[lldb-dev] lldb 3.4 rc1 is failing with gcc 4.6

[Todd Fiala]

FWIW I have the build process we're using over here on Ubuntu 12.04
building with gcc 4.8.2 since I hit build errors on that path as well.  I
tried several other paths that each failed for different reasons before
settling on that one.


On Sun, Nov 24, 2013 at 7:22 AM, Colin Riley <colin at codeplay.com> wrote:

>  We noticed this too, but assumed it was just progress on the uptake of
> cpp11 features. We would rather not need to upgrade to 4.8 either, but
> understand if this is just the path that is being taken.
>
> Colin
>  ------------------------------
> From: Sylvestre Ledru <sylvestre at debian.org>
> Sent: 24/11/2013 11:17
> To: lldb-dev at cs.uiuc.edu
> Subject: [lldb-dev] lldb 3.4 rc1 is failing with gcc 4.6
>
> Hello,
>
> I am working on the port of lldb on the various Debian architectures
> [1]. On some of them (sparc, s390x, powerpc, ia64, ...),
> the version of gcc used is 4.6 and lldb fails to build because of this
> declaration.
>     Mutex *m_mutex = nullptr;
> in include/lldb/Utility/Iterable.h
>
> It fails with:
>
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:197:22:
> sorry, unimplemented: non-static data member initializers
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:197:22:
> error: 'constexpr' needed for in-class initialization of static data member
> 'm_mutex' of non-integral type
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:
> In constructor 'lldb_private::LockingAdaptedIterable<C, E,
> A>::LockingAdaptedIterable(C&, lldb_private::Mutex&)':
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:201:9:
> error: class 'lldb_private::LockingAdaptedIterable<C, E, A>' does not have
> any field named 'm_mutex'
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:203:9:
> error: 'm_mutex' was not declared in this scope
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:
> In constructor 'lldb_private::LockingAdaptedIterable<C, E,
> A>::LockingAdaptedIterable(lldb_private::LockingAdaptedIterable<C, E,
> A>&&)':
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:208:9:
> error: class 'lldb_private::LockingAdaptedIterable<C, E, A>' does not have
> any field named 'm_mutex'
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:
> In destructor 'lldb_private::LockingAdaptedIterable<C, E,
> A>::~LockingAdaptedIterable()':
> /«BUILDDIR»/llvm-toolchain-3.4-3.4~+rc1/tools/lldb/source/../include/lldb/Utility/Iterable.h:215:13:
> error: 'm_mutex' was not declared in this scope
>
>
> Is there a workaround to tackle this limitation ? I could switch to gcc
> 4.8 but it would break the backport of lldb on http://llvm.org/apt/
> (especially on old Ubuntu without gcc 4.8)
>
> Thanks,
> Sylvestre
>
>
>
> [1] https://buildd.debian.org/status/package.php?p=llvm-toolchain-3.4
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