On Wed, Jan 28, 2009 at 12:21 PM, Chris Lattner <clatt...@apple.com> wrote: > > On Jan 28, 2009, at 11:51 AM, H.J. Lu wrote: > >> Hi, >> >> I got a request to try "FOO.H" if foo.h doesn't exist when dealing >> with >> >> #include "foo.h" >> >> Any comments? > > I strongly recommend against this, unless this is only a "last chance" fall > back. > > From a performance standpoint, if you have -Idir1 -Idir2 -Idir3, you don't > want to stat all variants of "foo.h" in dir1 before moving on to dir2. If > you do a full search for foo.h in all appropriate search paths, and then > redo it only on failure, then the performance issue goes away. However, in > that case you get very difficult to explain behavior if you have multiple > files with spelling variants of foo.h in different search paths. >
I won't stat all variants of "foo.h". I think scandir will work here and this feature will be supported only if scandir is available. -- H.J.
