bugprone-suspicious-missing-comma¶
String literals placed side-by-side are concatenated at translation phase 6 (after the preprocessor). This feature is used to represent long string literal on multiple lines.
For instance, the following declarations are equivalent:
const char* A[] = "This is a test";
const char* B[] = "This" " is a "    "test";
A common mistake done by programmers is to forget a comma between two string literals in an array initializer list.
const char* Test[] = {
  "line 1",
  "line 2"     // Missing comma!
  "line 3",
  "line 4",
  "line 5"
};
The array contains the string “line 2line3” at offset 1 (i.e. Test[1]). Clang won’t generate warnings at compile time.
This check may warn incorrectly on cases like:
const char* SupportedFormat[] = {
  "Error %s",
  "Code " PRIu64,   // May warn here.
  "Warning %s",
};
Options¶
- 
SizeThreshold¶
- An unsigned integer specifying the minimum size of a string literal to be considered by the check. Default is 5U. 
- 
RatioThreshold¶
- A string specifying the maximum threshold ratio [0, 1.0] of suspicious string literals to be considered. Default is “.2”. 
- 
MaxConcatenatedTokens¶
- An unsigned integer specifying the maximum number of concatenated tokens. Default is 5U.