feat(ar): use lib instead of ar on Windows

if ar isn't available

Author: everythingfunctional

src/fpm.f90

@@ -4,7 +4,7 @@ module fpm
 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: get_os_type, run, OS_UNKNOWN, OS_WINDOWS
 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, &
@@ -62,6 +62,23 @@ subroutine build_model(model, settings, package, error)
         model%fortran_compiler = settings%compiler
     endif
 
+    associate(os_type => get_os_type())
+        if (os_type /= OS_WINDOWS .and. os_type /= OS_UNKNOWN) then
+            model%archiver = "ar -rs "
+        else
+            block
+                integer :: estat
+
+                call execute_command_line("ar --version", exitstat=estat)
+                if (estat /= 0) then
+                    model%archiver = "lib /OUT:"
+                else
+                    model%archiver = "ar -rs "
+                end if
+            end block
+        end if
+    end associate
+
     if (is_unknown_compiler(model%fortran_compiler)) then
         write(*, '(*(a:,1x))') &
             "<WARN>", "Unknown compiler", model%fortran_compiler, "requested!", &
@@ -147,7 +164,7 @@ subroutine build_model(model, settings, package, error)
             if (.not.allocated(model%packages(i)%sources)) allocate(model%packages(i)%sources(0))
 
             if (allocated(dependency%library)) then
-                
+
                 if (allocated(dependency%library%source_dir)) then
                     lib_dir = join_path(dep%proj_dir, dependency%library%source_dir)
                     if (is_dir(lib_dir)) then
@@ -165,7 +182,7 @@ subroutine build_model(model, settings, package, error)
                         end if
                     end do
                 end if
-                
+
             end if
 
             if (allocated(dependency%build%link)) then
@@ -178,8 +195,8 @@ 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> COMPILER OPTIONS:  ', model%fortran_compile_flags 
-        write(*,*)'<INFO> INCLUDE DIRECTORIES:  [', string_cat(model%include_dirs,','),']' 
+        write(*,*)'<INFO> COMPILER OPTIONS:  ', model%fortran_compile_flags
+        write(*,*)'<INFO> INCLUDE DIRECTORIES:  [', string_cat(model%include_dirs,','),']'
      end if
 
     ! Check for duplicate modules
@@ -190,7 +207,7 @@ subroutine build_model(model, settings, package, error)
 end subroutine build_model
 
 ! Check for duplicate modules
-subroutine check_modules_for_duplicates(model, duplicates_found) 
+subroutine check_modules_for_duplicates(model, duplicates_found)
     type(fpm_model_t), intent(in) :: model
     integer :: maxsize
     integer :: i,j,k,l,m,modi
@@ -370,7 +387,7 @@ subroutine cmd_run(settings,test)
 
     ! Check all names are valid
     ! or no name and found more than one file
-    toomany= size(settings%name).eq.0 .and. size(executables).gt.1 
+    toomany= size(settings%name).eq.0 .and. size(executables).gt.1
     if ( any(.not.found) &
     & .or. &
     & ( (toomany .and. .not.test) .or.  (toomany .and. settings%runner .ne. '') ) &
@@ -420,7 +437,7 @@ subroutine cmd_run(settings,test)
             end if
         end do
     endif
-    contains 
+    contains
     subroutine compact_list_all()
     integer, parameter :: LINE_WIDTH = 80
     integer :: i, j, nCol

