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overlook.cmake
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overlook.cmake
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###############################################################
#
# Overlook: a cmake plugin for safer c/c++ programming.
#
# Author: Zhuo Zhang <[email protected]>
# Homepage: https://github.com/zchrissirhcz/cmake_tools
#
###############################################################
cmake_minimum_required(VERSION 3.20)
include_guard()
set(OVERLOOK "${CMAKE_CURRENT_LIST_FILE}")
set(OVERLOOK_VERSION "2024.06.12")
option(OVERLOOK_GLOBAL "Apply overlook globally?" ON)
set(OVERLOOK_C_COMPILE_OPTIONS)
set(OVERLOOK_CXX_COMPILE_OPTIONS)
# Print overlook information
message("----------------------------------------------------------")
message(" Overlook: a cmake tool for safer C/C++ programming ")
message(" Author : Zhuo Zhang ([email protected]) ")
message(" Homepage: https://github.com/zchrissirhcz/cmake_tools ")
message(" Version : ${OVERLOOK_VERSION} ")
message("----------------------------------------------------------")
if(CMAKE_C_COMPILER_ID)
set(OVERLOOK_WITH_C TRUE)
else()
set(OVERLOOK_WITH_C FALSE)
endif()
if(CMAKE_CXX_COMPILER_ID)
set(OVERLOOK_WITH_CXX TRUE)
else()
set(OVERLOOK_WITH_CXX FALSE)
endif()
# Project LANGUAGE not including C and CXX so we return
if((NOT OVERLOOK_WITH_C) AND (NOT OVERLOOK_WITH_CXX))
overlook_warn("Neither C nor CXX compiler available. No OVERLOOK C/C++ flags will be set")
overlook_warn("You may specify C and CXX in `project()` command")
return()
endif()
# rule0: don't ignore all that warnings
# If `-w` specified for GCC/Clang, report an error
if((CMAKE_C_COMPILER_ID MATCHES "GNU") OR (CMAKE_C_COMPILER_ID MATCHES "Clang"))
get_directory_property(overlook_detected_global_compile_options COMPILE_OPTIONS)
message("Detected Global Compile Options: ${overlook_detected_global_compile_options}")
string(REGEX MATCH "-w" ignore_all_warnings "${overlook_detected_global_compile_options}" )
if(ignore_all_warnings)
overlook_error("Found `-w` compile options, it ignore all warnings. Please remove it (in `add_compile_options)`")
endif()
endif()
#--------------------------------------------------------------------------------
# Function return value related
#--------------------------------------------------------------------------------
# rule1: calls a function when it is not declared. C compiler doesn't treat it an error, but we do.
# 函数没有声明就使用, C编译器默认不报错，改为强制报错
# 解决bug: 地址截断; 内存泄漏
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4013)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4013)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-function-declaration)
if(CMAKE_CXX_COMPILER_VERSION LESS 9.1)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-function-declaration)
endif()
if(CMAKE_C_COMPILER_VERSION GREATER_EQUAL 11.1)
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=builtin-declaration-mismatch)
endif()
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-function-declaration)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-function-declaration)
endif()
# rule2: 函数虽然有声明，但是声明不完整，没有写出返回值类型，C编译器默认不报错，改为强制报错
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4431)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4431)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-int)
if(CMAKE_CXX_COMPILER_VERSION LESS 9.1)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-int)
endif()
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-int)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-int)
endif()
# rule4: when missing return value for non-void function, C/C++ compiler treat it as UB and not report error, we treat it as error.
