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cmake_minimum_required(VERSION 3.18)
project(PchReuseFromObjLib)
set(CMAKE_PCH_WARN_INVALID OFF)
if(CMAKE_CXX_COMPILE_OPTIONS_USE_PCH)
add_definitions(-DHAVE_PCH_SUPPORT)
endif()
######################################################################
file(WRITE ${CMAKE_BINARY_DIR}/CONFIG/config.hxx "/*empty*/\n")
file(WRITE ${CMAKE_BINARY_DIR}/pch.cxx [=[
void nothing()
{
}
]=])
file(WRITE ${CMAKE_BINARY_DIR}/string.hxx [=[
#include <string.h>
namespace std {
struct string
{
char storage[20];
string(const char* s) {
strcpy(storage, s);
}
const char* c_str() const {
return storage;
}
};
}
]=])
add_library(pch-generator OBJECT ${CMAKE_BINARY_DIR}/pch.cxx)
set_property(TARGET pch-generator PROPERTY POSITION_INDEPENDENT_CODE ON)
target_precompile_headers(pch-generator PRIVATE ${CMAKE_BINARY_DIR}/string.hxx)
target_include_directories(pch-generator PRIVATE ${CMAKE_BINARY_DIR}/CONFIG)
######################################################################
file(WRITE ${CMAKE_BINARY_DIR}/message.cxx [=[
#include "message.hxx"
#ifndef HAVE_PCH_SUPPORT
#include "string.hxx"
#endif
const char* message()
{
static std::string greeting("hi there");
return greeting.c_str();
}
]=])
file(WRITE ${CMAKE_BINARY_DIR}/message.hxx [=[
#include "config.hxx"
#ifdef WIN32_BUILD_SHARED
#ifdef BUILD_LIBRARY
#define MESSAGE_EXPORT __declspec(dllexport)
#else
#define MESSAGE_EXPORT __declspec(dllimport)
#endif
#else
#define MESSAGE_EXPORT
#endif
MESSAGE_EXPORT const char* message();
]=])
######################################################################
file(WRITE ${CMAKE_BINARY_DIR}/main.cxx [=[
#include "message.hxx"
#include <string.h>
int main()
{
return strcmp(message(), "hi there");
}
]=])
######################################################################
enable_testing()
function(add_library_and_executable type)
add_library(message_${type} ${type} ${CMAKE_BINARY_DIR}/message.cxx)
target_precompile_headers(message_${type} REUSE_FROM pch-generator)
set_property(TARGET message_${type} PROPERTY POSITION_INDEPENDENT_CODE ON)
set_property(TARGET message_${type} PROPERTY DEFINE_SYMBOL "")
if (WIN32 AND type STREQUAL "SHARED")
file(WRITE ${CMAKE_BINARY_DIR}/SHARED/config.hxx [=[
#define BUILD_LIBRARY
#define WIN32_BUILD_SHARED
]=])
target_include_directories(message_${type} PRIVATE ${CMAKE_BINARY_DIR}/SHARED)
# Workaround for VS2008, the compiler fails with
# c1xx : fatal error C1083: Cannot open source file: '_WINDLL': No such file or directory
file(WRITE ${CMAKE_BINARY_DIR}/_WINDLL "/*empty*/\n")
else()
target_include_directories(message_${type} PRIVATE ${CMAKE_BINARY_DIR}/CONFIG)
endif()
add_executable(main_${type} ${CMAKE_BINARY_DIR}/main.cxx)
target_include_directories(main_${type} PRIVATE ${CMAKE_BINARY_DIR})
if (WIN32 AND type STREQUAL "SHARED")
file(WRITE ${CMAKE_BINARY_DIR}/main_SHARED/config.hxx "#define WIN32_BUILD_SHARED\n")
target_include_directories(main_${type} PRIVATE ${CMAKE_BINARY_DIR}/main_SHARED)
else()
target_include_directories(main_${type} PRIVATE ${CMAKE_BINARY_DIR}/CONFIG)
endif()
target_link_libraries(main_${type} PRIVATE message_${type})
add_test(NAME main_${type} COMMAND main_${type})
endfunction()
foreach(type OBJECT STATIC SHARED)
add_library_and_executable(${type})
endforeach()
|
