Collectively, these macros are known as predefined compiler macros, and are used in abseil. Predefined compiler macros wiki operatingsystems sourceforge. These macros are in addition to the ansi predefined macros. There are no such macros predefined by osx compilers, but they may be defined by specific project makefiles and platformdetector scripts like. Please note that not all compilers defines these macros, e. Using the k switch to make the default character unsigned causes this macro to.
The target platform api is machbased including nextstep and macos 10. When the ansi option, or any std option that requests strict conformance, is given to the compiler, all the systemspecific predefined macros outside the reserved namespace are suppressed. Generic macros, of which at least one is defined on a unix compliant platform. The substitution is performed in the preprocessing phase. Predefined compiler macros wiki compilers sourceforge.
You can force the objectivec compiler to be used for a. A prominent example is the lclwidgettype, which is defined by the package lcl and allows to choose the widget set carbon, gtk, qt, win32, wince. When compiling third party sources, it might be necessary to temporarily disable some warnings. Direct use of these platform macros is discouraged, as they dont always contribute to the futureproofing of your code. Unity s platform dependent compilation feature consists of some preprocessor directives that let you partition your scripts a piece of code that allows you to create your own components, trigger game events, modify component properties over time and respond to user input in any way you like. These macros are defined by all gnu compilers that use the c preprocessor. Gnu make prefers to call them variables, but most unix make utilities call them macros. Where the value field is empty, the symbol is only defined. Using predefined macros eliminates the need to edit makefiles when the underlying compilation environment changes. For example, if youre writing a shader that checks for d3d11, you may want to ensure that, in the future, the check is extended to include vulkan. The implementation also supports several more microsoftspecific preprocessor macros. Im trying to detect the compiler used to compile my source code.
The compiler supports the predefined macros listed in the table below. Predefined compiler macros browse files at joinlogin. When it runs the preprocessor, it does so with these macros predefined. The compiler predefines certain global identifiers, known as manifest constants. These pages lists various predefined compiler macros that can be used to identify standards, compilers, operating systems, hardware architectures, and even basic runtime libraries at compiletime. I can easily find predefined macros to check for msvc or gcc see for. Instead, unity defines several helper macros in hlslsupport. We are slowly phasing out all predefined macros which are outside the reserved namespace. This macro is defined when your code is being compiled by the objectivec compiler. Overview of predefined compiler macros for standards, compilers, operating systems, and hardware architectures.
It is a script that you execute as a shell script build phase within your xcode project and which takes care of generating automatically the property list files for your packaged applications, bundles, frameworks, plugins, etc. In this example, cxx and cxxflags are make variables. They are available with the same meanings regardless of the machine or operating system on which you are using gnu c or gnu fortran. Please send updatescorrections to predefcontribute. They are available with the same meanings regardless of the machine or operating system on which you are using gnu c. If you want to use the expmac option, you must also specify the source compiler option to generate a source listing. This option has no effect unless preprocessed output is generated.
The cx51 compiler provides the following predefined constants you may use in preprocessor directives and c code to create portable programs. The parallel macros, inside the reserved namespace, remain defined. Some macros are defined only for specific build environments or compiler options. Note the following information when using this option. If you specify the expmac option but omit the source option, the compiler issues a warning message, and does not produce a source listing.
Conditionals are rules allowing to set macros depending on the target platform andor other macros. Sep 11, 2007 plist compiler, a property list compiler for xcode plist compiler lets you build localized and nonlocalized plist files from plc and ploc source files. Macros also provide access to the cflags macro and other flags macros for supplying compiler options from the command line. Their values are the major version, minor version, and patch level of the compiler, as integer constants.
For visual studio compiler there no any possibility get predefined macros from command line. Defined only in compilers that support cross compiling with a target of mac osx. To generate a list of all predefined macros that the compiler knows about, this. The c166 compiler provides you with predefined constants to use in preprocessor directives and c code for more portable programs. You can use a number of predefined macros to detect apple systems and mac os x in particular. For example, if we want to use a generic or opaque pointer type, we use void pointers. Using predefined preprocessor symbols for intel mkl version. I was wondering if there were any predefined macros that indicated whether the chip is using an external crystal based on the configuration bit settings. Predefined macros are also used extensively within makes implicit rules. Dec 16, 2019 preprocessor symbols macros substitute values in a program before it is compiled. These macros provide information about toolchain version numbers and compiler options. Conceptual information and tips about porting unix and linux applications to os x. They act like predefined macros, but you cannot undefine them. I was hoping to do this at compile time to save some code space but i can do it at run time if need be.
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