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 47
