Fix compile error for riscv scalar & simplify cmake cross build flow

1. Fix compile error when build riscv without using vector

2. Fix run_qemu.sh misused v=true for USE_RVV=OFF case

3. [cmake] Fix warning by rename TEST to UNIT_TEST
Warning log:
CMake Warning (dev) at CMakeLists.txt:57 (if):                                                                                                                                                                                                                  [54/1931]
  Policy CMP0064 is not set: Support new TEST if() operator.  Run "cmake
  --help-policy CMP0064" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  TEST will be interpreted as an operator when the policy is set to NEW.
  Since the policy is not set the OLD behavior will be used.
This warning is for project developers.  Use -Wno-dev to suppress it.

4. [cmake] Simplify logic for cross-build

Bug: libyuv:956

Change-Id: I120402fc7d6d86403e7d974180b81f4f9c663e36
Signed-off-by: Bruce Lai <bruce.lai@sifive.com>
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4486239
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>

5 files changed, 22 insertions, 24 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fe51ae75..7a4a1994 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 PROJECT ( YUV C CXX )	# "C" is required even for C++ projects
 CMAKE_MINIMUM_REQUIRED( VERSION 2.8.12 )
-OPTION( TEST "Built unit tests" OFF )
+OPTION( UNIT_TEST "Built unit tests" OFF )
 
 SET ( ly_base_dir	${PROJECT_SOURCE_DIR} )
 SET ( ly_src_dir	${ly_base_dir}/source )
@@ -52,25 +52,23 @@ if (JPEG_FOUND)
   add_definitions( -DHAVE_JPEG )
 endif()
 
-if(TEST)
-  if (NOT CMAKE_CROSSCOMPILING)
-    find_library(GTEST_LIBRARY gtest)
-    if(GTEST_LIBRARY STREQUAL "GTEST_LIBRARY-NOTFOUND")
-      set(GTEST_SRC_DIR /usr/src/gtest CACHE STRING "Location of gtest sources")
-      if(EXISTS ${GTEST_SRC_DIR}/src/gtest-all.cc)
-        message(STATUS "building gtest from sources in ${GTEST_SRC_DIR}")
-        set(gtest_sources ${GTEST_SRC_DIR}/src/gtest-all.cc)
-        add_library(gtest STATIC ${gtest_sources})
-        include_directories(${GTEST_SRC_DIR})
-        include_directories(${GTEST_SRC_DIR}/include)
-        set(GTEST_LIBRARY gtest)
-      else()
-        message(FATAL_ERROR "TEST is set but unable to find gtest library")
-      endif()
+if(UNIT_TEST)
+  find_library(GTEST_LIBRARY gtest)
+  if(GTEST_LIBRARY STREQUAL "GTEST_LIBRARY-NOTFOUND")
+    set(GTEST_SRC_DIR /usr/src/gtest CACHE STRING "Location of gtest sources")
+    if (CMAKE_CROSSCOMPILING)
+      set(GTEST_SRC_DIR third_party/googletest/src/googletest)
+    endif()
+    if(EXISTS ${GTEST_SRC_DIR}/src/gtest-all.cc)
+      message(STATUS "building gtest from sources in ${GTEST_SRC_DIR}")
+      set(gtest_sources ${GTEST_SRC_DIR}/src/gtest-all.cc)
+      add_library(gtest STATIC ${gtest_sources})
+      include_directories(${GTEST_SRC_DIR})
+      include_directories(${GTEST_SRC_DIR}/include)
+      set(GTEST_LIBRARY gtest)
+    else()
+      message(FATAL_ERROR "UNIT_TEST is set but unable to find gtest library")
     endif()
-  else()
-    add_subdirectory(third_party/googletest/src)
-    set(GTEST_LIBRARY gtest)
   endif()
 
   add_executable(libyuv_unittest ${ly_unittest_sources})
diff --git a/docs/getting_started.md b/docs/getting_started.md
index 37ffc747..b19f0009 100644
--- a/docs/getting_started.md
+++ b/docs/getting_started.md
@@ -231,7 +231,7 @@ If you don't have prebuilt clang and riscv64 qemu, run the script to download so
 After running script, clang & qemu are built in `build-toolchain-qemu/riscv-clang/` & `build-toolchain-qemu/riscv-qemu/`.
 
 ### Cross-compile for RISC-V target
-    cmake -B out/Release/ -DTEST=ON \
+    cmake -B out/Release/ -DUNIT_TEST=ON \
           -DCMAKE_BUILD_TYPE=Release \
           -DCMAKE_TOOLCHAIN_FILE="./riscv_script/riscv-clang.cmake" \
           -DTOOLCHAIN_PATH={TOOLCHAIN_PATH} \
diff --git a/include/libyuv/row.h b/include/libyuv/row.h
index 53a8d8a6..6e973bcf 100644
--- a/include/libyuv/row.h
+++ b/include/libyuv/row.h
@@ -757,7 +757,7 @@ extern "C" {
 #define HAS_RAWTOYJROW_LASX
 #endif
 
-#if !defined(LIBYUV_DISABLE_RVV) && defined(__riscv)
+#if !defined(LIBYUV_DISABLE_RVV) && defined(__riscv_vector)
 #define HAS_AB64TOARGBROW_RVV
 #define HAS_AR64TOARGBROW_RVV
 #define HAS_ARGBTOAB64ROW_RVV
diff --git a/riscv_script/run_qemu.sh b/riscv_script/run_qemu.sh
index c492f3f8..080af3b1 100755
--- a/riscv_script/run_qemu.sh
+++ b/riscv_script/run_qemu.sh
@@ -9,7 +9,7 @@ QEMU_PREFIX_PATH="${QEMU_PREFIX_PATH:-../../build-toolchain-qemu/riscv-qemu/}"
 if [ "${USE_RVV}" = "ON" ];then
   QEMU_OPTION="-cpu rv64,zba=true,zbb=true,zbc=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0 -L ${TOOLCHAIN_PATH}/sysroot"
 else
-  QEMU_OPTION="-cpu rv64,zba=true,zbb=true,zbc=true,zbs=true,v=true -L ${TOOLCHAIN_PATH}/sysroot"
+  QEMU_OPTION="-cpu rv64,zba=true,zbb=true,zbc=true,zbs=true -L ${TOOLCHAIN_PATH}/sysroot"
 fi
 
 $QEMU_PREFIX_PATH/bin/qemu-riscv64 $QEMU_OPTION $@
diff --git a/source/row_rvv.cc b/source/row_rvv.cc
index 0ca4740b..956ed9f9 100644
--- a/source/row_rvv.cc
+++ b/source/row_rvv.cc
@@ -19,7 +19,7 @@
 
 #include "libyuv/row.h"
 
-#if !defined(LIBYUV_DISABLE_RVV) && defined(__riscv)
+#if !defined(LIBYUV_DISABLE_RVV) && defined(__riscv_vector)
 #include <riscv_vector.h>
 
 #ifdef __cplusplus
@@ -323,4 +323,4 @@ void MergeXRGBRow_RVV(const uint8_t* src_r,
 }  // namespace libyuv
 #endif
 
-#endif  // !defined(LIBYUV_DISABLE_RVV) && defined(__riscv)
+#endif  // !defined(LIBYUV_DISABLE_RVV) && defined(__riscv_vector)