Hi Iain, Thank you for the quick response and the effort to make that feature available.
When I reconfigured/build GCC with --with-gxx-libcxx-include-dir=/usr/include/c++/v1/ , -stdlib= option is now available to take libc++. thanks, Shivam. On Sat, Apr 2, 2022 at 3:21 PM Iain Sandoe <i...@sandoe.co.uk> wrote: > Hi Shivam, > > > On 2 Apr 2022, at 06:57, Shivam Gupta <shivam98....@gmail.com> wrote: > > > > I saw your last year's mail for the same topic on the GCC mailing list - > https://gcc.gnu.org/pipermail/gcc/2020-March/000230.html. > > The patch was applied to GCC-11 (so is available one GCC-11 branch and > will be on GCC-12 when that is released). > > > > I tried today but this option is still not available. > > The option has to be configured when the compiler is built, that also > means that you have to install (and point the configure to) a suitable set > of libc++ headers from the LLVM project (e.g. there is a set here: > https://github.com/iains/llvm-project/tree/9.0.1-gcc-stdlib). > > Generally, GCC is very compatible with the libc++ headers (the changes I > made on that branch were mostly to deal with <coroutine> being in std:: for > GCC and std::experimental:: for LLVM-9). For LLVM libc++ earlier than 9 > there is a missing symbol that GCC uses - but that can be worked around too. > > There have been some changes in more recent (in particular, LLVM-14/main) > libc++ that should make it more compatible. > > Of course, you should pick a version of the libc++ headers than matches > the version used on your system (9 was used for quite a long time, but > recent xcode headers are newer). > > Given that this involves cross-project sources and choosing a suitable > set, probably it is a job for the distributions (e.g. homebrew, macports > etc) to arrange or, for self-built compilers, following in the general > comments above. > > FWIW, I have used this to build quite a few OSS projects on a number of > Darwin versions (hence the comment about GCC being very compatible with > libc++). > > thanks, > Iain. > >
