cmake: fix RISC-V toolchains

- RVV options are moved to configuration scripts instead of toolchains

cmake/OpenCVCompilerOptimizations.cmake

@@ -20,6 +20,9 @@
 # VSX  (always available on Power8)
 # VSX3 (always available on Power9)
 
+# RISC-V arch:
+# RVV
+
 # CPU_{opt}_SUPPORTED=ON/OFF - compiler support (possibly with additional flag)
 # CPU_{opt}_IMPLIES=<list>
 # CPU_{opt}_FORCE=<list> - subset of "implies" list
@@ -104,8 +107,6 @@ ocv_optimization_process_obsolete_option(ENABLE_NEON NEON OFF)
 
 ocv_optimization_process_obsolete_option(ENABLE_VSX VSX ON)
 
-ocv_optimization_process_obsolete_option(ENABLE_RVV RVV OFF)
-
 macro(ocv_is_optimization_in_list resultvar check_opt)
   set(__checked "")
   set(__queue ${ARGN})
@@ -375,11 +376,18 @@ elseif(PPC64LE)
   set(CPU_BASELINE "VSX" CACHE STRING "${HELP_CPU_BASELINE}")
 
 elseif(RISCV)
+  option(RISCV_RVV_SCALABLE "Use scalable RVV API on RISC-V" ON)
+
   ocv_update(CPU_RVV_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_rvv.cpp")
   ocv_update(CPU_KNOWN_OPTIMIZATIONS "RVV")
-  ocv_update(CPU_RVV_FLAGS_ON "")
-  set(CPU_DISPATCH "RVV" CACHE STRING "${HELP_CPU_DISPATCH}")
-  set(CPU_BASELINE "RVV" CACHE STRING "${HELP_CPU_BASELINE}")
+  ocv_update(CPU_RVV_FLAGS_ON "-march=rv64gcv")
+  if(RISCV_RVV_SCALABLE)
+    set(CPU_RVV_FLAGS_ON "${CPU_RVV_FLAGS_ON} -DCV_RVV_SCALABLE")
+  endif()
+  ocv_update(CPU_RVV_FLAGS_CONFLICT "-march=[^ ]*")
+
+  set(CPU_DISPATCH "" CACHE STRING "${HELP_CPU_DISPATCH}")
+  set(CPU_BASELINE "DETECT" CACHE STRING "${HELP_CPU_BASELINE}")
 
 elseif(LOONGARCH64)
   ocv_update(CPU_LASX_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_lasx.cpp")

modules/core/include/opencv2/core/hal/intrin.hpp

@@ -235,11 +235,12 @@ using namespace CV_CPU_OPTIMIZATION_HAL_NAMESPACE;
 #elif CV_WASM_SIMD && !defined(CV_FORCE_SIMD128_CPP)
 #include "opencv2/core/hal/intrin_wasm.hpp"
 
-#elif CV_RVV && !defined(CV_FORCE_SIMD128_CPP) && !defined(CV_RVV_SCALABLE)
-#include "opencv2/core/hal/intrin_rvv.hpp"
-
-#elif CV_RVV && !defined(CV_FORCE_SIMD128_CPP) && CV_RVV_SCALABLE
+#elif CV_RVV && !defined(CV_FORCE_SIMD128_CPP)
+#if defined(CV_RVV_SCALABLE)
 #include "opencv2/core/hal/intrin_rvv_scalable.hpp"
+#else
+#include "opencv2/core/hal/intrin_rvv.hpp"
+#endif
 
 #elif CV_LASX
     #if !defined(CV_FORCE_SIMD128_CPP)

platforms/linux/riscv.toolchain.cmake → platforms/linux/riscv-gnu.toolchain.cmake

-cmake_minimum_required(VERSION 3.5)
-
 if(COMMAND toolchain_save_config)
   return() # prevent recursive call
 endif()
 
 set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_SYSTEM_VERSION 1)
+if(NOT DEFINED CMAKE_SYSTEM_PROCESSOR)
+  set(CMAKE_SYSTEM_PROCESSOR riscv64)
+else()
+  #message("CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR}")
+endif()
 
 include("${CMAKE_CURRENT_LIST_DIR}/gnu.toolchain.cmake")
 
