POSIX requires RTLD_LOCAL to be defined in <dlfcn.h>[1]. While our dlopen() does nothing with its second argument, portable software can rightfully expect the definition to exist alongside the other RTLD_* macros.
So why 0? POSIX states wrt dlopen()[2]: > If neither RTLD_GLOBAL nor RTLD_LOCAL are specified, then the default > behavior is unspecified. On Linux, RTLD_LOCAL is the default behaviour[3], and hence is defined as 0[4], therefore I have done the same here. Patch attached. Since this doesn't actually do anything, I wasn't sure if I should bump CYGWIN_VERSION_API_MINOR for this or not; I can certainly do so before committing if desired. Yaakov [1] http://www.opengroup.org/onlinepubs/9699919799/basedefs/dlfcn.h.html [2] http://www.opengroup.org/onlinepubs/9699919799/functions/dlopen.html [3] http://linux.die.net/man/3/dlopen [4] http://sourceware.org/git/?p=glibc.git;a=blob;f=bits/dlfcn.h
2010-08-06 Yaakov Selkowitz <yselkow...@users.sourceforge.net> * include/dlfcn.h (RTLD_LOCAL): Define. Index: include/dlfcn.h =================================================================== RCS file: /cvs/src/src/winsup/cygwin/include/dlfcn.h,v retrieving revision 1.3 diff -u -r1.3 dlfcn.h --- include/dlfcn.h 14 Sep 2004 08:29:12 -0000 1.3 +++ include/dlfcn.h 7 Aug 2010 01:22:37 -0000 @@ -31,6 +31,7 @@ #define RTLD_DEFAULT NULL /* valid values for mode argument to dlopen */ +#define RTLD_LOCAL 0 /* symbols in this dlopen'ed obj are not visible to other dlopen'ed objs */ #define RTLD_LAZY 1 /* lazy function call binding */ #define RTLD_NOW 2 /* immediate function call binding */ #define RTLD_GLOBAL 4 /* symbols in this dlopen'ed obj are visible to other dlopen'ed objs */
