Sometimes it is needed to understand compilation platform during compile or acting and designing UI elements in accordance with the platform. In this post we would like to give some examples to check some options in application codes. The C++ compiler predefines certain global identifiers, known as manifest constants. Most global identifiers begin and end with __ (two underscores) in C++.
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To understand compile platform you can use Predefined Macros to check platform operating system. All these macros are listed here. There are CLANG Predefined Macros listed by LLVM.org here . Here below we listed some #if / #endif examples. Note that #definitions are cared in completion, so if something is not related with under this #if clauses it is not compiled. For example if you check your application is for Windows or not, your Windows specific codes are only compiled if it is compiled for windows. So by using these kind of Predefined Macros, all codes will not be include in compilation that will let your compiled file size as much as small with predefinitions.
Checking OS Platform
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#if _WIN32 || _WIN64 // do Windows based specific things #elseif __ANDROID__ // do Android OS specific things #elseif __APPLE__ // do iOS specific things #elseif __MACH__ // do Mac-OS specific things #else // do for other OSes if none of above #endif |
Checking Compilation if it is compiled with BCC or CLANG Compiler
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#if __BORLANDC__ // do things for BCC compiler #elseif __clang__ // do things for CLANG compiler #endif |
Checking Compilation if it is C only or C++
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if __cplusplus // do c++ things #else // do c things #endif |
Checking Compilation if it is for 32bit or 64bit Windows ( Inline usage)
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#if _WIN32 || _WIN64 #if _WIN64 std::cout << "Windows 64bits"; #else std::cout << "Windows 32bits"; #endif #endif |
Checking ARM Platform if it is 32bit or 64bit
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#if __arm__ || __arm64__ // do ARM based specific things #if __arm__ // do things for ARM 32bits #elseif __arm64__ // do things for ARM 64bits #endif #endif |
Please see full list of Predefined Macros to examine more options about OS & Compiler based options.
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