'RTLD_NEXT' undeclared

c linux include cygwin undefined
neuromancer picture neuromancer · Nov 22, 2009 · Viewed 21.2k times · Source

I'm trying to compile a C program but I get the error 'RTLD_NEXT' undeclared. I think this is supposed to be defined in dlfcn.h which the c program includes, but when I looked inside dlfcn.h there is no RTLD_NEXT.

How do I fix this?

Answer

bmargulies picture bmargulies · Nov 22, 2009

The issue here is that RTLD_NEXT is not defined by the posix standard . So the GNU people don't enable it unless you #define _GNU_SOURCE or -D_GNU_SOURCE.

Other relevant pieces of POSIX are dlfcn.h and dlsym.h. Interestingly, the later mentions RTLD_NEXT. Apparently, the GNU people are a bit confused about what is an extension and what is not.

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