Hello,
I have a project where circular dependencies are generated when I use
the Ninja generator, but not the default Unix Makefiles. I could create
a minimal test like this:
$ cat CMakeLists.txt
add_subdirectory (ext ${PROJECT_BINARY_DIR}/ext)
$ cat ext/CMakeLists.txt
set (OUT ${CMAKE_CURRENT_LIST_DIR})
add_custom_command (OUTPUT ${OUT}/foo
COMMAND touch ${OUT}/foo
)
add_custom_target (foo ALL
DEPENDS ${OUT}/foo
)
add_custom_command (TARGET foo
POST_BUILD
COMMAND cp ${OUT}/foo ${CMAKE_BINARY_DIR}/foo
)
$ touch ext/bar
$ cmake -G Ninja .
[...]
$ ninja
ninja: warning: multiple rules generate ext/foo. builds involving this
target will not be correct; continuing anyway [-w dupbuild=warn]
ninja: error: dependency cycle: ext/foo -> ext/CMakeFiles/foo.util ->
ext/CMakeFiles/foo -> ext/foo
I used a freshly compiled CMake 3.8 and the latest binary ninja from
https://github.com/Kitware/ninja/releases.
Ignacio
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