pref(build): 尝试解决全局构造问题，此版本现象：

- riscv 非 static 对象可以正常构造，static 对象会在 cpp_init 死循环，原因未知 - x8_64 只要执行 cpp_init 重的 f 就会 GP，开启 -no-pie 会直接进不去 elf Signed-off-by: Zone.N <[email protected]>
MRNIU · Apr 28, 2024 · 8c865a1 · 8c865a1
1 parent bfb8fd1
commit 8c865a1
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Showing 4 changed files with 13 additions and 3 deletions.
diff --git a/cmake/compile_config.cmake b/cmake/compile_config.cmake
@@ -113,6 +113,7 @@ list(APPEND DEFAULT_KERNEL_COMPILE_OPTIONS
         $<$<STREQUAL:${CMAKE_SYSTEM_PROCESSOR},x86_64>:
         # 禁用 red-zone
         -mno-red-zone
+        # 生成位置无关代码
         -fPIC
         >
 

diff --git a/src/kernel/CMakeLists.txt b/src/kernel/CMakeLists.txt
@@ -56,6 +56,15 @@ add_dependencies(kernel
 set_target_properties(kernel PROPERTIES PREFIX "")
 set_target_properties(kernel PROPERTIES OUTPUT_NAME ${KERNEL_ELF_OUTPUT_NAME})
 
+## 获取 crt 文件位置
+#execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crti.o OUTPUT_VARIABLE CRTI_O OUTPUT_STRIP_TRAILING_WHITESPACE)
+#execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crtbegin.o OUTPUT_VARIABLE CRTBEGIN_O OUTPUT_STRIP_TRAILING_WHITESPACE)
+#execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crtend.o OUTPUT_VARIABLE CRTEND_O OUTPUT_STRIP_TRAILING_WHITESPACE)
+#execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crtn.o OUTPUT_VARIABLE CRTN_O OUTPUT_STRIP_TRAILING_WHITESPACE)
+#
+## 设置链接指令
+#set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_LINKER} <CMAKE_C_LINK_FLAGS> <FLAGS> <LINK_FLAGS> ${CRTI_O} ${CRTBEGIN_O} <OBJECTS> <LINK_LIBRARIES> ${CRTEND_O} ${CRTN_O} -o <TARGET>")
+
 # readelf -a
 readelf_a(kernel)
 

diff --git a/src/kernel/libcxx/libcxx.cpp b/src/kernel/libcxx/libcxx.cpp
@@ -26,7 +26,7 @@ extern ctor_t __init_array_end[];
 void cpp_init(void) {
   ctor_t* f;
   for (f = __init_array_start; f < __init_array_end; f++) {
-    (*f)();
+//    (*f)();
   }
 }
 

diff --git a/src/kernel/main.cpp b/src/kernel/main.cpp
@@ -33,14 +33,14 @@ class aaa {
 };
 
 auto class_a = aaa();
-auto class_a2 = aaa(1);
+static auto class_a2 = aaa(1);
 
 int main(int _argc, char** _argv) {
   // 架构相关初始化
   auto arch_init_ret = arch_init(_argc, reinterpret_cast<uint8_t**>(_argv));
 
   printf("class_a.a: %d\n", class_a.a);
-  printf("class_a2.a: %d\n", class_a2.a);
+//  printf("class_a2.a: %d\n", class_a2.a);
 
   printf("------\n");