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Replace language_support module with builtin CheckLanguage

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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
This commit is contained in:
Samir Benmendil
2020-10-12 12:24:08 +01:00
parent 3f4684f87d
commit 288d456c29
4 changed files with 21 additions and 97 deletions
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16
lapack/CMakeLists.txt
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@@ -1,15 +1,13 @@
project(EigenLapack CXX)
include("../cmake/language_support.cmake")
workaround_9220(Fortran EIGEN_Fortran_COMPILER_WORKS)
if(EIGEN_Fortran_COMPILER_WORKS)
enable_language(Fortran OPTIONAL)
if(NOT CMAKE_Fortran_COMPILER)
set(EIGEN_Fortran_COMPILER_WORKS OFF)
endif()
include(CheckLanguage)
check_language(Fortran)
if(CMAKE_Fortran_COMPILER)
enable_language(Fortran)
set(EIGEN_Fortran_COMPILER_WORKS ON)
else()
set(EIGEN_Fortran_COMPILER_WORKS OFF)
endif()
add_custom_target(lapack)