From 4a0dc8da7c919b964b21c002ec8ffa9e5c53a12b Mon Sep 17 00:00:00 2001
From: wuying39 <921169248@qq.com>
Date: Tue, 2 Sep 2025 17:18:11 +0800
Subject: [PATCH] modify the build file and code to compatible with older
 version compilers

---
 CMakeLists.txt         | 27 ++++++++++++++++++++++-----
 pmu/dump_perf_data.cpp |  2 +-
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 95ced18..78cb57c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,12 +35,29 @@ endif()
 
 set(TOP_DIR ${PROJECT_SOURCE_DIR})
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -funroll-loops -fno-plt")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -funroll-loops -fno-plt ")
+include(CheckCCompilerFlag)
+include(CheckCXXCompilerFlag)
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -funroll-loops")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -funroll-loops")
 
-if (CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "^(arm|aarch64)")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8.2-a")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  -march=armv8.2-a")
+check_c_compiler_flag("-fno-plt" C_SUPPORTS_NO_PLT)
+if(C_SUPPORTS_NO_PLT)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-plt")
+endif()
+check_cxx_compiler_flag("-fno-plt" CXX_SUPPORTS_NO_PLT)
+if(CXX_SUPPORTS_NO_PLT)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-plt")
+endif()
+
+if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "^(arm|aarch64)")
+    check_c_compiler_flag("-march=armv8.2-a" C_SUPPORTS_ARM_ARCH)
+    if(C_SUPPORTS_ARM_ARCH)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8.2-a")
+    endif()
+    check_cxx_compiler_flag("-march=armv8.2-a" CXX_SUPPORTS_ARM_ARCH)
+    if(CXX_SUPPORTS_ARM_ARCH)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8.2-a")
+    endif()
 endif()
 
 message("TOP_DIR is ${TOP_DIR}")
diff --git a/pmu/dump_perf_data.cpp b/pmu/dump_perf_data.cpp
index e6e16fd..ef1dd22 100644
--- a/pmu/dump_perf_data.cpp
+++ b/pmu/dump_perf_data.cpp
@@ -620,7 +620,7 @@ private:
 
     unsigned idHdrSize = 0;
     const char *path = nullptr;
-    PerfFileHeader ph = {0};
+    PerfFileHeader ph = {};
     int fd = 0;
     map<string, long> evt2id;
     set<string> modules;
-- 
Gitee