From 1813bb59174a8f6e60a4f7aff2ac9af81a8810f5 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Mon, 25 Oct 2021 18:37:21 +0200
Subject: [PATCH] vulkan: Fix entrypoint generation when compiling for x86 with
 MSVC

When compiling for x86 with MSVC, Vulkan API entry points follow the
__stdcall convention (VKAPI_CALL maps to __stdcall), which uses the
following name mangling:

   _<function_name>@<arguments_size>

Fix the vk_entrypoint_stub()/alternatename definitions accordingly.

Fixes: 6d44b21d4fd ("vulkan: Fix weak symbol emulation when compiling with MSVC")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13516>
---
 src/vulkan/util/vk_dispatch_table_gen.py | 4 ++--
 src/vulkan/util/vk_entrypoints_gen.py    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/vulkan/util/vk_dispatch_table_gen.py b/src/vulkan/util/vk_dispatch_table_gen.py
index d07d5120d1e..eb6b0cd28e2 100644
--- a/src/vulkan/util/vk_dispatch_table_gen.py
+++ b/src/vulkan/util/vk_dispatch_table_gen.py
@@ -69,7 +69,7 @@ extern "C" {
 #endif
 
 #ifdef _MSC_VER
-void vk_entrypoint_stub(void);
+VKAPI_ATTR void VKAPI_CALL vk_entrypoint_stub(void);
 #endif
 
 <%def name="dispatch_table(entrypoints)">
@@ -469,7 +469,7 @@ vk_device_entrypoint_is_enabled(int index, uint32_t core_version,
 }
 
 #ifdef _MSC_VER
-void vk_entrypoint_stub(void)
+VKAPI_ATTR void VKAPI_CALL vk_entrypoint_stub(void)
 {
    unreachable(!"Entrypoint not implemented");
 }
diff --git a/src/vulkan/util/vk_entrypoints_gen.py b/src/vulkan/util/vk_entrypoints_gen.py
index 2c234911b24..078b6daec0b 100644
--- a/src/vulkan/util/vk_entrypoints_gen.py
+++ b/src/vulkan/util/vk_entrypoints_gen.py
@@ -125,7 +125,7 @@ TEMPLATE_C = Template(COPYRIGHT + """
 #ifdef _MSC_VER
 #ifdef _M_IX86
       % for args_size in [4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 60, 104]:
-    #pragma comment(linker, "/alternatename:_${p}_${e.name}@${args_size}=_vk_entrypoint_stub")
+    #pragma comment(linker, "/alternatename:_${p}_${e.name}@${args_size}=_vk_entrypoint_stub@0")
       % endfor
 #else
     #pragma comment(linker, "/alternatename:${p}_${e.name}=vk_entrypoint_stub")