build: support MinGW-w64 with Meson

MinGW-w64 linker does not mimic MS linker options, so the build system
must differentiate between linkers on Windows. Use GNU linker options
with GCC and MS linker options with Clang.

MinGW-w64 by default uses MSVCRT stdio, which does not comply to ANSI,
most notably its formatting and string handling functions. MinGW-w64
support for the Universal CRT (UCRT) is ongoing, but the toolchain
provides its own standard-complying implementation of stdio. The latter
is used in the patch to support formatting in DPDK.

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Tested-by: William Tu <u9012063@gmail.com>
Tested-by: Pallavi Kadam <pallavi.kadam@intel.com>

diff --git a/config/meson.build b/config/meson.build
index d3d2370..68aeb84 100644 (file)
--- a/config/meson.build
+++ b/config/meson.build
@@ -14,6 +14,10 @@ foreach env:supported_exec_envs
        set_variable('is_' + env, exec_env == env)
 endforeach
 
+# MS linker requires special treatment.
+# TODO: use cc.get_linker_id() with Meson >= 0.54
+is_ms_linker = is_windows and (cc.get_id() == 'clang')
+
 # set the major version, which might be used by drivers and libraries
 # depending on the configuration options
 pver = meson.project_version().split('.')
@@ -247,6 +251,16 @@ if is_freebsd
        add_project_arguments('-D__BSD_VISIBLE', language: 'c')
 endif
 
+if is_windows
+       # Minimum supported API is Windows 7.
+       add_project_arguments('-D_WIN32_WINNT=0x0601', language: 'c')
+
+       # Use MinGW-w64 stdio, because DPDK assumes ANSI-compliant formatting.
+       if cc.get_id() == 'gcc'
+               add_project_arguments('-D__USE_MINGW_ANSI_STDIO', language: 'c')
+       endif
+endif
+
 if get_option('b_lto')
        if cc.has_argument('-ffat-lto-objects')
                add_project_arguments('-ffat-lto-objects', language: 'c')

diff --git a/doc/guides/windows_gsg/build_dpdk.rst b/doc/guides/windows_gsg/build_dpdk.rst
index 6711e07..a0e51df 100644 (file)
--- a/doc/guides/windows_gsg/build_dpdk.rst
+++ b/doc/guides/windows_gsg/build_dpdk.rst
@@ -7,15 +7,22 @@ Compiling the DPDK Target from Source
 System Requirements
 -------------------
 
-The DPDK and its applications require the Clang-LLVM C compiler
-and Microsoft MSVC linker.
+Building the DPDK and its applications requires one of the following
+environments:
+
+* The Clang-LLVM C compiler and Microsoft MSVC linker.
+* The MinGW-w64 toolchain (either native or cross).
+
 The Meson Build system is used to prepare the sources for compilation
 with the Ninja backend.
 The installation of these tools is covered in this section.
 
 
+Option 1. Clang-LLVM C Compiler and Microsoft MSVC Linker
+---------------------------------------------------------
+
 Install the Compiler
---------------------
+~~~~~~~~~~~~~~~~~~~~
 
 Download and install the clang compiler from
 `LLVM website <http://releases.llvm.org/download.html>`_.
@@ -25,7 +32,7 @@ For example, Clang-LLVM direct download link::
 
 
 Install the Linker
-------------------
+~~~~~~~~~~~~~~~~~~
 
 Download and install the Build Tools for Visual Studio to link and build the
 files on windows,
@@ -34,6 +41,18 @@ When installing build tools, select the "Visual C++ build tools" option
 and ensure the Windows SDK is selected.
 
 
+Option 2. MinGW-w64 Toolchain
+-----------------------------
+
+Obtain the latest version from
+`MinGW-w64 website <http://mingw-w64.org/doku.php/download>`_.
+On Windows, install to a folder without spaces in its name, like ``C:\MinGW``.
+This path is assumed for the rest of this guide.
+
+Version 4.0.4 for Ubuntu 16.04 cannot be used due to a
+`MinGW-w64 bug <https://sourceforge.net/p/mingw-w64/bugs/562/>`_.
+
+
 Install the Build System
 ------------------------
 
@@ -43,6 +62,8 @@ A good option to choose is the MSI installer for both meson and ninja together::
 
        http://mesonbuild.com/Getting-meson.html#installing-meson-and-ninja-with-the-msi-installer%22
 
+Recommended version is either Meson 0.47.1 (baseline) or the latest release.
+
 Install the Backend
 -------------------
 
@@ -56,23 +77,30 @@ Build the code
 The build environment is setup to build the EAL and the helloworld example by
 default.
 
-Using the ninja backend
-~~~~~~~~~~~~~~~~~~~~~~~~
+Option 1. Native Build on Windows
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Specifying the compiler might be required to complete the meson command.
+When using Clang-LLVM, specifying the compiler might be required to complete
+the meson command:
 
 .. code-block:: console
 
     set CC=clang
 
+When using MinGW-w64, it is sufficient to have toolchain executables in PATH:
+
+.. code-block:: console
+
+    set PATH=C:\MinGW\mingw64\bin;%PATH%
+
 To compile the examples, the flag ``-Dexamples`` is required.
 
 .. code-block:: console
 
     cd C:\Users\me\dpdk
     meson -Dexamples=helloworld build
-    cd build
-    ninja
+    ninja -C build
+
 
 Run the helloworld example
 ==========================
@@ -87,3 +115,8 @@ Navigate to the examples in the build directory and run `dpdk-helloworld.exe`.
     hello from core 3
     hello from core 0
     hello from core 2
+
+Note for MinGW-w64: applications are linked to ``libwinpthread-1.dll``
+by default. To run the example, either add toolchain executables directory
+to the PATH or copy the library to the working directory.
+Alternatively, static linking may be used (mind the LGPLv2.1 license).

diff --git a/lib/meson.build b/lib/meson.build
index 0af3efa..9c3cc55 100644 (file)
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -148,12 +148,16 @@ foreach l:libraries
                                command: [map_to_def_cmd, '@INPUT@', '@OUTPUT@'],
                                input: version_map,
                                output: 'rte_@0@_exports.def'.format(name))
-                       lk_deps = [version_map, def_file]
-                       if is_windows
+
+                       if is_ms_linker
                                lk_args = ['-Wl,/def:' + def_file.full_path(),
                                        '-Wl,/implib:lib\\' + implib]
                        else
                                lk_args = ['-Wl,--version-script=' + version_map]
+                       endif
+
+                       lk_deps = [version_map, def_file]
+                       if not is_windows
                                # on unix systems check the output of the
                                # experimental syms script, using it as a
                                # dependency of the .so build