| id | title | desc | updated | created |
|---|---|---|---|---|
7va3muon7q66smpplisot4t |
Compile_analysis |
1699600171213 |
1695610893045 |
- analysis cost time of compile
- c++ 符号表
- cppreference.initialization
- csdn-查看内存布局的方法
- blog-程序员自我修养_编译链接
- blog-从四个问题透析Linux下C++编译&链接
- blog-c++ 内存模型
- add compile option:
-save-temps, to generate *.i *.ii and *.s file on build dir
add_definitions(-save-temps)compile can't pass that undefined refer on spdlog when link stage, but same lib module and impl code, just replace the project to reference
/home/xjf2613/code-space/qnx/pe-board_sdk_service/src/module/m_samba/lib/libsmbclient.so: warning: The 'mktemp' function is dangerous. Use 'mkstemp' instead.
CMakeFiles/main_service_qnx.dir/main.cpp.o: In function `spdlog::sinks::gf_rotating_file_sink<std::__1::mutex>::sink_it_(spdlog::details::log_msg const&)':
/home/xjf2613/code-space/qnx/pe-board_sdk_service/src/module/m_spdlog/impl/gf_rotating_file_sink-inl.h:166: undefined reference to `spdlog::details::file_helper::write(fmt::v10::basic_memory_buffer<char, 250ul, std::__1::allocator<char> > const&)'
collect2: error: ld returned 1 exit status
o_main_service/CMakeFiles/main_service_qnx.dir/build.make:369: recipe for target '/home/xjf2613/code-space/qnx/pe-board_sdk_service/out/main_service_qnx/main_service_qnx' failed
make[2]: *** [/home/xjf2613/code-space/qnx/pe-board_sdk_service/out/main_service_qnx/main_service_qnx] Error 1
CMakeFiles/Makefile2:367: recipe for target 'o_main_service/CMakeFiles/main_service_qnx.dir/all' failed
make[1]: *** [o_main_service/CMakeFiles/main_service_qnx.dir/all] Error 2
Makefile:90: recipe for target 'all' failedon cmakelist using the diff compile macro which used inside the spdlog
#right modify
set(CMAKE_CXX_STANDARD 11)
ADD_DEFINITIONS(-std=gnu++11)
add_definitions(-w)
# add_definitions(-DSPDLOG_COMPILED_LIB)compiler tips redefined function, but there is used inline for function
In file included from /home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/cfg/testbed_to_server/toml_testbed_to_server.h:2:0,
from /home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/test_toml_macro.cpp:5:
/home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/my_toml_macro.h: In function 'int patch_toml_value(const value&, toml::value&)':
/home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/my_toml_macro.h:36:17: error: redefinition of 'int patch_toml_value(const value&, toml::value&)'
inline int patch_toml_value(const toml::value& cmp_v, toml::value& out_v) {
^
In file included from /home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/test_toml_macro.cpp:4:0:
/home/xjf2613/code-space/qnx/pe-tool_hezhong_ep37/src/target/o_toml_test/my_toml_macro.h:36:17: note: 'int patch_toml_value(const value&, toml::value&)' previously defined here
inline int patch_toml_value(const toml::value& cmp_v, toml::value& out_v) {
^there is no compile once include macro for the header file which defined the function Resulting in multiple code definitions being generated in the current file
if you define one function and copy it in the same file, even if they are same, in the view of compiler, it doesn't to contrast the function content if repeat, just check if existence same function signature. if not, will report redefinition error
the effect of inline keyword is allow existence of one function definition in each compilation unit
- redefinition error common reason 1.no using inline, the function defined in multiple compilation unit 2.using inline, the header file not include prevent duplicate include macro