Add support for hex notation for uint64 type

Specifically, now we can do:

x = [uint64] 0x0000ffff

cxx.poptions += "-DOFFSET=$x"                 # -DOFFSET=65535
cxx.poptions += "-DOFFSET=$string($x, 16)"    # -DOFFSET=0xffff
cxx.poptions += "-DOFFSET=$string($x, 16, 8)" # -DOFFSET=0x0000ffff

Note that there is no hex notation support for the int64 (signed) type.

1 files changed, 1 insertions, 0 deletions

diff --git a/libbuild2/utility.hxx b/libbuild2/utility.hxx
index c82dcc2..a285b03 100644
--- a/libbuild2/utility.hxx
+++ b/libbuild2/utility.hxx
@@ -69,6 +69,7 @@ namespace build2
   using butl::alpha;
   using butl::alnum;
   using butl::digit;
+  using butl::wspace;
 
   using butl::trim;
   using butl::next_word;