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.
-Chris
