At Fri, 16 Mar 2007 06:17:00 -0700 (PDT), Ciaccia wrote: > > Hi there, > I would like to compile an alsa application for an > embedded system with no shared-libraries support. My > application just needs PCM, with no plug-ins, no mixer > and no midi and the application should be a standalone > executable with no external dependencies, otherwise it > will not work. > > I tried to compile alsa-lib with static support, but > without luck (-ldl is always needed in the gcc line > and gcc always prints some weird warnings). Since I > don't need external plugins nor ladspa, I think there > should be a way to compile an application in a 100% > static manner, but I still have to figure out how. > > I also found this thread with a similar problem with > uClinux > http://www.mail-archive.com/alsa-user@xxxxxxxxxxxxxxxxxxxxx/msg18253.html > but at the end I did not understand how/if the problem > was solved. > > Do you think it should be possible to compile alsa-lib > with no dependencies on dl? How? > > Otherwise, would it be possible to write an alsa > application that does not rely on alsa-lib (i.e., > by using the alsa kernel APIs directly)? Has someone > already tried it? Some hints? > > Every hint is extremely welcome I worked on this sometime ago, and made a patch to build alsa-lib without pthread and libdl. I don't remember why this wasn't applied. IIRC, ulibc has the wrappers for pthread and libdl, so this wasn't needed at that time in the end. Otherwise, it should work. Build with --enable-static --disable-shared, --disble-mixer, --disable-hwdep, etc. Takashi diff -r f1203eb7eb48 configure.in --- a/configure.in Tue Mar 13 10:44:28 2007 +0100 +++ b/configure.in Fri Mar 16 15:07:51 2007 +0100 @@ -148,6 +148,23 @@ else else AC_MSG_RESULT(no) fi + +AC_CHECK_LIB([dl], [dlsym], [HAVE_LIBDL="yes"]) +AC_CHECK_LIB([pthread], [pthread_join], [HAVE_LIBPTHREAD="yes"]) + +ALSA_DEPLIBS="" +if test "$softfloat" != "yes"; then + ALSA_DEPLIBS="-lm" +fi +if test "$HAVE_LIBDL" = "yes"; then + ALSA_DEPLIBS="$ALSA_DEPLIBS -ldl" + AC_DEFINE([HAVE_LIBDL], 1, [Have libdl]) +fi +if test "$HAVE_LIBPTHREAD" = "yes"; then + ALSA_DEPLIBS="$ALSA_DEPLIBS -lpthread" + AC_DEFINE([HAVE_LIBPTHREAD], 1, [Have libpthread]) +fi +AC_SUBST(ALSA_DEPLIBS) dnl Check for architecture AC_MSG_CHECKING(for architecture) diff -r f1203eb7eb48 include/local.h --- a/include/local.h Tue Mar 13 10:44:28 2007 +0100 +++ b/include/local.h Fri Mar 16 15:07:51 2007 +0100 @@ -36,6 +36,11 @@ #include "config.h" #ifdef SUPPORT_RESMGR #include <resmgr.h> +#endif +#ifdef HAVE_LIBDL +#include <dlfcn.h> +#else +#define RTLD_NOW 0 #endif #define _snd_config_iterator list_head diff -r f1203eb7eb48 src/Makefile.am --- a/src/Makefile.am Tue Mar 13 10:44:28 2007 +0100 +++ b/src/Makefile.am Fri Mar 16 15:07:51 2007 +0100 @@ -41,7 +41,7 @@ libasound_la_LIBADD += alisp/libalisp.la libasound_la_LIBADD += alisp/libalisp.la endif SUBDIRS += compat conf -libasound_la_LIBADD += compat/libcompat.la -lm -ldl -lpthread +libasound_la_LIBADD += compat/libcompat.la @ALSA_DEPLIBS@ libasound_la_LDFLAGS = -version-info $(COMPATNUM) $(VSYMS) diff -r f1203eb7eb48 src/async.c --- a/src/async.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/async.c Fri Mar 16 15:07:51 2007 +0100 @@ -151,9 +151,11 @@ int snd_async_del_handler(snd_async_hand if (!list_empty(&handler->hlist)) goto _end; switch (handler->type) { +#ifdef BUILD_PCM case SND_ASYNC_HANDLER_PCM: err = snd_pcm_async(handler->u.pcm, -1, 1); break; +#endif case SND_ASYNC_HANDLER_CTL: err = snd_ctl_async(handler->u.ctl, -1, 1); break; diff -r f1203eb7eb48 src/conf.c --- a/src/conf.