[PATCH v5 1/2] build: build only one library type on Windows

[Tyler Retzlaff <roretzla@linux.microsoft.com>]

MSVC is the only compiler that can produce usable shared libraries for
DPDK on Windows because of the use of exported TLS variables.

Disable building of shared libraries with LLVM and MinGW so that
remaining __declspec macros needed for the functional libraries built by
MSVC can be used without triggering errors in LLVM and MinGW builds.

For Windows only install the default_library type to avoid confusion.
Windows builds cannot build both shared and static in a single pass so
install only the functional variant.

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 config/meson.build  | 24 +++++++++++++++++++
 drivers/meson.build | 59 ++++++++++++++++++++--------------------------
 lib/meson.build     | 67 +++++++++++++++++++++--------------------------------
 3 files changed, 75 insertions(+), 75 deletions(-)

diff --git a/config/meson.build b/config/meson.build
index 8c8b019..9882d33 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -516,4 +516,28 @@ if get_option('default_library') == 'both'
  NOTE: DPDK always builds both shared and static libraries.  Please set
  "default_library" to either "static" or "shared" to select default linkage
  for apps and any examples.''')
+elif get_option('default_library') == 'shared' and is_windows and not is_ms_compiler
+    error( '''
+ Unsupported value "shared" for "default_library" option.
+
+ NOTE: DPDK Windows shared is only supported when building with MSVC. Please set
+ "default_library" to either "static" or use MSVC.''')
+endif
+
+is_shared_enabled=true
+install_static = true
+install_shared = true
+if is_windows
+    install_static = get_option('default_library') == 'static'
+    install_shared = get_option('default_library') == 'shared'
+    if not is_ms_compiler or not install_shared
+        is_shared_enabled = false
+    else
+        # building shared libraries
+        dpdk_conf.set('RTE_BUILD_SHARED_LIB', true)
+
+        # enable export / import of thread_local variables
+        add_project_arguments('/experimental:tlsDllInterface', language: 'c')
+        add_project_link_arguments('/experimental:tlsDllInterface', language: 'c')
+    endif
 endif
diff --git a/drivers/meson.build b/drivers/meson.build
index 66931d4..173403a 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -247,7 +247,7 @@ foreach subpath:subdirs
                 include_directories: includes,
                 dependencies: static_deps,
                 c_args: cflags,
-                install: true)
+                install: install_static)
 
         # now build the shared driver
         version_map = '@0@/@1@/version.map'.format(meson.current_source_dir(), drv_path)
@@ -271,48 +271,39 @@ foreach subpath:subdirs
             endif
         endif
 
-        if is_windows
-            if is_ms_linker
+        if is_shared_enabled
+            if is_ms_compiler
                 def_file = custom_target(lib_name + '_def',
                         command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
                         input: version_map,
                         output: '@0@_exports.def'.format(lib_name))
                 lk_deps += [def_file]
-
-                lk_args = ['-Wl,/def:' + def_file.full_path()]
-                if meson.version().version_compare('<0.54.0')
-                    lk_args += ['-Wl,/implib:drivers\\lib' + lib_name + '.dll.a']
-                endif
+                lk_args = ['/def:' + def_file.full_path()]
             else
-                mingw_map = custom_target(lib_name + '_mingw',
-                        command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
-                        input: version_map,
-                        output: '@0@_mingw.map'.format(lib_name))
-                lk_deps += [mingw_map]
-
-                lk_args = ['-Wl,--version-script=' + mingw_map.full_path()]
+                lk_args = ['-Wl,--version-script=' + version_map]
             endif
-        else
-            lk_args = ['-Wl,--version-script=' + version_map]
         endif
 
