例外Dl.DL_error：未定义的符号：SDL_GetError

Question

所以，我想用Tsdl这里是我所做的：

• 我找不到SDL 2.0.5与apt-get所以我下载了它，./configure && make && sudo make install

• opam install tsdl

• 然后创建了一个文件main.ml（作为一个例子给出的上tsdl website）：

  open Tsdl 
  open Result 
  
  let main() = match Sdl.init Sdl.Init.video with 
      | Error (`Msg e) -> Sdl.log "Init error: %s" e; exit 1 
      | Ok() -> 
      match Sdl.create_window ~w:640 ~h:480 "SDL OpenGL" Sdl.Window.opengl with 
      | Error (`Msg e) -> Sdl.log "Create window error: %s" e; exit 1 
      | Ok w -> 
       Sdl.delay 3000l; 
       Sdl.destroy_window w; 
       Sdl.quit(); 
       exit 0 
  
  let() = main() 
  

• ocamlfind ocamlopt -package tsdl -linkpkg -o main.native main.ml

它的工作原理，现在来我的问题：

./main.native 
Fatal error: exception Dl.DL_error("./main.native: undefined symbol: SDL_GetError") 

难道我做错了什么或做我需要明确地告诉我哪里SDL2的lib是还是其他什么东西？

---

更新：

> ocamlobjinfo $(opam config var tsdl:lib)/tsdl.cmxa | grep Extra 
Extra C object files: -L/usr/local/lib -Wl,-rpath,/usr/local/lib -Wl,--enable-new-dtags -lSDL2 -ltsdl 
Extra C options: 

> sdl2-config --libs 
-L/usr/local/lib -Wl,-rpath,/usr/local/lib -Wl,--enable-new-dtags -lSDL2 

---

更新2：

> ldd ./main.native 
    linux-vdso.so.1 => (0x00007fff1f4c1000) 
    libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f4aff55e000) 
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4aff255000) 
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4aff050000) 
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4afec87000) 
    /lib64/ld-linux-x86-64.so.2 (0x000055dc05e17000) 

---

更新3

lhooq@lhooq ~/tsdl $ ocamlfind ocamlopt -cclib -lSDL2 -package tsdl -linkpkg -o min.native min.ml -verbose 

Effective set of compiler predicates: pkg_result,pkg_unix,pkg_bigarray,pkg_str,pkg_bytes,pkg_ctypes,pkg_ctypes.foreign.base,pkg_ctypes.foreign.unthreaded,pkg_ctypes.foreign,pkg_tsdl,autolink,native 
+ ocamlopt.opt -o min.native -verbose -I /home/lhooq/.opam/4.04.0/lib/result -I /home/lhooq/.opam/4.04.0/lib/bytes -I /home/lhooq/.opam/4.04.0/lib/ctypes -I /home/lhooq/.opam/4.04.0/lib/tsdl /home/lhooq/.opam/4.04.0/lib/result/result.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/unix.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/bigarray.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/str.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-base.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-unthreaded.cmxa /home/lhooq/.opam/4.04.0/lib/tsdl/tsdl.cmxa -cclib -lSDL2 min.ml 
+ as -o 'min.o' '/tmp/camlasm9ab424.s' 
+ as -o '/tmp/camlstartupe796c9.o' '/tmp/camlstartup4a1081.s' 
+ gcc -o 'min.native' '-L/home/lhooq/.opam/4.04.0/lib/result' '-L/home/lhooq/.opam/4.04.0/lib/bytes' '-L/home/lhooq/.opam/4.04.0/lib/ctypes' '-L/home/lhooq/.opam/4.04.0/lib/tsdl' '-L/home/lhooq/.opam/4.04.0/lib/ocaml' '/tmp/camlstartupe796c9.o' '/home/lhooq/.opam/4.04.0/lib/ocaml/std_exit.o' 'min.o' '/home/lhooq/.opam/4.04.0/lib/tsdl/tsdl.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-unthreaded.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-base.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/str.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/bigarray.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/unix.a' '/home/lhooq/.opam/4.04.0/lib/result/result.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/stdlib.a' '-L/usr/local/lib' '-Wl,-rpath,/usr/local/lib' '-Wl,--enable-new-dtags' '-lSDL2' '-ltsdl' '-Wl,--no-as-needed' '-lffi' '-lctypes-foreign-base_stubs' '-Wl,--no-as-needed' '-lffi' '-lctypes_stubs' '-Wl,--no-as-needed' '-lcamlstr' '-lbigarray' '-lunix' '-lSDL2' '/home/lhooq/.opam/4.04.0/lib/ocaml/libasmrun.a' -lm -ldl 

