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have_library: checking for main() in -lc... -------------------- yes

"gcc -o conftest -I/usr/include/x86_64-linux-gnu/ruby-2.5.0 -I/usr/include/ruby-2.5.0/ruby/backward -I/usr/include/ruby-2.5.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -fdebug-prefix-map=/build/ruby2.5-pRq5qf/ruby2.5-2.5.1=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC conftest.c  -L. -L/usr/lib/x86_64-linux-gnu -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby-2.5  -lpthread -lgmp -ldl -lcrypt -lm   -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */

"gcc -o conftest -I/usr/include/x86_64-linux-gnu/ruby-2.5.0 -I/usr/include/ruby-2.5.0/ruby/backward -I/usr/include/ruby-2.5.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -fdebug-prefix-map=/build/ruby2.5-pRq5qf/ruby2.5-2.5.1=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC conftest.c  -L. -L/usr/lib/x86_64-linux-gnu -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby-2.5 -lc  -lpthread -lgmp -ldl -lcrypt -lm   -lc"
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     printf("%p", &t);
 9:   }
10: 
11:   return 0;
12: }
13: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return !p; }
/* end */

--------------------

have_macro: checking for HAVE_RB_IO_T in rubyio.h... -------------------- yes

"gcc -I/usr/include/x86_64-linux-gnu/ruby-2.5.0 -I/usr/include/ruby-2.5.0/ruby/backward -I/usr/include/ruby-2.5.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -fdebug-prefix-map=/build/ruby2.5-pRq5qf/ruby2.5-2.5.1=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC   -c conftest.c"
In file included from conftest.c:3:0:
/usr/include/ruby-2.5.0/ruby/backward/rubyio.h:2:2: warning: #warning use "ruby/io.h" instead of "rubyio.h" [-Wcpp]
 #warning use "ruby/io.h" instead of "rubyio.h"
  ^~~~~~~
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <rubyio.h>
4: /*top*/
5: #ifndef HAVE_RB_IO_T
6: # error
7: |:/ === HAVE_RB_IO_T undefined === /:|
8: #endif
/* end */

--------------------

have_struct_member: checking for rb_io_t.fd in rubyio.h... -------------------- yes

"gcc -I/usr/include/x86_64-linux-gnu/ruby-2.5.0 -I/usr/include/ruby-2.5.0/ruby/backward -I/usr/include/ruby-2.5.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -g -O2 -fdebug-prefix-map=/build/ruby2.5-pRq5qf/ruby2.5-2.5.1=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC   -c conftest.c"
In file included from conftest.c:3:0:
/usr/include/ruby-2.5.0/ruby/backward/rubyio.h:2:2: warning: #warning use "ruby/io.h" instead of "rubyio.h" [-Wcpp]
 #warning use "ruby/io.h" instead of "rubyio.h"
  ^~~~~~~
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <rubyio.h>
 4: 
 5: /*top*/
 6: int s = (char *)&((rb_io_t*)0)->fd - (char *)0;
 7: int main(int argc, char **argv)
 8: {
 9:   return 0;
10: }
/* end */

--------------------