Compilation of LAPACKE possibly independent from Fortran

.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

BLAS/CMakeLists.txt

@@ -1,3 +1,9 @@
+enable_language(Fortran)
+
+# Check for any necessary platform specific compiler flags
+include(CheckLAPACKCompilerFlags)
+CheckLAPACKCompilerFlags()
+
 add_subdirectory(SRC)
 if(BUILD_TESTING)
   add_subdirectory(TESTING)

CBLAS/CMakeLists.txt

@@ -1,15 +1,20 @@
-message(STATUS "CBLAS enable")
+message(STATUS "CBLAS enabled")
 enable_language(C)
 
 set(LAPACK_INSTALL_EXPORT_NAME ${CBLASLIB}-targets)
 
 # Create a header file cblas.h for the routines called in my C programs
-include(FortranCInterface)
-## Ensure that the fortran compiler and c compiler specified are compatible
-FortranCInterface_VERIFY()
-FortranCInterface_HEADER(${LAPACK_BINARY_DIR}/include/cblas_mangling.h
-                         MACRO_NAMESPACE "F77_"
-                         SYMBOL_NAMESPACE "F77_")
+include(CheckLanguage)
+check_language(Fortran)
+if(CMAKE_Fortran_COMPILER)
+  enable_language(Fortran)
+  include(FortranCInterface)
+  ## Ensure that the fortran compiler and c compiler specified are compatible
+  FortranCInterface_VERIFY()
+  FortranCInterface_HEADER(${LAPACK_BINARY_DIR}/include/cblas_mangling.h
+                          MACRO_NAMESPACE "F77_"
+                          SYMBOL_NAMESPACE "F77_")
+endif()
 if(NOT FortranCInterface_GLOBAL_FOUND OR NOT FortranCInterface_MODULE_FOUND)
   message(WARNING "Reverting to pre-defined include/cblas_mangling.h")
     configure_file(include/cblas_mangling_with_flags.h.in

CMAKE/CheckLAPACKCompilerFlags.cmake

@@ -56,13 +56,26 @@ if( CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" )
   if( "${CMAKE_Fortran_FLAGS}" MATCHES "-ffpe-trap=[izoupd]")
     set( FPE_EXIT TRUE )
   endif()
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-frecursive") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -frecursive"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
 
 # Intel Fortran
 elseif( CMAKE_Fortran_COMPILER_ID MATCHES "Intel" )
   if( "${CMAKE_Fortran_FLAGS}" MATCHES "[-/]fpe(-all=|)0" )
     set( FPE_EXIT TRUE )
   endif()
 
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-recursive") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -recursive"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
+
+  if( UNIX AND NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-fp-model[ \t]strict") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fp-model strict")
+  endif()
+
 # SunPro F95
 elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "SunPro" )
   if( ("${CMAKE_Fortran_FLAGS}" MATCHES "-ftrap=") AND
@@ -74,13 +87,33 @@ elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "SunPro" )
          CACHE STRING "Flags for Fortran compiler." FORCE )
   endif()
 
+  if(UNIX)
+    # Delete libmtsk in linking sequence for Sun/Oracle Fortran Compiler.
+    # This library is not present in the Sun package SolarisStudio12.3-linux-x86-bin
+    string(REPLACE \;mtsk\; \; CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES "${CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES}")
+  endif()
+
 # IBM XL Fortran
 elseif( (CMAKE_Fortran_COMPILER_ID STREQUAL "VisualAge" ) OR  # CMake 2.6
         (CMAKE_Fortran_COMPILER_ID STREQUAL "XL" ) )          # CMake 2.8
   if( "${CMAKE_Fortran_FLAGS}" MATCHES "-qflttrap=[a-zA-Z:]:enable" )
     set( FPE_EXIT TRUE )
   endif()
 
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-qrecur") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qrecur"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
+
+  if( UNIX AND NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-qnosave") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qnosave")
+  endif()
+
+
+  if( UNIX AND NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-qstrict") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qstrict")
+  endif()
+
 # HP Fortran
 elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "HP" )
   if( "${CMAKE_Fortran_FLAGS}" MATCHES "\\+fp_exception" )
@@ -138,6 +171,11 @@ elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "NAG" )
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -w=unused")
   endif()
 
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-recursive") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -recursive"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
+
   # Suppress compiler banner and summary
   check_fortran_compiler_flag("-quiet" _quiet)
   if( _quiet AND NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "[-/]quiet") )
@@ -155,7 +193,49 @@ elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "NVHPC" )
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Kieee")
   endif()
 
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-Mrecursive") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Mrecursive"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
+
+# Flang Fortran
+elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "Flang" )
+  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-Mrecursive") )
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Mrecursive"
+      CACHE STRING "Recursive flag must be set" FORCE)
+  endif()
+
+# Compaq Fortran
+elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "Compaq")
+  if(WIN32)
+    if(CMAKE_GENERATOR STREQUAL "NMake Makefiles")
+      get_filename_component(CMAKE_Fortran_COMPILER_CMDNAM ${CMAKE_Fortran_COMPILER} NAME_WE)
+      message(STATUS "Using Compaq Fortran compiler with command name ${CMAKE_Fortran_COMPILER_CMDNAM}")
+      set(cmd ${CMAKE_Fortran_COMPILER_CMDNAM})
+      string(TOLOWER "${cmd}" cmdlc)
+      if(cmdlc STREQUAL "df")
+        message(STATUS "Assume the Compaq Visual Fortran Compiler is being used")
+        set(CMAKE_Fortran_USE_RESPONSE_FILE_FOR_OBJECTS 1)
+        set(CMAKE_Fortran_USE_RESPONSE_FILE_FOR_INCLUDES 1)
+        #This is a workaround that is needed to avoid forward-slashes in the
+        #filenames listed in response files from incorrectly being interpreted as
+        #introducing compiler command options
+        if(${BUILD_SHARED_LIBS})
+          message(FATAL_ERROR "Making of shared libraries with CVF has not been tested.")
+        endif()
+        set(str "NMake version 9 or later should be used. NMake version 6.0 which is\n")
+        set(str "${str}   included with the CVF distribution fails to build Lapack because\n")
+        set(str "${str}   the number of source files exceeds the limit for NMake v6.0\n")
+        message(STATUS ${str})
+        set(CMAKE_Fortran_LINK_EXECUTABLE "LINK /out:<TARGET> <LINK_FLAGS> <LINK_LIBRARIES> <OBJECTS>")
+      endif()
+    endif()
+  endif()
+
 else()
+  message(WARNING "Fortran local arrays should be allocated on the stack."
+    " Please use a compiler which guarantees that feature."
+    " See https://github.com/Reference-LAPACK/lapack/pull/188 and references therein.")
 endif()
 
 if( "${CMAKE_Fortran_FLAGS_RELEASE}" MATCHES "O[3-9]" )