Adding system header search path to Xcode

Question

Posting this question for reference purpose  I ll answer immediately   How to add header search paths to Xcode  Especially when including with this syntax   include  lt myheader h gt     Adding path globally to all projects like system headers  Adding path to only to a specific project

User · Answer

Though this question has an answer  I resolved it differently when I had the same issue  I had this issue when I copied folders with the option Create Folder references  then the above solution of adding the folder to the build path worked  But when the folder was added using the Create groups for any added folder option  the headers were picked up automatically

User · Answer

We have two options   Look at Preferences- gt Locations- gt  quot Custom Paths quot  in Xcode s preference  A path added here will be a variable which you can add to  quot Header Search Paths quot  in project build settings as  quot  cppheaders quot   if you saved the custom path with that name   https   help apple com xcode mac 11 4   deva52afe8a4   Set HEADER SEARCH PATHS parameter in build settings on project info  I added  quot   SRCROOT  quot  here without recursion  This setting works well for most projects    About 2nd option  Xcode uses Clang which has GCC compatible command set  GCC has an option -Idir which adds system header searching paths  And this option is accessible via HEADER SEARCH PATHS in Xcode project build setting  However  path string added to this setting should not contain any whitespace characters because the option will be passed to shell command as is  But  some OS X users  like me  may put their projects on path including whitespace which should be escaped  You can escape it like  Users my work a  project  with  space if you input it manually  You also can escape them with quotes to use environment variable like  quot   SRCROOT  quot   Or just use   to indicate current directory  I saw this trick on Webkit s source code  but I am not sure that current directory will be set to project directory when building it  The   SRCROOT  is predefined value by Xcode  This means source directory  You can find more values in Reference document  PS  Actually you don t have to use braces     I get same result with  SRCROOT  If you know the difference  please let me know

User · Answer

Follow up to Eonil s answer related to project level settings   With the target selected and the Build Settings tab selected  there may be no listing under Search Paths for Header Search Paths   In this case  you can change to  All  from  Basic  in the search bar and Header Search Paths will show up in the Search Paths section

User · Answer

To use quotes just for completeness     Users my work a project with space      If not recursive  remove the

[xcode] Adding system header search path to Xcode

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