Modularize BLAS and LAPACK modules in CMake to make it easier to use in external projects

src/CMakeLists.txt

@@ -1,6 +1,157 @@
-#### Pre-process: .fpp -> .f90 via Fypp
+# Helper function to configure stdlib targets
+function(configure_stdlib_target target_name regular_sources_var fypp_files_var cpp_files_var)
+    #### Pre-process: .fpp -> .f90 via Fypp
+    fypp_f90("${fyppFlags}" "${${fypp_files_var}}" ${target_name}_fypp_outFiles)
+    #### Pre-process: .fypp -> .F90 via Fypp (for C preprocessor directives)
+    fypp_f90pp("${fyppFlags}" "${${cpp_files_var}}" ${target_name}_cpp_outFiles)
+
+    list(APPEND all_sources ${${target_name}_fypp_outFiles})
+    list(APPEND all_sources ${${target_name}_cpp_outFiles})
+    list(APPEND all_sources ${${regular_sources_var}})
+
+    add_library(${target_name} ${all_sources})
+    add_library(${PROJECT_NAME}::${target_name} ALIAS ${target_name})
+
+    set_target_properties(
+      ${target_name}
+      PROPERTIES
+      POSITION_INDEPENDENT_CODE ON
+      WINDOWS_EXPORT_ALL_SYMBOLS ON
+    )
+
+    if(CMAKE_Fortran_COMPILER_ID STREQUAL GNU AND CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 10.0)
+        target_compile_options(
+          ${target_name}
+          PRIVATE
+          $<$<COMPILE_LANGUAGE:Fortran>:-fno-range-check>
+        )
+    endif()
+
+    set(LIB_MOD_DIR ${CMAKE_CURRENT_BINARY_DIR}/mod_files/${target_name}/)
+    set(INSTALL_MOD_DIR "${CMAKE_INSTALL_MODULEDIR}/${target_name}")
+    # We need the module directory before we finish the configure stage since the
+    # build interface might resolve before the module directory is generated by CMake
+    if(NOT EXISTS "${LIB_MOD_DIR}")
+      file(MAKE_DIRECTORY "${LIB_MOD_DIR}")
+    endif()
+
+    set_target_properties(${target_name} PROPERTIES
+        Fortran_MODULE_DIRECTORY ${LIB_MOD_DIR}
+    )
+    target_include_directories(${target_name} PUBLIC
+        $<BUILD_INTERFACE:${LIB_MOD_DIR}>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_MODULEDIR}>
+    )
+
+    install(TARGETS ${target_name}
+            EXPORT ${PROJECT_NAME}-targets
+            RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+            ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+            LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    )
+    install(DIRECTORY ${LIB_MOD_DIR} DESTINATION "${INSTALL_MOD_DIR}")
+endfunction()
+
+set(blas_fppFiles
+    stdlib_kinds.fypp
+    blas/stdlib_blas_constants.fypp
+    blas/stdlib_blas.fypp
+    blas/stdlib_blas_level1.fypp
+    blas/stdlib_blas_level2_ban.fypp
+    blas/stdlib_blas_level2_gen.fypp
+    blas/stdlib_blas_level2_pac.fypp
+    blas/stdlib_blas_level2_sym.fypp
+    blas/stdlib_blas_level2_tri.fypp
+    blas/stdlib_blas_level3_gen.fypp
+    blas/stdlib_blas_level3_sym.fypp
+    blas/stdlib_blas_level3_tri.fypp
+    blas/stdlib_linalg_blas_aux.fypp
+)
+set(blas_cppFiles stdlib_linalg_constants.fypp stdlib_linalg_blas.fypp)
+
+configure_stdlib_target(blas "" blas_fppFiles blas_cppFiles)
