Merge remote-tracking branch 'origin/topic/timw/prometheus-cpp'

* origin/topic/timw/prometheus-cpp:
  FindPrometheusCpp: fix cmake-format
  Prevent prometheus-cpp from passing -DDEBUG down to the civetweb build
  Use add_subdirectory and defined targets instead of manually building
  Add FindPrometheusCpp.cmake

FindPrometheusCpp.cmake

@@ -0,0 +1,33 @@
+set(prometheuscpp_build "${CMAKE_CURRENT_BINARY_DIR}/auxil/prometheus-cpp")
+set(prometheuscpp_src "${CMAKE_CURRENT_SOURCE_DIR}/auxil/prometheus-cpp")
+
+# Reset this to prevent Prometheus from using the internal zeek value and thus building
+# shared libraries instead of static ones.
+set(_sharedlibs ${BUILD_SHARED_LIBS})
+set(BUILD_SHARED_LIBS OFF)
+
+# These need to be reset before setting up Prometheus because otherwise it picks up
+# the -DDEBUG from SetDefaultCompileFlags and causes civetweb to output a bunch of
+# debugging information. Let the library figure out its own flags.
+set(_cxxflags ${CMAKE_CXX_FLAGS})
+set(CMAKE_CXX_FLAGS "")
+set(_cflags ${CMAKE_C_FLAGS})
+set(CMAKE_C_FLAGS "")
+
+option(ENABLE_PUSH "" OFF)
+option(ENABLE_TESTING "" OFF)
+option(GENERATE_PKGCONFIG "" OFF)
+option(CIVETWEB_ENABLE_DEBUG_TOOLS "" OFF)
+
+message("\n==================|  prometheus-cpp Config Summary  |====================\n")
+add_subdirectory(auxil/prometheus-cpp EXCLUDE_FROM_ALL)
+message("=========================================================================\n ")
+
+set(zeekdeps ${zeekdeps} prometheus-cpp::core prometheus-cpp::pull)
+include_directories(BEFORE ${prometheuscpp_src}/pull/include ${prometheuscpp_src}/core/include)
+#include_directories(BEFORE ${prometheuscpp_src}/3rdparty/civetweb/include)
+include_directories(BEFORE ${prometheuscpp_build}/pull/include ${prometheuscpp_build}/core/include)
+
+set(BUILD_SHARED_LIBS ${_sharedlibs})
+set(CMAKE_CXX_FLAGS ${_cxxflags})
+set(CMAKE_C_FLAGS ${_cflags})