Q&A
"/Users/kosuke/Workspace/diary-system/vendor/bundle/ruby/2.5.0/extensions/x86_64-darwin-22/2.5.0/ruby-filemagic-0.7.2/mkmf.log" の中身は以下のとおりです。
```
have_library: checking for -lgnurx... -------------------- no
"clang -o conftest -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/x86_64-darwin22 -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/ruby/backward -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0 -I. -I/opt/local/include -I/usr/local/include -I/usr/include -I/opt/homebrew/opt/libmagic/include -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include -I/opt/homebrew/opt/imagemagick@6/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -Wno-error=implicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/local/lib -L/usr/local/lib -L/usr/lib -L/opt/homebrew/opt/libmagic/lib -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/homebrew/opt/imagemagick@6/lib -fstack-protector -lruby.2.5.1 -lpthread -ldl -lobjc "
ld: warning: search path '/opt/local/lib' not found
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */
"clang -o conftest -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/x86_64-darwin22 -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/ruby/backward -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0 -I. -I/opt/local/include -I/usr/local/include -I/usr/include -I/opt/homebrew/opt/libmagic/include -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include -I/opt/homebrew/opt/imagemagick@6/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -Wno-error=implicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/local/lib -L/usr/local/lib -L/usr/lib -L/opt/homebrew/opt/libmagic/lib -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/homebrew/opt/imagemagick@6/lib -fstack-protector -lruby.2.5.1 -lgnurx -lpthread -ldl -lobjc "
ld: warning: search path '/opt/local/lib' not found
ld: library 'gnurx' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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:
14: int t(void) { ; return 0; }
/* end */
--------------------
have_library: checking for magic_open() in -lmagic... -------------------- no
"clang -o conftest -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/x86_64-darwin22 -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/ruby/backward -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0 -I. -I/opt/local/include -I/usr/local/include -I/usr/include -I/opt/homebrew/opt/libmagic/include -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include -I/opt/homebrew/opt/imagemagick@6/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -Wno-error=implicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/local/lib -L/usr/local/lib -L/usr/lib -L/opt/homebrew/opt/libmagic/lib -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/homebrew/opt/imagemagick@6/lib -fstack-protector -lruby.2.5.1 -lmagic -lpthread -ldl -lobjc "
conftest.c:13:57: error: use of undeclared identifier 'magic_open'
int t(void) { void ((*volatile p)()); p = (void ((*)()))magic_open; return !p; }
^
1 error generated.
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 ((*)()))magic_open; return !p; }
/* end */
"clang -o conftest -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/x86_64-darwin22 -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0/ruby/backward -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include/ruby-2.5.0 -I. -I/opt/local/include -I/usr/local/include -I/usr/include -I/opt/homebrew/opt/libmagic/include -I/Users/kosuke/.asdf/installs/ruby/2.5.1/include -I/opt/homebrew/opt/imagemagick@6/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -Wno-error=implicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/local/lib -L/usr/local/lib -L/usr/lib -L/opt/homebrew/opt/libmagic/lib -L. -L/Users/kosuke/.asdf/installs/ruby/2.5.1/lib -L/opt/homebrew/opt/imagemagick@6/lib -fstack-protector -lruby.2.5.1 -lmagic -lpthread -ldl -lobjc "
ld: warning: search path '/opt/local/lib' not found
ld: warning: ignoring file '/opt/homebrew/Cellar/libmagic/5.45/lib/libmagic.1.dylib': found architecture 'arm64', required architecture 'x86_64'
ld: Undefined symbols:
_magic_open, referenced from:
_t in conftest-ad4b24.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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: extern void magic_open();
14: int t(void) { magic_open(); return 0; }
/* end */
--------------------
```
自己解決