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/conf.c Fri Mar 16 15:07:51 2007 +0100 @@ -415,12 +415,13 @@ beginning:</P> #include <stdarg.h> -#include <dlfcn.h> #include <limits.h> #include <sys/stat.h> -#include <pthread.h> #include <locale.h> #include "local.h" +#ifdef HAVE_LIBPTHREAD +#include <pthread.h> +#endif #ifndef DOC_HIDDEN @@ -3080,7 +3081,9 @@ int snd_config_update_r(snd_config_t **_ return 1; } +#ifdef HAVE_LIBPTHREAD static pthread_mutex_t snd_config_update_mutex = PTHREAD_MUTEX_INITIALIZER; +#endif /** * \brief Updates #snd_config by rereading the global configuration files (if needed). @@ -3099,9 +3102,13 @@ int snd_config_update(void) { int err; +#ifdef HAVE_LIBPTHREAD pthread_mutex_lock(&snd_config_update_mutex); +#endif err = snd_config_update_r(&snd_config, &snd_config_global_update, NULL); +#ifdef HAVE_LIBPTHREAD pthread_mutex_unlock(&snd_config_update_mutex); +#endif return err; } @@ -3128,15 +3135,18 @@ int snd_config_update_free(snd_config_up */ int snd_config_update_free_global(void) { +#ifdef HAVE_LIBPTHREAD pthread_mutex_lock(&snd_config_update_mutex); +#endif if (snd_config) snd_config_delete(snd_config); snd_config = NULL; if (snd_config_global_update) snd_config_update_free(snd_config_global_update); snd_config_global_update = NULL; +#ifdef HAVE_LIBPTHREAD pthread_mutex_unlock(&snd_config_update_mutex); - +#endif /* FIXME: better to place this in another place... */ snd_dlobj_cache_cleanup(); diff -r f1203eb7eb48 src/confmisc.c --- a/src/confmisc.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/confmisc.c Fri Mar 16 15:07:51 2007 +0100 @@ -946,6 +946,8 @@ SND_DLSYM_BUILD_VERSION(snd_func_card_na SND_DLSYM_BUILD_VERSION(snd_func_card_name, SND_CONFIG_DLSYM_VERSION_EVALUATE); #endif +#ifdef BUILD_PCM + /** * \brief Returns the pcm identification of a device. * \param dst The function puts the handle to the result configuration node @@ -1198,6 +1200,8 @@ int snd_func_private_pcm_subdevice(snd_c #ifndef DOC_HIDDEN SND_DLSYM_BUILD_VERSION(snd_func_private_pcm_subdevice, SND_CONFIG_DLSYM_VERSION_EVALUATE); #endif + +#endif /* BUILD_PCM */ /** * \brief Copies the specified configuration node. diff -r f1203eb7eb48 src/control/control.c --- a/src/control/control.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/control/control.c Fri Mar 16 15:07:51 2007 +0100 @@ -47,7 +47,6 @@ and IEC958 structure. #include <string.h> #include <fcntl.h> #include <signal.h> -#include <dlfcn.h> #include <sys/poll.h> #include "control_local.h" diff -r f1203eb7eb48 src/control/hcontrol.c --- a/src/control/hcontrol.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/control/hcontrol.c Fri Mar 16 15:07:51 2007 +0100 @@ -48,11 +48,13 @@ to reduce overhead accessing the real co #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> -#include <pthread.h> #ifndef DOC_HIDDEN #define __USE_GNU #endif #include "control_local.h" +#ifdef HAVE_LIBPTHREAD +#include <pthread.h> +#endif #ifndef DOC_HIDDEN #define NOT_FOUND 1000000000 @@ -420,17 +422,22 @@ static void snd_hctl_sort(snd_hctl_t *hc static void snd_hctl_sort(snd_hctl_t *hctl) { unsigned int k; +#ifdef HAVE_LIBPTHREAD static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER; +#endif assert(hctl); assert(hctl->compare); INIT_LIST_HEAD(&hctl->elems); +#ifdef HAVE_LIBPTHREAD pthread_mutex_lock(&sync_lock); +#endif compare_hctl = hctl; qsort(hctl->pelems, hctl->count, sizeof(*hctl->pelems), hctl_compare); +#ifdef HAVE_LIBPTHREAD pthread_mutex_unlock(&sync_lock); - +#endif for (k = 0; k < hctl->count; k++) list_add_tail(&hctl->pelems[k]->list, &hctl->elems); } diff -r f1203eb7eb48 src/dlmisc.c --- a/src/dlmisc.