Fixes build. Added cURL example with combined build support.

.travis.yml

@@ -37,14 +37,7 @@ matrix:
   - os: osx
     osx_image: xcode10.2
     env:
-      - PLATFORM=OS USE_STRICT_COMPILER_CHECKS=1
-  - os: osx
-    osx_image: xcode10.2
-    env:
-      - PLATFORM=OS BUILD_LIBRESSL=1
-  allow_failures:
-    - env: PLATFORM=OS BUILD_LIBRESSL=1
-    - env: PLATFORM=OS USE_STRICT_COMPILER_CHECKS=1
+      - PLATFORM=OS64COMBINED BUILD_CURL=1 USE_XCODE=1
 
 install: true
 

.travis/build.sh

@@ -7,7 +7,7 @@ is-variable-set() {
 PLATFORM=${PLATFORM:-OS}             # Default to "OS" platform
 BUILD_SHARED=${BUILD_SHARED:-0}
 USE_XCODE=${USE_XCODE:-0}
-BUILD_LIBRESSL=${BUILD_LIBRESSL:-0}
+BUILD_CURL=${BUILD_CURL:-0}
 USE_STRICT_COMPILER_CHECKS=${USE_STRICT_COMPILER_CHECKS:-0}
 
 SHARED_EXT=""
@@ -25,9 +25,9 @@ if [[ ${USE_STRICT_COMPILER_CHECKS} -eq 1 ]]; then
     USE_STRICT_COMPILER_CHECKS_EXT="-DENABLE_STRICT_TRY_COMPILE=1"
 fi
 
-if [[ ${BUILD_LIBRESSL} -eq 1 ]]; then
-  mkdir -p example/example-libressl/build
-  pushd example/example-libressl/build
+if [[ ${BUILD_CURL} -eq 1 ]]; then
+  mkdir -p example/example-curl/build
+  pushd example/example-curl/build
   cmake .. \
     ${GENERATOR_EXT} -DCMAKE_TOOLCHAIN_FILE=../../ios.toolchain.cmake \
     -DPLATFORM=${PLATFORM} ${USE_STRICT_COMPILER_CHECKS_EXT} || exit 1
@@ -42,4 +42,4 @@ else
    || exit 1
   cmake --build . --config Release --target install || exit 1
   popd
-fi
+fi

example/example-curl/CMakeLists.txt

@@ -0,0 +1,47 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(external-curl)
+include(ExternalProject)
+
+set(CURL_VERSION 7.65.3)
+string(REPLACE "." "_" CURL_VERSION_USCORE ${CURL_VERSION})
+
+list(APPEND CMAKE_ARGS
+    "-DCMAKE_TOOLCHAIN_FILE:PATH=${CMAKE_TOOLCHAIN_FILE}"
+    "-DBUILD_SHARED_LIBS=OFF"
+    "-DCMAKE_USE_OPENSSL=OFF"
+    "-DBUILD_CURL_EXE=OFF"
+    "-DBUILD_TESTING=FALSE"
+    "-DHAVE_LIBIDN2=FALSE"
+    "-DCURL_CA_PATH=none"
+    "-DCURL_DISABLE_FTP=ON"
+    "-DCURL_DISABLE_LDAP=ON"
+    "-DCURL_DISABLE_LDAPS=ON"
+    "-DCURL_DISABLE_TELNET=ON"
+    "-DCURL_DISABLE_DICT=ON"
+    "-DCURL_DISABLE_FILE=ON"
+    "-DCURL_DISABLE_TFTP=ON"
+    "-DCURL_DISABLE_RTSP=ON"
+    "-DCURL_DISABLE_POP3=ON"
+    "-DCURL_DISABLE_IMAP=ON"
+    "-DCURL_DISABLE_SMTP=ON"
+    "-DCURL_DISABLE_GOPHER=ON"
+)
+
+if(IOS)
+    list(APPEND CMAKE_ARGS
+        "-DPLATFORM=${PLATFORM}"
+    )
+endif()
+
+message(STATUS "Preparing external project \"curl\" with args:")
+foreach(CMAKE_ARG ${CMAKE_ARGS})
+    message(STATUS "-- ${CMAKE_ARG}")
+endforeach()
+
+ExternalProject_add(
+    curl
+    URL https://github.com/curl/curl/releases/download/curl-${CURL_VERSION_USCORE}/curl-${CURL_VERSION}.tar.gz
+    PREFIX curl
+    CMAKE_ARGS "${CMAKE_ARGS}"
+    )

