You can verify this by actually "overriding" stdio. I also got a compiler warning about an incompatible implicit declaration of built-in function 'printf' — my new stdio. So, if a header file is not found in the current directory, where does it look? Surely there must be a way to get GCC to tell you exactly where it's going to end up looking for its header files? Well, although it's convenient to think of GCC as a single monolithic application that takes in source code files and spits out working programs, it's technically a collection of other programs which chain together to produce the final compiled object file.
The first of these is CPP , short for C Pre-Processor , whose job is to look for compiler directives like include and modify the source code as specified by them; in the case of include, by copying the contents of another file into the current one.
This behavior is important — notice the include-fixed directory in the search path? On my system, it includes two files: limits. There are a couple of ways you can manipulate this directory structure. The simplest is by providing the compiler flag -I. Thus, if you create a directory headers , copy the "overridden" stdio.
If you want to add multiple directories to the search path, you specify the -I directory multiples times. These new directories are added to the beginning of the search path, in the order that they're presented on the command line. In general, though, you should probably never use the CPATH environment variable, since you'll end up creating non-portable source code; specify a Makefile instead.
If you look at all of the CPP search directory examples here, you'll notice that they always start with: include " As we know from experimentation, however, this search does include the current directory; GCC actually does allow you to modify this search path as well, with the -iquote compiler flag.
Here's an edge case that bit me last week. That is, searching begins relative to the directory that contains the source that's currently being processed.
The values specified in the project properties for include directories are used instead. For more information about how to set the include directories in Visual Studio, see Include Directories and Additional Include Directories. The example adds the contents of the file named stdio.
The example adds the contents of the file that's specified by defs. The quotation marks mean that the preprocessor first searches the directory that contains the parent source file. Nesting of include files can continue up to 10 levels. When processing of the nested include is finished, the preprocessor continues to insert the enclosing parent include file into the original source file.
The commands. H , the preprocessor follows the path. For include files that are specified as include "path-spec" , directory search begins in the directory of the parent file and then proceeds through the directories of any grandparent files.
That is, the search begins relative to the directory that contains the source file that's being processed. Back on the air; I will try one thing at a time for a while.
Thanks again. Aussie Susan. If the only indication of an error is the red underline, then ignore it as this is a long standing problem the editor parser does not get things right.
The ONLY thing to go by for errors is what the compiler sees. Very importantly Logical folders have no meaning to the compiler, they are only in the IDE to help you organize things.
When the compiler runs it simply sees what is on the disk, so look at the Files window in the IDE and check if this view makes sense to the compiler. Chancing to "myfile. Guys, this gremlin is back again.
More or less. Last night, I loaded 3. Lo and behold, things behaved as they should. Just like it is supposed to. This AM--everything has gone to hell again.
Sometimes, the clean and build brings back the links, sometimes it doesn't. A related I think symptom: I have a lot of conditional compiles.
Right now, they are all grayed out, but if I edit the valid sections, the edits take and it apparently compiles correctly. I use a couple warning statements to demonstrate that it compiled as it was supposed to.
They show up. This is driving me nuts. Thanks for any suggestions. If I am doing something stupid, say so, just let me know what. As I said before, this is a long standing problem with the IDE. I agree that it can case problems with autocomplete but, as others have said, this is just "one of those things"; sometimes restarts will help but not always. Starting Member.
Deleting the cache directory might help. It did for me but only until I changed another line in one of the affected files. Switching back to v3. It's the IDE. The header files of the modules are in their own directories. In case you were using cmake-gui and visual studio on Windows to make opencv I had 3. This will generate all required files in a single folder, so you can easily connect header files:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Where are the opencv2 include files? Ask Question. Asked 9 years, 8 months ago.
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