fix abseil setup on windows

recipe/meta.yaml

@@ -18,6 +18,8 @@ source:
     - patches/0004-also-install-pkg-config-files-on-windows.patch
     # install CMake metadata
     - patches/0005-create-and-install-CMake-metadata.patch
+    # fix abseil setup on windows
+    - patches/0006-also-link-to-static-absl_flags_-on-windows.patch
 
 build:
   number: 0

recipe/patches/0001-do-not-mix-static-shared-builds.patch

@@ -1,7 +1,7 @@
 From 2fe3e37744c810590e631c01fb57133080fc5f46 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Thu, 2 Dec 2021 08:39:53 +1100
-Subject: [PATCH 1/5] do not mix static & shared builds
+Subject: [PATCH 1/6] do not mix static & shared builds
 
 ---
  src/CMakeLists.txt | 20 ++++++++++----------

recipe/patches/0002-do-not-build-vendored-abseil-libprotobuf-lite.patch

@@ -1,7 +1,7 @@
 From ab5c20be4a987d1cd6d2e472634f5e1b9c11211f Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Thu, 2 Dec 2021 10:05:12 +1100
-Subject: [PATCH 2/5] do not build vendored abseil & libprotobuf-lite
+Subject: [PATCH 2/6] do not build vendored abseil & libprotobuf-lite
 
 ensure we can use shared builds of libprotobuf also on windows
 ---

recipe/patches/0003-point-to-our-libs-headers-for-windows-in-setup.py.patch

@@ -1,7 +1,7 @@
 From 428ac3758e24b1aeedec8e0568d128e2097d1646 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Sun, 11 Dec 2022 01:09:03 +1100
-Subject: [PATCH 3/5] point to our libs / headers for windows in setup.py
+Subject: [PATCH 3/6] point to our libs / headers for windows in setup.py
 
 also do not risk building against bundled libs, nor
 setting /MT for the MSVC static runtime libs

recipe/patches/0004-also-install-pkg-config-files-on-windows.patch

@@ -1,7 +1,7 @@
 From f6ec12fe46a666940007cb205e715ee6f3916e97 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Mon, 12 Dec 2022 14:36:45 +1100
-Subject: [PATCH 4/5] also install pkg-config files on windows
+Subject: [PATCH 4/6] also install pkg-config files on windows
 
 ---
  CMakeLists.txt | 4 +---

recipe/patches/0005-create-and-install-CMake-metadata.patch

@@ -1,7 +1,7 @@
 From 366a1080b048a43452bdfb43968c5f2a44acdcf4 Mon Sep 17 00:00:00 2001
 From: "H. Vetinari" <[email protected]>
 Date: Wed, 18 Jan 2023 19:44:15 +1100
-Subject: [PATCH 5/5] create and install CMake metadata
+Subject: [PATCH 5/6] create and install CMake metadata
 
 ---
  CMakeLists.txt               | 10 ++++++++++

recipe/patches/0006-also-link-to-static-absl_flags_-on-windows.patch

@@ -0,0 +1,36 @@
+From 64f7608bd0757387cee221df7014c9bdbe78585b Mon Sep 17 00:00:00 2001
+From: "H. Vetinari" <[email protected]>
+Date: Tue, 20 Feb 2024 17:43:23 +1100
+Subject: [PATCH 6/6] also link to static absl_flags_* on windows
+
+---
+ python/setup.py | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/python/setup.py b/python/setup.py
+index fb301ac..4366d1a 100755
+--- a/python/setup.py
++++ b/python/setup.py
+@@ -117,13 +117,21 @@ if os.name == 'nt':
+     ]
+   elif True:
+     cflags = ['/std:c++17', '/MD', '/I' + os.environ["LIBRARY_INC"]]
++    # most of abseil can be built as shared, which ends up in one giant library
++    # called abseil_dll; the absl_flags_* libraries always stay static
++    absl_libs = [
++        "abseil_dll", "absl_flags", "absl_flags_commandlineflag", "absl_flags_commandlineflag_internal",
++        "absl_flags_config", "absl_flags_internal", "absl_flags_marshalling", "absl_flags_parse",
++        "absl_flags_private_handle_accessor", "absl_flags_program_name", "absl_flags_reflection",
++        "absl_flags_usage", "absl_flags_usage_internal",
++    ]
+     libs = [
+       # equivalent of -L$PREFIX/lib -lsentencepiece -lsentencepiece_train -lprotobuf-lite
+       os.environ["LIBRARY_LIB"] + f"\\{x}.lib"
+       # protobuf actually has the lib-prefix in the name also on windows;
+       # since libsentencepiece is static on windows, we also need _its_
+       # host dependencies for the link interface, i.e. also abseil
+-      for x in ["sentencepiece", "sentencepiece_train", "libprotobuf-lite", "abseil_dll"]
++      for x in ["sentencepiece", "sentencepiece_train", "libprotobuf-lite"] + absl_libs
+     ]
+   else:
+     # build library locally with cmake and vc++.