There are several files in Linux whose names only differ by capitalization.
This has caused us some support issues due to third party filesystems/revision
control systems, which overwrite the wrong file, causing non-obvious
compilation errors. I recently added a more obvious compile time failure to
some of these files to reduce the number of support calls we get on the
subject. I thought I'd bring it up in case someone thinks it might be a good
idea to move this to the mainstream kernel. The code is:
/* if your compiler generates an error here, it is likely due to a
filename-capitalization error, caused by a case-insensitive filesystem or
revision control system */
#define __CHECK_FILENAME(filename) \
static int __checkfname __attribute__((unused)) =
(1/((__builtin_strcmp((__FILE__ + __builtin_strlen(__FILE__) -
__builtin_strlen(filename)), filename))?0:1))
__CHECK_FILENAME("xt_dscp.c");
(This would appear at the bottom of xt_DSCP.c, xt_dscp.c, etc. in global
scope). While not overly pretty, it does point out what the actual error
is, and doesn't have any side-effects. If there's interest, let me know and
I can try to push it upstream.
John
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