ios.toolchain.cmake

@@ -376,12 +376,11 @@ endif()
 set(ENABLE_VISIBILITY_INT ${ENABLE_VISIBILITY} CACHE BOOL "Whether or not to hide symbols (-fvisibility=hidden)" ${FORCE_CACHE})
 # Set strict compiler checks or not
 if(NOT DEFINED ENABLE_STRICT_TRY_COMPILE)
-  # Unless specified, disable symbols visibility by default
+  # Unless specified, disable strict try_compile()
   set(ENABLE_STRICT_TRY_COMPILE FALSE)
   message(STATUS "Using NON-strict compiler checks by default. ENABLE_STRICT_TRY_COMPILE not provided!")
 endif()
-set(ENABLE_STRICT_TRY_COMPILE_INT ${ENABLE_STRICT_TRY_COMPILE} CACHE BOOL "Whether or not to use strict compiler
-checks" ${FORCE_CACHE})
+set(ENABLE_STRICT_TRY_COMPILE_INT ${ENABLE_STRICT_TRY_COMPILE} CACHE BOOL "Whether or not to use strict compiler checks" ${FORCE_CACHE})
 # Get the SDK version information.
 execute_process(COMMAND xcodebuild -sdk ${CMAKE_OSX_SYSROOT} -version SDKVersion
   OUTPUT_VARIABLE SDK_VERSION
@@ -429,6 +428,15 @@ set(CMAKE_C_CREATE_STATIC_LIBRARY
   "${BUILD_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
 set(CMAKE_CXX_CREATE_STATIC_LIBRARY
   "${BUILD_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
+# Find the toolchain's provided install_name_tool if none is found on the host
+if(NOT CMAKE_INSTALL_NAME_TOOL)
+  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find install_name_tool
+      OUTPUT_VARIABLE CMAKE_INSTALL_NAME_TOOL_INT
+      ERROR_QUIET
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+  set(CMAKE_INSTALL_NAME_TOOL ${CMAKE_INSTALL_NAME_TOOL_INT} CACHE STRING "" ${FORCE_CACHE})
+  message(STATUS "Using install_name_tool: ${CMAKE_INSTALL_NAME_TOOL}")
+endif()
 # Get the version of Darwin (OS X) of the host.
 execute_process(COMMAND uname -r
   OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION
@@ -446,8 +454,8 @@ if(MODERN_CMAKE)
 
   # Provide flags for a combined FAT library build on newer CMake versions
   if(PLATFORM_INT MATCHES ".*COMBINED")
-    set(CMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH NO CACHE INTERNAL "")
-    set(CMAKE_IOS_INSTALL_COMBINED YES CACHE INTERNAL "")
+    set(CMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH NO CACHE INTERNAL "" ${FORCE_CACHE})
+    set(CMAKE_IOS_INSTALL_COMBINED YES CACHE INTERNAL "" ${FORCE_CACHE})
     message(STATUS "Will combine built (static) artifacts into FAT lib...")
   endif()
 else()
@@ -608,40 +616,29 @@ set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
 set(CMAKE_FIND_LIBRARY_SUFFIXES ".tbd" ".dylib" ".so" ".a")
 set(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-install_name")
 
-# Hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old
-# build tree (where install_name_tool was hardcoded) and where
-# CMAKE_INSTALL_NAME_TOOL isn't in the cache and still cmake didn't fail in
-# CMakeFindBinUtils.cmake (because it isn't rerun) hardcode
-# CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did
-# before, Alex.
-if(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
-  find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
-endif(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
-
 # Set the find root to the iOS developer roots and to user defined paths.
-set(CMAKE_FIND_ROOT_PATH ${CMAKE_DEVELOPER_ROOT} ${CMAKE_OSX_SYSROOT_INT}
-  ${CMAKE_PREFIX_PATH} CACHE STRING "Root path that will be prepended to all search paths")
+set(CMAKE_FIND_ROOT_PATH ${CMAKE_OSX_SYSROOT_INT} ${CMAKE_PREFIX_PATH} CACHE STRING "Root path that will be prepended
+ to all search paths")
 # Default to searching for frameworks first.
 set(CMAKE_FIND_FRAMEWORK FIRST)
 # Set up the default search directories for frameworks.
 set(CMAKE_FRAMEWORK_PATH
-  ${CMAKE_DEVELOPER_ROOT}/Library/Frameworks
   ${CMAKE_DEVELOPER_ROOT}/Library/PrivateFrameworks
   ${CMAKE_OSX_SYSROOT_INT}/System/Library/Frameworks
-  ${CMAKE_FRAMEWORK_PATH} CACHE STRING "Frameworks search paths")
+  ${CMAKE_FRAMEWORK_PATH} CACHE STRING "Frameworks search paths" ${FORCE_CACHE})
 
 # By default, search both the specified iOS SDK and the remainder of the host filesystem.
 if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
   set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH CACHE STRING "" ${FORCE_CACHE})
 endif()
 if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
-  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH CACHE STRING "" ${FORCE_CACHE})
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY CACHE STRING "" ${FORCE_CACHE})
 endif()
 if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
-  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH CACHE STRING "" ${FORCE_CACHE})
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY CACHE STRING "" ${FORCE_CACHE})
 endif()
 if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
-  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH CACHE STRING "" ${FORCE_CACHE})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY CACHE STRING "" ${FORCE_CACHE})
 endif()
 
 #