From 3cc5e3bd441fc9d18fece3d9e99fae75c78438e7 Mon Sep 17 00:00:00 2001 From: Boris Kolpackov Date: Thu, 28 Jun 2018 09:44:15 +0200 Subject: Implement support for excluded and ad hoc prerequisites The inclusion/exclusion is controlled via the 'include' prerequisite-specific variable. Valid values are: false - exclude true - include adhoc - include but treat as an ad hoc input For example: lib{foo}: cxx{win32-utility}: include = ($cxx.targe.class == 'windows') exe{bar}: libs{plugin}: include = adhoc --- build2/variable.hxx | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'build2/variable.hxx') diff --git a/build2/variable.hxx b/build2/variable.hxx index 808efc9..4d11b25 100644 --- a/build2/variable.hxx +++ b/build2/variable.hxx @@ -330,6 +330,13 @@ namespace build2 template const T& cast_empty (const value&); template const T& cast_empty (const lookup&); + // As above but returns the specified default if the value is NULL (or not + // defined, in case of lookup). Note that the return is by value, not by + // reference. + // + template T cast_default (const value&, const T&); + template T cast_default (const lookup&, const T&); + // As above but returns false/true if the value is NULL (or not defined, // in case of lookup). Note that the template argument is only for // documentation and should be bool (or semantically compatible). -- cgit v1.1