README.md

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plugins_pp.h

#if !BOOST_PP_IS_ITERATING
   #include <boost/preprocessor/iteration/iterate.hpp>
   #include <boost/preprocessor/seq/seq.hpp>
   #include <boost/preprocessor/seq/size.hpp>
   #include <boost/preprocessor/facilities/expand.hpp>
   #include <boost/preprocessor/stringize.hpp>

   #define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PP_SEQ_SIZE(PLUGINS), "plugins_pp.h"))
   #include BOOST_PP_ITERATE()
#else

#ifdef PLUGINS_INCLUDE
   #include BOOST_PP_STRINGIZE(BOOST_PP_SEQ_ELEM(BOOST_PP_EXPAND(BOOST_PP_DEC(BOOST_PP_ITERATION())), PLUGINS).h)
#else
   BOOST_PP_CAT(BOOST_PP_SEQ_ELEM(BOOST_PP_EXPAND(BOOST_PP_DEC(BOOST_PP_ITERATION())), PLUGINS), _init)();
#endif

#endif

test.c

#define PLUGINS (test1)(test2)(test3)

#include <stdio.h>

#define PLUGINS_INCLUDE
#include "plugins_pp.h"
#undef PLUGINS_INCLUDE


int main() {
	#include "plugins_pp.h"
}

test1.h

void test1_init() {
	printf("test1 init\n");
}

test2.h

void test2_init() {
	printf("test2 init\n");
}

test3.h

void test3_init() {
	printf("test3 init\n");
}