Fix travis and appveyor builds.

.appveyor/install.bat

@@ -27,7 +27,7 @@ GOTO:EOF
     call:logInfo "Clone dependencies repository"
     git clone -q --depth 1 --branch=master https://github.com/telegramdesktop/dependencies_windows.git %LIB_DIR%
     cd %LIB_DIR%
-
+    git clone https://github.com/Microsoft/Range-V3-VS2015 range-v3
     if exist prepare.bat (
         call prepare.bat
     ) else (

.travis.yml

@@ -33,8 +33,8 @@ addons:
       - dpatch
       - equivs
       - fakeroot
-      - g++-6
+      - g++-7
-      - gcc-6
+      - gcc-7
       - git
       - gnome-common
       - gobject-introspection
@@ -58,8 +58,8 @@ addons:
       - yasm
 
 before_install:
-  - export CXX="g++-6" CC="gcc-6"
+  - export CXX="g++-7" CC="gcc-7"
-  - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6
+  - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7
   - sudo update-alternatives --config gcc
   - g++ --version
 

.travis/build.sh

@@ -27,6 +27,9 @@ GYP_PATH="$BUILD/gyp"
 GYP_CACHE_VERSION="3"
 GYP_PATCH="$UPSTREAM/Telegram/Patches/gyp.diff"
 
+RANGE_PATH="$BUILD/range-v3"
+RANGE_CACHE_VERSION="3"
+
 VA_PATH="$BUILD/libva"
 VA_CACHE_VERSION="3"
 
@@ -85,6 +88,9 @@ build() {
   # Patched GYP (supports cmake precompiled headers)
   getGYP
 
+  # Range v3
+  getRange
+
   # Guideline Support Library
   getGSL
 
@@ -178,6 +184,52 @@ buildXkbCommon() {
   sudo ldconfig
 }
 
+getRange() {
+  travisStartFold "Getting range-v3"
+
+  local RANGE_CACHE="$CACHE/range-v3"
+  local RANGE_CACHE_FILE="$RANGE_CACHE/.cache.txt"
+  local RANGE_CACHE_KEY="${RANGE_CACHE_VERSION}"
+  local RANGE_CACHE_OUTDATED="1"
+
+  if [ ! -d "$RANGE_CACHE" ]; then
+    mkdir -p "$RANGE_CACHE"
+  fi
+
+  ln -sf "$RANGE_CACHE" "$RANGE_PATH"
+
+  if [ -f "$RANGE_CACHE_FILE" ]; then
+    local RANGE_CACHE_KEY_FOUND=`tail -n 1 $RANGE_CACHE_FILE`
+    if [ "$RANGE_CACHE_KEY" == "$RANGE_CACHE_KEY_FOUND" ]; then
+      RANGE_CACHE_OUTDATED="0"
+    else
+      info_msg "Cache key '$RANGE_CACHE_KEY_FOUND' does not match '$RANGE_CACHE_KEY', getting range-v3"
+    fi
+  fi
+  if [ "$RANGE_CACHE_OUTDATED" == "1" ]; then
+    buildRange
+    sudo echo $RANGE_CACHE_KEY > "$RANGE_CACHE_FILE"
+  else
+    info_msg "Using cached range-v3"
+  fi
+}
+
+buildRange() {
+  info_msg "Downloading range-v3"
+
+  if [ -d "$EXTERNAL/range-v3" ]; then
+    rm -rf "$EXTERNAL/range-v3"
+  fi
+  cd $RANGE_PATH
+  rm -rf *
+
+  cd "$EXTERNAL"
+  git clone --depth=1 https://github.com/ericniebler/range-v3
+
+  cd "$EXTERNAL/range-v3"
+  cp -r * "$RANGE_PATH/"
+}
+
 getVa() {
   travisStartFold "Getting libva"
 
@@ -628,6 +680,7 @@ buildTelegram() {
       -Dlinux_path_vdpau=$VDPAU_PATH \
       -Dlinux_path_ffmpeg=$FFMPEG_PATH \
       -Dlinux_path_openal=$OPENAL_PATH \
+      -Dlinux_path_range=$RANGE_PATH \
       -Dlinux_path_qt=$QT_PATH \
       -Dlinux_path_breakpad=$BREAKPAD_PATH \
       -Dlinux_path_libexif_lib=/usr/local/lib \

Telegram/gyp/telegram_linux.gypi

@@ -34,6 +34,7 @@
       'linux_path_vdpau%': '/usr/local',
       'linux_path_breakpad%': '/usr/local',
       'linux_path_opus_include%': '<(libs_loc)/opus/include',
+      'linux_path_range%': '/usr/local',
     },
     'include_dirs': [
       '/usr/local/include',
@@ -41,6 +42,7 @@
       '<(linux_path_openal)/include',
       '<(linux_path_breakpad)/include/breakpad',
       '<(linux_path_opus_include)',
+      '<(linux_path_range)/include',
     ],
     'library_dirs': [
       '/usr/local/lib',