Expose CPPSTD configuration

Signed-off-by: yhmo <yihua.mo@zilliz.com>

Author: yhmo

CMakeLists.txt

@@ -20,7 +20,7 @@ project(milvus_sdk LANGUAGES CXX)
 set(CMAKE_POLICY_VERSION_MINIMUM 3.5)
 set(CMAKE_VERBOSE_MAKEFILE OFF)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard used to build Milvus C++ SDK")
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

conanfile.py

@@ -65,12 +65,6 @@ def validate(self):
         # The project currently builds with C++14.
         check_min_cppstd(self, 14)
 
-    def configure(self):
-        # Ensure dependency graph variants match the project's C++ standard.
-        # (Without this, Conan may resolve packages for gnu17 and then fail to
-        # find compatible binaries.)
-        self.settings.compiler.cppstd = "14"
-
     def generate(self):
         tc = CMakeToolchain(self)
 

scripts/build.sh

@@ -30,7 +30,7 @@ DO_INSTALL="OFF"
 CMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX:-/usr/local}
 BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS:-ON}
 BUILD_FROM_CONAN="ON"
-
+CPPSTD=${CPPSTD:-14}
 
 JOBS="${JOBS:-$(nproc 2>/dev/null || sysctl -n hw.logicalcpu 2>/dev/null || echo 3)}"
 if [ ${JOBS} -lt 3 ] ; then
@@ -133,7 +133,6 @@ if [[ "${BUILD_FROM_CONAN}" == "ON" ]]; then
   # Dependencies must come from Conan; external gRPC is not supported.
   # Users can override the Conan executable via CONAN.
   CONAN=${CONAN:-conan}
-  CPPSTD=${CPPSTD:-14}
   CONAN_LIBCXX_SETTINGS=()
   if [[ -n "${CONAN_LIBCXX:-}" ]]; then
     CONAN_LIBCXX_SETTINGS+=("-s" "compiler.libcxx=${CONAN_LIBCXX}")
@@ -229,6 +228,7 @@ esac
 CMAKE_CMD="cmake \
 -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN_FILE} \
 -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
+-DCMAKE_CXX_STANDARD=${CPPSTD} \
 -DMILVUS_BUILD_TEST=${BUILD_TEST} \
 -DMILVUS_BUILD_COVERAGE=${BUILD_COVERAGE} \
 -DMILVUS_BUILD_EXAMPLES=${CMAKE_BUILD_EXAMPLES} \