From: A. Maitland Bottoms <bottoms@debian.org>
Date: Tue, 1 Dec 2020 16:29:12 +0000 (-0500)
Subject: [PATCH] cpu_features CMake option
X-Git-Tag: archive/raspbian/2.4.0-3+rpi1^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=af80cac4735c0fdfd8d026ef4eb91dde041e6f15;p=volk.git

[PATCH] cpu_features CMake option

Make use of cpu_features a CMake option with sensible defaults per arch.
(avoiding CMake failures of cpu_features for unknown architectures)

Gbp-Pq: Name cpu_features-CMake-option
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7618494..ac89b4d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,14 +114,25 @@ endif(MSVC)
 # Dependencies setup
 ########################################################################
 
-# cpu_features
-set(BUILD_PIC ON CACHE BOOL
+# cpu_features - sensible defaults, user settable option
+if(CMAKE_SYSTEM_PROCESSOR MATCHES
+    "(^mips)|(^arm)|(^aarch64)|(x86_64)|(AMD64|amd64)|(^i.86$)|(^powerpc)|(^ppc)")
+  option(VOLK_CPU_FEATURES "Volk uses cpu_features" ON)
+else()
+  option(VOLK_CPU_FEATURES "Volk uses cpu_features" OFF)
+endif()
+if (VOLK_CPU_FEATURES)
+  message(STATUS "Building Volk with cpu_features")
+  set(BUILD_PIC ON CACHE BOOL
     "Build cpu_features with Position Independent Code (PIC)."
     FORCE)
-set(BUILD_SHARED_LIBS_SAVED "${BUILD_SHARED_LIBS}")
-set(BUILD_SHARED_LIBS OFF)
-add_subdirectory(cpu_features)
-set(BUILD_SHARED_LIBS "${BUILD_SHARED_LIBS_SAVED}")
+  set(BUILD_SHARED_LIBS_SAVED "${BUILD_SHARED_LIBS}")
+  set(BUILD_SHARED_LIBS OFF)
+  add_subdirectory(cpu_features)
+  set(BUILD_SHARED_LIBS "${BUILD_SHARED_LIBS_SAVED}")
+else()
+  message(STATUS "Building Volk without cpu_features")
+endif()
 
 # Python
 include(VolkPython) #sets PYTHON_EXECUTABLE and PYTHON_DASH_B
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 7458530..9fbdb92 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -511,10 +511,15 @@ target_include_directories(volk_obj
     PRIVATE $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
     PRIVATE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
     PRIVATE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/kernels>
-    PRIVATE $<TARGET_PROPERTY:cpu_features,INTERFACE_INCLUDE_DIRECTORIES>
     PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
     PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
 )
+if(VOLK_CPU_FEATURES)
+  set_source_files_properties(volk_cpu.c PROPERTIES COMPILE_DEFINITIONS "VOLK_CPU_FEATURES=1")
+  target_include_directories(volk_obj
+    PRIVATE $<TARGET_PROPERTY:cpu_features,INTERFACE_INCLUDE_DIRECTORIES>
+)
+endif()
 
 #Configure object target properties
 if(NOT MSVC)
@@ -530,7 +535,10 @@ endif()
 #include directories is taken as provided; it -might- matter, but
 #probably doesn't.
 add_library(volk SHARED $<TARGET_OBJECTS:volk_obj>)
-target_link_libraries(volk PUBLIC ${volk_libraries} PRIVATE cpu_features)
+target_link_libraries(volk PUBLIC ${volk_libraries})
+if(VOLK_CPU_FEATURES)
+  target_link_libraries(volk PRIVATE cpu_features)
+endif()
 target_include_directories(volk
     PUBLIC $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
     PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
diff --git a/tmpl/volk_cpu.tmpl.c b/tmpl/volk_cpu.tmpl.c
index 1266250..f879eb6 100644
--- a/tmpl/volk_cpu.tmpl.c
+++ b/tmpl/volk_cpu.tmpl.c
@@ -25,6 +25,7 @@
 #include <string.h>
 
 
+#if defined(VOLK_CPU_FEATURES)
 #include "cpu_features_macros.h"
 #if defined(CPU_FEATURES_ARCH_X86)
 #include "cpuinfo_x86.h"
@@ -42,6 +43,7 @@
 #if defined(__cplusplus)
 using namespace cpu_features;
 #endif
+#endif
 
 
 struct VOLK_CPU volk_cpu;