On Tue, Sep 3, 2013 at 2:33 PM, Matthew Woehlke <matthew.woeh...@kitware.com > wrote:
> On 2013-09-03 13:21, Felipe Menezes Machado wrote: > >> I'm having trouble understanding this behavior: what happens if the >> directory of the executable doesn't exist? >> >> I created a minimum example CMakeLists.txt (where foo.cpp is just a hello >> world): >> >> add_executable(test/test.bin foo.cpp) >> >> If the "test" directory doesn't exist, should the build system create it? >> > > Well, ninja seems to think so :-). > > > Does that depend on the build system? >> > > Yes; ninja has a feature where it creates any non-existing directories > that are used by any outputs. At least make does not have a similar > feature. I don't know about other generators (e.g. xcode, msvc). > > > I tested with make, it gives an error when executing "ld": >> >> /usr/bin/ld: cannot open output file test/test.bin: No such file or >> directory >> >> The command that generates the executable and gives the error is (from >> "make VERBOSE=1"): >> >> /usr/bin/c++ CMakeFiles/test/test.bin.dir/**foo.cpp.o -o >> test/test.bin >> -rdynamic >> >> On the other hand, when I tested it with Ninja, it created the directory >> and finished without errors. >> > > Interesting question. I suppose CMake could be taught to generate make > rules to emulate ninja's behavior. > > Whether or not such a thing should be done is an interesting question. > (Especially as it probably should be done for all generators, it at all.) > > It would at least be a very interesting optional feature. Like something you specify in your CMakeLists.txt file, that every output directory should be created. -- []s Relax, it's only ONES and ZEROS!!!! Felipe Menezes Machado Mestre em Ciência da Computação - DCC - UFMG
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