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Erreur de nom de type inconnu 'constexpr' lors de la création sous Mac OS X

quand je fais un programme en utilisant scons, il se produit une erreur comme,

erreur: nom de type inconnu 'constexpr'

erreur: unqualified-id attendu

Je suis déjà installé xcode et xquartz dernière version. c'est ma version mac clang

Apple LLVM version 8.1.0 (clang-802.0.42) Cible: x86_64-Apple-darwin16.6.0 Modèle de thread: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Et, j'ai joint tout mon journal d'erreurs au cas où.

/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:54:10: error: unknown type name 'constexpr'
static constexpr double     pi  = 3.1415;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:54:20: error: expected unqualified-id
static constexpr double     pi  = 3.1415;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:55:10: error: unknown type name 'constexpr'
static constexpr double  twopi  = 2*pi;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:55:20: error: expected unqualified-id
static constexpr double  twopi  = 2*pi;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:56:10: error: unknown type name 'constexpr'
static constexpr double halfpi  = pi/2;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:56:20: error: expected unqualified-id
static constexpr double halfpi  = pi/2;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:57:10: error: unknown type name 'constexpr'
static constexpr double     pi2 = pi*pi;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:57:20: error: expected unqualified-id
static constexpr double     pi2 = pi*pi;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:62:10: error: unknown type name 'constexpr'
static constexpr double millimeter  = 1.;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:62:20: error: expected unqualified-id
static constexpr double millimeter  = 1.;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:63:10: error: unknown type name 'constexpr'
static constexpr double millimeter2 = millimeter*millimeter;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:63:20: error: expected unqualified-id
static constexpr double millimeter2 = millimeter*millimeter;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:64:10: error: unknown type name 'constexpr'
static constexpr double millimeter3 = millimeter*millimeter*millimeter;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:64:20: error: expected unqualified-id
static constexpr double millimeter3 = millimeter*millimeter*millimeter;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:66:10: error: unknown type name 'constexpr'
static constexpr double centimeter  = 10.*millimeter;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:66:20: error: expected unqualified-id
static constexpr double centimeter  = 10.*millimeter;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:67:10: error: unknown type name 'constexpr'
static constexpr double centimeter2 = centimeter*centimeter;
       ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:67:20: error: expected unqualified-id
static constexpr double centimeter2 = centimeter*centimeter;
                 ^
/Users/jeon.hk/Documents/geant4/geant4.10.3-install/bin/../include/Geant4/CLHEP/Units/SystemOfUnits.h:68:10: error: unknown type name 'constexpr'
static constexpr double centimeter3 = centimeter*centimeter*centimeter;
       ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
scons: *** [build/macosx64/rat.o] Error 1 
scons: building terminated because of errors.

Je vous remercie vraiment pour tout commentaire.

c++c++11constexpr
13
orde.r

La bonne réponse à ce problème est de compiler avec le support c ++ 11 activé (pour clang -std=c++11) afin de faire reconnaître le mot clé constexpr.

8
sandwood