# it may cause crash, or just return un-expected result, depends on the compiler and the code you write
# 函数应该有返回值但没有 return 返回值，或不是所有路径都有返回值，C和C++编译器默认不报错，改为强制报错
# 解决bug: lane detect; vpdt for循环无法跳出(android输出trap); lane calib库读取到随机值导致获取非法格式asvl, 开asan则表现为读取NULL指针
# -O3时输出内容和其他优化等级不一样 (from 三老师)
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4716 /we4715)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4716 /we4715)
else()
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=return-type)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=return-type)
endif()
# rule30: 所有的控件路径(if/else)必须都有返回值
# NDK21 Clang / Linux Clang/GCC/G++ 默认都报 error
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4715)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4715)
endif()
# rule6: 函数不应该返回局部变量的地址
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4172)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4172)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=return-local-addr)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=return-local-addr)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=return-stack-address)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=return-stack-address)
endif()
#--------------------------------------------------------------------------------
# Function argument/parameter, type conversion/casting related
#--------------------------------------------------------------------------------
# rule12: 函数声明中的参数列表和定义中不一样。在 MSVC C 下为警告, Linux Clang 下报错
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4029)
endif()
# rule13: 实参太多, 比函数定义或声明中的要多。只在MSVC C 下为警告, Linux Clang下报错
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4020)
endif()
# rule14: 避免 void* 类型的指针参参与算术运算
# MSVC C/C++ 默认会报错, Linux gcc 不报 warning 和 error, Linux g++ 只报 warning
# Linux 下 Clang 开 -Wpedentric 才报 warning, Clang++ 报 error
if(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=pointer-arith)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=pointer-arith)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=pointer-arith)
endif()
# rule3: 指针类型不兼容，C编译器默认不报错，改为强制报错
# 解决bug: crash或结果异常
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4133)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4133)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
if(CMAKE_CXX_COMPILER_VERSION GREATER 4.8) # gcc/g++ 4.8.3 not ok
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=incompatible-pointer-types)
if(CMAKE_CXX_COMPILER_VERSION LESS 9.1)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=incompatible-pointer-types)
endif()
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=incompatible-pointer-types)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=incompatible-pointer-types)
endif()
# rule10: 避免把 int 指针赋值给 int 类型变量
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4047)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4047)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
if(CMAKE_CXX_COMPILER_VERSION GREATER 4.8)
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=int-conversion)
if(CMAKE_CXX_COMPILER_VERSION LESS 9.1)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=int-conversion)
endif()
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=int-conversion)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=int-conversion)
endif()
# rule8: printf 等语句中的格式串和实参类型不匹配，要避免
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4477)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4477)
else()
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=format)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=format)
endif()
# rule17: 形参与声明不同。场景：静态库(.h/.c)，集成时换库但没换头文件，且函数形参有变化（类型或数量）
# 只报 warning 不报 error。仅 VS 出现
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4028)
endif()
# rule21: “类型强制转换”: 例如从 int 转换到更大的 void*
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4312)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4312)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=int-to-pointer-cast)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=int-to-pointer-cast)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=int-to-pointer-cast)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=int-to-pointer-cast)
endif()
# rule23: 类函数宏的调用 参数过多
# VC/VC++ 报警告。Linux 下的 GCC/Clang 报 error
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4002)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4002)
endif()
# rule24: 类函数宏的调用 参数不足
# VC/VC++ 同时会报 error C2059
# Linux GCC/Clang 直接报错
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4003)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4003)
endif()
#--------------------------------------------------------------------------------
# Initialization, memory release related
#--------------------------------------------------------------------------------
# rule7: 变量没初始化就使用，要避免
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4700 /we26495)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4700 /we26495)
else()
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=uninitialized)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=uninitialized)
endif()
# rule11: 检查数组下标越界访问
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we6201 /we6386 /we4789)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we6201 /we6386 /we4789)
else()
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=array-bounds)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=array-bounds)
endif()
# rule16: 释放非堆内存
# TODO: 检查 MSVC
# Linux Clang8.0 无法检测到
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=free-nonheap-object)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=free-nonheap-object)
endif()
# rule32: 用 memset 等 C 函数设置 非 POD class 对象
# Linux下, GCC9.3 能发现此问题, 但clang10 不能发现
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
