Remove minimum toolchain soft-error

Summary:
Back in January I changed the minimum toolchain version required to build clang
and LLVM: D57264. Since then we've release LLVM 8, following
[our process](http://llvm.org/docs/DeveloperPolicy.html#toolchain)
it's therefore now a good time to remove the soft-error and officially deprecate
older toolchains. I tried this out last Tursday night to see if any bots
complained, and I saw no complaints. I also manually audited bots and didn't see
any bot that should break, but their toolchain information is unreliable and
some bots are offline.

Once this patch stick we'll move to C++14 as we've
[already agreed](http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html).

Subscribers: mgorny, jkorous, dexonsmith, llvm-commits, EricWF, thakis, chandlerc

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66188

llvm-svn: 368799

diff --git a/llvm/cmake/modules/CheckCompilerVersion.cmake b/llvm/cmake/modules/CheckCompilerVersion.cmake
index 2f4d75f..ad70d85 100644 (file)
--- a/llvm/cmake/modules/CheckCompilerVersion.cmake
+++ b/llvm/cmake/modules/CheckCompilerVersion.cmake
@@ -4,11 +4,11 @@
 
 include(CheckCXXSourceCompiles)
 
-set(GCC_MIN 4.8)
+set(GCC_MIN 5.1)
 set(GCC_SOFT_ERROR 5.1)
-set(CLANG_MIN 3.1)
+set(CLANG_MIN 3.5)
 set(CLANG_SOFT_ERROR 3.5)
-set(APPLECLANG_MIN 3.1)
+set(APPLECLANG_MIN 6.0)
 set(APPLECLANG_SOFT_ERROR 6.0)
 
 # https://en.wikipedia.org/wiki/Microsoft_Visual_C#Internal_version_numbering
@@ -17,7 +17,7 @@ set(MSVC_MIN 19.1)
 set(MSVC_SOFT_ERROR 19.1)
 
 # Map the above GCC versions to dates: https://gcc.gnu.org/develop.html#timeline
-set(GCC_MIN_DATE 20130322)
+set(GCC_MIN_DATE 20150422)
 set(GCC_SOFT_ERROR_DATE 20150422)
 
 

diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
index 9825e84..a874b49 100644 (file)
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -235,15 +235,6 @@ popular host toolchains for specific minimum versions in our build systems:
 * GCC 5.1
 * Visual Studio 2017
 
-The below versions currently soft-error as we transition to the new compiler
-versions listed above. The LLVM codebase is currently known to compile correctly
-with the following compilers, though this will change in the near future:
-
-* Clang 3.1
-* Apple Clang 3.1
-* GCC 4.8
-* Visual Studio 2017
-
 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.
 Also note that older versions of these compilers have often crashed or