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    Normally, all definitions that are passed to the compiler are controlled by CMake That is, you create a CMake variable with
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    @JimBalter "you're more likely to catch bugs" Quite a late reply, but this is not always true in general C, as well as backward-compatible C++, heavily rely on the preprocessor working the way it does
  • Check if a variable is undefined in PHP - Stack Overflow
    To check if a variable is undefined you will have to check if the variable is in the list of defined variables, using get_defined_vars() There is no equivalent to JavaScript's undefined (which is what was shown in the question, no jQuery being used there) In the following example it will work the same way as JavaScript's undefined check
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    #ifdef USE_CONST #define MYCONST const #else #define MYCONST #endif Then you can write code like this: MYCONST int x = 1; MYCONST char* foo = "bar"; and if you compile with USE_CONST defined (e g , typically something -DUSE_CONST in the makefile or compiler options) then it will use the consts; otherwise it won't
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    #define STR(x) #x char *s1 = "abc"; char *s2 = STR(abc); will assign identical values to s1 and s2 If you
  • Detect Windows or Linux in C, C++ - Stack Overflow
    I am writing a cross platform program I want this one program to run under both Windows and Linux, so I have two different code segments for the two platforms If the OS is Windows, I want the first
  • Setting JAVA_HOME - Stack Overflow
    Set the JAVA_HOME Variable Windows 7 – Right click My Computer and select Properties > Advanced Windows 8 – Go to Control Panel > System > Advanced System Settings
  • How to test if preprocessor symbol is #defined but has no value?
    I want to make sure that the project fails to compile if user forgot to define this string While i'd check this in a previous build-step, you can do this at compile-time Using Boost for brevity: #define A "a" #define B BOOST_STATIC_ASSERT(sizeof(BOOST_STRINGIZE(A)) > 1); succeeds BOOST_STATIC_ASSERT(sizeof(BOOST_STRINGIZE(B)) > 1); fails





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