Merge pull request #433 from LKedward/intel-c

Fix to allow compiling C with Intel CC

5 files changed, 57 insertions, 12 deletions

diff --git a/src/fpm.f90 b/src/fpm.f90
index a62ffe0..5e86498 100644
--- a/src/fpm.f90
+++ b/src/fpm.f90
@@ -4,12 +4,12 @@ use fpm_backend, only: build_package
 use fpm_command_line, only: fpm_build_settings, fpm_new_settings, &
                       fpm_run_settings, fpm_install_settings, fpm_test_settings
 use fpm_dependency, only : new_dependency_tree
-use fpm_environment, only: run
+use fpm_environment, only: run, get_env
 use fpm_filesystem, only: is_dir, join_path, number_of_rows, list_files, exists, basename
 use fpm_model, only: fpm_model_t, srcfile_t, show_model, &
                     FPM_SCOPE_UNKNOWN, FPM_SCOPE_LIB, FPM_SCOPE_DEP, &
                     FPM_SCOPE_APP, FPM_SCOPE_EXAMPLE, FPM_SCOPE_TEST
-use fpm_compiler, only: get_module_flags, is_unknown_compiler
+use fpm_compiler, only: get_module_flags, is_unknown_compiler, get_default_c_compiler
 
 
 use fpm_sources, only: add_executable_sources, add_sources_from_dir
@@ -63,6 +63,9 @@ subroutine build_model(model, settings, package, error)
         model%fortran_compiler = settings%compiler
     endif
 
+    call get_default_c_compiler(model%fortran_compiler, model%c_compiler)
+    model%c_compiler = get_env('FPM_C_COMPILER',model%c_compiler)
+
     if (is_unknown_compiler(model%fortran_compiler)) then
         write(*, '(*(a:,1x))') &
             "<WARN>", "Unknown compiler", model%fortran_compiler, "requested!", &
@@ -183,6 +186,7 @@ subroutine build_model(model, settings, package, error)
     if (settings%verbose) then
         write(*,*)'<INFO> BUILD_NAME: ',settings%build_name
         write(*,*)'<INFO> COMPILER:  ',settings%compiler
+        write(*,*)'<INFO> C COMPILER:  ',model%c_compiler
         write(*,*)'<INFO> COMPILER OPTIONS:  ', model%fortran_compile_flags 
         write(*,*)'<INFO> INCLUDE DIRECTORIES:  [', string_cat(model%include_dirs,','),']' 
      end if
diff --git a/src/fpm_backend.f90 b/src/fpm_backend.f90
index 74cef61..8c4cf40 100644
--- a/src/fpm_backend.f90
+++ b/src/fpm_backend.f90
@@ -30,8 +30,8 @@ module fpm_backend
 use fpm_environment, only: run
 use fpm_filesystem, only: dirname, join_path, exists, mkdir
 use fpm_model, only: fpm_model_t
-use fpm_targets, only: build_target_t, build_target_ptr, &
-                     FPM_TARGET_OBJECT, FPM_TARGET_ARCHIVE, FPM_TARGET_EXECUTABLE
+use fpm_targets, only: build_target_t, build_target_ptr, FPM_TARGET_OBJECT, &
+                       FPM_TARGET_C_OBJECT, FPM_TARGET_ARCHIVE, FPM_TARGET_EXECUTABLE
                      
 use fpm_strings, only: string_cat
 
@@ -241,6 +241,10 @@ subroutine build_target(model,target)
         call run(model%fortran_compiler//" -c " // target%source%file_name // target%compile_flags &
               // " -o " // target%output_file)
 
+    case (FPM_TARGET_C_OBJECT)
+        call run(model%c_compiler//" -c " // target%source%file_name // target%compile_flags &
+                // " -o " // target%output_file)
+
     case (FPM_TARGET_EXECUTABLE)
         
         call run(model%fortran_compiler// " " // target%compile_flags &
diff --git a/src/fpm_compiler.f90 b/src/fpm_compiler.f90
index a499bb9..ca0f4d7 100644
--- a/src/fpm_compiler.f90
+++ b/src/fpm_compiler.f90
@@ -332,6 +332,34 @@ subroutine get_module_flags(compiler, modpath, flags)
 
