Just finished figuring out why CMake was behaving strangely for me:
Originally I built out of tree:
mkdir build
cd build
cmake ../src
However at some point it appears I screwed up and typed 'cmake' in /src
Thereafter cmake was ignoring the build path and writing all Makefiles
in /src; I would try to change something using cmake ../src
-DMYVAR=MYVALUE, but the change would be mysteriously ignored... because
it was ignoring the cwd /build and updating /src/Makefile, whilst I was
using /build/Makefile.
Is it ever valid to build in-tree and also build out-of-tree from the
same source tree? If so then it probably shouldn't ignore the (cwd)
build path like that. If not then it should be a fatal error or at least
a warning that your out of tree build is not actually being updated. In
other words, it is a tricky trap that "cmake ../src" /might/ mean
"update the Makefiles in ../src" or /might/ mean "update the Makefiles
in the current directory using the CMakeLists.txt in ../src"
At the moment you get:
Build files have been written to: /src
Which does indicate the problem, but because the message is routine and
so I ignore it every day, I didn't notice it for quite some time.
Chris
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