https://llvm.org/bugs/show_bug.cgi?id=27622
Bug ID: 27622
Summary: -Wbackslash-newline-escape printed twice, but only
when other warning is present
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: doug.cole...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The -Wbackslash-newline-escape is printed twice, but only when other warnings
are present. Case 1) demonstrates the bug, cases 2) and 3) are each
warning/error by themselves, where the warning is not erroneously printed
twice.
1) This program demonstrates the bug. Notice that the ``hello.c:1:19`` warning
is displayed twice. (There's a space character after the \, not the text
[space])
Program```
#include <stdio.h\[space]
"
```
Output```
ergmac:~ erg$ clang hello.c
hello.c:1:19: warning: backslash and newline separated by space
[-Wbackslash-newline-escape]
#include <stdio.h\
^
hello.c:1:19: warning: backslash and newline separated by space
[-Wbackslash-newline-escape]
hello.c:1:18: warning: missing terminating '"' character [-Winvalid-pp-token]
#include <stdio.h\
^
hello.c:2:2: error: expected "FILENAME" or <FILENAME>
"
^
3 warnings and 1 error generated.
```
2) The same program with the correct terminator character only displays the
warning once. (No space after the \)
Program```
ergmac:~ erg$ cat hello.c
#include <stdio.h\
>
```
Output```
ergmac:~ erg$ clang hello.c
hello.c:1:19: warning: backslash and newline separated by space
[-Wbackslash-newline-escape]
#include <stdio.h\
^
1 warning generated.
```
3) The same program without the space but with the wrong terminator.
Program```
ergmac:~ erg$ cat hello.c
#include <stdio.h\
"
```
Output```
ergmac:~ erg$ clang hello.c
hello.c:1:18: warning: missing terminating '"' character [-Winvalid-pp-token]
#include <stdio.h\
^
hello.c:2:2: error: expected "FILENAME" or <FILENAME>
"
^
1 warning and 1 error generated.
```
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