-        shared_lib = shared_library(lib_name, sources,
-                objects: objs,
-                include_directories: includes,
-                dependencies: shared_deps,
-                c_args: cflags,
-                link_args: lk_args,
-                link_depends: lk_deps,
-                version: abi_version,
-                soversion: so_version,
-                install: true,
-                install_dir: driver_install_path)
-
-        # create a dependency object and add it to the global dictionary so
-        # testpmd or other built-in apps can find it if necessary
-        shared_dep = declare_dependency(link_with: shared_lib,
-                include_directories: includes,
-                dependencies: shared_deps)
+        shared_dep = {}
+        if is_shared_enabled
+            shared_lib = shared_library(lib_name, sources,
+                    objects: objs,
+                    include_directories: includes,
+                    dependencies: shared_deps,
+                    c_args: cflags,
+                    link_args: lk_args,
+                    link_depends: lk_deps,
+                    version: abi_version,
+                    soversion: so_version,
+                    install: install_shared,
+                    install_dir: driver_install_path)
+
+            # create a dependency object and add it to the global dictionary so
+            # testpmd or other built-in apps can find it if necessary
+            shared_dep = declare_dependency(link_with: shared_lib,
+                    include_directories: includes,
+                    dependencies: shared_deps)
+        endif
         static_dep = declare_dependency(
                 include_directories: includes,
                 dependencies: static_deps)
diff --git a/lib/meson.build b/lib/meson.build
index 179a272..8b28314 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -242,11 +242,13 @@ foreach l:libraries
             c_args: cflags,
             dependencies: static_deps,
             include_directories: includes,
-            install: true)
+            install: install_static)
     static_dep = declare_dependency(
             include_directories: includes,
             dependencies: static_deps)
 
+    dpdk_static_libraries = [static_lib] + dpdk_static_libraries
+
     if not use_function_versioning or is_windows
         # use pre-build objects to build shared lib
         sources = []
@@ -260,33 +262,14 @@ foreach l:libraries
     version_map = '@0@/@1@/version.map'.format(meson.current_source_dir(), l)
     lk_deps = [version_map]
 
-    if is_ms_linker
-        def_file = custom_target(libname + '_def',
-                command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
-                input: version_map,
-                output: '@0@_exports.def'.format(libname))
-        lk_deps += [def_file]
-
+    if is_shared_enabled
         if is_ms_compiler
-            lk_args = ['/def:' + def_file.full_path()]
-            if meson.version().version_compare('<0.54.0')
-                lk_args += ['/implib:lib\\librte_' + l + '.dll.a']
-            endif
-        else
-            lk_args = ['-Wl,/def:' + def_file.full_path()]
-            if meson.version().version_compare('<0.54.0')
-                lk_args += ['-Wl,/implib:lib\\librte_' + l + '.dll.a']
-            endif
-        endif
-    else
-        if is_windows
-            mingw_map = custom_target(libname + '_mingw',
+            def_file = custom_target(libname + '_def',
                     command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
                     input: version_map,
-                    output: '@0@_mingw.map'.format(libname))
-            lk_deps += [mingw_map]
-
-            lk_args = ['-Wl,--version-script=' + mingw_map.full_path()]
+                    output: '@0@_exports.def'.format(libname))
+            lk_deps += [def_file]
+            lk_args = ['/def:' + def_file.full_path()]
         else
             lk_args = ['-Wl,--version-script=' + version_map]
         endif
@@ -304,23 +287,25 @@ foreach l:libraries
                 output: name + '.sym_chk')
     endif
 
-    shared_lib = shared_library(libname,
-            sources,
-            objects: objs,
-            c_args: cflags,
-            dependencies: shared_deps,
-            include_directories: includes,
-            link_args: lk_args,
-            link_depends: lk_deps,
-            version: abi_version,
-            soversion: so_version,
-            install: true)
-    shared_dep = declare_dependency(link_with: shared_lib,
-            include_directories: includes,
-            dependencies: shared_deps)
+    shared_dep = {}
+    if is_shared_enabled
+        shared_lib = shared_library(libname,
+                sources,
+                objects: objs,
+                c_args: cflags,
+                dependencies: shared_deps,
+                include_directories: includes,
+                link_args: lk_args,
+                link_depends: lk_deps,
+                version: abi_version,
+                soversion: so_version,
+                install: install_shared)
+        shared_dep = declare_dependency(link_with: shared_lib,
+                include_directories: includes,
+                dependencies: shared_deps)
 
-    dpdk_libraries = [shared_lib] + dpdk_libraries
-    dpdk_static_libraries = [static_lib] + dpdk_static_libraries
+        dpdk_libraries = [shared_lib] + dpdk_libraries
+    endif
 
     set_variable('shared_rte_' + name, shared_dep)
     set_variable('static_rte_' + name, static_dep)
-- 
1.8.3.1