使用cmake build xbindkeys:错误未知类型名称'Display‘

Question

环境: ubuntu20.04 cmake3.15

我从：https://www.nongnu.org/xbindkeys/下载xbindkey，并尝试使用cmake来构建它。我可以使用原生配置(Autoconf)成功地构建它，但是当我使用cmake时，总是会得到未知的类型名错误；cmakelist.txt：

cmake_minimum_required(VERSION 3.10)
project(xbindkeys LANGUAGES C VERSION 1.8.7)

#for x11
find_package(X11)
if(X11_FOUND)
        message(STATUS "X11 found")
else()
        message(STATUS "X11 NOT FOUND") 
endif(X11_FOUND)
#find_package(Boost  COMPONENTS log log_setup system thread REQUIRED)
aux_source_directory(. SRCS)
message(STATUS "all src:${SRCS}")
message(STATUS "X11 libries:${X11_LIBRARIES}")
file (GLOB H_Files "./*.h")

include_directories(./ ${X11_INCLUDE_DIR} /usr/include/X11/)
message(STATUS "cmake found x11 dir:${X11_INCLUDE_DIR}")

set(GCC_CXX_FLAGS "${GCC_CXX_FLAGS} -lX11")
add_executable(xbindkeys.app ${SRCS})
link_directories(${X11_LIBRARIES})
target_link_libraries(xbindkeys.app ${X11_LIBRARIES} -lX11)

在生成makefile并运行make.get之后，消息如下：

[ 16%] Building C object CMakeFiles/xbindkeys.app.dir/get_key.c.o
[ 33%] Building C object CMakeFiles/xbindkeys.app.dir/grab_key.c.o
In file included from /home/eton/workspace/xbindkeys/grab_key.c:18:
/home/eton/workspace/xbindkeys/grab_key.h:21:23: error: unknown type name 鈥楧isplay鈥?
   21 | extern void grab_keys(Display* dpy);
      |                       ^~~~~~~
/home/eton/workspace/xbindkeys/grab_key.h:22:29: error: unknown type name 鈥楧isplay鈥?
   22 | extern void ungrab_all_keys(Display* dpy);
      |                             ^~~~~~~
/home/eton/workspace/xbindkeys/grab_key.h:24:37: error: unknown type name 鈥楧isplay鈥?
   24 | extern void get_offending_modifiers(Display* dpy);
      |                                     ^~~~~~~
/home/eton/workspace/xbindkeys/grab_key.c: In function 鈥榞rab_keys鈥?
/home/eton/workspace/xbindkeys/grab_key.c:223:16: warning: 鈥榅KeycodeToKeysym鈥?is deprecated [-Wdeprecated-declarations]
  223 |                XKeysymToString(XKeycodeToKeysym(dpy, keys[i].key.code, 0)));
      |                ^~~~~~~~~~~~~~~
In file included from /home/eton/workspace/xbindkeys/grab_key.c:20:
/usr/include/X11/Xlib.h:1687:15: note: declared here
 1687 | extern KeySym XKeycodeToKeysym(
      |               ^~~~~~~~~~~~~~~~
make[2]: *** [CMakeFiles/xbindkeys.app.dir/build.make:76: CMakeFiles/xbindkeys.app.dir/grab_key.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:76: CMakeFiles/xbindkeys.app.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

有人能帮上忙吗？由于本课题结合了C语言中的CMake和X11库，所以web上的信息不多。所以我来这里问问。

Answer 1

最终我找到了答案。错误原因如下：

grab_key.h:21:23: error: unknown type name ‘Display’

21 |外部空grab_keys(显示* dpy)；| ^~~是头文件"grab_key.h“不包含X11头文件。

我修改内容如下：

 18 #ifndef __GRABKEY_H
 19 #define __GRABKEY_H
 20 
 21 #include <X11/Xlib.h> //add this
 22 #include <X11/keysym.h> //add this
 23 extern void grab_keys(Display* dpy);
 24 extern void ungrab_all_keys(Display* dpy);
 25 
 26 extern void get_offending_modifiers(Display* dpy);
 27 
 28 extern unsigned int numlock_mask;
 29 extern unsigned int scrolllock_mask;
 30 extern unsigned int capslock_mask;
 31 
 32 #endif /* __GRABKEY_H */

然后，cmake生成的makefile可以成功创建二进制exe文件。