CONTRIB: move contrib/opentracing to addons/ot
This one is the last optional module to build with haproxy, so let's move
it to addons/. It was renamed to "ot" as it was the only one whose USE_*
option did not match the directory name, now this is consistent.
Few changes were required, only the Makefile, and doc were adjusted, as
the directory was already self-contained and relocatable.
diff --git a/addons/ot/Makefile b/addons/ot/Makefile
new file mode 100644
index 0000000..9d9b1bf
--- /dev/null
+++ b/addons/ot/Makefile
@@ -0,0 +1,61 @@
+# USE_OT : enable the OpenTracing filter
+# OT_DEBUG : compile the OpenTracing filter in debug mode
+# OT_INC : force the include path to libopentracing-c-wrapper
+# OT_LIB : force the lib path to libopentracing-c-wrapper
+# OT_RUNPATH : add libopentracing-c-wrapper RUNPATH to haproxy executable
+
+OT_DEFINE =
+OT_CFLAGS =
+OT_LDFLAGS =
+OT_DEBUG_EXT =
+OTC_WRAPPER = opentracing-c-wrapper
+
+ifneq ($(OT_DEBUG),)
+OT_DEBUG_EXT = _dbg
+OT_DEFINE = -DDEBUG_OT
+endif
+
+ifeq ($(OT_INC),)
+OT_CFLAGS = $(shell pkg-config --silence-errors --cflags $(OTC_WRAPPER)$(OT_DEBUG_EXT))
+else
+ifneq ($(wildcard $(OT_INC)/$(OTC_WRAPPER)/.*),)
+OT_CFLAGS = -I$(OT_INC) $(if $(OT_DEBUG),-DOTC_DBG_MEM)
+endif
+endif
+
+ifeq ($(OT_CFLAGS),)
+$(error OpenTracing C wrapper : can't find headers)
+endif
+
+ifeq ($(OT_LIB),)
+OT_LDFLAGS = $(shell pkg-config --silence-errors --libs $(OTC_WRAPPER)$(OT_DEBUG_EXT))
+else
+ifneq ($(wildcard $(OT_LIB)/lib$(OTC_WRAPPER).*),)
+OT_LDFLAGS = -L$(OT_LIB) -l$(OTC_WRAPPER)$(OT_DEBUG_EXT)
+ifneq ($(OT_RUNPATH),)
+OT_LDFLAGS += -Wl,--rpath,$(OT_LIB)
+endif
+endif
+endif
+
+ifeq ($(OT_LDFLAGS),)
+$(error OpenTracing C wrapper : can't find library)
+endif
+
+OPTIONS_OBJS += \
+ addons/ot/src/cli.o \
+ addons/ot/src/conf.o \
+ addons/ot/src/event.o \
+ addons/ot/src/filter.o \
+ addons/ot/src/group.o \
+ addons/ot/src/http.o \
+ addons/ot/src/opentracing.o \
+ addons/ot/src/parser.o \
+ addons/ot/src/pool.o \
+ addons/ot/src/scope.o \
+ addons/ot/src/util.o \
+ addons/ot/src/vars.o
+
+OPTIONS_CFLAGS += $(OT_CFLAGS) -Iaddons/ot/include
+OPTIONS_LDFLAGS += $(OT_LDFLAGS)
+OPTIONS_CFLAGS += $(OT_DEFINE)