find_header: checking for yaml.h... -------------------- yes

"gcc -o conftest -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/x86_64-linux -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/ruby/backward -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0 -I. -DENABLE_PATH_CHECK=0   -g -O2 -fPIC conftest.c  -L. -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -lruby  -lm   -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */

"gcc -E -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/x86_64-linux -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/ruby/backward -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0 -I. -DENABLE_PATH_CHECK=0   -g -O2 -fPIC  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <yaml.h>
/* end */

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

find_library: checking for yaml_get_version() in -lyaml... -------------------- yes

"gcc -o conftest -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/x86_64-linux -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/ruby/backward -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0 -I. -DENABLE_PATH_CHECK=0   -g -O2 -fPIC conftest.c  -L. -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -lruby -lyaml  -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:14:57: error: ‘yaml_get_version’ undeclared (first use in this function)
   14 | int t(void) { void ((*volatile p)()); p = (void ((*)()))yaml_get_version; return !p; }
      |                                                         ^~~~~~~~~~~~~~~~
conftest.c:14:57: note: each undeclared identifier is reported only once for each function it appears in
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:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return !!argv[argc];
13: }
14: int t(void) { void ((*volatile p)()); p = (void ((*)()))yaml_get_version; return !p; }
/* end */

"gcc -o conftest -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/x86_64-linux -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0/ruby/backward -I/opt/hostedtoolcache/Ruby/2.7.8/x64/include/ruby-2.7.0 -I. -DENABLE_PATH_CHECK=0   -g -O2 -fPIC conftest.c  -L. -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -L/opt/hostedtoolcache/Ruby/2.7.8/x64/lib -lruby -lyaml  -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:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return !!argv[argc];
13: }
14: extern void yaml_get_version();
15: int t(void) { yaml_get_version(); return 0; }
/* end */

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