build: check for Swift version and disable dependencies if needed

(cherry picked from commit 50787acb275dc0465a0cf7234ee8f9bd07f0d4d1)

1 files changed, 8 insertions, 1 deletions

diff --git a/waftools/checks/custom.py b/waftools/checks/custom.py
index 06a7c70769..1cb133f27c 100644
--- a/waftools/checks/custom.py
+++ b/waftools/checks/custom.py
@@ -4,7 +4,7 @@ from waflib import Utils
 import os
 
 __all__ = ["check_pthreads", "check_iconv", "check_lua",
-           "check_cocoa", "check_wl_protocols"]
+           "check_cocoa", "check_wl_protocols", "check_swift"]
 
 pthreads_program = load_fragment('pthreads.c')
 
@@ -111,3 +111,10 @@ def check_cocoa(ctx, dependency_identifier):
         ])
 
     return res
+
+def check_swift(ctx, dependency_identifier):
+    if ctx.env.SWIFT_VERSION:
+        major = int(ctx.env.SWIFT_VERSION.split('.')[0])
+        if major >= 3:
+            return True
+    return False