Add config.{c,cxx}.std

These values override {c,cxx}.std specified at the project level. In
particular, this allows us to force a specific standard for all the
projects in a build configuration, for example:

b create: conf/,cc config.cxx=g++ config.cxx.std=experimental

1 files changed, 2 insertions, 2 deletions

diff --git a/build2/cc/common.hxx b/build2/cc/common.hxx
index dec71ed..19733cf 100644
--- a/build2/cc/common.hxx
+++ b/build2/cc/common.hxx
@@ -43,6 +43,7 @@ namespace build2
       const variable& config_x_id;      // <type>[-<variant>]
       const variable& config_x_version;
       const variable& config_x_target;
+      const variable& config_x_std;
       const variable& config_x_poptions;
       const variable& config_x_coptions;
       const variable& config_x_loptions;
@@ -53,6 +54,7 @@ namespace build2
       const variable& x_sys_lib_dirs; // System library search directories.
       const variable& x_sys_inc_dirs; // System header search directories.
 
+      const variable& x_std;
       const variable& x_poptions;
       const variable& x_coptions;
       const variable& x_loptions;
@@ -87,8 +89,6 @@ namespace build2
       const variable& x_preprocessed; // x.preprocessed
       const variable* x_symexport;    // x.features.symexport
 
-      const variable& x_std;
-
       const variable& x_id;
       const variable& x_id_type;
       const variable& x_id_variant;