Replace language_support module with builtin CheckLanguage

The workaround_9220 function was introduced a long time ago to
workaround a CMake issue with enable_language(OPTIONAL). Since then
CMake has clarified that the OPTIONAL keywords has not been
implemented[0].

A CheckLanguage module is now provided with CMake to check if a language
can be enabled. Use that instead.

[0] https://cmake.org/cmake/help/v3.18/command/enable_language.html
4 files changed
tree: 2be47187c3f0238a3d93951a0e7a96fa3f552a9c
  1. bench/
  2. blas/
  3. ci/
  4. cmake/
  5. debug/
  6. demos/
  7. doc/
  8. Eigen/
  9. failtest/
  10. lapack/
  11. scripts/
  12. test/
  13. unsupported/
  14. .gitignore
  15. .gitlab-ci.yml
  16. .hgeol
  17. CMakeLists.txt
  18. COPYING.APACHE
  19. COPYING.BSD
  20. COPYING.GPL
  21. COPYING.LGPL
  22. COPYING.MINPACK
  23. COPYING.MPL2
  24. COPYING.README
  25. CTestConfig.cmake
  26. CTestCustom.cmake.in
  27. eigen3.pc.in
  28. INSTALL
  29. README.md
  30. signature_of_eigen3_matrix_library
README.md

Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.

For more information go to http://eigen.tuxfamily.org/.

For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.