From f33a7274f310e8d5e21e1f7c3a9ac26580177a11 Mon Sep 17 00:00:00 2001 From: Marko Lindqvist Date: Wed, 20 Mar 2024 15:02:32 +0200 Subject: [PATCH 34/34] Fix C++20 capture this semantics configure check It was failing due to "unused 'this'" even when it should have succeeded. See RM #328 Signed-off-by: Marko Lindqvist --- m4/c++20.m4 | 2 +- meson.build | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/m4/c++20.m4 b/m4/c++20.m4 index 261b0873b8..ac1d2a9a13 100644 --- a/m4/c++20.m4 +++ b/m4/c++20.m4 @@ -11,7 +11,7 @@ AC_DEFUN([FC_CXX20_CAPTURE_THIS], CXXFLAGS="$CXXFLAGS $WERROR_CXX_TEST_FLAGS" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[class me { void top(); }; -void me::top() { [=, this]() {}; }; +void me::top() { (void) [=, this]() { this->top(); }; }; ]])], [ac_cv_cxx20_capture_this=yes], [ac_cv_cxx20_capture_this=no]) CXXFLAGS="$_CXXFLAGS" diff --git a/meson.build b/meson.build index 048abef25b..5d09961b5d 100644 --- a/meson.build +++ b/meson.build @@ -956,7 +956,7 @@ endif if cxx_build and cxx_compiler.compiles(''' class me { void top(); }; -void me::top() { [=, this]() {}; }; +void me::top() { (void) [=, this]() { this->top(); }; }; ''', name: 'C++20 capture this', args: ['-Werror', '-Wall']) -- 2.43.0