lhooq@lhooq ~/tsdl $ ocamlfind ocamlopt -package tsdl -linkpkg -o min.native min.ml -verbose 

Effective set of compiler predicates: pkg_result,pkg_unix,pkg_bigarray,pkg_str,pkg_bytes,pkg_ctypes,pkg_ctypes.foreign.base,pkg_ctypes.foreign.unthreaded,pkg_ctypes.foreign,pkg_tsdl,autolink,native 
+ ocamlopt.opt -o min.native -verbose -I /home/lhooq/.opam/4.04.0/lib/result -I /home/lhooq/.opam/4.04.0/lib/bytes -I /home/lhooq/.opam/4.04.0/lib/ctypes -I /home/lhooq/.opam/4.04.0/lib/tsdl /home/lhooq/.opam/4.04.0/lib/result/result.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/unix.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/bigarray.cmxa /home/lhooq/.opam/4.04.0/lib/ocaml/str.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-base.cmxa /home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-unthreaded.cmxa /home/lhooq/.opam/4.04.0/lib/tsdl/tsdl.cmxa min.ml 
+ as -o 'min.o' '/tmp/camlasm201bd8.s' 
+ as -o '/tmp/camlstartup7113e2.o' '/tmp/camlstartup4724f2.s' 
+ gcc -o 'min.native' '-L/home/lhooq/.opam/4.04.0/lib/result' '-L/home/lhooq/.opam/4.04.0/lib/bytes' '-L/home/lhooq/.opam/4.04.0/lib/ctypes' '-L/home/lhooq/.opam/4.04.0/lib/tsdl' '-L/home/lhooq/.opam/4.04.0/lib/ocaml' '/tmp/camlstartup7113e2.o' '/home/lhooq/.opam/4.04.0/lib/ocaml/std_exit.o' 'min.o' '/home/lhooq/.opam/4.04.0/lib/tsdl/tsdl.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-unthreaded.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes-foreign-base.a' '/home/lhooq/.opam/4.04.0/lib/ctypes/ctypes.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/str.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/bigarray.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/unix.a' '/home/lhooq/.opam/4.04.0/lib/result/result.a' '/home/lhooq/.opam/4.04.0/lib/ocaml/stdlib.a' '-L/usr/local/lib' '-Wl,-rpath,/usr/local/lib' '-Wl,--enable-new-dtags' '-lSDL2' '-ltsdl' '-Wl,--no-as-needed' '-lffi' '-lctypes-foreign-base_stubs' '-Wl,--no-as-needed' '-lffi' '-lctypes_stubs' '-Wl,--no-as-needed' '-lcamlstr' '-lbigarray' '-lunix' '/home/lhooq/.opam/4.04.0/lib/ocaml/libasmrun.a' -lm -ldl 

Answer 1

这似乎是tsdl中的一个小问题，请参阅此处以获取更多信息：https://github.com/dbuenzli/tsdl/issues/38

它固定在master中。正如笔者建议你可以（现在）这样做，因为一个临时的解决办法：

opam pin add tsdl --dev

编辑：由@dbuenzli指示低于这个固定在0.9.4这是它的方式OPAM。