if(CMAKE_CXX_COMPILER_VERSION GREATER 7.5)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=class-memaccess)
endif()
endif()
# rule15: 避免符号重复定义（变量对应的强弱符号）。只在 C 中出现。
# 暂时没找到 MSVC 的对应编译选项
if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -fno-common)
endif()
#--------------------------------------------------------------------------------
# Pre-compilation directive related
#--------------------------------------------------------------------------------
# rule18: 宏定义重复
# gcc5~gcc9 无法检查
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4005)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4005)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=macro-redefined)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=macro-redefined)
endif()
# rule19: pragma init_seg 指定了非法(不能识别的)section名字
# VC++ 特有。Linux 下的 gcc/clang 没有
if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4075)
endif()
# rule25: #undef 没有跟一个标识符
# Linux GCC/Clang 直接报错
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4006)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4006)
endif()
#--------------------------------------------------------------------------------
# Unused stuffs related
#--------------------------------------------------------------------------------
# rule27: 没有使用到表达式结果（无用代码行，应删除）
# 感觉容易被误伤，可以考虑关掉
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4552 /we4555)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4552 /we4555)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=unused-value)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=unused-value)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=unused-value)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=unused-value)
endif()
# rule28: “==”: 未使用表达式结果；是否打算使用“=”?
# Linux GCC 没有对应的编译选项
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4553)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4553)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=unused-comparison)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=unused-comparison)
endif()
# 可能会导致下一行代码报错，而问题根源在包含继续符的这行注释
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4006)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4006)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=comment)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=comment)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=comment)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=comment)
endif()
#--------------------------------------------------------------------------------
# String/Char related
#--------------------------------------------------------------------------------
# rule22: 不可识别的字符转义序列
# GCC5.4 能显示 warning 但无别名，因而无法视为 error
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4129)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4129)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=unknown-escape-sequence)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=unknown-escape-sequence)
endif()
# rule29: C++中，禁止把字符串常量赋值给 char* 变量
# VS2019 开启 /Wall 后也查不到
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=write-strings)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# Linux Clang 和 AppleClang 不太一样
if(CMAKE_SYSTEM_NAME MATCHES "Linux")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=writable-strings)
elseif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=c++11-compat-deprecated-writable-strings)
endif()
endif()
# rule31: multi-char constant
# MSVC 没有对应的选项
if(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=multichar)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=multichar)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=multichar)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=multichar)
endif()
#--------------------------------------------------------------------------------
# Type safe related
#--------------------------------------------------------------------------------
# rule9: 避免把 unsigned int 和 int 直接比较
# 通常会误伤，例如 for 循环中。可以考虑关掉
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4018)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4018)
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=sign-compare)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=sign-compare)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=sign-compare)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=sign-compare)
endif()
# rule20: size_t 类型被转为更窄类型
# VC/VC++ 特有。 Linux 下的 gcc/clang 没有
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4267)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4267)
endif()
## rule34: double 型转 float 型，可能有精度丢失（尤其在 float 较大时）
# MSVC 默认是放在 /W3
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we4244)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we4244)
endif()
## rule37: float 转换隐式转换为 int，可能改变变量的值
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=float-conversion)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=float-conversion)
endif()
#--------------------------------------------------------------------------------
# Misc
#--------------------------------------------------------------------------------
## rule33: 括号里面是单个等号而不是双等号
# Linux Clang14 可以发现问题，但 GCC9.3 无法发现; android clang 可以发现
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=parentheses)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=parentheses)
endif()
## rule35: 父类有 virtual 的成员函数，但析构函数是 public 并且不是 virtual, 会导致 UB
# https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c35-a-base-class-destructor-should-be-either-public-and-virtual-or-protected-and-non-virtual
# -Wnon-virtual-dtor (C++ and Objective-C++ only)
# Warn when a class has virtual functions and an accessible non-virtual destructor itself or in an accessible polymorphic base
