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[PATCH cygport 2/3] Add src_patch_apply_hook


---
 lib/check_funcs.cygpart |  1 +
 lib/src_prep.cygpart    | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/lib/check_funcs.cygpart b/lib/check_funcs.cygpart
index 961f263..224a7b1 100644
--- a/lib/check_funcs.cygpart
+++ b/lib/check_funcs.cygpart
@@ -687,6 +687,7 @@ __check_unstable() {
 	else
 		warning "The ${1} API is not yet stable and is subject to change"
 		warning "You must define ${unstable_var} in order to use it"
+		return  0
 	fi
 }
 
diff --git a/lib/src_prep.cygpart b/lib/src_prep.cygpart
index 2277ba4..db4a5cf 100644
--- a/lib/src_prep.cygpart
+++ b/lib/src_prep.cygpart
@@ -210,6 +210,24 @@ cygpatch() {
 			continue;
 		fi
 
+#****v* Preparation/src_patch_apply_hook
+#  DESCRIPTION
+#  src_patch_apply_hook() is an optional function which can be defined
+#  to control patch application, for architecture dependent patches, etc.
+#  It receives a patch filename as an argument, and a non-zero result
+#  causes the patch to be skipped.
+#  (This API is not yet stable and is subject to change)
+#****
+
+		if __check_function src_patch_apply_hook
+		then
+			if ! __check_unstable src_patch_apply_hook ${patchfile_name}
+			then
+				warning "patch ${patchfile_name} skipped by src_patch_apply_hook";
+				continue;
+			fi
+		fi
+
 		patchlevel=0;
 
 		case ${patchfile_name} in
-- 
2.16.1


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