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cmake: add SDL_LIBUDEV_SHARED option

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Anonymous Maarten 2026-05-07 16:21:41 +02:00
parent 5c0260c4a7
commit 1e9aa6af2b
4 changed files with 37 additions and 12 deletions
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3
CMakeLists.txt
View file

@ -392,7 +392,8 @@ dep_option(SDL_HIDAPI_LIBUSB "Use libusb for low level joystick drivers" O
dep_option(SDL_HIDAPI_LIBUSB_SHARED "Dynamically load libusb support" ON "SDL_HIDAPI_LIBUSB;SDL_DEPS_SHARED" OFF)
dep_option(SDL_HIDAPI_JOYSTICK "Use HIDAPI for low level joystick drivers" ON SDL_HIDAPI OFF)
dep_option(SDL_VIRTUAL_JOYSTICK "Enable the virtual-joystick driver" ON SDL_HIDAPI OFF)
set_option(SDL_LIBUDEV "Enable libudev support" ON)
dep_option(SDL_LIBUDEV "Enable libudev support" ON ${UNIX_SYS} OFF)
dep_option(SDL_LIBUDEV_SHARED "Dynamically load libudev support" ON "SDL_LIBUDEV;SDL_DEPS_SHARED" OFF)
set_option(SDL_ASAN "Use AddressSanitizer to detect memory errors" OFF)
set_option(SDL_CCACHE "Use Ccache to speed up build" OFF)
set_option(SDL_CLANG_TIDY "Run clang-tidy static analysis" OFF)

20
cmake/sdlchecks.cmake
View file

@ -1437,14 +1437,26 @@ endmacro()
macro(CheckLibUDev)
set(HAVE_LIBUDEV_H FALSE)
set(HAVE_LIBUDEV FALSE)
set(HAVE_LIBUDEV_SHARED OFF)
if(SDL_LIBUDEV)
check_include_file("libudev.h" HAVE_LIBUDEV_HEADER)
if(HAVE_LIBUDEV_HEADER)
set(HAVE_LIBUDEV_H TRUE)
FindLibraryAndSONAME(udev)
if(UDEV_LIB_SONAME)
set(SDL_UDEV_DYNAMIC "\"${UDEV_LIB_SONAME}\"")
set(HAVE_LIBUDEV TRUE)
set(HAVE_LIBUDEV TRUE)
if(SDL_LIBUDEV_SHARED)
if(NOT HAVE_SDL_LOADSO)
message(WARNING "You must have SDL_LoadObject() support for dynamic libudev support")
else()
FindLibraryAndSONAME(udev)
if(UDEV_LIB_SONAME)
set(SDL_UDEV_DYNAMIC "\"${UDEV_LIB_SONAME}\"")
set(HAVE_LIBUDEV_SHARED TRUE)
endif()
endif()
endif()
if(NOT HAVE_LIBUDEV_SHARED)
sdl_link_dependency(udev PRIVATE LIBS udev)
endif()
endif()
endif()

18
src/core/linux/SDL_udev.c
View file

@ -41,10 +41,8 @@
static const char *SDL_UDEV_LIBS[] = { SDL_UDEV_FALLBACK_LIBS };
#ifdef SDL_UDEV_DYNAMIC
#define SDL_UDEV_DLNOTE_LIBS SDL_UDEV_DYNAMIC, SDL_UDEV_FALLBACK_LIBS
#else
#define SDL_UDEV_DLNOTE_LIBS SDL_UDEV_FALLBACK_LIBS
#endif
SDL_ELF_NOTE_DLOPEN(
"events-udev",
@ -52,17 +50,21 @@ SDL_ELF_NOTE_DLOPEN(
SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
SDL_UDEV_DLNOTE_LIBS
)
#endif
static SDL_UDEV_PrivateData *_this = NULL;
#ifdef SDL_UDEV_DYNAMIC
static bool SDL_UDEV_load_sym(const char *fn, void **addr);
static bool SDL_UDEV_load_syms(void);
#endif
static bool SDL_UDEV_hotplug_update_available(void);
static void get_caps(struct udev_device *dev, struct udev_device *pdev, const char *attr, unsigned long *bitmask, size_t bitmask_len);
static int guess_device_class(struct udev_device *dev);
static int device_class(struct udev_device *dev);
static void device_event(SDL_UDEV_deviceevent type, struct udev_device *dev);
#ifdef SDL_UDEV_DYNAMIC
static bool SDL_UDEV_load_sym(const char *fn, void **addr)
{
*addr = SDL_LoadFunction(_this->udev_handle, fn);
@ -73,9 +75,12 @@ static bool SDL_UDEV_load_sym(const char *fn, void **addr)
return true;
}
#endif
static bool SDL_UDEV_load_syms(void)
{
#ifdef SDL_UDEV_DYNAMIC
/* cast funcs to char* first, to please GCC's strict aliasing rules. */
#define SDL_UDEV_SYM(x) \
if (!SDL_UDEV_load_sym(#x, (void **)(char *)&_this->syms.x)) \
@ -83,6 +88,13 @@ static bool SDL_UDEV_load_syms(void)
#define SDL_UDEV_SYM_OPTIONAL(x) \
SDL_UDEV_load_sym(#x, (void **)(char *)&_this->syms.x);
#else
#define SDL_UDEV_SYM(x) \
_this->syms.x = x;
#define SDL_UDEV_SYM_OPTIONAL(x) \
_this->syms.x = x;
#endif
SDL_UDEV_SYM(udev_device_get_action);
SDL_UDEV_SYM(udev_device_get_devnode);

8
src/core/linux/SDL_udev.h
View file

@ -64,13 +64,13 @@ typedef struct SDL_UDEV_Symbols
const char *(*udev_device_get_property_value)(struct udev_device *, const char *);
const char *(*udev_device_get_sysattr_value)(struct udev_device *udev_device, const char *sysattr);
struct udev_device *(*udev_device_new_from_syspath)(struct udev *, const char *);
void (*udev_device_unref)(struct udev_device *);
struct udev_device *(*udev_device_unref)(struct udev_device *);
int (*udev_enumerate_add_match_property)(struct udev_enumerate *, const char *, const char *);
int (*udev_enumerate_add_match_subsystem)(struct udev_enumerate *, const char *);
struct udev_list_entry *(*udev_enumerate_get_list_entry)(struct udev_enumerate *);
struct udev_enumerate *(*udev_enumerate_new)(struct udev *);
int (*udev_enumerate_scan_devices)(struct udev_enumerate *);
void (*udev_enumerate_unref)(struct udev_enumerate *);
struct udev_enumerate *(*udev_enumerate_unref)(struct udev_enumerate *);
const char *(*udev_list_entry_get_name)(struct udev_list_entry *);
const char *(*udev_list_entry_get_value)(struct udev_list_entry *);
struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *);
@ -79,9 +79,9 @@ typedef struct SDL_UDEV_Symbols
int (*udev_monitor_get_fd)(struct udev_monitor *);
struct udev_monitor *(*udev_monitor_new_from_netlink)(struct udev *, const char *);
struct udev_device *(*udev_monitor_receive_device)(struct udev_monitor *);
void (*udev_monitor_unref)(struct udev_monitor *);
struct udev_monitor *(*udev_monitor_unref)(struct udev_monitor *);
struct udev *(*udev_new)(void);
void (*udev_unref)(struct udev *);
struct udev *(*udev_unref)(struct udev *);
struct udev_device *(*udev_device_new_from_devnum)(struct udev *udev, char type, dev_t devnum);
dev_t (*udev_device_get_devnum)(struct udev_device *udev_device);