| Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 1 | #ifndef _GL_WARN_ON_USE |
| 2 | |
| 3 | # if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) |
| 4 | /* A compiler attribute is available in gcc versions 4.3.0 and later. */ |
| 5 | # define _GL_WARN_ON_USE(function, message) \ |
| 6 | extern __typeof__ (function) function __attribute__ ((__warning__ (message))) |
| 7 | # elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING |
| 8 | /* Verify the existence of the function. */ |
| 9 | # define _GL_WARN_ON_USE(function, message) \ |
| 10 | extern __typeof__ (function) function |
| 11 | # else /* Unsupported. */ |
| 12 | # define _GL_WARN_ON_USE(function, message) \ |
| 13 | _GL_WARN_EXTERN_C int _gl_warn_on_use |
| 14 | # endif |
| 15 | #endif |
| 16 | |
| 17 | /* _GL_WARN_ON_USE_CXX (function, rettype, parameters_and_attributes, "string") |
| 18 | is like _GL_WARN_ON_USE (function, "string"), except that the function is |
| 19 | declared with the given prototype, consisting of return type, parameters, |
| 20 | and attributes. |
| 21 | This variant is useful for overloaded functions in C++. _GL_WARN_ON_USE does |
| 22 | not work in this case. */ |
| 23 | #ifndef _GL_WARN_ON_USE_CXX |
| 24 | # if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) |
| 25 | # define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \ |
| 26 | extern rettype function parameters_and_attributes \ |
| 27 | __attribute__ ((__warning__ (msg))) |
| 28 | # elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING |
| 29 | /* Verify the existence of the function. */ |
| 30 | # define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \ |
| 31 | extern rettype function parameters_and_attributes |
| 32 | # else /* Unsupported. */ |
| 33 | # define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \ |
| 34 | _GL_WARN_EXTERN_C int _gl_warn_on_use |
| 35 | # endif |
| 36 | #endif |
| 37 | |
| 38 | /* _GL_WARN_EXTERN_C declaration; |
| 39 | performs the declaration with C linkage. */ |
| 40 | #ifndef _GL_WARN_EXTERN_C |
| 41 | # if defined __cplusplus |
| 42 | # define _GL_WARN_EXTERN_C extern "C" |
| 43 | # else |
| 44 | # define _GL_WARN_EXTERN_C extern |
| 45 | # endif |
| 46 | #endif |