Gcc header file location

How does gcc find the following header file? Ask Question. Asked 6 years, 3 months ago. Active 6 years, 3 months ago. Viewed 13k times. Improve this question. What problem are you trying to solve? It doesn't look like it recursively looks through. Including just ptrace. This is almost certainly a bug in the "multiarch" patches to GCC.

I am not sure how someone managed to achieve that bug; if I remember correctly, the most obvious way to add system include directories does add them to what is printed by -v. That would break just about every C library in the world. Show 1 more comment. Active Oldest Votes. Command Line Fanatic A blog about technology, protocols, security, details and fanaticism. However, if I change the include to use single quotes: include "stdio.

Other than -nostdinc , GCC does not give you a way to remove a directory from the search path once it's been added. Add a comment: Completely off-topic or spam comments will be removed at the discretion of the moderator.

Name: Name is required Email will not be displayed publicly :. I have to tell you that it's hard to find this page in google, i found it on 16 spot, i know how to help your site to rank, increase traffic and sales, just search in google for - Arshumaker SEO tips. Thanks a lot! The only clear explanation I found on this matter. I'll come back surely! When using the double quote method for including a file, relative paths are evaluated against the location of the file containing the include statement.

In your example, they happen to be the same location, but this often isn't the case for instance, a header file including another header file.

Is such code considered portable? Is this behavior consistent across different compilers' preprocessors? I've wanted a straight answer to this question for about 20 years, but never got around to tracking it down until now.

This is an awesome post! That's very useful to have for a program as old and as heavily-used as "cpp" gcc is. Thank you! The -D option is one way to define a macro before a precompiled header is included; using a define can also do it. There are also some options that define macros implicitly, like -O and -Wdeprecated ; the same rule applies to macros defined this way.

If you do use differing options when generating and using the precompiled header, the actual behavior is a mixture of the behavior for the options. For instance, if you use -g to generate the precompiled header but not when using it, you may or may not get debugging information for routines in the precompiled header. Asked 13 years, 1 month ago. Active 2 years, 2 months ago. Viewed k times.

On a Unix system, where does gcc look for header files? MD XF 7, 7 7 gold badges 37 37 silver badges 65 65 bronze badges. Bill the Lizard Bill the Lizard k gold badges silver badges bronze badges.

By the way, if you want to know where the. Add a comment. Active Oldest Votes. You will get a reliable answer for your specific setup. Drew Dormann Drew Dormann I'm finding it difficult to search for this.

I guess the C preprocessor is cpp instead of cc1? SteveJorgensen yep! Show 3 more comments. Kalin 1, 1 1 gold badge 15 15 silver badges 20 20 bronze badges.