[PATCH] D122976: Bump minimum toolchain version

[Tobias Hieta via Phabricator via llvm-commits]

thieta created this revision.
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RFC: https://discourse.llvm.org/t/rfc-increasing-the-gcc-and-clang-requirements-to-support-c-17-in-llvm

Following the policy here: https://llvm.org/docs/DeveloperPolicy.html#toolchain


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122976

Files:
  llvm/cmake/modules/CheckCompilerVersion.cmake
  llvm/docs/GettingStarted.rst


Index: llvm/docs/GettingStarted.rst
===================================================================
--- llvm/docs/GettingStarted.rst
+++ llvm/docs/GettingStarted.rst
@@ -175,7 +175,7 @@
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
 `CMake <http://cmake.org/>`__                               >=3.13.4     Makefile/workspace generator
-`GCC <http://gcc.gnu.org/>`_                                >=5.1.0      C/C++ compiler\ :sup:`1`
+`GCC <http://gcc.gnu.org/>`_                                >=7.1.0      C/C++ compiler\ :sup:`1`
 `python <http://www.python.org/>`_                          >=3.6        Automated test suite\ :sup:`2`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`3`
 `GNU Make <http://savannah.gnu.org/projects/make>`_         3.79, 3.79.1 Makefile/build processor\ :sup:`4`
@@ -235,10 +235,10 @@
 standards<CodingStandards>`. To enforce this language version, we check the most
 popular host toolchains for specific minimum versions in our build systems:
 
-* Clang 3.5
-* Apple Clang 6.0
-* GCC 5.1
-* Visual Studio 2019
+* Clang 5.0
+* Apple Clang 9.3
+* GCC 7.1
+* Visual Studio 2019 16.7
 
 Anything older than these toolchains *may* work, but will require forcing the
 build system with a special option and is not really a supported host platform.
@@ -303,11 +303,11 @@
 .. _github gist:
   https://gist.github.com/application2000/73fd6f4bf1be6600a2cf9f56315a2d91
 
-Easy steps for installing GCC 5.1.0:
+Easy steps for installing GCC 7.1.0:
 
 .. code-block:: console
 
-  % gcc_version=5.1.0
+  % gcc_version=7.1.0
   % wget https://ftp.gnu.org/gnu/gcc/gcc-${gcc_version}/gcc-${gcc_version}.tar.bz2
   % wget https://ftp.gnu.org/gnu/gcc/gcc-${gcc_version}/gcc-${gcc_version}.tar.bz2.sig
   % wget https://ftp.gnu.org/gnu/gnu-keyring.gpg
Index: llvm/cmake/modules/CheckCompilerVersion.cmake
===================================================================
--- llvm/cmake/modules/CheckCompilerVersion.cmake
+++ llvm/cmake/modules/CheckCompilerVersion.cmake
@@ -5,11 +5,11 @@
 include(CheckCXXSourceCompiles)
 
 set(GCC_MIN 5.1)
-set(GCC_SOFT_ERROR 5.1)
+set(GCC_SOFT_ERROR 7.1)
 set(CLANG_MIN 3.5)
-set(CLANG_SOFT_ERROR 3.5)
+set(CLANG_SOFT_ERROR 5.0)
 set(APPLECLANG_MIN 6.0)
-set(APPLECLANG_SOFT_ERROR 6.0)
+set(APPLECLANG_SOFT_ERROR 9.3)
 
 # https://en.wikipedia.org/wiki/Microsoft_Visual_C#Internal_version_numbering
 # _MSC_VER == 1920 MSVC++ 14.20 Visual Studio 2019 Version 16.0
@@ -19,7 +19,7 @@
 
 # Map the above GCC versions to dates: https://gcc.gnu.org/develop.html#timeline
 set(GCC_MIN_DATE 20150422)
-set(GCC_SOFT_ERROR_DATE 20150422)
+set(GCC_SOFT_ERROR_DATE 20170502)
 
 
 if(DEFINED LLVM_COMPILER_CHECKED)


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