-MESSAGE(STATUS "Debug: CMAKE_C_COMPILER: ${CMAKE_C_COMPILER}")
-
 if(NOT "x${GCC_COMPILER_VERSION}" STREQUAL "x")
   set(__GCC_VER_SUFFIX "-${GCC_COMPILER_VERSION}")
 endif()
 
+if(NOT DEFINED GNU_MACHINE)
+  set(GNU_MACHINE riscv64-unknown-linux-gnu CACHE STRING "GNU compiler triple")
+endif()
+
+if(NOT DEFINED TOOLCHAIN_COMPILER_LOCATION_HINT)
+  set(TOOLCHAIN_COMPILER_LOCATION_HINT PATHS /opt/riscv/bin ENV PATH)
+endif()
+
 if(NOT DEFINED CMAKE_C_COMPILER)
-  MESSAGE("Looking for compler.. ${GNU_MACHINE}-gcc${__GCC_VER_SUFFIX}")
-  find_program(CMAKE_C_COMPILER NAMES ${GNU_MACHINE}-gcc${__GCC_VER_SUFFIX})
+  find_program(CMAKE_C_COMPILER NAMES ${GNU_MACHINE}-gcc${__GCC_VER_SUFFIX} ${TOOLCHAIN_COMPILER_LOCATION_HINT})
 else()
   #message(WARNING "CMAKE_C_COMPILER=${CMAKE_C_COMPILER} is defined")
 endif()
 if(NOT DEFINED CMAKE_CXX_COMPILER)
-  find_program(CMAKE_CXX_COMPILER NAMES ${GNU_MACHINE}-g++${__GCC_VER_SUFFIX})
+  find_program(CMAKE_CXX_COMPILER NAMES ${GNU_MACHINE}-g++${__GCC_VER_SUFFIX} ${TOOLCHAIN_COMPILER_LOCATION_HINT})
 else()
   #message(WARNING "CMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} is defined")
 endif()
 if(NOT DEFINED CMAKE_LINKER)
-  find_program(CMAKE_LINKER NAMES ${GNU_MACHINE}-ld${__GCC_VER_SUFFIX} ${GNU_MACHINE}-ld)
+  find_program(CMAKE_LINKER NAMES ${GNU_MACHINE}-ld${__GCC_VER_SUFFIX} ${GNU_MACHINE}-ld ${TOOLCHAIN_COMPILER_LOCATION_HINT})
 else()
   #message(WARNING "CMAKE_LINKER=${CMAKE_LINKER} is defined")
 endif()
 if(NOT DEFINED CMAKE_AR)
-  find_program(CMAKE_AR NAMES ${GNU_MACHINE}-ar${__GCC_VER_SUFFIX} ${GNU_MACHINE}-ar)
+  find_program(CMAKE_AR NAMES ${GNU_MACHINE}-ar${__GCC_VER_SUFFIX} ${GNU_MACHINE}-ar ${TOOLCHAIN_COMPILER_LOCATION_HINT})
 else()
   #message(WARNING "CMAKE_AR=${CMAKE_AR} is defined")
 endif()
 
-if(NOT DEFINED RISCV_LINUX_SYSROOT AND DEFINED GNU_MACHINE)
-  set(RISCV_LINUX_SYSROOT /usr/${GNU_MACHINE})
-endif()
-
-if(NOT DEFINED CMAKE_CXX_FLAGS)
-  set(CMAKE_CXX_FLAGS           "${CMAKE_CXX_FLAGS} -fdata-sections -Wa,--noexecstack -fsigned-char -Wno-psabi")
-  set(CMAKE_C_FLAGS             "${CMAKE_C_FLAGS} -fdata-sections -Wa,--noexecstack -fsigned-char -Wno-psabi")
-  set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,nocopyreloc")
-
-  set(RISCV_LINKER_FLAGS "-Wl,--no-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
-  set(CMAKE_SHARED_LINKER_FLAGS "${RISCV_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}")
-  set(CMAKE_MODULE_LINKER_FLAGS "${RISCV_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}")
-  set(CMAKE_EXE_LINKER_FLAGS    "${RISCV_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}")
-else()
-  message(STATUS "User provided flags are used instead of defaults")
+if(NOT DEFINED RISCV_SYSROOT)
+  get_filename_component(_base_dir ${CMAKE_C_COMPILER} DIRECTORY)
+  get_filename_component(_base_dir ${_base_dir} DIRECTORY)
+  set(RISCV_SYSROOT ${_base_dir}/sysroot CACHE PATH "RISC-V sysroot")
 endif()
 
