audio: hifi: Guard <xtensa/config/defs.h> with __has_include

The HiFi3 / HiFi4 / HiFi5 sources unconditionally include
<xtensa/config/defs.h>, a header that ships only with the Cadence
xt-clang / xt-gcc toolchains. The LLVM clang toolchain variant uses
the Zephyr SDK GNU Xtensa binutils for assembly/linking but does
not expose that Cadence-internal header, so every HiFi
translation unit fails to find it even though the body of the file
is guarded by SOF_USE_HIFI(...) and is unreachable for the LLVM
build.

Wrap the include in __has_include so the compiler silently skips
it on toolchains that lack the header. The HiFi intrinsics are
already supplied by <xtensa/tie/xt_hifiN.h>, which the LLVM
toolchain does provide.

No functional change for the Cadence toolchain path.

Signed-off-by: Henry Liao <hliao8@proton.me>

Author: hliao8

src/audio/aria/aria_hifi3.c

@@ -5,7 +5,13 @@
 #include "aria.h"
 
 #if SOF_USE_HIFI(3, ARIA) || SOF_USE_HIFI(4, ARIA)
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi3.h>
 
 extern const int32_t sof_aria_index_tab[];

src/audio/aria/aria_hifi5.c

@@ -5,7 +5,13 @@
 #include "aria.h"
 
 #if SOF_USE_HIFI(5, ARIA)
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi5.h>
 
 extern const int32_t sof_aria_index_tab[];

src/audio/eq_fir/eq_fir_hifi2ep.c

@@ -13,7 +13,13 @@
 #include <sof/audio/buffer.h>
 #include <sof/audio/format.h>
 #include <sof/math/fir_hifi2ep.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi2.h>
 #include <errno.h>
 #include <stddef.h>

src/audio/eq_fir/eq_fir_hifi3.c

@@ -12,7 +12,13 @@
 #include <sof/audio/module_adapter/module/generic.h>
 #include <sof/math/fir_hifi3.h>
 #include <user/fir.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi3.h>
 #include <errno.h>
 #include <stddef.h>

src/audio/src/src_hifi2ep.c

@@ -12,7 +12,13 @@
 
 #include "src_common.h"
 
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi2.h>
 #include <stddef.h>
 #include <stdint.h>

src/audio/src/src_hifi3.c

@@ -12,7 +12,13 @@
 
 #include "src_common.h"
 
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi3.h>
 #include <stddef.h>
 #include <stdint.h>

src/audio/src/src_hifi4.c

@@ -14,7 +14,13 @@
 #include "src_common.h"
 
 #include <sof/math/numbers.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi4.h>
 #include <stddef.h>
 #include <stdint.h>

src/audio/src/src_hifi5.c

@@ -14,7 +14,13 @@
 #include "src_common.h"
 
 #include <sof/math/numbers.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi5.h>
 #include <stddef.h>
 #include <stdint.h>

src/include/sof/audio/format_hifi3.h

@@ -9,7 +9,13 @@
 #define __SOF_AUDIO_FORMAT_HIFI3_H__
 
 #include <stdint.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi3.h>
 
 /* Saturation inline functions */

src/include/sof/math/fir_hifi2ep.h

@@ -16,7 +16,13 @@
 #include <sof/audio/audio_stream.h>
 #include <sof/audio/buffer.h>
 #include <user/fir.h>
-#include <xtensa/config/defs.h>
+#if defined(__has_include)
+#  if __has_include(<xtensa/config/defs.h>)
+#    include <xtensa/config/defs.h>
+#  endif
+#else
+#  include <xtensa/config/defs.h>
+#endif
 #include <xtensa/tie/xt_hifi2.h>
 #include <stdint.h>