Adds test in the CI for the installation of CBLAS and LAPACKE without Fortran compiler

Author: weslleyspereira

.github/workflows/cmake.yml

@@ -151,3 +151,34 @@ jobs:
         echo "Coverage"
         cmake --build build --target coverage
         bash <(curl -s https://codecov.io/bash) -X gcov
+
+  test-install-cblas-lapacke-without-fortran-compiler:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout LAPACK
+      uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+
+    - name: Install ninja-build tool
+      uses: seanmiddleditch/gha-setup-ninja@16b940825621068d98711680b6c3ff92201f8fc0 # v3
+
+    - name: Install basics
+      run: |
+        sudo apt update
+        sudo apt install -y cmake liblapack-dev libblas-dev
+        sudo apt purge gfortran
+
+    - name: Configure CMake
+      run: >
+        cmake -B build -G Ninja
+        -D CMAKE_BUILD_TYPE=Release
+        -D CMAKE_INSTALL_PREFIX=${{github.workspace}}/lapack_install
+        -D CBLAS:BOOL=ON
+        -D LAPACKE:BOOL=ON
+        -D USE_OPTIMIZED_BLAS:BOOL=ON
+        -D USE_OPTIMIZED_LAPACK:BOOL=ON
+        -D BUILD_TESTING:BOOL=OFF
+        -D LAPACKE_WITH_TMG:BOOL=OFF
+        -D BUILD_SHARED_LIBS:BOOL=ON
+
+    - name: Install
+      run: cmake --build build --target install -j2

CMakeLists.txt

@@ -278,18 +278,27 @@ endif()
 
 # Check the usage of the user provided or automatically found LAPACK libraries
 if(LAPACK_LIBRARIES)
-  include(CheckFortranFunctionExists)
-  set(CMAKE_REQUIRED_LIBRARIES ${LAPACK_LIBRARIES})
-  # Check if new routine of 3.4.0 is in LAPACK_LIBRARIES
-  CHECK_FORTRAN_FUNCTION_EXISTS("dgeqrt" LATESTLAPACK_FOUND)
-  unset(CMAKE_REQUIRED_LIBRARIES)
-  if(LATESTLAPACK_FOUND)
-    message(STATUS "--> LAPACK supplied by user is WORKING, will use ${LAPACK_LIBRARIES}.")
+  include(CheckLanguage)
+  check_language(Fortran)
+  if(CMAKE_Fortran_COMPILER)
+    enable_language(Fortran)
+    include(CheckFortranFunctionExists)
+    set(CMAKE_REQUIRED_LIBRARIES ${LAPACK_LIBRARIES})
+    # Check if new routine of 3.4.0 is in LAPACK_LIBRARIES
+    CHECK_FORTRAN_FUNCTION_EXISTS("dgeqrt" LATESTLAPACK_FOUND)
+    unset(CMAKE_REQUIRED_LIBRARIES)
+    if(LATESTLAPACK_FOUND)
+      message(STATUS "--> LAPACK supplied by user is WORKING, will use ${LAPACK_LIBRARIES}.")
+    else()
+      message(ERROR "--> LAPACK supplied by user is not WORKING or is older than LAPACK 3.4.0, CANNOT USE ${LAPACK_LIBRARIES}.")
+      message(ERROR "-->     Will use REFERENCE LAPACK (by default)")
+      message(ERROR "-->     Or Correct your LAPACK_LIBRARIES entry ")
+      message(ERROR "-->     Or Consider checking USE_OPTIMIZED_LAPACK")
+    endif()
   else()
-    message(ERROR "--> LAPACK supplied by user is not WORKING or is older than LAPACK 3.4.0, CANNOT USE ${LAPACK_LIBRARIES}.")
-    message(ERROR "-->     Will use REFERENCE LAPACK (by default)")
-    message(ERROR "-->     Or Correct your LAPACK_LIBRARIES entry ")
-    message(ERROR "-->     Or Consider checking USE_OPTIMIZED_LAPACK")
+    message(STATUS "--> LAPACK supplied by user is ${LAPACK_LIBRARIES}.")
+    message(STATUS "--> CMake couldn't find a Fortran compiler, so it cannot check if the provided LAPACK library works.")
+    set(LATESTLAPACK_FOUND TRUE)
   endif()
 endif()
 
@@ -350,6 +359,7 @@ endif()
 # Cache export target
 set(LAPACK_INSTALL_EXPORT_NAME_CACHE ${LAPACK_INSTALL_EXPORT_NAME})
 if(BUILD_TESTING OR LAPACKE_WITH_TMG)
+  enable_language(Fortran)
   if(LATESTLAPACK_FOUND AND LAPACKE_WITH_TMG)
     set(CMAKE_REQUIRED_LIBRARIES ${LAPACK_LIBRARIES})
     # Check if dlatms (part of tmg) is found