cmake: remove HPX_WITH_CXX20_SOURCE_LOCATION feature test

cmake/HPX_AddConfigTest.cmake

@@ -498,15 +498,6 @@ function(hpx_check_for_cxx20_lambda_capture)
   )
 endfunction()
 
-# ##############################################################################
-function(hpx_check_for_cxx20_source_location)
-  add_hpx_config_test(
-    HPX_WITH_CXX20_SOURCE_LOCATION
-    SOURCE cmake/tests/cxx20_source_location.cpp
-    FILE ${ARGN}
-  )
-endfunction()
-
 # ##############################################################################
 function(hpx_check_for_pthread_setname_np)
   add_hpx_config_test(

cmake/HPX_PerformCxxFeatureTests.cmake

@@ -98,10 +98,6 @@ function(hpx_perform_cxx_feature_tests)
       DEFINITIONS HPX_HAVE_CXX20_LAMBDA_CAPTURE
     )
 
-    hpx_check_for_cxx20_source_location(
-      DEFINITIONS HPX_HAVE_CXX20_SOURCE_LOCATION
-    )
-
     if(HPX_WITH_SUPPORT_NO_UNIQUE_ADDRESS_ATTRIBUTE AND NOT MSVC) # see above
       hpx_check_for_cxx20_no_unique_address_attribute(
         DEFINITIONS HPX_HAVE_CXX20_NO_UNIQUE_ADDRESS_ATTRIBUTE

cmake/templates/std_headers.hpp.in

@@ -45,9 +45,7 @@
 #endif
 
 #include <bit>
-#if defined(HPX_HAVE_CXX20_SOURCE_LOCATION)
-# include <source_location>
-#endif
+#include <source_location>
 
 #if defined(HPX_HAVE_CXX23_STD_GENERATOR)
 # include <generator>

libs/core/assertion/include/hpx/assertion/macros.hpp

@@ -99,13 +99,5 @@
         "on the issue tracker: https://github.com/STEllAR-GROUP/hpx/issues."); \
     std::terminate()
 
-#if defined(HPX_HAVE_CXX20_SOURCE_LOCATION)
 #define HPX_CURRENT_SOURCE_LOCATION() std::source_location::current()
-#else
-#define HPX_CURRENT_SOURCE_LOCATION()                                          \
-    ::hpx::source_location                                                     \
-    {                                                                          \
-        __FILE__, static_cast<std::uint_least32_t>(__LINE__), __func__         \
-    }
-#endif
 #endif

libs/core/assertion/include/hpx/assertion/source_location.hpp

@@ -13,70 +13,14 @@
 
 #include <hpx/config/export_definitions.hpp>
 
-#include <cstdint>
 #include <iosfwd>
-
-#if defined(HPX_HAVE_CXX20_SOURCE_LOCATION)
 #include <source_location>
-#endif
 
 namespace hpx {
 
     /// This contains the location information where \a HPX_ASSERT has been
     /// called
-#if defined(HPX_HAVE_CXX20_SOURCE_LOCATION)
     HPX_CXX_CORE_EXPORT using std::source_location;
-#else
-    /// The \a source_location class represents certain information about the
-    /// source code, such as file names, line numbers, and function names.
-    /// Previously, functions that desire to obtain this information about
-    /// the call site (for logging, testing, or debugging purposes) must
-    /// use macros so that predefined macros like \a __LINE__ and \a __FILE__
-    /// are expanded in the context of the caller. The \a source_location class
-    /// provides a better alternative.
-    /// \a source_location meets the \a DefaultConstructible, \a CopyConstructible,
-    /// \a CopyAssignable and \a Destructible requirements. Lvalue of \a
-    /// source_location meets the Swappable requirement. Additionally, the following
-    /// conditions are true:
-    /// - \code std::is_nothrow_move_constructible_v<std::source_location> \endcode
-    /// - \code std::is_nothrow_move_assignable_v<std::source_location> \endcode
-    /// - \code std::is_nothrow_swappable_v<std::source_location> \endcode
-    /// It is intended that source_location has a small size and can be copied
-    /// efficiently.
-    /// It is unspecified whether the copy/move constructors and the copy/move
-    /// assignment operators of \a source_location are trivial and/or constexpr.
-    HPX_CXX_CORE_EXPORT struct source_location
-    {
-        char const* filename;
-        std::uint_least32_t line_number;
-        char const* functionname;
-
-        // compatibility with C++20 std::source_location
-        /// return the line number represented by this object
-        [[nodiscard]] constexpr std::uint_least32_t line() const noexcept
-        {
-            return line_number;
-        }
-
-        /// return the column number represented by this object
-        [[nodiscard]] static constexpr std::uint_least32_t column() noexcept
-        {
-            return 0;
-        }
-
-        /// return the file name represented by this object
-        [[nodiscard]] constexpr char const* file_name() const noexcept
-        {
-            return filename;
-        }
-
-        /// return the name of the function represented by this object, if any
-        [[nodiscard]] constexpr char const* function_name() const noexcept
-        {
-            return functionname;
-        }
-    };
-#endif
 
     HPX_CXX_CORE_EXPORT HPX_CORE_EXPORT std::ostream& operator<<(
         std::ostream& os, source_location const& loc);