abseil: ensure clients must use C++17

mingw-w64-abseil-cpp/0004-abseil-Propagate-cxx-std-17.patch

@@ -0,0 +1,67 @@
+--- abseil-cpp-20211102.0/CMake/AbseilHelpers.cmake.orig	2021-11-03 16:26:14.000000000 +0100
++++ abseil-cpp-20211102.0/CMake/AbseilHelpers.cmake	2022-06-01 16:55:00.896155100 +0200
+@@ -258,7 +258,7 @@
+       # Abseil libraries require C++11 as the current minimum standard.
+       # Top-level application CMake projects should ensure a consistent C++
+       # standard for all compiled sources by setting CMAKE_CXX_STANDARD.
+-      target_compile_features(${_NAME} PUBLIC cxx_std_11)
++      target_compile_features(${_NAME} PUBLIC cxx_std_17)
+     else()
+       # Note: This is legacy (before CMake 3.8) behavior. Setting the
+       # target-level CXX_STANDARD property to ABSL_CXX_STANDARD (which is
+@@ -306,7 +306,7 @@
+       # Abseil libraries require C++11 as the current minimum standard.
+       # Top-level application CMake projects should ensure a consistent C++
+       # standard for all compiled sources by setting CMAKE_CXX_STANDARD.
+-      target_compile_features(${_NAME} INTERFACE cxx_std_11)
++      target_compile_features(${_NAME} INTERFACE cxx_std_17)
+ 
+       # (INTERFACE libraries can't have the CXX_STANDARD property set, so there
+       # is no legacy behavior else case).
+@@ -418,7 +418,7 @@
+     # Abseil libraries require C++11 as the current minimum standard.
+     # Top-level application CMake projects should ensure a consistent C++
+     # standard for all compiled sources by setting CMAKE_CXX_STANDARD.
+-    target_compile_features(${_NAME} PUBLIC cxx_std_11)
++    target_compile_features(${_NAME} PUBLIC cxx_std_17)
+   else()
+     # Note: This is legacy (before CMake 3.8) behavior. Setting the
+     # target-level CXX_STANDARD property to ABSL_CXX_STANDARD (which is
+--- abseil-cpp-20211102.0/absl/base/options.h.orig	2021-11-03 16:26:14.000000000 +0100
++++ abseil-cpp-20211102.0/absl/base/options.h	2022-06-01 17:01:28.159314200 +0200
+@@ -100,7 +100,7 @@
+ // User code should not inspect this macro.  To check in the preprocessor if
+ // absl::any is a typedef of std::any, use the feature macro ABSL_USES_STD_ANY.
+ 
+-#define ABSL_OPTION_USE_STD_ANY 2
++#define ABSL_OPTION_USE_STD_ANY 1
+ 
+ 
+ // ABSL_OPTION_USE_STD_OPTIONAL
+@@ -127,7 +127,7 @@
+ // absl::optional is a typedef of std::optional, use the feature macro
+ // ABSL_USES_STD_OPTIONAL.
+ 
+-#define ABSL_OPTION_USE_STD_OPTIONAL 2
++#define ABSL_OPTION_USE_STD_OPTIONAL 1
+ 
+ 
+ // ABSL_OPTION_USE_STD_STRING_VIEW
+@@ -154,7 +154,7 @@
+ // absl::string_view is a typedef of std::string_view, use the feature macro
+ // ABSL_USES_STD_STRING_VIEW.
+ 
+-#define ABSL_OPTION_USE_STD_STRING_VIEW 2
++#define ABSL_OPTION_USE_STD_STRING_VIEW 1
+ 
+ // ABSL_OPTION_USE_STD_VARIANT
+ //
+@@ -180,7 +180,7 @@
+ // absl::variant is a typedef of std::variant, use the feature macro
+ // ABSL_USES_STD_VARIANT.
+ 
+-#define ABSL_OPTION_USE_STD_VARIANT 2
++#define ABSL_OPTION_USE_STD_VARIANT 1
+ 
+ 
+ // ABSL_OPTION_USE_INLINE_NAMESPACE

mingw-w64-abseil-cpp/PKGBUILD

@@ -17,11 +17,13 @@ makedepends=("${MINGW_PACKAGE_PREFIX}-cmake"
 source=("https://github.com/abseil/abseil-cpp/archive/$pkgver/$_realname-$pkgver.tar.gz"
         "0001-abseil-Fix-compiler-warnings.patch"
         "0002-abseil-Remove-librt-library.patch"
-        "0003-abseil-Include-pthread-header.patch")
+        "0003-abseil-Include-pthread-header.patch"
+        "0004-abseil-Propagate-cxx-std-17.patch")
 sha256sums=('dcf71b9cba8dc0ca9940c4b316a0c796be8fab42b070bb6b7cab62b48f0e66c4'
             'd273d7fa05f912edc8d91c0c8ba6f1f0576d0d98714bc4bd9b624e148f7aad19'
             'd3ecabcebf64c2211b40e07f376de028ad1b101051cba7e69d77f6074217238d'
-            '66bf9f2919aed3a4f71bba6b6809078dd6cb22faef763e63c3f813d3f54782c9')
+            '66bf9f2919aed3a4f71bba6b6809078dd6cb22faef763e63c3f813d3f54782c9'
+            '52cbf35dace3296dbe0f72acc2235cf009c0fffce8cf0fb455a99a71e5f25ab2')
 
 prepare() {
   cd "${_realname}-${pkgver}"
@@ -29,6 +31,7 @@ prepare() {
   patch -Np1 -i "${srcdir}/0001-abseil-Fix-compiler-warnings.patch"
   patch -Np1 -i "${srcdir}/0002-abseil-Remove-librt-library.patch"
   patch -Np1 -i "${srcdir}/0003-abseil-Include-pthread-header.patch"
+  patch -Np1 -i "${srcdir}/0004-abseil-Propagate-cxx-std-17.patch"
 }
 
 build() {