add new ADK Symbol PKG_NEEDS

There are a lot of packages which needs special features either
toolchain or hardware features. Add a new symbol which will be
used to disable packages, when a toolchain for example does
not provide this feature.

At the moment following features are required to set for a
package: threads rt c++.

There will follow: mmu iconv.

This will help to better support targets without MMU or
threading support.

1 files changed, 5 insertions, 1 deletions

diff --git a/docs/package-reference.txt b/docs/package-reference.txt
index 926cc6b8c..c06741198 100644
--- a/docs/package-reference.txt
+++ b/docs/package-reference.txt
@@ -44,10 +44,14 @@ information is:
   installed before the configuration of the current package starts.
 
 * +PKG_DEPENDS+ optional, lists the runtime dependencies that are required to
-  run the software package on the target. It conatins a list of package names,
+  run the software package on the target. It contains a list of package names,
   which might be different to the package directory name. See what is used
   in PKG_template, to find out the package name used here.
 
+* +PKG_NEEDS+ optional, lists the features that are required to build or
+  run the software package on the target. It contains a list of keywords.
+  Supported are +threads+ +rt+ +c+++
+
 * +PKG_NOPARALLEL+ optional, may be set to 1, to disable parallel building of the
   package via make -jn, n=4 is default, but can be changed in +Global Settings+ in the
   menu based configuration.