+
+if(BLAS_FOUND)
+    target_link_libraries(blas PUBLIC "BLAS::BLAS")
+endif()
+
+set(lapack_fppFiles
+    stdlib_kinds.fypp
+    stdlib_linalg_state.fypp
+    stdlib_error.fypp
+    stdlib_optval.fypp
+    stdlib_io.fypp
+    stdlib_ascii.fypp
+    stdlib_string_type.fypp
+    lapack/stdlib_lapack_base.fypp
+    lapack/stdlib_lapack_solve.fypp
+    lapack/stdlib_lapack_others.fypp
+    lapack/stdlib_lapack_orthogonal_factors.fypp
+    lapack/stdlib_lapack_eig_svd_lsq.fypp
+    lapack/stdlib_linalg_lapack_aux.fypp
+    lapack/stdlib_lapack_auxiliary.fypp
+    lapack/stdlib_lapack_blas_like_base.fypp
+    lapack/stdlib_lapack_blas_like_l1.fypp
+    lapack/stdlib_lapack_blas_like_l2.fypp
+    lapack/stdlib_lapack_blas_like_l3.fypp
+    lapack/stdlib_lapack_blas_like_mnorm.fypp
+    lapack/stdlib_lapack_blas_like_scalar.fypp
+    lapack/stdlib_lapack_cosine_sine.fypp
+    lapack/stdlib_lapack_cosine_sine2.fypp
+    lapack/stdlib_lapack_eigv_comp.fypp
+    lapack/stdlib_lapack_eigv_comp2.fypp
+    lapack/stdlib_lapack_eigv_gen.fypp
+    lapack/stdlib_lapack_eigv_gen2.fypp
+    lapack/stdlib_lapack_eigv_gen3.fypp
+    lapack/stdlib_lapack_eigv_std_driver.fypp
+    lapack/stdlib_lapack_eigv_svd_bidiag_dc.fypp
+    lapack/stdlib_lapack_eigv_svd_drivers.fypp
+    lapack/stdlib_lapack_eigv_svd_drivers2.fypp
+    lapack/stdlib_lapack_eigv_svd_drivers3.fypp
+    lapack/stdlib_lapack_eigv_sym_comp.fypp
+    lapack/stdlib_lapack_eigv_sym.fypp
+    lapack/stdlib_lapack_eigv_tridiag.fypp
+    lapack/stdlib_lapack_eigv_tridiag2.fypp
+    lapack/stdlib_lapack_eigv_tridiag3.fypp
+    lapack/stdlib_lapack_givens_jacobi_rot.fypp
+    lapack/stdlib_lapack_householder_reflectors.fypp
+    lapack/stdlib_lapack_lsq.fypp
+    lapack/stdlib_lapack_lsq_aux.fypp
+    lapack/stdlib_lapack_lsq_constrained.fypp
+    lapack/stdlib_lapack_orthogonal_factors_ql.fypp
+    lapack/stdlib_lapack_orthogonal_factors_qr.fypp
+    lapack/stdlib_lapack_orthogonal_factors_rz.fypp
+    lapack/stdlib_lapack_others_sm.fypp
+    lapack/stdlib_lapack_solve_aux.fypp
+    lapack/stdlib_lapack_solve_chol_comp.fypp
+    lapack/stdlib_lapack_solve_chol.fypp
+    lapack/stdlib_lapack_solve_ldl_comp.fypp
+    lapack/stdlib_lapack_solve_ldl_comp2.fypp
+    lapack/stdlib_lapack_solve_ldl_comp3.fypp
+    lapack/stdlib_lapack_solve_ldl_comp4.fypp
+    lapack/stdlib_lapack_solve_ldl.fypp
+    lapack/stdlib_lapack_solve_lu_comp.fypp
+    lapack/stdlib_lapack_solve_lu.fypp
+    lapack/stdlib_lapack_solve_tri_comp.fypp
+    lapack/stdlib_lapack_svd_bidiag_qr.fypp
+    lapack/stdlib_lapack_svd_comp.fypp
+    lapack/stdlib_lapack_svd_comp2.fypp
+)
+set(lapack_cppFiles
+    stdlib_linalg_constants.fypp
+    stdlib_linalg_lapack.fypp
+)
+set(lapack_f90Files
+    $<IF:$<BOOL:${f18errorstop}>,f18estop.f90,f08estop.f90>
+)
+
+configure_stdlib_target(lapack lapack_f90Files lapack_fppFiles lapack_cppFiles)
+
+if(LAPACK_FOUND)
+    target_link_libraries(lapack PUBLIC "LAPACK::LAPACK")
+endif()
+target_link_libraries(lapack PUBLIC blas)
 
