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?
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.
According to man dlsym
it is #define _GNU_SOURCE
(just one leading underscore) before the dlfcn.h
is included. (RHEL6.1).
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