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/dlmisc.c Fri Mar 16 15:07:51 2007 +0100 @@ -28,7 +28,6 @@ */ #define _GNU_SOURCE -#include <dlfcn.h> #include "list.h" #include "local.h" @@ -53,13 +52,19 @@ void *snd_dlopen(const char *name, int m if (name == NULL) return &snd_dlsym_start; #else +#ifdef HAVE_LIBDL if (name == NULL) { Dl_info dlinfo; if (dladdr(snd_dlopen, &dlinfo) > 0) name = dlinfo.dli_fname; } #endif +#endif +#ifdef HAVE_LIBDL return dlopen(name, mode); +#else + return NULL; +#endif } /** @@ -76,7 +81,11 @@ int snd_dlclose(void *handle) if (handle == &snd_dlsym_start) return 0; #endif +#ifdef HAVE_LIBDL return dlclose(handle); +#else + return 0; +#endif } /** @@ -91,6 +100,7 @@ int snd_dlclose(void *handle) */ static int snd_dlsym_verify(void *handle, const char *name, const char *version) { +#ifdef HAVE_LIBDL int res; char *vname; @@ -107,6 +117,9 @@ static int snd_dlsym_verify(void *handle if (res < 0) SNDERR("unable to verify version for symbol %s", name); return res; +#else + return 0; +#endif } /** @@ -139,10 +152,14 @@ void *snd_dlsym(void *handle, const char return NULL; } #endif +#ifdef HAVE_LIBDL err = snd_dlsym_verify(handle, name, version); if (err < 0) return NULL; return dlsym(handle, name); +#else + return NULL; +#endif } /* diff -r f1203eb7eb48 src/hwdep/hwdep.c --- a/src/hwdep/hwdep.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/hwdep/hwdep.c Fri Mar 16 15:07:52 2007 +0100 @@ -33,7 +33,6 @@ #include <unistd.h> #include <string.h> #include <fcntl.h> -#include <dlfcn.h> #include <sys/ioctl.h> #include "hwdep_local.h" diff -r f1203eb7eb48 src/pcm/pcm.c --- a/src/pcm/pcm.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm.c Fri Mar 16 15:07:52 2007 +0100 @@ -634,7 +634,6 @@ playback devices. #include <malloc.h> #include <stdarg.h> #include <signal.h> -#include <dlfcn.h> #include <sys/poll.h> #include <sys/shm.h> #include <sys/mman.h> diff -r f1203eb7eb48 src/pcm/pcm_hooks.c --- a/src/pcm/pcm_hooks.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm_hooks.c Fri Mar 16 15:07:52 2007 +0100 @@ -27,7 +27,6 @@ * */ -#include <dlfcn.h> #include "pcm_local.h" #include "pcm_generic.h" diff -r f1203eb7eb48 src/pcm/pcm_ladspa.c --- a/src/pcm/pcm_ladspa.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm_ladspa.c Fri Mar 16 15:07:52 2007 +0100 @@ -33,7 +33,6 @@ */ #include <dirent.h> -#include <dlfcn.h> #include <locale.h> #include <math.h> #include "pcm_local.h" diff -r f1203eb7eb48 src/pcm/pcm_meter.c --- a/src/pcm/pcm_meter.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm_meter.c Fri Mar 16 15:07:52 2007 +0100 @@ -29,11 +29,12 @@ #include <byteswap.h> #include <time.h> -#include <pthread.h> -#include <dlfcn.h> #include "pcm_local.h" #include "pcm_plugin.h" #include "iatomic.h" +#ifdef HAVE_LIBPTHREAD +#include <pthread.h> +#endif #ifndef PIC /* entry for static linking */ @@ -42,6 +43,20 @@ const char *_snd_module_pcm_meter = ""; #ifndef DOC_HIDDEN #define FREQUENCY 50 + +#ifndef HAVE_LIBPTHREAD +#define pthread_mutex_trylock(x) 1 +#define pthread_mutex_lock(x) +#define pthread_mutex_unlock(x) +#define pthread_mutex_init(x, y) +#define pthread_mutex_destroy(x) +#define pthread_cond_init(x, y) +#define pthread_cond_destroy(x) +#define pthread_cond_wait(x, y) +#define pthread_cond_signal(x) +#define pthread_create(a, b, c, d) +#define pthread_join(a, b) +#endif struct _snd_pcm_scope { int enabled; @@ -62,10 +77,12 @@ typedef struct _snd_pcm_meter { int closed; int running; atomic_t reset; +#ifdef HAVE_LIBPTHREAD pthread_t thread; pthread_mutex_t update_mutex; pthread_mutex_t running_mutex; pthread_cond_t running_cond; +#endif struct timespec delay; void *dl_handle; } snd_pcm_meter_t; diff -r f1203eb7eb48 src/pcm/pcm_rate.c --- a/src/pcm/pcm_rate.