 end subroutine get_module_flags
 
+subroutine get_default_c_compiler(f_compiler, c_compiler)
+    character(len=*), intent(in) :: f_compiler
+    character(len=:), allocatable, intent(out) :: c_compiler
+    integer(compiler_enum) :: id
+
+    id = get_compiler_id(f_compiler)
+
+    select case(id)
+
+    case(id_intel_classic_nix, id_intel_classic_mac, id_intel_classic_windows, id_intel_classic_unknown)
+        c_compiler = 'icc'
+
+    case(id_intel_llvm_nix,id_intel_llvm_windows, id_intel_llvm_unknown)
+        c_compiler = 'icx'
+
+    case(id_flang)
+        c_compiler='clang'
+
+    case(id_ibmxl)
+        c_compiler='xlc'
+
+    case default
+        ! Fall-back to using Fortran compiler
+        c_compiler = f_compiler
+    end select
+
+end subroutine get_default_c_compiler
+
 function get_compiler_id(compiler) result(id)
     character(len=*), intent(in) :: compiler
     integer(kind=compiler_enum) :: id
diff --git a/src/fpm_model.f90 b/src/fpm_model.f90
index ec366d6..b8a4143 100644
--- a/src/fpm_model.f90
+++ b/src/fpm_model.f90
@@ -117,6 +117,9 @@ type :: fpm_model_t
     !> Command line name to invoke fortran compiler
     character(:), allocatable :: fortran_compiler
 
+    !> Command line name to invoke c compiler
+    character(:), allocatable :: c_compiler
+
     !> Command line flags passed to fortran for compilation
     character(:), allocatable :: fortran_compile_flags
 
diff --git a/src/fpm_targets.f90 b/src/fpm_targets.f90
index 671145d..c247232 100644
--- a/src/fpm_targets.f90
+++ b/src/fpm_targets.f90
@@ -35,7 +35,8 @@ implicit none
 private
 
 public FPM_TARGET_UNKNOWN, FPM_TARGET_EXECUTABLE, &
-       FPM_TARGET_ARCHIVE, FPM_TARGET_OBJECT
+       FPM_TARGET_ARCHIVE, FPM_TARGET_OBJECT, &
+       FPM_TARGET_C_OBJECT
 public build_target_t, build_target_ptr
 public targets_from_sources, resolve_module_dependencies
 public resolve_target_linking, add_target, add_dependency
@@ -50,7 +51,8 @@ integer, parameter :: FPM_TARGET_EXECUTABLE = 1
 integer, parameter :: FPM_TARGET_ARCHIVE = 2
 !> Target type is compiled object
 integer, parameter :: FPM_TARGET_OBJECT = 3
-
+!> Target type is c compiled object
+integer, parameter :: FPM_TARGET_C_OBJECT = 4
 
 !> Wrapper type for constructing arrays of `[[build_target_t]]` pointers
 type build_target_ptr
@@ -194,7 +196,8 @@ subroutine build_target_list(targets,model)
                 case (FPM_UNIT_MODULE,FPM_UNIT_SUBMODULE,FPM_UNIT_SUBPROGRAM,FPM_UNIT_CSOURCE)
 
                     call add_target(targets,source = sources(i), &
-                                type = FPM_TARGET_OBJECT,&
+                                type = merge(FPM_TARGET_C_OBJECT,FPM_TARGET_OBJECT,&
+                                               sources(i)%unit_type==FPM_UNIT_CSOURCE), &
                                 output_file = get_object_name(sources(i)))
 
                     if (with_lib .and. sources(i)%unit_scope == FPM_SCOPE_LIB) then
@@ -448,7 +451,7 @@ subroutine resolve_target_linking(targets, model)
 
     integer :: i
     character(:), allocatable :: global_link_flags
-    character(:), allocatable :: global_compile_flags
+    character(:), allocatable :: global_include_flags
 
     if (size(targets) == 0) return
 
@@ -458,17 +461,16 @@ subroutine resolve_target_linking(targets, model)
         allocate(character(0) :: global_link_flags)
     end if
 
-    global_compile_flags = model%fortran_compile_flags
-
     if (allocated(model%link_libraries)) then
         if (size(model%link_libraries) > 0) then
             global_link_flags = global_link_flags // " -l" // string_cat(model%link_libraries," -l")
         end if
     end if
 
+    allocate(character(0) :: global_include_flags)
     if (allocated(model%include_dirs)) then
         if (size(model%include_dirs) > 0) then
-            global_compile_flags = global_compile_flags // &
+            global_include_flags = global_include_flags // &
             & " -I" // string_cat(model%include_dirs," -I")
         end if
     end if
@@ -477,7 +479,11 @@ subroutine resolve_target_linking(targets, model)
 
         associate(target => targets(i)%ptr)
 
-            target%compile_flags = global_compile_flags
+            if (target%target_type /= FPM_TARGET_C_OBJECT) then
+                target%compile_flags = model%fortran_compile_flags//" "//global_include_flags
+            else
+                target%compile_flags = global_include_flags
+            end if
 
             allocate(target%link_objects(0))