From 17a0703d205d26048247e22174a1eda36498d341 Mon Sep 17 00:00:00 2001
From: Martin Koegler <martin.koegler@chello.at>
Date: Tue, 10 Jan 2017 23:28:47 +0100
Subject: GetPrerequisites: Do not fail on files we cannot find

Historically we have always warned and skipped missing files.  Since
commit v3.4.0-rc1~264^2~1 (GetPrerequisites: Add error checks for
execute_process() calls, 2015-07-29) we fail instead, but this was not
an intentional part of that change.  Restore the warn-only behavior so
that missing system libraries (e.g. during cross-compiling) do not cause
failure.

Closes: #16523
---
 Modules/GetPrerequisites.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Modules/GetPrerequisites.cmake b/Modules/GetPrerequisites.cmake
index 72775ce..d6a78de 100644
--- a/Modules/GetPrerequisites.cmake
+++ b/Modules/GetPrerequisites.cmake
@@ -654,6 +654,8 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
 
   if(NOT EXISTS "${target}")
     message("warning: target '${target}' does not exist...")
+    set(${prerequisites_var} "" PARENT_SCOPE)
+    return()
   endif()
 
   set(gp_cmd_paths ${gp_cmd_paths}
-- 
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