silentpayments: add examples/silentpayments.c

Demonstrate sending, scanning, and light client scanning.

.gitignore

@@ -11,6 +11,7 @@ ecdh_example
 ecdsa_example
 schnorr_example
 ellswift_example
+silentpayments_example
 *.exe
 *.so
 *.a

Makefile.am

@@ -195,6 +195,17 @@ ellswift_example_LDFLAGS += -lbcrypt
 endif
 TESTS += ellswift_example
 endif
+if ENABLE_MODULE_SILENTPAYMENTS
+noinst_PROGRAMS += silentpayments_example
+silentpayments_example_SOURCES = examples/silentpayments.c
+silentpayments_example_CPPFLAGS = -I$(top_srcdir)/include -DSECP256K1_STATIC
+silentpayments_example_LDADD = libsecp256k1.la
+silentpayments_example_LDFLAGS = -static
+if BUILD_WINDOWS
+silentpayments_example_LDFLAGS += -lbcrypt
+endif
+TESTS += silentpayments_example
+endif
 endif
 
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