https://bugs.gentoo.org/766156
https://github.com/AOMediaCodec/SVT-AV1/commit/09c90e4cfb602b9a247a8a256923bdbddaf2ed9b

From 09c90e4cfb602b9a247a8a256923bdbddaf2ed9b Mon Sep 17 00:00:00 2001
From: Slawomir Pawlowski <slawomir.pawlowski@intel.com>
Date: Fri, 18 Dec 2020 16:47:20 +0100
Subject: [PATCH] Fix C only build

---
 CMakeLists.txt                            | 5 ++++-
 Source/Lib/Common/Codec/common_dsp_rtcd.c | 5 ++++-
 Source/Lib/Common/Codec/common_dsp_rtcd.h | 2 ++
 Source/Lib/Decoder/CMakeLists.txt         | 5 ++++-
 Source/Lib/Encoder/CMakeLists.txt         | 5 ++++-
 Source/Lib/Encoder/Codec/firstpass.c      | 2 +-
 6 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8baff740b1..efdd7385fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -302,6 +302,9 @@ if(BUILD_TESTING)
 endif()
 
 add_subdirectory(third_party/fastfeat)
-add_subdirectory(third_party/cpuinfo)
+
+if(NOT COMPILE_C_ONLY AND HAVE_X86_PLATFORM)
+    add_subdirectory(third_party/cpuinfo)
+endif()
 
 install(DIRECTORY ${PROJECT_SOURCE_DIR}/Source/API/ DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/svt-av1" FILES_MATCHING PATTERN "*.h")
diff --git a/Source/Lib/Common/Codec/common_dsp_rtcd.c b/Source/Lib/Common/Codec/common_dsp_rtcd.c
index e24f99f66b..c09f088b88 100644
--- a/Source/Lib/Common/Codec/common_dsp_rtcd.c
+++ b/Source/Lib/Common/Codec/common_dsp_rtcd.c
@@ -17,8 +17,10 @@
 #include "EbPackUnPack_C.h"
 #include "EbAvcStyleMcp.h"
 
+#ifdef ARCH_X86_64
 // for get_cpu_flags
 #include "cpuinfo.h"
+#endif
 
 /*
  * DSP deprecated flags
@@ -69,7 +71,7 @@ int64_t svt_av1_block_error_c(const TranLow *coeff, const TranLow *dqcoeff,
 /**************************************
  * Instruction Set Support
  **************************************/
-
+#ifdef ARCH_X86_64
 CPU_FLAGS get_cpu_flags() {
     CPU_FLAGS flags = 0;
 
@@ -105,6 +107,7 @@ CPU_FLAGS get_cpu_flags_to_use() {
 #endif
     return flags;
 }
+#endif /*ARCH_X86_64*/
 
 #ifdef ARCH_X86_64
 #ifndef NON_AVX512_SUPPORT
diff --git a/Source/Lib/Common/Codec/common_dsp_rtcd.h b/Source/Lib/Common/Codec/common_dsp_rtcd.h
index b76882b003..f67243f3d4 100644
--- a/Source/Lib/Common/Codec/common_dsp_rtcd.h
+++ b/Source/Lib/Common/Codec/common_dsp_rtcd.h
@@ -67,8 +67,10 @@ extern "C" {
 #endif
 
     // Helper Functions
+#ifdef ARCH_X86_64
     CPU_FLAGS get_cpu_flags();
     CPU_FLAGS get_cpu_flags_to_use();
+#endif
     void setup_common_rtcd_internal(CPU_FLAGS flags);
     void svt_aom_blend_a64_vmask_c(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0, uint32_t src0_stride, const uint8_t *src1, uint32_t src1_stride, const uint8_t *mask, int w, int h);
     RTCD_EXTERN void(*svt_aom_blend_a64_vmask)(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0, uint32_t src0_stride, const uint8_t *src1, uint32_t src1_stride, const uint8_t *mask, int w, int h);
diff --git a/Source/Lib/Decoder/CMakeLists.txt b/Source/Lib/Decoder/CMakeLists.txt
index c8ffc57657..c71c4da0b8 100644
--- a/Source/Lib/Decoder/CMakeLists.txt
+++ b/Source/Lib/Decoder/CMakeLists.txt
@@ -99,7 +99,9 @@ set_target_properties(SvtAv1Dec PROPERTI
 set_target_properties(SvtAv1Dec PROPERTIES SOVERSION ${DEC_VERSION_MAJOR})
 add_dependencies(SvtAv1Dec EbVersionHeaderGen)
 target_link_libraries(SvtAv1Dec PUBLIC ${PLATFORM_LIBS})
-target_link_libraries(SvtAv1Dec PRIVATE cpuinfo_public)
+if(NOT COMPILE_C_ONLY AND HAVE_X86_PLATFORM)
+    target_link_libraries(SvtAv1Dec PRIVATE cpuinfo_public)
+endif()
 install(TARGETS SvtAv1Dec DESTINATION "${CMAKE_INSTALL_LIBDIR}")

 configure_file(pkg-config.pc.in ${CMAKE_BINARY_DIR}/SvtAv1Dec.pc @ONLY)
diff --git a/Source/Lib/Encoder/CMakeLists.txt b/Source/Lib/Encoder/CMakeLists.txt
index 936592e1ce..ab310dcef1 100644
--- a/Source/Lib/Encoder/CMakeLists.txt
+++ b/Source/Lib/Encoder/CMakeLists.txt
@@ -130,7 +130,9 @@ endif()
 set_target_properties(SvtAv1Enc PROPERTIES VERSION ${ENC_VERSION})
 set_target_properties(SvtAv1Enc PROPERTIES SOVERSION ${ENC_VERSION_MAJOR})
 target_link_libraries(SvtAv1Enc PUBLIC ${PLATFORM_LIBS})
-target_link_libraries(SvtAv1Enc PRIVATE cpuinfo_public)
+if(NOT COMPILE_C_ONLY AND HAVE_X86_PLATFORM)
+    target_link_libraries(SvtAv1Enc PRIVATE cpuinfo_public)
+endif()
 install(TARGETS SvtAv1Enc DESTINATION "${CMAKE_INSTALL_LIBDIR}")

 configure_file(pkg-config.pc.in ${CMAKE_BINARY_DIR}/SvtAv1Enc.pc @ONLY)
diff --git a/Source/Lib/Encoder/Codec/firstpass.c b/Source/Lib/Encoder/Codec/firstpass.c
index feb7a1fae7..80b7dd05d8 100644
--- a/Source/Lib/Encoder/Codec/firstpass.c
+++ b/Source/Lib/Encoder/Codec/firstpass.c
@@ -1189,8 +1189,8 @@ static void first_pass_setup_me_context(MotionEstimationContext_t *context_ptr,
     // set search method
     context_ptr->me_context_ptr->hme_search_method = SUB_SAD_SEARCH;
 
-    uint8_t *src_ptr = &(input_picture_ptr->buffer_y[buffer_index]);
 #ifdef ARCH_X86_64
+    uint8_t *src_ptr = &(input_picture_ptr->buffer_y[buffer_index]);
     //_MM_HINT_T0     //_MM_HINT_T1    //_MM_HINT_T2    //_MM_HINT_NTA
     uint32_t i;
     for (i = 0; i < sb_height; i++) {