src/fpm_backend.f90

@@ -1,28 +1,28 @@
 !># Build backend
-!> Uses a list of `[[build_target_ptr]]` and a valid `[[fpm_model]]` instance 
+!> Uses a list of `[[build_target_ptr]]` and a valid `[[fpm_model]]` instance
 !> to schedule and execute the compilation and linking of package targets.
-!> 
+!>
 !> The package build process (`[[build_package]]`) comprises three steps:
 !>
 !> 1. __Target sorting:__ topological sort of the target dependency graph (`[[sort_target]]`)
 !> 2. __Target scheduling:__ group targets into schedule regions based on the sorting (`[[schedule_targets]]`)
 !> 3. __Target building:__ generate targets by compilation or linking
-!> 
+!>
 !> @note If compiled with OpenMP, targets will be build in parallel where possible.
 !>
 !>### Incremental compilation
-!> The backend process supports *incremental* compilation whereby targets are not 
+!> The backend process supports *incremental* compilation whereby targets are not
 !> re-compiled if their corresponding dependencies have not been modified.
-!> 
+!>
 !> - Source-based targets (*i.e.* objects) are not re-compiled if the corresponding source
 !>   file is unmodified AND all of the target dependencies are not marked for re-compilation
 !>
-!> - Link targets (*i.e.* executables and libraries) are not re-compiled if the 
+!> - Link targets (*i.e.* executables and libraries) are not re-compiled if the
 !>   target output file already exists AND all of the target dependencies are not marked for
 !>   re-compilation
 !>
 !> Source file modification is determined by a file digest (hash) which is calculated during
-!> the source parsing phase ([[fpm_source_parsing]]) and cached to disk after a target is 
+!> the source parsing phase ([[fpm_source_parsing]]) and cached to disk after a target is
 !> successfully generated.
 !>
 module fpm_backend
@@ -32,7 +32,7 @@ module fpm_backend
 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_strings, only: string_cat
 
 implicit none
@@ -58,9 +58,9 @@ subroutine build_package(targets,model)
 
     ! Perform depth-first topological sort of targets
     do i=1,size(targets)
-        
+
         call sort_target(targets(i)%ptr)
-        
+
     end do
 
     ! Construct build schedule queue
@@ -78,20 +78,20 @@ subroutine build_package(targets,model)
         end do
 
     end do
-    
+
 end subroutine build_package
 
 
-!> Topologically sort a target for scheduling by 
+!> Topologically sort a target for scheduling by
 !>  recursing over its dependencies.
-!> 
+!>
 !> Checks disk-cached source hashes to determine if objects are
 !>  up-to-date. Up-to-date sources are tagged as skipped.
 !>
-!> On completion, `target` should either be marked as 
+!> On completion, `target` should either be marked as
 !> sorted (`target%sorted=.true.`) or skipped (`target%skip=.true.`)
 !>
-!> If `target` is marked as sorted, `target%schedule` should be an 
+!> If `target` is marked as sorted, `target%schedule` should be an
 !> integer greater than zero indicating the region for scheduling
 !>
 recursive subroutine sort_target(target)
@@ -162,7 +162,7 @@ recursive subroutine sort_target(target)
         end if
 
     end do
-    
+
     ! Mark flag as processed: either sorted or skipped
     target%sorted = .not.target%skip
 
@@ -242,12 +242,12 @@ subroutine build_target(model,target)
               // " -o " // target%output_file)
 
     case (FPM_TARGET_EXECUTABLE)
-        
+
         call run(model%fortran_compiler// " " // target%compile_flags &
               //" "//target%link_flags// " -o " // target%output_file)
 
     case (FPM_TARGET_ARCHIVE)
-        call run("ar -rs " // target%output_file // " " // string_cat(target%link_objects," "))
+        call run(model%archiver // target%output_file // " " // string_cat(target%link_objects," "))
 
     end select
 

src/fpm_model.f90

@@ -1,6 +1,6 @@
 !># The fpm package model
 !>
-!> Defines the fpm model data types which encapsulate all information 
+!> Defines the fpm model data types which encapsulate all information
 !> required to correctly build a package and its dependencies.
 !>
 !> The process (see `[[build_model(subroutine)]]`) for generating a valid `[[fpm_model]]` involves
@@ -117,6 +117,9 @@ module fpm_model
     !> Command line name to invoke fortran compiler
     character(:), allocatable :: fortran_compiler
 
+    !> Command line to invoke for creating static library
+    character(:), allocatable :: archiver
+
     !> Command line flags passed to fortran for compilation
     character(:), allocatable :: fortran_compile_flags
 
@@ -128,7 +131,7 @@ module fpm_model
 
     !> Native libraries to link against
     type(string_t), allocatable :: link_libraries(:)
-    
+
     !> Project dependencies
     type(dependency_tree_t) :: deps