Backport a patch to allow clang to compile this release.

special thanks to @1480c1 for creating the patch for upstream

mingw-w64-aom/PKGBUILD

@@ -4,7 +4,7 @@ _realname=aom
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=3.1.1
-pkgrel=1
+pkgrel=2
 pkgdesc='AV1 codec library (mingw-w64)'
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64')
@@ -20,10 +20,12 @@ makedepends=("perl"
              "${MINGW_PACKAGE_PREFIX}-ninja"
              "${MINGW_PACKAGE_PREFIX}-python")
 source=("https://storage.googleapis.com/aom-releases/libaom-${pkgver}.tar.gz"{,.asc}
-        "fix-lib-dest.patch")
+        "fix-lib-dest.patch"
+        "f19edfa.diff")
 sha256sums=('7cd5e8e469268c37241df93fe61557ea0dc46980ca21b37e786e92a3d0729276'
             'SKIP'
-            '3a202005676f91b2b5ee5d7c10792f1930b204f36a96d7d5b893ef81d375b19d')
+            '3a202005676f91b2b5ee5d7c10792f1930b204f36a96d7d5b893ef81d375b19d'
+            '7dc44a08cb6c70f6a2fcd7c1310ac96da386186a27413b8c145644d3fa5b8054')
 validpgpkeys=('B002F08B74A148DAA01F7123A48E86DB0B830498')
 noextract=("libaom-${pkgver}.tar.gz")
 
@@ -34,6 +36,7 @@ prepare() {
   cd "${srcdir}/${_realname}"
 
   patch -Np1 -i "${srcdir}"/fix-lib-dest.patch
+  patch -Np1 -i "${srcdir}"/f19edfa.diff
 }
 
 build() {

mingw-w64-aom/f19edfa.diff

@@ -0,0 +1,89 @@
+From f19edfa95f8dc9fa596282a210757e4d6d0cd490 Mon Sep 17 00:00:00 2001
+From: Christopher Degawa <christopher.degawa@intel.com>
+Date: Thu, 03 Jun 2021 18:05:47 -0500
+Subject: [PATCH] exports.cmake: use APPLE and WIN32 and use def for mingw-w64
+
+mingw-w64's ld and lld automatically accepts MSVC's def files and CMake
+can handle the proper flags for .def files added to a library's sources.
+
+This fixes the export file handling for mingw-w64 lld as that lld does
+not support the --version-script argument
+
+Signed-off-by: Christopher Degawa <christopher.degawa@intel.com>
+Change-Id: I18a1ce2696e2f9b083ecab3d0d60566d48b68cf0
+---
+
+diff --git a/build/cmake/exports.cmake b/build/cmake/exports.cmake
+index fa7842c..4f9d043 100644
+--- a/build/cmake/exports.cmake
++++ b/build/cmake/exports.cmake
+@@ -17,9 +17,9 @@
+ 
+ # Creates the custom target which handles generation of the symbol export lists.
+ function(setup_exports_target)
+-  if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
++  if(APPLE)
+     set(symbol_file_ext "syms")
+-  elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS" AND MSVC)
++  elseif(WIN32)
+     set(symbol_file_ext "def")
+   else()
+     set(symbol_file_ext "ver")
+@@ -43,7 +43,7 @@
+                             -P
+                             "${AOM_ROOT}/build/cmake/generate_exports.cmake"
+                     SOURCES ${AOM_EXPORTS_SOURCES}
+-                    DEPENDS ${AOM_EXPORTS_SOURCES})
++                    DEPENDS ${AOM_EXPORTS_SOURCES} BYPRODUCTS ${aom_sym_file})
+ 
+   # Make libaom depend on the exports file, and set flags to pick it up when
+   # creating the dylib.
+@@ -54,14 +54,12 @@
+                  APPEND_STRING
+                  PROPERTY LINK_FLAGS "-exported_symbols_list ${aom_sym_file}")
+   elseif(WIN32)
+-    if(NOT MSVC)
+-      set_property(TARGET aom
+-                   APPEND_STRING
+-                   PROPERTY LINK_FLAGS "-Wl,--version-script ${aom_sym_file}")
+-    else()
++    if(MSVC)
+       set_property(TARGET aom
+                    APPEND_STRING
+                    PROPERTY LINK_FLAGS "/DEF:${aom_sym_file}")
++    else()
++      target_sources(aom PRIVATE "${aom_sym_file}")
+     endif()
+ 
+     # TODO(tomfinegan): Sort out the import lib situation and flags for MSVC.
+diff --git a/build/cmake/generate_exports.cmake b/build/cmake/generate_exports.cmake
+index f1d15a0..8720ac8 100644
+--- a/build/cmake/generate_exports.cmake
++++ b/build/cmake/generate_exports.cmake
+@@ -23,7 +23,7 @@
+ 
+ if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
+   set(symbol_prefix "_")
+-elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS" AND AOM_MSVC)
++elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
+   file(WRITE "${AOM_SYM_FILE}" "LIBRARY aom\n" "EXPORTS\n")
+ else()
+   set(symbol_suffix ";")
+@@ -33,7 +33,7 @@
+ 
+ if("${AOM_TARGET_SYSTEM}" STREQUAL "Darwin")
+   file(REMOVE "${aom_sym_file}")
+-elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS" AND AOM_MSVC)
++elseif("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
+   file(WRITE "${aom_sym_file}" "LIBRARY aom\n" "EXPORTS\n")
+ else()
+   file(WRITE "${aom_sym_file}" "{\nglobal:\n")
+@@ -47,7 +47,7 @@
+ 
+ foreach(exported_symbol ${exported_symbols})
+   string(STRIP "${exported_symbol}" exported_symbol)
+-  if("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS" AND AOM_MSVC)
++  if("${AOM_TARGET_SYSTEM}" MATCHES "Windows\|MSYS")
+     string(SUBSTRING ${exported_symbol} 0 4 export_type)
+     string(COMPARE EQUAL "${export_type}" "data" is_data)
+     if(is_data)