# class, in which case it is possible but unsafe to delete an instance of a derived class through a pointer to the class
# itself or base class. This warning is automatically enabled if -Weffc++ is specified.
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=non-virtual-dtor)
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=non-virtual-dtor)
endif()
## rule36: switch case 忘记写 break, 会 fallthrough 执行， 可能导致数组越界(具体取决于你的代码). 不写break我们视为错误。
if((CMAKE_C_COMPILER_ID MATCHES "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "GNU"))
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-fallthrough)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-fallthrough)
elseif((CMAKE_C_COMPILER_ID MATCHES "Clang") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=implicit-fallthrough)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=implicit-fallthrough)
endif()
# rule5: 避免使用影子(shadow)变量
# 有时候会误伤, 例如eigen等开源项目, 可以手动关掉
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND OVERLOOK_C_COMPILE_OPTIONS /we6244 /we6246 /we4457 /we4456)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS /we6244 /we6246 /we4457 /we4456)
else()
list(APPEND OVERLOOK_C_COMPILE_OPTIONS -Werror=shadow)
list(APPEND OVERLOOK_CXX_COMPILE_OPTIONS -Werror=shadow)
endif()
# 将上述定制的 FLAGS 追加到 CMAKE 默认的编译选项中
# 为什么是添加而不是直接设定呢？因为 xxx-toolchain.cmake 中可能会设置一些默认值 (如 Android NDK), 需要避免这些默认值被覆盖
string(REPLACE ";" " " OVERLOOK_C_FLAGS "${OVERLOOK_C_COMPILE_OPTIONS}")
string(REPLACE ";" " " OVERLOOK_CXX_FLAGS "${OVERLOOK_CXX_COMPILE_OPTIONS}")
if(OVERLOOK_GLOBAL)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OVERLOOK_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OVERLOOK_CXX_FLAGS}")
else()
add_library(overlook INTERFACE)
target_compile_options(overlook INTERFACE $<$<COMPILE_LANGUAGE:C>:${OVERLOOK_C_COMPILE_OPTIONS}>)
target_compile_options(overlook INTERFACE $<$<COMPILE_LANGUAGE:CXX>:${OVERLOOK_CXX_COMPILE_OPTIONS}>)
endif()
unset(OVERLOOK_C_COMPILE_OPTIONS)
unset(OVERLOOK_CXX_COMPILE_OPTIONS)
##################################################################################
# Add whole archive when build static library
# Usage:
# overlook_add_whole_archive_flag(<lib> <output_var>)
# Example:
# add_library(foo foo.hpp foo.cpp)
# add_executable(bar bar.cpp)
# overlook_add_whole_archive_flag(foo safe_foo)
# target_link_libraries(bar ${safe_foo})
##################################################################################
function(overlook_add_whole_archive_flag lib output_var)
if("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
if(MSVC_VERSION GREATER 1900)
set(${output_var} -WHOLEARCHIVE:$<TARGET_FILE:${lib}> PARENT_SCOPE)
else()
overlook_warn("MSVC version is ${MSVC_VERSION}, /WHOLEARCHIVE flag cannot be set")
set(${output_var} ${lib} PARENT_SCOPE)
endif()
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
set(${output_var} -Wl,--whole-archive ${lib} -Wl,--no-whole-archive PARENT_SCOPE)
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
# set(${output_var} -Wl,--whole-archive ${lib} -Wl,--no-whole-archive PARENT_SCOPE)
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND NOT ANDROID)
set(${output_var} -Wl,-force_load ${lib} PARENT_SCOPE)
elseif(ANDROID)
# 即使是 NDK21 并且手动传入 ANDROID_LD=lld, 依然要用ld的查重复符号的链接选项
set(${output_var} -Wl,--whole-archive ${lib} -Wl,--no-whole-archive PARENT_SCOPE)
else()
overlook_error("add_whole_archive_flag not supported yet for current compiler: ${CMAKE_CXX_COMPILER_ID}")
endif()
endfunction()