[llvm] r284497 - [docs] Increase minimum supported GCC version for building LLVM to 4.8
Teresa Johnson via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 18 10:17:37 PDT 2016
Author: tejohnson
Date: Tue Oct 18 12:17:37 2016
New Revision: 284497
URL: http://llvm.org/viewvc/llvm-project?rev=284497&view=rev
Log:
[docs] Increase minimum supported GCC version for building LLVM to 4.8
Summary:
The RFC proposal sent to increase the minimum required GCC version
to 4.8 received a lot of support. See the following thread:
http://lists.llvm.org/pipermail/llvm-dev/2016-October/105955.html,
This patch implements that by updating the docs. I believe the
references to libstdc++ 4.7 issues can be removed as well, please
let me know if that is not the case or if they should be updated
a different way.
Reviewers: rengolin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D25683
Modified:
llvm/trunk/cmake/modules/CheckCompilerVersion.cmake
llvm/trunk/docs/CodingStandards.rst
llvm/trunk/docs/GettingStarted.rst
Modified: llvm/trunk/cmake/modules/CheckCompilerVersion.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/CheckCompilerVersion.cmake?rev=284497&r1=284496&r2=284497&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/CheckCompilerVersion.cmake (original)
+++ llvm/trunk/cmake/modules/CheckCompilerVersion.cmake Tue Oct 18 12:17:37 2016
@@ -1,4 +1,4 @@
-# Check if the host compiler is new enough. LLVM requires at least GCC 4.7,
+# Check if the host compiler is new enough. LLVM requires at least GCC 4.8,
# MSVC 2013, or Clang 3.1.
include(CheckCXXSourceCompiles)
@@ -8,8 +8,8 @@ if(NOT DEFINED LLVM_COMPILER_CHECKED)
if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
- if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
- message(FATAL_ERROR "Host GCC version must be at least 4.7!")
+ if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
+ message(FATAL_ERROR "Host GCC version must be at least 4.8!")
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
@@ -35,7 +35,7 @@ std::atomic<float> x(0.0f);
int main() { return (float)x; }"
LLVM_NO_OLD_LIBSTDCXX)
if(NOT LLVM_NO_OLD_LIBSTDCXX)
- message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
+ message(FATAL_ERROR "Host Clang must be able to find libstdc++4.8 or newer!")
endif()
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
Modified: llvm/trunk/docs/CodingStandards.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/CodingStandards.rst?rev=284497&r1=284496&r2=284497&view=diff
==============================================================================
--- llvm/trunk/docs/CodingStandards.rst (original)
+++ llvm/trunk/docs/CodingStandards.rst Tue Oct 18 12:17:37 2016
@@ -189,7 +189,7 @@ you hit a type trait which doesn't work
traits header to emulate it.
.. _the libstdc++ manual:
- http://gcc.gnu.org/onlinedocs/gcc-4.7.3/libstdc++/manual/manual/status.html#status.iso.2011
+ http://gcc.gnu.org/onlinedocs/gcc-4.8.0/libstdc++/manual/manual/status.html#status.iso.2011
Other Languages
---------------
Modified: llvm/trunk/docs/GettingStarted.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/GettingStarted.rst?rev=284497&r1=284496&r2=284497&view=diff
==============================================================================
--- llvm/trunk/docs/GettingStarted.rst (original)
+++ llvm/trunk/docs/GettingStarted.rst Tue Oct 18 12:17:37 2016
@@ -202,7 +202,7 @@ uses the package and provides other deta
Package Version Notes
=========================================================== ============ ==========================================
`GNU Make <http://savannah.gnu.org/projects/make>`_ 3.79, 3.79.1 Makefile/build processor
-`GCC <http://gcc.gnu.org/>`_ >=4.7.0 C/C++ compiler\ :sup:`1`
+`GCC <http://gcc.gnu.org/>`_ >=4.8.0 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`
=========================================================== ============ ==========================================
@@ -261,7 +261,7 @@ For the most popular host toolchains we
our build systems:
* Clang 3.1
-* GCC 4.7
+* GCC 4.8
* Visual Studio 2013
Anything older than these toolchains *may* work, but will require forcing the
@@ -275,9 +275,6 @@ recent version may be required to suppor
We track certain versions of software that are *known* to fail when used as
part of the host toolchain. These even include linkers at times.
-**GCC 4.6.3 on ARM**: Miscompiles ``llvm-readobj`` at ``-O3``. A test failure
-in ``test/Object/readobj-shared-object.test`` is one symptom of the problem.
-
**GNU ld 2.16.X**. Some 2.16.X versions of the ld linker will produce very long
warning messages complaining that some "``.gnu.linkonce.t.*``" symbol was
defined in a discarded section. You can safely ignore these messages as they are
@@ -294,19 +291,6 @@ intermittent failures when building LLVM
symptom is an error about cyclic dependencies. We recommend upgrading to a
newer version of Gold.
-**Clang 3.0 with libstdc++ 4.7.x**: a few Linux distributions (Ubuntu 12.10,
-Fedora 17) have both Clang 3.0 and libstdc++ 4.7 in their repositories. Clang
-3.0 does not implement a few builtins that are used in this library. We
-recommend using the system GCC to compile LLVM and Clang in this case.
-
-**Clang 3.0 on Mageia 2**. There's a packaging issue: Clang can not find at
-least some (``cxxabi.h``) libstdc++ headers.
-
-**Clang in C++11 mode and libstdc++ 4.7.2**. This version of libstdc++
-contained `a bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53841>`__ which
-causes Clang to refuse to compile condition_variable header file. At the time
-of writing, this breaks LLD build.
-
Getting a Modern Host C++ Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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