Error "token is not a valid binary operator in a preprocessor subexpression"

Question

if I build and run a project, basically a stub generated by the Qt framework on Mac OS 10.6, I get this error output:

/Users/home/Qt5.0.1/5.0.1/clang_64/include/QtCore/qisenum.h:53: Error:token is not a valid binary operator in a preprocessor subexpression
#    if __has_extension(is_enum)
    ~~~~~~~~~~~~~~~^

I can´t find a solution to this, although I read that other Mac users seem to have the same problem. Anyone knows how to solve this?

Maybe the macro `__has_extension` is not implemented for `is_enum` or you need to find the definition. Try `grep`. — Thomas Matthews, Feb 02 '13 at 18:52
thanks a lot for the hint, but is it really reasonable to hack arround in the code of the QT Core? — 最白目, Feb 05 '13 at 18:30

score 2 · Accepted Answer · edited Jun 14 '15 at 16:14

2

I have found the solution. Just copy the latest qisenum.h file from here and replace it in clang_64/include/QtCore folder in your Qt creator installation, it will work fine.

edited Jun 14 '15 at 16:14

p.i.g.

2,815
2
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answered Feb 28 '13 at 14:24

get

36
1

score 1 · Answer 2 · edited Jun 14 '15 at 16:14

1

This issue is resolved in this forum post.

It is basically an issue with your version of clang

edited Jun 14 '15 at 16:14

p.i.g.

2,815
2
24
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answered Feb 27 '13 at 16:37

fjardon

7,921
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score 1 · Answer 3 · answered Nov 26 '15 at 01:14

#    if __has_extension(is_enum)
         ~~~~~~~~~~~~~~~^

That's a Clang language extension called feature checking macros. They've been around a long time for Clang. GCC provided them starting at GCC 5.0, IIRC.

__has_extension can be tested as a preprocessor macro. So you test for the presence of the macro first, and then you test for the feature:

#if defined(__has_extension)
# if __has_extension(is_enum)
   ...
# endif
#endif

__has_extension(is_enum) must be on a separate line.

It works for include files, too. From the Crypto++ project an rdrand.cpp file:

# include <immintrin.h> // rdrand, MSC, ICC, and GCC
# if defined(__has_include)
#  if __has_include(<x86intrin.h>)
#   include <x86intrin.h> // rdseed for some compilers, like GCC
#  endif
# endif

score 1 · Answer 4 · answered Mar 22 '16 at 16:40

1

In my case the reason of the same error was that Preprocessor macro name in Target Build Settings contained hyphen sign '-', something like that TEST-DEBUG=1.

Xcode build configuration names with hyphens ('-') cause pods build failures

answered Mar 22 '16 at 16:40

d.rozumeenko

126
2
3

score 0 · Answer 5 · answered Jun 08 '22 at 01:31

My case is:

#define USE_LIBICONV 1 # xxxxxx

Error

Token is not a valid binary operator in a preprocessor subexpression

Solution:

remove typo comments after #define

=> change # to //

#define USE_LIBICONV 1 // xxxxxx

then can use macro normally:

#if USE_LIBICONV
...
#endif

Error "token is not a valid binary operator in a preprocessor subexpression"

5 Answers5

My case is:

Error

Solution:

Linked