WinLibs could be just what you are looking in these case: In the future WinLibs plans to also release binary packages of many open source libraries and applications built with this compiler.Ĭlick here to see the philosophy and design decisions behind. This is a standalone build, which means this download offers a complete compiler environment for Windows. LLVM/Clang/LLD/LLDB - The LLVM Compiler Infrastructure.JWasm - A free MASM-compatible assembler.Yasm - The Yasm Modular Assembler Project.GNU Make - a tool which controls the generation of executables and other non-source files.GNU Binutils - a collection of binary tools.Linux) to generate Windows executables, the WinLibs project only focusses on building versions that run natively on Windows.Īlso some additional tools are added, including: The combination of these results in a free C/C++ compiler for Windows.Įven though GCC and MinGW-w64 can be used on other platforms (e.g. MinGW-w64 is a free and open source C library for targetting Windows 32-bit and 64-bit platforms. GCC (GNU Compiler Collection) is a free and open source compiler for C and C++ (and other languages like Objective-C, Fortran, D). In short: it's a free C and C++ compiler for Microsoft Windows. The interface issue is orthogonal to the function vs subroutine issue.WinLibs - GCC+MinGW-w64 compiler for Windows WinLibs standalone build of GCC and MinGW-w64 for Windowsĭownload | How to use from Windows Command Prompt | How to use from Code::Blocks | Philosophy What is it? Work fine without any interface block or declaration. It is mostly useful if you need to call C or FORTRAN 77 code from someone else, for which you couldn't use modules.Īnd change the line y = func(x) to call func(x,y) then the code will But it will not prevent linking to wrong functions at link time: there is no guarantee that the interface is right. This would force you to follow that declaration in the program. In your case, you could add one in the program file. The interface block is a kind of "in between". When you compile as a "simple" object file, the compiler will simply call whatever function is named func without verification, as long as such a function is given in an object file. You also do not need to declare real :: func as the declarations are taken from the module. When you use modules, the compiler will check the type of the arguments of the functions. Then write use func_m in the main program, before implicit none: gfortran -c func_m.f90, gfortran -c test.f90 and gfortran -o test test.o func_m.o. Since Fortran 90, the recommended way to define reusable functions and subroutines is to use modules. Why do I not need to include an interface block in my program file? As you can see in other questions and answers, there are usually better ways to provide an explicit interface than using an interface block. There are times when an explicit interface is required and in most (nearly all) cases an explicit interface is better. Loosely, then, you don't need an interface block in these cases because the implicit interfaces are good enough. Those three things again match the subroutine's definition, so things are fine. Further, how you reference the function matches precisely the properties of the function itself.Įqually, in the case of the subroutine, a call func(x,y) tells the main program exactly three things, again with the implicit interface: The reference to the function is compatible with that knowledge. In this way, the main program knows exactly three things about func: This function has an interface in the main program as a result, so it is legitimate to reference that function with y = func(x). The declaration real :: func in the main program here declares func to be a function with (default) real result. My question is, why do I not need to include an interface block in my program file? Is it simply a matter of good practice, or does defining func as a real variable serve as shorthand? I am on Windows, having installed gfortran through minGW.Īs an aside/related question, if I instead use a subroutine: subroutine func(x,y)Īnd change the line y = func(x) to call func(x,y) then the code will work fine without any interface block or declaration. I then compile it using gfortran -o test test.f90 func.f90 and the code works as expected. I was testing how much information was needed in the interface block and realised that I can remove it entirely. Following examples, I have been writing programs in one file, functions in another, and using interface blocks in my main program to refer to the external function. I'm trying to teach myself Fortran, and have been messing around with linking multiple files together.
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