https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65852
Bug ID: 65852
Summary: Incorrect escaping in depfiles
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: paul_robinson at playstation dot sony.com
When gcc creates a depfile, and a target or dependency has a space or # in it,
the filespec in the depfile is escaped with a backslash so GNU Make won't
interpret it as a delimiter or comment character.
GNU Make also expects backslashes to be escaped, which can lead to some
misinterpretation if a backslash in the original filename is immediately
followed by a space or # character.
gcc will take care to double the backslashes immediately preceding a space,
but does not do the same for #, which results in a bogus depfile.
$ cat tspace.c
#include "foo\ bar.h"
#include "bar\#foo.h"
int i;
$ ls
bar\#foo.h foo\ bar.h tspace.c
$ gcc -c -MMD tspace.c
$ cat tspace.d
tspace.o: tspace.c foo\\\ bar.h bar\\#foo.h
$ make -f tspace.d tspace.o
make: *** No rule to make target `bar\', needed by `tspace.o'. Stop.
$
