[llvm-dev] A libc in LLVM

[Shoaib Meenai via llvm-dev]

Note that libc++abi's build also has to use certain tricks to make this possible, e.g. using -D_LIBCPP_DISABLE_EXTERN_TEMPLATE to disable libc++ headers from using extern templates (which would create a dependency on the libc++ dylib).

On 7/15/19, 12:26 PM, "llvm-dev on behalf of Ben Craig via llvm-dev" <llvm-dev-bounces at lists.llvm.org on behalf of llvm-dev at lists.llvm.org> wrote:

    Note that libc++abi (i.e. the thing that implements much of the C++ runtime) is implemented with a subset of C++.  It is possible to use a subset of C++ without pulling in a dynamic runtime.
    
    > -----Original Message-----
    > From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of David
    > Greene via llvm-dev
    > Sent: Monday, July 15, 2019 2:02 PM
    > To: David Jones <dlj at google.com>
    > Cc: Aaron Ballman via llvm-dev <llvm-dev at lists.llvm.org>; Marshall Clow
    > <mclow.lists at gmail.com>
    > Subject: [EXTERNAL] Re: [llvm-dev] A libc in LLVM
    > 
    > David Jones <dlj at google.com> writes:
    > 
    > >  >> * Provide C symbols as specified by the standards, but take
    > > advantage  >> and use C++ language facilities for the core implementation.
    > >
    > >  Does this mean C programs would require a C++ runtime?  If not, how
    > > will  the project ensure that?
    > >
    > > Shooting from the hip: no. Turning off exceptions, RTTI, and static
    > > initializers (i.e., things which require a guard variable) is probably
    > > enough to obviate the need for the runtime.
    > 
    > What about bits of the standard library that are not header-only?  My guess
    > is that the set of those things may be platform-dependent.
    > 
    >                     -David
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