[MYNEWT-323] Newt - Build options precedence hierarchy

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: v1_0_0_beta1
• Component/s: Newt
• Security Level: Public (Viewable by anyone)
• Assignee: Christopher Collins
• Reporter: Christopher Collins
• Created: 18/Jun/16 16:32
• Updated: 23/Nov/16 21:38
• Resolved: 09/Jul/16 23:35

Description

When two packages specify conflicting build options, it is undefined which one takes effect. Worse, if two packages specify conflicting cflags (e.g., "-DLOG_LEVEL=0" and "-DLOG_LEVEL=1"), gcc reports an error and aborts the build.

We should enforce a well-defined precedence hierarchy. I'm thinking something like this (lowest priority first):

• Library
• BSP
• App
• Target

In the case of conflicting options, newt should discard all but the highest priority. Newt would need to do some simple parsing of cflags to identity conflicts.

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