Samples: libcurl for Windows with dynamic linking (#2348)

samples/build.gradle

@@ -38,13 +38,13 @@ task buildSh(type: Exec) {
 
 task buildSamplesWithPlatformLibs() {
     dependsOn ':csvparser:assemble'
+    dependsOn ':curl:assemble'
     dependsOn ':echoServer:assemble'
     dependsOn ':globalState:assemble'
     dependsOn ':html5Canvas:assemble'
     dependsOn ':workers:assemble'
 
     if (MPPTools.isMacos() || MPPTools.isLinux()) {
-        dependsOn ':curl:assemble'
         dependsOn ':nonBlockingEchoServer:assemble'
         dependsOn ':tensorflow:assemble'
     }

samples/curl/build.gradle

@@ -9,13 +9,18 @@ repositories {
 }
 
 // Determine host preset.
-def hostPreset = MPPTools.defaultHostPreset(project, [kotlin.presets.macosX64, kotlin.presets.linuxX64])
+def hostPreset = MPPTools.defaultHostPreset(project, [kotlin.presets.macosX64, kotlin.presets.linuxX64, kotlin.presets.mingwX64])
 
 kotlin {
     targets {
         fromPreset(hostPreset, 'curl') {
             compilations.main.outputKinds 'EXECUTABLE'
             compilations.main.entryPoint 'sample.curl.main'
+
+            if (presets.mingwX64 == hostPreset) {
+                // Add lib path to `libcurl` and its dependencies:
+                compilations.main.linkerOpts "-L${MPPTools.mingwPath()}/lib"
+            }
         }
     }
 
@@ -29,6 +34,9 @@ kotlin {
 }
 
 MPPTools.createRunTask(project, 'runProgram', kotlin.targets.curl) {
+    if (kotlin.presets.mingwX64 == hostPreset) {
+        environment 'PATH': "${MPPTools.mingwPath()}/bin"
+    }
     args 'https://www.jetbrains.com/'
 }
 

samples/libcurl/README.md

@@ -1,7 +1,11 @@
 # Curl interop library
 
 This example shows how to build and publish an interop library to communicate with the libcurl,
-HTTP/HTTPS/FTP/etc client library. Debian-like distros may need to `apt-get install libcurl4-openssl-dev`.
+HTTP/HTTPS/FTP/etc client library.
+
+Install libcurl development files. For Mac - `brew install curl`. For Debian-like Linux - use `apt-get install libcurl4-openssl-dev` or `apt-get install libcurl4-gnutls-dev`.
+For Windows - `pacman -S mingw-w64-x86_64-curl` in MinGW64 console, if you do
+not have MSYS2-MinGW64 installed - install it first as described in http://www.msys2.org
 
 To build use `../gradlew assemble`.
 

samples/libcurl/build.gradle

@@ -21,7 +21,7 @@ task cleanLocalRepo(type: Delete) {
 }
 
 // Determine host preset.
-def hostPreset = MPPTools.defaultHostPreset(project, [kotlin.presets.macosX64, kotlin.presets.linuxX64])
+def hostPreset = MPPTools.defaultHostPreset(project, [kotlin.presets.macosX64, kotlin.presets.linuxX64, kotlin.presets.mingwX64])
 
 kotlin {
     targets {
@@ -35,6 +35,9 @@ kotlin {
                         case presets.linuxX64:
                             includeDirs.headerFilterOnly '/usr/include', '/usr/include/x86_64-linux-gnu'
                             break
+                        case presets.mingwX64:
+                            includeDirs.headerFilterOnly "${MPPTools.mingwPath()}/include"
+                            break
                     }
                 }
             }

samples/libcurl/src/nativeInterop/cinterop/libcurl.def

@@ -2,3 +2,4 @@ headers = curl/curl.h
 headerFilter = curl/*
 linkerOpts.osx = -L/opt/local/lib -L/usr/local/opt/curl/lib -lcurl
 linkerOpts.linux = -L/usr/lib64 -L/usr/lib/x86_64-linux-gnu -lcurl
+linkerOpts.mingw = -lcurl

samples/settings.gradle

@@ -21,19 +21,19 @@ enableFeaturePreview('GRADLE_METADATA')
  */
 if (MPPTools.isMacos() || MPPTools.isLinux() || MPPTools.isWindows()) {
     include ':csvparser'
+    include ':curl'
     include ':echoServer'
     include ':globalState'
     include ':html5Canvas'
+    include ':libcurl'
     include ':tetris'
     include ':videoplayer'
     include ':workers'
 }
 
 if (MPPTools.isMacos() || MPPTools.isLinux()) {
-    include ':curl'
     include ':gitchurn'
     include ':gtk'
-    include ':libcurl'
     include ':nonBlockingEchoServer'
     include ':tensorflow'
     include ':torch'