Consider the following source tree:
foo/narf.cpp
bar/narf.c
bar/gnampf.cpp
The .pro file has
SOURCES += foo/narf.cpp bar/gnampf.cpp
The file bar/narf.c is not supposed to be built for whatever reason.
QMake's nmake Makefile generator generates inference rules of the form
{.\foo}.cpp{debug\}.obj::
...
for every source subdirectory and every source file extension.
Thus, we have
{.\foo}.cpp{debug\}.obj::
{.\bar}.cpp{debug\}.obj::
{.\bar}.c{debug\}.obj::
Depending on the exact execution order of the inference rules (which
depends on the names of the files) the latter rule might get picked,
and we're erronously compiling bar/narf.c even though it's not
referenced in the .pro file.
Conclusion: QMake's detection of conflicting source files must
consider the base names of source files, and not the exact file names.
Fixes: QTBUG-72059
Change-Id: I50c2725ae2a7421053369a10680230f571af00ea
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
6a221f3d05