It seems like it caused a bug:
https://bugs.llvm.org/show_bug.cgi?id=39486
From: cfe-commits on behalf of Matt
Arsenault via cfe-commits
Sent: 03 October 2018 03:01
To: cfe-commits@lists.llvm.org
Subject: r343653 - OpenCL: Mark printf format string argument
Author: arsenm
Date: Tue Oct 2 19:01:19 2018
New Revision: 343653
URL: http://llvm.org/viewvc/llvm-project?rev=343653=rev
Log:
OpenCL: Mark printf format string argument
Fixes not warning on format string errors.
Added:
cfe/trunk/test/SemaOpenCL/printf-format-string-warnings.cl
Modified:
cfe/trunk/lib/Headers/opencl-c.h
Modified: cfe/trunk/lib/Headers/opencl-c.h
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Headers/opencl-c.h?rev=343653=343652=343653=diff
==
--- cfe/trunk/lib/Headers/opencl-c.h (original)
+++ cfe/trunk/lib/Headers/opencl-c.h Tue Oct 2 19:01:19 2018
@@ -14462,7 +14462,7 @@ half16 __ovld __cnfn shuffle2(half16 x,
#if __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, ...);
+int printf(__constant const char* st, ...) __attribute__((format(printf, 1,
2)));
#endif
// OpenCL v1.1 s6.11.3, v1.2 s6.12.14, v2.0 s6.13.14 - Image Read and Write
Functions
Added: cfe/trunk/test/SemaOpenCL/printf-format-string-warnings.cl
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaOpenCL/printf-format-string-warnings.cl?rev=343653=auto
==
--- cfe/trunk/test/SemaOpenCL/printf-format-string-warnings.cl (added)
+++ cfe/trunk/test/SemaOpenCL/printf-format-string-warnings.cl Tue Oct 2
19:01:19 2018
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=CL2.0
-finclude-default-header
+
+// Make sure warnings are produced based on printf format strings.
+
+
+kernel void format_string_warnings(__constant char* arg) {
+
+ printf("%d", arg); // expected-warning {{format specifies type 'int' but the
argument has type '__constant char *'}}
+
+ printf("not enough arguments %d %d", 4); // expected-warning {{more '%'
conversions than data arguments}}
+
+ printf("too many arguments", 4); // expected-warning {{data argument not
used by format string}}
+}
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