fixes #577 target library dependencies should be public

This is a significant refactor of the library configuration.
We use the modern package configuration helper, with a template
script that also does the find_package dance for any of our
dependencies.

We also have restructured the code so that most protocols and
transports have their configuration isolated to their own CMakeLists
file, reducing the size of the global CMakeLists file.

1 files changed, 14 insertions, 16 deletions

diff --git a/src/supplemental/http/CMakeLists.txt b/src/supplemental/http/CMakeLists.txt
index ed7d5ae2..0fe9e7c5 100644
--- a/src/supplemental/http/CMakeLists.txt
+++ b/src/supplemental/http/CMakeLists.txt
@@ -8,28 +8,26 @@
 # found online at https://opensource.org/licenses/MIT.
 #
 
+option (NNG_ENABLE_HTTP "Enable HTTP API" ON)
+if (NNG_ENABLE_HTTP)
+    set(NNG_SUPP_HTTP ON)
+endif()
+mark_as_advanced(NNG_ENABLE_HTTP)
+
+set(_HDRS supplemental/http/http.h)
+set(_SRCS ${_HDRS} supplemental/http/http_public.c supplemental/http/http_api.h)
+
 if (NNG_SUPP_HTTP)
-        set(HTTP_DEFINES -DNNG_SUPP_HTTP)
-        set(HTTP_HEADERS
-                supplemental/http/http.h)
-        set(HTTP_SOURCES
-                supplemental/http/http.h
-                supplemental/http/http_api.h
+        set(_DEFS -DNNG_SUPP_HTTP)
+        list(APPEND _SRCS
                 supplemental/http/http_client.c
                 supplemental/http/http_chunk.c
                 supplemental/http/http_conn.c
                 supplemental/http/http_msg.c
                 supplemental/http/http_public.c
                 supplemental/http/http_server.c)
-else()
-        set(HTTP_SOURCES
-                supplemental/http/http.h
-                supplemental/http/http_api.h
-                supplemental/http/http_public.c)
-        set(HTTP_HEADERS
-                supplemental/http/http.h)
 endif()
 
-set(NNG_DEFINES ${NNG_DEFINES} ${HTTP_DEFINES} PARENT_SCOPE)
-set(NNG_SOURCES ${NNG_SOURCES} ${HTTP_SOURCES} PARENT_SCOPE)
-set(NNG_HEADERS ${NNG_HEADERS} ${HTTP_HEADERS} PARENT_SCOPE)
+set(NNG_DEFS ${NNG_DEFS} ${_DEFS} PARENT_SCOPE)
+set(NNG_SRCS ${NNG_SRCS} ${_SRCS} PARENT_SCOPE)
+set(NNG_HDRS ${NNG_HDRS} ${_HDRS} PARENT_SCOPE)