On Wed, 3 Aug 2005, Linus Torvalds wrote:
>
> Actually, having thought about this some more, I think I'll just parse the
> initial preprocessing tokens into global scope. That way I can do it just
> once at the top, and every file will automatically see it.
Ok, done and checked in. As mentioned, it has somewhat "interesting"
behaviour wrt predefines:
[EMAIL PROTECTED] sparse]$ cat -n t.c
1 DEBUG
2 #undef DEBUG
[EMAIL PROTECTED] sparse]$ sparse -E t.c t.c
DEBUG
DEBUG
[EMAIL PROTECTED] sparse]$ sparse -DDEBUG=1 -E t.c t.c
1
DEBUG
ie notice in the second case how the "#undef DEBUG" will mean that the
second time through t.c, DEBUG won't be defined any more (and will thus
obviously preprocess to itself).
This is true only of the _predefined_ defines - a file that does a
"#include" will obviously have that #include done within the scope of that
file, and it will be re-done every time the file is accessed.
I may go back to the old setup if this turns out inconvenient, or I might
make "#undef" only hide the symbol for that particular scope (so when we
start a new scope, we'll automatically see the global #define again).
#undef really screws up my otherwise beautiful scoping code. It's a nasty
special case.
Linus
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