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm_rate.c Fri Mar 16 15:07:52 2007 +0100 @@ -29,7 +29,6 @@ */ #include <inttypes.h> #include <byteswap.h> -#include <dlfcn.h> #include "pcm_local.h" #include "pcm_plugin.h" #include "pcm_rate.h" diff -r f1203eb7eb48 src/pcm/pcm_share.c --- a/src/pcm/pcm_share.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/pcm/pcm_share.c Fri Mar 16 15:07:52 2007 +0100 @@ -36,8 +36,10 @@ #include <sys/socket.h> #include <sys/poll.h> #include <sys/shm.h> +#include "pcm_local.h" +#ifdef HAVE_LIBPTHREAD #include <pthread.h> -#include "pcm_local.h" +#endif #ifndef PIC /* entry for static linking */ @@ -47,8 +49,11 @@ const char *_snd_module_pcm_share = ""; #ifndef DOC_HIDDEN static LIST_HEAD(snd_pcm_share_slaves); +#ifdef HAVE_LIBPTHREAD static pthread_mutex_t snd_pcm_share_slaves_mutex = PTHREAD_MUTEX_INITIALIZER; - +#endif + +#ifdef HAVE_LIBPTHREAD #ifdef MUTEX_DEBUG #define Pthread_mutex_lock(mutex) \ char *snd_pcm_share_slaves_mutex_holder; @@ -71,6 +76,18 @@ do { \ #define Pthread_mutex_lock(mutex) pthread_mutex_lock(mutex) #define Pthread_mutex_unlock(mutex) pthread_mutex_unlock(mutex) #endif +#else /* !HAVE_LIBPTHREAD */ +#define Pthread_mutex_lock(mutex) +#define Pthread_mutex_unlock(mutex) +#define pthread_create(a, b, c, d) +#define pthread_join(a, b) +#define pthread_mutex_init(a, b) +#define pthread_mutex_destroy(a) +#define pthread_cond_init(a, b) +#define pthread_cond_destroy(a) +#define pthread_cond_wait(a, b) +#define pthread_cond_signal(a) +#endif /* HAVE_LIBPTHREAD */ typedef struct { struct list_head clients; @@ -91,12 +108,14 @@ typedef struct { snd_pcm_uframes_t hw_ptr; int poll[2]; int polling; +#ifdef HAVE_LIBPTHREAD pthread_t thread; pthread_mutex_t mutex; #ifdef MUTEX_DEBUG char *mutex_holder; #endif pthread_cond_t poll_cond; +#endif } snd_pcm_share_slave_t; typedef struct { diff -r f1203eb7eb48 src/rawmidi/rawmidi.c --- a/src/rawmidi/rawmidi.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/rawmidi/rawmidi.c Fri Mar 16 15:07:52 2007 +0100 @@ -139,7 +139,6 @@ This example shows open and read/write r #include <stdarg.h> #include <unistd.h> #include <string.h> -#include <dlfcn.h> #include "rawmidi_local.h" /** diff -r f1203eb7eb48 src/seq/seq.c --- a/src/seq/seq.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/seq/seq.c Fri Mar 16 15:07:52 2007 +0100 @@ -777,7 +777,6 @@ void event_filter(snd_seq_t *seq, snd_se */ -#include <dlfcn.h> #include <sys/poll.h> #include "seq_local.h" diff -r f1203eb7eb48 src/timer/timer.c --- a/src/timer/timer.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/timer/timer.c Fri Mar 16 15:07:52 2007 +0100 @@ -72,7 +72,6 @@ This example shows opening a timer devic #include <unistd.h> #include <string.h> #include <fcntl.h> -#include <dlfcn.h> #include <signal.h> #include <sys/ioctl.h> #include "timer_local.h" diff -r f1203eb7eb48 src/timer/timer_query.c --- a/src/timer/timer_query.c Tue Mar 13 10:44:28 2007 +0100 +++ b/src/timer/timer_query.c Fri Mar 16 15:07:52 2007 +0100 @@ -31,7 +31,6 @@ #include <unistd.h> #include <string.h> #include <fcntl.h> -#include <dlfcn.h> #include <sys/ioctl.h> #include "timer_local.h" diff -r f1203eb7eb48 utils/alsa.pc.in --- a/utils/alsa.pc.in Tue Mar 13 10:44:28 2007 +0100 +++ b/utils/alsa.pc.in Fri Mar 16 15:07:52 2007 +0100 @@ -8,7 +8,7 @@ Version: @VERSION@ Version: @VERSION@ Requires: Libs: -L${libdir} -lasound -Libs.private: -lm -ldl -lpthread +Libs.private: @ALSA_DEPLIBS@ # -I${includedir}/alsa below is just for backward compatibility # (it was set so mistakely in the older version) Cflags: -I${includedir} -I${includedir}/alsa ------------------------------------------------------------------------- Take Surveys. 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