The default generator and all other associated information ( '-D' ) is kept in the CMakeCache.txt file in the root of the build directory. The execution of `cmake -S <source_dir> -B <binary_dir>` will reload this cache before doing anything else. Have you verified that your build directory hasn't deleted this file?
On Tue, Oct 8, 2019 at 8:31 PM Nagurne, James via CMake <cmake@cmake.org> wrote: > > Hi all, > > > > My question comes from a Ninja generator build system, and is specifically > about an internal rule generated by cmake. > > What is the purpose of the RERUN_CMAKE rule generated by CMake with a Ninja > generator? > > > > In the current repo, the only reference to this rule is in > WriteTargetRebuildManifest here > > At line 1285, the rule is written out, seemingly as-is. > > > > According to lines 1274 to 1284, the only actual behavior of this command, > which is executed whenever the source CMakeLists.txt file, files included > from the CMakeLists, and some other CMake installation files change, is: > > cmake -S <source_dir> -B <binary_dir> > > > > This seems completely insufficient for “re-running” cmake. The most obvious > flaw is the absence of the generator. When I’ve seen this rule fire, my Ninja > build system adds a useless Makefile to the build system, and then > (hopefully) continues building as if nothing had been done at all, without so > much as inspecting that Makefile. > > > > What about command-line arguments like -D? > > > > Am I missing the purpose of this rule or potentially doing something > non-standard? The reason I send an email is because this behavior is sending > my project into a cmake loop where it detects build.ninja is out of date, > re-runs cmake to generate a Makefile instead of a ninja build system, and > then infinitely repeats because it never actually re-ran anything. > > > > Thanks, > > JB > > Code Generation > > Texas Instruments > > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > https://cmake.org/mailman/listinfo/cmake -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: https://cmake.org/mailman/listinfo/cmake
