config_host/config_global.h.in

   1 /*
   2 Global configuration file.
   3
   4 Only for settings that apply to every source file and are unlikely to change often,
   5 such as whether a certain C++11 feature is available.
   6
   7 Do NOT use for settings local to some code or for settings that can change often.
   8 Any change in this header will cause a rebuild of almost everything.
   9
  10 */
  11
  12 #ifndef CONFIG_GLOBAL_H
  13 #define CONFIG_GLOBAL_H
  14
  15 #define HAVE_GCC_BUILTIN_ATOMIC 0
  16 #define HAVE_SYSLOG_H 0
  17
  18 // Compiler supports C++20 <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1073r3.html>
  19 // "Immediate functions":
  20 #define HAVE_CPP_CONSTEVAL 0
  21
  22 // Compiler supports all of C++2a <https://wg21.link/P0202R3> "Add Constexpr Modifiers to Functions
  23 // in <algorithm> and <utility> Headers", <https://wg21.link/P1004R2> "Making std::vector
  24 // constexpr", and <https://wg21.link/P1143R2> "Adding the constinit keyword":
  25 #define HAVE_CPP_CONSTINIT_SORTED_VECTOR 0
  26
  27 // Useable C++2a <span>:
  28 #define HAVE_CPP_SPAN 0
  29
  30 /* "CWG motion 23: P1825R0 'Merged wording for P0527R1 and P1155R3' (DR)" in
  31    <https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/n4829.html> "N4829 Editors' Report --
  32    Programming Languages -- C++" marks
  33    <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1155r3.html> "More implicit moves" as a
  34    DR.  Some versions of GCC already implemented it prior to the fix for
  35    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87150> "move ctor wrongly chosen in return stmt
  36    (derived vs. base)"; MSVC++ 14.24 started to implement it, see <https://
  37    developercommunity.visualstudio.com/content/problem/852827/
  38    msvc-1424-started-to-chose-move-ctor-in-return-der.html> "MSVC++ 14.24 started to chose move ctor
  39    in return derived vs. base".  At least Clang 9, which does not implement it, emits
  40    -Werror,-Wreturn-std-move when it therefore considers a std::move to be missing.  On the other
  41    hand, at least some versions of GCC would emit -Werror=redundant-move in places where such a
  42    std::move would be added unconditionally, see c00948d9bd35dfb15a331c2163f32e9ee24644fd "Silence
  43    bogus -Werror=redundant-move (GCC 9)". */
  44 #define HAVE_P1155R3 0
  45
  46 #endif