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README.cmake.md

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Using cmake to build libdap4

how to build outside the source tree

Make a build directory (or build/libdap4 if libdap4 is a git submodule). Then, in that directory, run cmake with the source directory as a command line argument.

For the submodule case, from inside the repo's top-level, where libdap is in a directory named 'external':

mkdir build/libdap4
cmake ../../external/libdap4

For the 'normal' case, where 'build' is made inside the libdap4 top-level source directory:

mkdir build/
cd build
cmake ../

Useful cmake command line options

NB: Include these on the command line using -D=

  • CMAKE_VERBOSE_MAKEFILE=ON: Build Makefiles that enable debugging missing/mangled command line switches that are (or are not) passed to compilers, et cetera.
  • CMAKE_INSTALL_PREFIX=$(pwd)/install: Install in $(pwd)/install. You can use any writable directory.

Special switches for libdap4

  • USE_ASAN=ON: Turn on the compiler/linker address sanitizer
  • BUILD_DEVELOPER=ON: Turn on developer mode.

Build times

With most of the unit tests added, build and test times were good.

Serial build time on an Apple M4 Pro

make  55.14s user 9.42s system 99% cpu 1:04.91 total

Time to run the unit tests:

100% tests passed, 0 tests failed out of 54

Total Test time (real) =   9.18 sec
make test  2.01s user 0.29s system 24% cpu 9.247 total

Parallel build time:

make -j20  71.36s user 13.38s system 1001% cpu 8.461 total

Time to run the unit tests:

100% tests passed, 0 tests failed out of 54

Total Test time (real) =   2.35 sec
make test -j20  2.20s user 0.14s system 98% cpu 2.381 total