Index: cmake/modules/CheckCompilerVersion.cmake
===================================================================
--- cmake/modules/CheckCompilerVersion.cmake
+++ cmake/modules/CheckCompilerVersion.cmake
@@ -1,5 +1,5 @@
-# Check if the host compiler is new enough. LLVM requires at least GCC 4.8,
-# MSVC 2015 (Update 3), or Clang 3.1.
+# Check if the host compiler is new enough. LLVM requires at least GCC 5.1,
+# MSVC 2015 (Update 3), or Clang 3.5.
 
 include(CheckCXXSourceCompiles)
 
@@ -8,12 +8,12 @@
 
   if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
     if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
-        message(FATAL_ERROR "Host GCC version must be at least 4.8!")
+      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
+        message(FATAL_ERROR "Host GCC version must be at least 5.1!")
       endif()
     elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
-        message(FATAL_ERROR "Host Clang version must be at least 3.1!")
+      if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
+        message(FATAL_ERROR "Host Clang version must be at least 3.5!")
       endif()
 
       if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
Index: docs/CodingStandards.rst
===================================================================
--- docs/CodingStandards.rst
+++ docs/CodingStandards.rst
@@ -184,7 +184,7 @@
 traits header to emulate it.
 
 .. _the libstdc++ manual:
-  http://gcc.gnu.org/onlinedocs/gcc-4.8.0/libstdc++/manual/manual/status.html#status.iso.2011
+  https://gcc.gnu.org/onlinedocs/gcc-5.1.0/libstdc++/manual/manual/status.html#status.iso.2011
 
 Other Languages
 ---------------
Index: docs/GettingStarted.rst
===================================================================
--- docs/GettingStarted.rst
+++ docs/GettingStarted.rst
@@ -222,7 +222,7 @@
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
 `GNU Make <http://savannah.gnu.org/projects/make>`_         3.79, 3.79.1 Makefile/build processor
-`GCC <http://gcc.gnu.org/>`_                                >=4.8.0      C/C++ compiler\ :sup:`1`
+`GCC <https://gcc.gnu.org/>`_                               >=5.1.0      C/C++ compiler\ :sup:`1`
 `python <http://www.python.org/>`_                          >=2.7        Automated test suite\ :sup:`2`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`3`
 =========================================================== ============ ==========================================
@@ -280,8 +280,8 @@
 For the most popular host toolchains we check for specific minimum versions in
 our build systems:
 
-* Clang 3.1
-* GCC 4.8
+* Clang 3.5
+* GCC 5.1
 * Visual Studio 2015 (Update 3)
 
 Anything older than these toolchains *may* work, but will require forcing the
@@ -343,24 +343,24 @@
 .. _toolchain testing PPA:
   https://launchpad.net/~ubuntu-toolchain-r/+archive/test
 .. _ask ubuntu stack exchange:
-  http://askubuntu.com/questions/271388/how-to-install-gcc-4-8-in-ubuntu-12-04-from-the-terminal
+  https://askubuntu.com/questions/271388/how-to-install-gcc-4-8-in-ubuntu-12-04-from-the-terminal
 
-Easy steps for installing GCC 4.8.2:
+Easy steps for installing GCC 5.1.0:
 
 .. code-block:: console
 
-  % wget https://ftp.gnu.org/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.bz2
-  % wget https://ftp.gnu.org/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.bz2.sig
+  % wget https://ftp.gnu.org/gnu/gcc/gcc-5.1.0/gcc-5.1.0.tar.bz2
+  % wget https://ftp.gnu.org/gnu/gcc/gcc-5.1.0/gcc-5.1.0.tar.bz2.sig
   % wget https://ftp.gnu.org/gnu/gnu-keyring.gpg
-  % signature_invalid=`gpg --verify --no-default-keyring --keyring ./gnu-keyring.gpg gcc-4.8.2.tar.bz2.sig`
+  % signature_invalid=`gpg --verify --no-default-keyring --keyring ./gnu-keyring.gpg gcc-5.1.0.tar.bz2.sig`
   % if [ $signature_invalid ]; then echo "Invalid signature" ; exit 1 ; fi
-  % tar -xvjf gcc-4.8.2.tar.bz2
-  % cd gcc-4.8.2
+  % tar -xvjf gcc-5.1.0.tar.bz2
+  % cd gcc-5.1.0
   % ./contrib/download_prerequisites
   % cd ..
-  % mkdir gcc-4.8.2-build
-  % cd gcc-4.8.2-build
-  % $PWD/../gcc-4.8.2/configure --prefix=$HOME/toolchains --enable-languages=c,c++
+  % mkdir gcc-5.1.0-build
+  % cd gcc-5.1.0-build
+  % $PWD/../gcc-5.1.0/configure --prefix=$HOME/toolchains --enable-languages=c,c++
   % make -j$(nproc)
   % make install
 
@@ -368,7 +368,7 @@
 of this information from.
 
 .. _GCC wiki entry:
-  http://gcc.gnu.org/wiki/InstallingGCC
+  https://gcc.gnu.org/wiki/InstallingGCC
 
 Once you have a GCC toolchain, configure your build of LLVM to use the new
 toolchain for your host compiler and C++ standard library. Because the new