isblank is redefined as a macro in pjlib/include/pj/compat/ctype.h. Since gcc 5, the handling of the builtin isblank functions have changed in C++, see https://gcc.gnu.org/gcc-5/changes.html#libstdcxx
I'm not sure of the proper way to fix this in all cases (C, C++, old & new systems), but the following patch applied to pjproject allowed ring-daemon to compile:
isblankis redefined as a macro inpjlib/include/pj/compat/ctype.h. Since gcc 5, the handling of the builtinisblankfunctions have changed in C++, see https://gcc.gnu.org/gcc-5/changes.html#libstdcxxAs a result, some applications including pjproject may fail to compile, see for instance https://projects.savoirfairelinux.com/issues/73855
I'm not sure of the proper way to fix this in all cases (C, C++, old & new systems), but the following patch applied to pjproject allowed ring-daemon to compile:
--- pjproject/pjlib/include/pj/compat/ctype.h.orig 2015-05-25 22:45:17.862889506 +0200 +++ pjproject/pjlib/include/pj/compat/ctype.h 2015-05-25 22:54:41.889520387 +0200 @@ -39,11 +39,12 @@ # define isxdigit(c) (isdigit(c) || (tolower(c)>='a'&&tolower(c)<='f')) # define tolower(c) (((c) >= 'A' && (c) <= 'Z') ? (c)+('a'-'A') : (c)) # define toupper(c) (((c) >= 'a' && (c) <= 'z') ? (c)-('a'-'A') : (c)) -#endif #ifndef isblank # define isblank(c) (c==' ' || c=='\t') #endif +#endif + #endif /* __PJ_COMPAT_CTYPE_H__ */