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-rw-r--r--tests/cxx/tree/union/ctor/makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/cxx/tree/union/ctor/makefile b/tests/cxx/tree/union/ctor/makefile
index 53b1055..3c08eaa 100644
--- a/tests/cxx/tree/union/ctor/makefile
+++ b/tests/cxx/tree/union/ctor/makefile
@@ -34,7 +34,7 @@ genf := $(xsd:.xsd=.hxx) $(xsd:.xsd=.ixx) $(xsd:.xsd=.cxx)
gen := $(addprefix $(out_base)/,$(genf))
$(gen): xsd := $(out_root)/xsd/xsd
-$(gen): xsd_options := --generate-default-ctor --generate-from-base-ctor \
+$(gen): xsd_options += --generate-default-ctor --generate-from-base-ctor \
--generate-doxygen
$(gen): $(out_root)/xsd/xsd