ifdef cl_intel_device_side_avc_motion_estimation