cmake: Add libqrencode optional package support

Author: hebasto

CMakeLists.txt

@@ -144,6 +144,13 @@ endif()
 
 cmake_dependent_option(ENABLE_EXTERNAL_SIGNER "Enable external signer support." ON "NOT WIN32" OFF)
 
+cmake_dependent_option(WITH_QRENCODE "Enable QR code support." ON "BUILD_GUI" OFF)
+if(WITH_QRENCODE)
+  find_package(PkgConfig REQUIRED)
+  pkg_check_modules(libqrencode REQUIRED IMPORTED_TARGET libqrencode)
+  set(USE_QRCODE TRUE)
+endif()
+
 if(BUILD_GUI)
   set(qt_components Core Gui Widgets LinguistTools)
   if(ENABLE_WALLET)
@@ -490,6 +497,7 @@ message("   - using NAT-PMP .................... ${WITH_NATPMP}")
 message("   - using UPnP ....................... ${WITH_MINIUPNPC}")
 message("  ZeroMQ .............................. ${WITH_ZMQ}")
 message("  USDT tracing ........................ ${WITH_USDT}")
+message("  QR code (GUI) ....................... ${WITH_QRENCODE}")
 message("Tests:")
 message("  test_bitcoin ........................ ${BUILD_TESTS}")
 message("  bench_bitcoin ....................... ${BUILD_BENCH}")

cmake/bitcoin-config.h.in

@@ -141,6 +141,9 @@
 /* Define if BDB support should be compiled in */
 #cmakedefine USE_BDB 1
 
+/* Define if QR support should be compiled in */
+#cmakedefine USE_QRCODE 1
+
 /* Define if sqlite support should be compiled in */
 #cmakedefine USE_SQLITE 1