detect endianness with cmake

CMakeLists.txt

@@ -104,6 +104,15 @@ set(TEST_CFLAGS "${LIB_CFLAGS} -fprofile-arcs -ftest-coverage")
 set(TEST_LDFLAGS "-fprofile-arcs -ftest-coverage")
 set(TEST_INCLUDES "${CMAKE_SOURCE_DIR}/test")
 
+include(TestBigEndian)
+test_big_endian(IS_BIG_ENDIAN)
+if(IS_BIG_ENDIAN)
+    set(SOUNDIO_OS_BIG_ENDIAN true)
+    set(SOUNDIO_OS_LITTLE_ENDIAN false)
+else()
+    set(SOUNDIO_OS_BIG_ENDIAN false)
+    set(SOUNDIO_OS_LITTLE_ENDIAN true)
+endif()
 configure_file (
     "${CMAKE_SOURCE_DIR}/src/config.h.in"
     ${CONFIGURE_OUT_FILE}

src/alsa.cpp

@@ -190,6 +190,13 @@ static void test_fmt_mask(SoundIoDevice *device, const snd_pcm_format_mask_t *fm
     }
 }
 
+// TODO: look at http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html#a27
+// deterimine what do do about:
+//  * hw buffer size
+//  * hw period time
+//  * sw start threshold
+//  * sw avail min
+
 static int probe_device(SoundIoDevice *device, snd_pcm_chmap_query_t **maps) {
     int err;
     snd_pcm_t *handle;

src/config.h.in

@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2015 Andrew Kelley
+ *
+ * This file is part of libsoundio, which is MIT licensed.
+ * See http://opensource.org/licenses/MIT
+ */
+
 #ifndef SOUNDIO_CONFIG_H
 #define SOUNDIO_CONFIG_H
 
@@ -6,6 +13,9 @@
 #define SOUNDIO_VERSION_PATCH @LIBSOUNDIO_VERSION_PATCH@
 #define SOUNDIO_VERSION_STRING "@LIBSOUNDIO_VERSION@"
 
+#cmakedefine SOUNDIO_OS_BIG_ENDIAN @SOUNDIO_OS_BIG_ENDIAN@
+#cmakedefine SOUNDIO_OS_LITTLE_ENDIAN @SOUNDIO_OS_LITTLE_ENDIAN@
+
 #cmakedefine SOUNDIO_HAVE_ALSA
 #cmakedefine SOUNDIO_HAVE_PULSEAUDIO
 

src/soundio.h

@@ -11,30 +11,6 @@
 #include "config.h"
 #include <stdbool.h>
 
-#if (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
-    defined(__BIG_ENDIAN__) || \
-    defined(__ARMEB__) || \
-    defined(__THUMBEB__) || \
-    defined(__AARCH64EB__) || \
-    defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
-
-#define SOUNDIO_OS_BIG_ENDIAN
-
-#elif (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
-    defined(__LITTLE_ENDIAN__) || \
-    defined(__ARMEL__) || \
-    defined(__THUMBEL__) || \
-    defined(__AARCH64EL__) || \
-    defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) || \
-    defined(_WIN32)
-
-#define SOUNDIO_OS_LITTLE_ENDIAN
-
-#else
-#error unknown byte order
-#endif
-
-
 #ifdef __cplusplus
 extern "C"
 {
@@ -180,6 +156,8 @@ enum SoundIoFormat {
 #define SoundIoFormatU32NE SoundIoFormatU32LE
 #define SoundIoFormatFloat32NE SoundIoFormatFloat32LE
 #define SoundIoFormatFloat64NE SoundIoFormatFloat64LE
+#else
+#error unknown byte order
 #endif
 
 struct SoundIoDevice {