Problem: draft build not enabled for git repo

cppzmq does not follow other zeromq projects where draft builds are
enabled by default for git repository.

Solution: revert back code where ENABLE_DRAFTS in set to ON if .git
directory exists

.travis.yml

@@ -16,7 +16,7 @@ matrix:
     - os: osx
       osx_image: xcode9.1
       compiler: clang
-      env: DRAFT=1
+      env: ENABLE_DRAFTS=ON
 
     ##########################################################
     # GCC on Linux
@@ -50,7 +50,7 @@ matrix:
           packages:
             - g++-7
       env:
-        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7" DRAFT=1
+        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7" ENABLE_DRAFTS=ON
   # - env: BUILD_TYPE=cmake DO_CLANG_FORMAT_CHECK=1 CLANG_FORMAT=/usr/local/clang-5.0.0/bin/clang-format
     # os: linux
     # addons:

CMakeLists.txt

@@ -19,7 +19,11 @@ if (ZeroMQ_FOUND AND (NOT TARGET libzmq OR NOT TARGET libzmq-static))
   message(FATAL_ERROR "ZeroMQ version not supported!")
 endif()
 
-OPTION (ENABLE_DRAFTS "Build and install draft classes and methods" OFF)
+if (EXISTS "${CMAKE_SOURCE_DIR}/.git")
+    OPTION (ENABLE_DRAFTS "Build and install draft classes and methods" ON)
+else ()
+    OPTION (ENABLE_DRAFTS "Build and install draft classes and methods" OFF)
+endif ()
 if (ENABLE_DRAFTS)
     ADD_DEFINITIONS (-DZMQ_BUILD_DRAFT_API)
     set (pkg_config_defines "-DZMQ_BUILD_DRAFT_API=1")

ci_build.sh

@@ -4,20 +4,13 @@ set -x
 set -e
 
 BUILD_TYPE=${BUILD_TYPE:-cmake}
+ZMQ_VERSION=${ZMQ_VERSION:-4.2.5}
+ENABLE_DRAFTS=${ENABLE_DRAFTS:-OFF}
 LIBZMQ=${PWD}/libzmq-build
 CPPZMQ=${PWD}/cppzmq-build
-ZMQ_VERSION="4.2.5"
-DRAFT=${DRAFT:-0}
 # Travis machines have 2 cores
 JOBS=2
 
-if [ "${DRAFT}" = "1" ] ; then
-    # if we enable drafts during the libzmq cmake build, the pkgconfig
-    # data should set ZMQ_BUILD_DRAFT_API in dependent builds, but this
-    # does not appear to work (TODO)
-    export ZEROMQ_CMAKE_FLAGS="-DENABLE_DRAFTS=ON"
-fi
-
 libzmq_install() {
     curl -L https://github.com/zeromq/libzmq/archive/v"${ZMQ_VERSION}".tar.gz \
       >zeromq.tar.gz
@@ -26,7 +19,7 @@ libzmq_install() {
         cmake -Hlibzmq-${ZMQ_VERSION} -B${LIBZMQ} -DWITH_PERF_TOOL=OFF \
                                                   -DZMQ_BUILD_TESTS=OFF \
                                                   -DCMAKE_BUILD_TYPE=Release \
-                                                  ${ZEROMQ_CMAKE_FLAGS}
+                                                  -DENABLE_DRAFTS=${ENABLE_DRAFTS}
         cmake --build ${LIBZMQ} -- -j${JOBS}
     elif [ "${BUILD_TYPE}" = "pkgconfig" ] ; then
         pushd .
@@ -46,7 +39,7 @@ cppzmq_build() {
     if [ "${BUILD_TYPE}" = "cmake" ] ; then
         export ZeroMQ_DIR=${LIBZMQ}
     fi
-    cmake -H. -B${CPPZMQ} ${ZEROMQ_CMAKE_FLAGS}
+    cmake -H. -B${CPPZMQ} -DENABLE_DRAFTS=${ENABLE_DRAFTS}
     cmake --build ${CPPZMQ} -- -j${JOBS}
     popd
 }