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

[Colin Riley]

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

-----Original Message-----
From: "Sylvestre Ledru" <sylvestre at debian.org>
Sent: ‎24/‎11/‎2013 11:17
To: "lldb-dev at cs.uiuc.edu" <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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