[dpdk-dev] [PATCH v10 10/10] build: generate version.map file for MinGW on Windows

[talshn@mellanox.com]

From: Tal Shnaiderman <talshn@mellanox.com>

The MinGW build for Windows has special cases where exported
function contain additional prefix:

__emutls_v.per_lcore__*

To avoid adding those prefixed functions to the version.map file
the map_to_def.py script was modified to create a map file for MinGW
with the needed changed.

The file name was changed to map_to_win.py and lib/meson.build map output
was unified with drivers/meson.build output

Signed-off-by: Tal Shnaiderman <talshn@mellanox.com>
---
 buildtools/{map_to_def.py => map_to_win.py} | 11 ++++++++++-
 buildtools/meson.build                      |  4 ++--
 drivers/meson.build                         | 12 +++++++++---
 lib/meson.build                             | 19 ++++++++++++++-----
 4 files changed, 35 insertions(+), 11 deletions(-)
 rename buildtools/{map_to_def.py => map_to_win.py} (69%)

diff --git a/buildtools/map_to_def.py b/buildtools/map_to_win.py
similarity index 69%
rename from buildtools/map_to_def.py
rename to buildtools/map_to_win.py
index 6775b54a9d..2990b58634 100644
--- a/buildtools/map_to_def.py
+++ b/buildtools/map_to_win.py
@@ -10,12 +10,21 @@
 def is_function_line(ln):
     return ln.startswith('\t') and ln.endswith(';\n') and ":" not in ln
 
+# MinGW keeps the original .map file but replaces per_lcore* to __emutls_v.per_lcore*
+def create_mingw_map_file(input_map, output_map):
+    with open(input_map) as f_in, open(output_map, 'w') as f_out:
+        f_out.writelines([lines.replace('per_lcore', '__emutls_v.per_lcore') for lines in f_in.readlines()])
 
 def main(args):
     if not args[1].endswith('version.map') or \
-            not args[2].endswith('exports.def'):
+            not args[2].endswith('exports.def') and \
+            not args[2].endswith('mingw.map'):
         return 1
 
+    if args[2].endswith('mingw.map'):
+        create_mingw_map_file(args[1], args[2])
+        return 0
+
 # special case, allow override if an def file already exists alongside map file
     override_file = join(dirname(args[1]), basename(args[2]))
     if exists(override_file):
diff --git a/buildtools/meson.build b/buildtools/meson.build
index d5f8291beb..f9d2fdf74b 100644
--- a/buildtools/meson.build
+++ b/buildtools/meson.build
@@ -9,14 +9,14 @@ list_dir_globs = find_program('list-dir-globs.py')
 check_symbols = find_program('check-symbols.sh')
 ldflags_ibverbs_static = find_program('options-ibverbs-static.sh')
 
-# set up map-to-def script using python, either built-in or external
+# set up map-to-win script using python, either built-in or external
 python3 = import('python').find_installation(required: false)
 if python3.found()
 	py3 = [python3]
 else
 	py3 = ['meson', 'runpython']
 endif
-map_to_def_cmd = py3 + files('map_to_def.py')
+map_to_win_cmd = py3 + files('map_to_win.py')
 sphinx_wrapper = py3 + files('call-sphinx-build.py')
 
 # stable ABI always starts with "DPDK_"
diff --git a/drivers/meson.build b/drivers/meson.build
index 646a7d5eb5..2cd8505d10 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -152,16 +152,22 @@ foreach class:dpdk_driver_classes
 			implib = 'lib' + lib_name + '.dll.a'
 
 			def_file = custom_target(lib_name + '_def',
-				command: [map_to_def_cmd, '@INPUT@', '@OUTPUT@'],
+				command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
 				input: version_map,
 				output: '@0@_exports.def'.format(lib_name))
-			lk_deps = [version_map, def_file]
+
+			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 = [version_map, def_file, mingw_map]
 			if is_windows
 				if is_ms_linker
 					lk_args = ['-Wl,/def:' + def_file.full_path(),
 						'-Wl,/implib:drivers\\' + implib]
 				else
-					lk_args = []
+					lk_args = ['-Wl,--version-script=' + mingw_map.full_path()]
 				endif
 			else
 				lk_args = ['-Wl,--version-script=' + version_map]
diff --git a/lib/meson.build b/lib/meson.build
index a8fd317a18..af66610fcb 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -149,19 +149,28 @@ foreach l:libraries
 					meson.current_source_dir(), dir_name, name)
 			implib = dir_name + '.dll.a'
 
-			def_file = custom_target(name + '_def',
-				command: [map_to_def_cmd, '@INPUT@', '@OUTPUT@'],
+			def_file = custom_target(libname + '_def',
+				command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
 				input: version_map,
-				output: 'rte_@0@_exports.def'.format(name))
+				output: '@0@_exports.def'.format(libname))
+
+			mingw_map = custom_target(libname + '_mingw',
+				command: [map_to_win_cmd, '@INPUT@', '@OUTPUT@'],
+				input: version_map,
+				output: '@0@_mingw.map'.format(libname))
 
 			if is_ms_linker
 				lk_args = ['-Wl,/def:' + def_file.full_path(),
 					'-Wl,/implib:lib\\' + implib]
 			else
-				lk_args = ['-Wl,--version-script=' + version_map]
+				if is_windows
+					lk_args = ['-Wl,--version-script=' + mingw_map.full_path()]
+				else
+					lk_args = ['-Wl,--version-script=' + version_map]
+				endif
 			endif
 
-			lk_deps = [version_map, def_file]
+			lk_deps = [version_map, def_file, mingw_map]
 			if not is_windows
 				# on unix systems check the output of the
 				# check-symbols.sh script, using it as a
-- 
2.16.1.windows.4