-set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} ${RISCV_LINUX_SYSROOT})
+set(CMAKE_SYSROOT "${RISCV_SYSROOT}")
+set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} ${RISCV_SYSROOT})
 
 set(TOOLCHAIN_CONFIG_VARS ${TOOLCHAIN_CONFIG_VARS}
-    RISCV_LINUX_SYSROOT
+    RISCV_SYSROOT
 )
 toolchain_save_config()

platforms/linux/riscv64-clang.toolchain.cmake

@@ -17,15 +17,8 @@ set(CMAKE_ASM_COMPILER_TARGET ${CLANG_TARGET_TRIPLE})
 # Don't run the linker on compiler check
 set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
 
-set(CMAKE_C_FLAGS "-march=rv64gcv --gcc-toolchain=${RISCV_GCC_INSTALL_ROOT} -w ${CMAKE_C_FLAGS}")
-set(CMAKE_CXX_FLAGS "-march=rv64gcv --gcc-toolchain=${RISCV_GCC_INSTALL_ROOT} -w ${CXX_FLAGS}")
-
-set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}  -O2")
-set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}  -O2")
-OPTION(RISCV_RVV_SCALABLE "Use scalable RVV API on RISC-V" ON) # Enabled by default
-IF(RISCV_RVV_SCALABLE)
-    ADD_DEFINITIONS(-DCV_RVV_SCALABLE)
-ENDIF()
+set(CMAKE_C_FLAGS "-march=rv64gc --gcc-toolchain=${RISCV_GCC_INSTALL_ROOT} -w ${CMAKE_C_FLAGS}")
+set(CMAKE_CXX_FLAGS "-march=rv64gc --gcc-toolchain=${RISCV_GCC_INSTALL_ROOT} -w ${CXX_FLAGS}")
 
 set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

platforms/linux/riscv64-gcc.toolchain.cmake

 set(CMAKE_SYSTEM_NAME Linux)
-set(CMAKE_SYSTEM_PROCESSOR riscv64)
+set(CMAKE_SYSTEM_VERSION 1)
+set(GNU_MACHINE riscv64-unknown-linux-gnu CACHE STRING "GNU compiler triple")
 
-if(NOT DEFINED CMAKE_C_COMPILER)
-  find_program(CMAKE_C_COMPILER NAMES riscv64-unknown-linux-gnu-gcc
-                                PATHS /opt/riscv/bin ENV PATH)
+if(NOT DEFINED CMAKE_CXX_FLAGS)  # guards toolchain multiple calls
+  set(CMAKE_C_FLAGS "-march=rv64gc")
+  set(CMAKE_CXX_FLAGS "-march=rv64gc")
 endif()
 
-if(NOT DEFINED CMAKE_CXX_COMPILER)
-  find_program(CMAKE_CXX_COMPILER NAMES riscv64-unknown-linux-gnu-g++
-                                  PATHS /opt/riscv/bin ENV PATH)
-endif()
-
-get_filename_component(RISCV_GCC_INSTALL_ROOT ${CMAKE_C_COMPILER} DIRECTORY)
-get_filename_component(RISCV_GCC_INSTALL_ROOT ${RISCV_GCC_INSTALL_ROOT} DIRECTORY)
-
-set(CMAKE_SYSROOT ${RISCV_GCC_INSTALL_ROOT}/sysroot CACHE PATH "RISC-V sysroot")
-
-# Don't run the linker on compiler check
-set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
-
-set(CMAKE_C_FLAGS "-march=rv64gcv_zfh ${CMAKE_C_FLAGS}")
-set(CMAKE_CXX_FLAGS "-march=rv64gcv_zfh ${CXX_FLAGS}")
-
-set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
\ No newline at end of file
+include("${CMAKE_CURRENT_LIST_DIR}/riscv-gnu.toolchain.cmake")

platforms/linux/riscv64-gnu.toolchain.cmake

-set(CMAKE_SYSTEM_PROCESSOR riscv64)
-set(GNU_MACHINE riscv64-linux-gnu CACHE STRING "GNU compiler triple")
-set(GCC_COMPILER_VERSION "" CACHE STRING "GCC Compiler version")
-
-include("${CMAKE_CURRENT_LIST_DIR}/riscv.toolchain.cmake")