-# Create a list of the files to be preprocessed
 set(fppFiles
     stdlib_ascii.fypp
     stdlib_bitsets.fypp
@@ -89,21 +240,8 @@ set(fppFiles
     stdlib_strings.fypp
     stdlib_version.fypp
 )
-
-# Preprocessed files to contain preprocessor directives -> .F90
-set(cppFiles
-    stdlib_linalg_constants.fypp
-    stdlib_linalg_blas.fypp
-    stdlib_linalg_lapack.fypp
-)
-
-add_subdirectory(blas)
-add_subdirectory(lapack)
-
-fypp_f90("${fyppFlags}" "${fppFiles}" outFiles)
-fypp_f90pp("${fyppFlags}" "${cppFiles}" outPreprocFiles)
-
-set(SRC
+set(cppFiles stdlib_linalg_constants.fypp)
+set(f90Files
     stdlib_ansi.f90
     stdlib_ansi_operator.f90
     stdlib_ansi_to_string.f90
@@ -124,57 +262,9 @@ set(SRC
     stdlib_specialfunctions_legendre.f90
     stdlib_quadrature_gauss.f90
     stdlib_stringlist_type.f90
-    ${outFiles}
-    ${outPreprocFiles}
-)
-
-add_library(${PROJECT_NAME} ${SRC})
-
-# Link to BLAS and LAPACK
-if(BLAS_FOUND AND LAPACK_FOUND)
-  target_link_libraries(${PROJECT_NAME} "BLAS::BLAS")
-  target_link_libraries(${PROJECT_NAME} "LAPACK::LAPACK")
-endif()
-
-set_target_properties(
-  ${PROJECT_NAME}
-  PROPERTIES
-  POSITION_INDEPENDENT_CODE ON
-  WINDOWS_EXPORT_ALL_SYMBOLS ON
-)
-
-if(CMAKE_Fortran_COMPILER_ID STREQUAL GNU AND CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 10.0)
-  target_compile_options(
-     ${PROJECT_NAME}
-     PRIVATE
-     $<$<COMPILE_LANGUAGE:Fortran>:-fno-range-check>
-   )
-endif()
-
-set(LIB_MOD_DIR ${CMAKE_CURRENT_BINARY_DIR}/mod_files/)
-# We need the module directory before we finish the configure stage since the
-# build interface might resolve before the module directory is generated by CMake
-if(NOT EXISTS "${LIB_MOD_DIR}")
-  file(MAKE_DIRECTORY "${LIB_MOD_DIR}")
-endif()
-
-set_target_properties(${PROJECT_NAME} PROPERTIES
-    Fortran_MODULE_DIRECTORY ${LIB_MOD_DIR})
-target_include_directories(${PROJECT_NAME} PUBLIC
-    $<BUILD_INTERFACE:${LIB_MOD_DIR}>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_MODULEDIR}>
+    $<IF:$<BOOL:${f18errorstop}>,f18estop.f90,f08estop.f90>
 )
 
-if(f18errorstop)
-  target_sources(${PROJECT_NAME} PRIVATE f18estop.f90)
-else()
-  target_sources(${PROJECT_NAME} PRIVATE f08estop.f90)
-endif()
+configure_stdlib_target(${PROJECT_NAME} f90Files fppFiles cppFiles)
 
-install(TARGETS ${PROJECT_NAME}
-        EXPORT ${PROJECT_NAME}-targets
-        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-)
-install(DIRECTORY ${LIB_MOD_DIR} DESTINATION "${CMAKE_INSTALL_MODULEDIR}")
+target_link_libraries(${PROJECT_NAME} PUBLIC blas lapack)