How to display compiler output or custom build steps output when building with xcode?

Question

How can I see the output from the compiler of from the custom build steps (pre-action or post-action)?

Answer 1

You'll find (and you can watch during the build) the complete build output in the Log Navigator. That's the right most icon of the small icons just below the Run and Build buttons.

Answer 2

Pre-action output at least appears in system.log and is visible in Console.app.

Answer 3

EDIT: as pointed out in the comment below this answer only works for Build phase scripts, not pre action and post action scripts.

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In Xcode 8 you need need to select your latest build in "Navigator -> Report Navigator". In the main area you will be able to see the complete build log including your output.

Here is a simple "Hello world" echo

Answer 4

Per my answer here ( Is it normal for Xcode not to detect if a pre-action failed? ) this is an issue that's been discussed in the dev forums. Pre-/post-action script non-zero status doesn't seem to have an affect, nor does the output seem to make it into any logs.