[dpdk-stable] patch 'build: fix linker flags on Windows' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/a0e0fe9adf716b5a723fff45ca60cc198d3b2802

Thanks.

Luca Boccassi

---
>From a0e0fe9adf716b5a723fff45ca60cc198d3b2802 Mon Sep 17 00:00:00 2001
From: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
Date: Tue, 12 Jan 2021 03:36:02 +0300
Subject: [PATCH] build: fix linker flags on Windows

[ upstream commit da042bcfc6c870fd067329a22e4084c4b2c4be2a ]

The --export-dynamic linker option is only applicable to ELF.
On Windows, where COFF is used, it causes warnings:

    x86_64-w64-mingw32-ld: warning: --export-dynamic is not supported
    for PE+ targets, did you mean --export-all-symbols? (MinGW)

    LINK : warning LNK4044: unrecognized option '/-export-dynamic';
    ignored (clang)

Don't add --export-dynamic on Windows anywhere.

Fixes: b031e13d7f0d ("build: fix plugin load on static build")

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
Acked-by: Ranjit Menon <ranjit.menon at intel.com>
---
 app/meson.build                   | 2 +-
 buildtools/pkg-config/meson.build | 6 +++++-
 examples/meson.build              | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/app/meson.build b/app/meson.build
index fd72d7da68..903117b866 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -26,7 +26,7 @@ lib_execinfo = cc.find_library('execinfo', required: false)
 
 default_cflags = machine_args + ['-DALLOW_EXPERIMENTAL_API']
 default_ldflags = []
-if get_option('default_library') == 'static'
+if get_option('default_library') == 'static' and not is_windows
 	default_ldflags += ['-Wl,--export-dynamic']
 endif
 
diff --git a/buildtools/pkg-config/meson.build b/buildtools/pkg-config/meson.build
index 168ee08e58..39a8fd1c8e 100644
--- a/buildtools/pkg-config/meson.build
+++ b/buildtools/pkg-config/meson.build
@@ -37,6 +37,10 @@ Use libdpdk.pc instead of this file to query DPDK compile/link arguments''',
 	libraries: ['-Wl,--as-needed'] + dpdk_libraries,
 	libraries_private: dpdk_extra_ldflags)
 
+platform_flags = []
+if not is_windows
+	platform_flags += ['-Wl,--export-dynamic'] # ELF only
+endif
 pkg.generate(name: 'DPDK', # main DPDK pkgconfig file
 	filebase: 'libdpdk',
 	version: meson.project_version(),
@@ -47,7 +51,7 @@ This is required for a number of static inline functions in the public headers.'
 	                  # if libbsd is not enabled, then this is blank
 	libraries_private: ['-Wl,--whole-archive'] +
 			dpdk_drivers + dpdk_static_libraries +
-			['-Wl,--no-whole-archive', '-Wl,--export-dynamic']
+			['-Wl,--no-whole-archive'] + platform_flags
 )
 
 # For static linking with dependencies as shared libraries,
diff --git a/examples/meson.build b/examples/meson.build
index f643ec1bad..b9ab24223f 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -64,7 +64,7 @@ if cc.has_argument('-Wno-format-truncation')
 	default_cflags += '-Wno-format-truncation'
 endif
 default_ldflags = dpdk_extra_ldflags
-if get_option('default_library') == 'static'
+if get_option('default_library') == 'static' and not is_windows
 	default_ldflags += ['-Wl,--export-dynamic']
 endif
 
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:33.457265458 +0000
+++ 0093-build-fix-linker-flags-on-Windows.patch	2021-02-05 11:18:28.946693778 +0000
@@ -1 +1 @@
-From da042bcfc6c870fd067329a22e4084c4b2c4be2a Mon Sep 17 00:00:00 2001
+From a0e0fe9adf716b5a723fff45ca60cc198d3b2802 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit da042bcfc6c870fd067329a22e4084c4b2c4be2a ]
+
@@ -18 +19,0 @@
-Cc: stable at dpdk.org