C Conditional Compile For Dev Vs Production
I would like to write a cross-platform function in C that contains system calls. What conditional compilation flags can I check to determine which operating system the code is being compiled for? I'm interested mostly in Windows and Linux, using Visual Studio and GCC. I think it should look something like this. How to: Compile Conditionally with Trace and Debug.; 3 minutes to read +5; In this article. While you are debugging an application during development, both your tracing and debugging output go to the Output window in Visual Studio. Production Deployment. Most of the tips below are enabled by default if you are using Vue CLI. This section is only relevant if you are using a custom build setup. Turn on Production Mode. During development, Vue provides a lot of warnings to help you with common errors and pitfalls.
- C Conditional Compile For Dev Vs Production System
- C Conditional Compile For Dev Vs Production Key
- C Conditional Compile For Dev Vs Production Software
When the C# compiler encounters an #if directive, followed eventually by an #endif directive, it compiles the code between the directives only if the specified symbol is defined. Unlike C and C++, you cannot assign a numeric value to a symbol. The #if statement in C# is Boolean and only tests whether the symbol has been defined or not. For example:
You can use the operators (equality) and != (inequality) only to test for the bool values true or false. true means the symbol is defined. The statement #if DEBUG has the same meaning as #if (DEBUG true). You can use the && (and), (or), and ! (not) operators to evaluate whether multiple symbols have been defined. You can also group symbols and operators with parentheses.
C Conditional Compile For Dev Vs Production System
Remarks
#if, along with the #else, #elif, #endif, #define, and #undef directives, lets you include or exclude code based on the existence of one or more symbols. This can be useful when compiling code for a debug build or when compiling for a specific configuration.
A conditional directive beginning with a #if directive must explicitly be terminated with a #endif directive.
#define lets you define a symbol. By then using the symbol as the expression passed to the #if directive, the expression evaluates to true.
You can also define a symbol with the -define compiler option. You can undefine a symbol with #undef.
C Conditional Compile For Dev Vs Production Key
A symbol that you define with -define or with #define doesn't conflict with a variable of the same name. That is, a variable name should not be passed to a preprocessor directive, and a symbol can only be evaluated by a preprocessor directive.
The scope of a symbol created with #define is the file in which it was defined.
The build system is also aware of predefined preprocessor symbols representing different target frameworks in SDK-style projects. They're useful when creating applications that can target more than one .NET implementation or version.
| Target Frameworks | Symbols |
|---|---|
| .NET Framework | NETFRAMEWORK, NET20, NET35, NET40, NET45, NET451, NET452, NET46, NET461, NET462, NET47, NET471, NET472, NET48 |
| .NET Standard | NETSTANDARD, NETSTANDARD1_0, NETSTANDARD1_1, NETSTANDARD1_2, NETSTANDARD1_3, NETSTANDARD1_4, NETSTANDARD1_5, NETSTANDARD1_6, NETSTANDARD2_0, NETSTANDARD2_1 |
| .NET Core | NETCOREAPP, NETCOREAPP1_0, NETCOREAPP1_1, NETCOREAPP2_0, NETCOREAPP2_1, NETCOREAPP2_2, NETCOREAPP3_0, NETCOREAPP3_1 |
Note
For traditional .NET Framework projects, you have to manually configure the conditional compilation symbols for the different target frameworks in Visual Studio via the project's properties pages.
Other predefined symbols include the DEBUG and TRACE constants. You can override the values set for the project using #define. The DEBUG symbol, for example, is automatically set depending on your build configuration properties ('Debug' or 'Release' mode).
Examples
The following example shows you how to define a MYTEST symbol on a file and then test the values of the MYTEST and DEBUG symbols. The output of this example depends on whether you built the project on Debug or Release configuration mode.
The following example shows you how to test for different target frameworks so you can use newer APIs when possible: