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[docs] Actually spell out the new version requirements for the host C++

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toolchain of LLVM. These are already being enforced by the build system
and have been discussed quite a few times on the lists, but
documentation is important. =]

Also, garbage collect the majority of the information about broken host
GCC toolchains. These aren't really relevant any more as they're all
older than the minimum requirement. I've left a few notes about
compilers one step older than the current requirement as these compilers
are at least conceivable to use, and it's better to preserve this kind
of hard-won institutional knowledge.

The next step will be some specific docs on how to set up a sufficiently
modern host toolchain if your system doesn't come with one. But that'll
be tomorrow. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202375 91177308-0d34-0410-b5e6-96231b3b80d8
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Chandler Carruth 2014-02-27 10:35:57 +00:00
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@ -220,92 +220,32 @@ Unix utilities. Specifically:
.. _below:
.. _check here:
Broken versions of GCC and other tools
--------------------------------------
Host C++ Toolchain, both Compiler and Standard Library
------------------------------------------------------
LLVM is very demanding of the host C++ compiler, and as such tends to expose
bugs in the compiler. In particular, several versions of GCC crash when trying
to compile LLVM. We routinely use GCC 4.2 (and higher) or Clang. Other
versions of GCC will probably work as well. GCC versions listed here are known
to not work. If you are using one of these versions, please try to upgrade your
GCC to something more recent. If you run into a problem with a version of GCC
not listed here, please `let us know <mailto:llvmdev@cs.uiuc.edu>`_. Please use
the "``gcc -v``" command to find out which version of GCC you are using.
bugs in the compiler. We are also planning to follow improvements and
developments in the C++ language and library reasonably closely. As such, we
require a modern host C++ toolchain, both compiler and standard library, in
order to build LLVM.
**GCC versions prior to 3.0**: GCC 2.96.x and before had several problems in the
STL that effectively prevent it from compiling LLVM.
For the most popular host toolchains we check for specific minimum versions in
our build systems:
**GCC 3.2.2 and 3.2.3**: These versions of GCC fails to compile LLVM with a
bogus template error. This was fixed in later GCCs.
* Clang 3.1
* GCC 4.7
* Visual Studio 2012
**GCC 3.3.2**: This version of GCC suffered from a `serious bug
<http://gcc.gnu.org/PR13392>`_ which causes it to crash in the
"``convert_from_eh_region_ranges_1``" GCC function.
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
miscompiled LLVM.
**Cygwin GCC 3.3.3**: The version of GCC 3.3.3 commonly shipped with Cygwin does
not work.
For less widely used host toolchains such as ICC or xlC, be aware that a very
recent version may be required to support all of the C++ features used in LLVM.
**SuSE GCC 3.3.3**: The version of GCC 3.3.3 shipped with SuSE 9.1 (and possibly
others) does not compile LLVM correctly (it appears that exception handling is
broken in some cases). Please download the FSF 3.3.3 or upgrade to a newer
version of GCC.
**GCC 3.4.0 on linux/x86 (32-bit)**: GCC miscompiles portions of the code
generator, causing an infinite loop in the llvm-gcc build when built with
optimizations enabled (i.e. a release build).
**GCC 3.4.2 on linux/x86 (32-bit)**: GCC miscompiles portions of the code
generator at -O3, as with 3.4.0. However gcc 3.4.2 (unlike 3.4.0) correctly
compiles LLVM at -O2. A work around is to build release LLVM builds with
"``make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ...``"
**GCC 3.4.x on X86-64/amd64**: GCC `miscompiles portions of LLVM
<http://llvm.org/PR1056>`__.
**GCC 3.4.4 (CodeSourcery ARM 2005q3-2)**: this compiler miscompiles LLVM when
building with optimizations enabled. It appears to work with "``make
ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O1``" or build a debug build.
**IA-64 GCC 4.0.0**: The IA-64 version of GCC 4.0.0 is known to miscompile LLVM.
**Apple Xcode 2.3**: GCC crashes when compiling LLVM at -O3 (which is the
default with ENABLE_OPTIMIZED=1. To work around this, build with
"``ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2``".
**GCC 4.1.1**: GCC fails to build LLVM with template concept check errors
compiling some files. At the time of this writing, GCC mainline (4.2) did not
share the problem.
**GCC 4.1.1 on X86-64/amd64**: GCC `miscompiles portions of LLVM
<http://llvm.org/PR1063>`__ when compiling llvm itself into 64-bit code. LLVM
will appear to mostly work but will be buggy, e.g. failing portions of its
testsuite.
**GCC 4.1.2 on OpenSUSE**: Seg faults during libstdc++ build and on x86_64
platforms compiling md5.c gets a mangled constant.
**GCC 4.1.2 (20061115 (prerelease) (Debian 4.1.1-21)) on Debian**: Appears to
miscompile parts of LLVM 2.4. One symptom is ValueSymbolTable complaining about
symbols remaining in the table on destruction.
**GCC 4.1.2 20071124 (Red Hat 4.1.2-42)**: Suffers from the same symptoms as the
previous one. It appears to work with ENABLE_OPTIMIZED=0 (the default).
**Cygwin GCC 4.3.2 20080827 (beta) 2**: Users `reported
<http://llvm.org/PR4145>`_ various problems related with link errors when using
this GCC version.
**Debian GCC 4.3.2 on X86**: Crashes building some files in LLVM 2.6.
**GCC 4.3.3 (Debian 4.3.3-10) on ARM**: Miscompiles parts of LLVM 2.6 when
optimizations are turned on. The symptom is an infinite loop in
``FoldingSetImpl::RemoveNode`` while running the code generator.
**SUSE 11 GCC 4.3.4**: Miscompiles LLVM, causing crashes in ValueHandle logic.
**GCC 4.3.5 and GCC 4.4.5 on ARM**: These can miscompile ``value >> 1`` even at
``-O0``. A test failure in ``test/Assembler/alignstack.ll`` is one symptom of
the problem.
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.