[llvm-bugs] [Bug 38953] New: clang-format breaks code by inserting spaces inside macro calls

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38953

            Bug ID: 38953
           Summary: clang-format breaks code by inserting spaces inside
                    macro calls
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ignat.loskutov at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

$ cat test.c
#include <stdio.h>

#define AS_STRING(x) #x

int main() {
    puts(AS_STRING(string-with-minus));
}
$ gcc test.c && ./a.out
string-with-minus
$ clang-format-7 -i test.c && gcc test.c && ./a.out
string - with - minus
$ cat test.c
#include <stdio.h>

#define AS_STRING(x) #x

int main() { puts(AS_STRING(string - with - minus)); }
$ lsb_release -d
Description:    Ubuntu 18.04.1 LTS
$ dpkg-query --showformat='${Version}\n' --show clang-format-7
1:7~svn323616-1

The code changed its behavior after formatting because some whitespace was
added inside a macro call.

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