iiod: thread-pool: define HAS_PTHREAD_SETNAME_NP as 0 or 1

Instead of making HAS_PTHREAD_SETNAME_NP as a "pure" preprocessor define,
make it defined with a value of 0 or 1 so that we can use it normal
code and since it's a compile time constant, the compiler can get rid of
dead code when it evaluates to 0.

This change will also make it cleaner for adding support for naming
pthreads.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>

iio-config.h.cmakein

@@ -43,14 +43,14 @@
 #cmakedefine01 HAVE_AVAHI
 #cmakedefine01 WITH_ZSTD
 #cmakedefine01 NO_THREADS
+#cmakedefine01 HAS_PTHREAD_SETNAME_NP
 
 #cmakedefine HAS_PIPE2
 #cmakedefine HAS_STRDUP
 #cmakedefine HAS_STRNDUP
 #cmakedefine HAS_STRTOK_R
 #cmakedefine HAS_STRERROR_R
 #cmakedefine HAS_NEWLOCALE
-#cmakedefine HAS_PTHREAD_SETNAME_NP
 #cmakedefine HAVE_IPV6
 
 #define IF_ENABLED(cfg, ptr) ((cfg) ? (ptr) : NULL)

iiod/thread-pool.c

@@ -6,6 +6,7 @@
  * Author: Paul Cercueil <paul.cercueil@analog.com>
  */
 
+#include "iio-config.h"
 #include "thread-pool.h"
 
 #include <errno.h>
@@ -101,10 +102,8 @@ int thread_pool_add_thread(struct thread_pool *pool,
 	if (ret) {
 		free(pdata);
 		thread_pool_thread_stopped(pool);
-	} else {
-#ifdef HAS_PTHREAD_SETNAME_NP
+	} else if (HAS_PTHREAD_SETNAME_NP) {
 		pthread_setname_np(thd, name);
-#endif
 	}
 
 	pthread_attr_destroy(&attr);