http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47047
Summary: Support for path translation in __FILE__
Product: gcc
Version: 4.1.3
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: preprocessor
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: jo...@netbsd.org
Created attachment 22841
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22841
Implement cpp -iremap
__FILE__ expands to full path names in some situation, e.g. if it is used in a
header found via -I/some/where. The resulting leak of the header location into
the file binary is undesirable in certain situations.
For NetBSD, two relevant cases are the visiblity protection in pkgsrc, which
effectively turns /usr/pkg/include/foo into /.../work/.buildlink/include/foo
and cross-compiling the system, which would leak /.../usr/include/foo instead
of /usr/include/foo or the location of the source tree.
The attached patch implements a CPP option to match the file path against a
list of prefixes and substitute the prefix on match. With this patch, most
references to the src and obj locations in NetBSD can be translated into the
canonical positions.
The patch is the version included in NetBSD against the system gcc, it can be
updated if necessary.
