https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114049
--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> --- The manual currently says: -I dir -iquote dir -isystem dir -idirafter dir Add the directory dir to the list of directories to be searched for header files dur- ing preprocessing. If dir begins with ‘=’ or $SYSROOT, then the ‘=’ or $SYSROOT is replaced by the sysroot prefix; see --sysroot and -isysroot. Directories specified with -iquote apply only to the quote form of the directive, #include "file". >>> Directories specified with -I, -isystem, or -idirafter apply to lookup for >>> both the #include "file" and #include <file> directives. <<< You can specify any number or combination of these options on the command line to search for header files in several directories. The lookup order is as follows: 1. Forthequoteformoftheincludedirective,thedirectoryofthecurrentfile is searched first. 2. For the quote form of the include directive, the directories specified by -iquote options are searched in left-to-right order, as they appear on the command line. 3. Directories specified with -I options are scanned in left-to-right order. 4. Directories specified with -isystem options are scanned in left-to-right order. 5. Standard system directories are scanned. 6. Directories specified with -idirafter options are scanned in left-to-right The highlighted bit seems to say we should be searching for either "" or <> .. I wonder if something is being confused by the user framework path (-F .)
