aemerson added a comment.

In D58320#1402254 <https://reviews.llvm.org/D58320#1402254>, @peter.smith wrote:

> The implementation changes in the Darwin toolchain look fine to me, although 
> with respect to the command line option I think Petr Hosek's message on 
> cfe-dev is interesting:
>
> > GCC implements -nolibc which could be used to achieve the same effect when 
> > combined with -nostartfiles (and -nostdlib++ when compiling C++). I'd 
> > prefer that approach not only because it improves compatibility with with 
> > GCC, but also because it matches existing flag scheme which is subtractive 
> > rather than additive (i.e. -nodefaultlibs, -nostdlib, -nostdlib++, 
> > -nostartfiles). Clang already defines this flag but the only toolchain that 
> > currently supports it is DragonFly.
>
> Looking at https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html (quoted here 
> for convenience)
>
> > -nostartfiles
> >  Do not use the standard system startup files when linking. The standard 
> > system libraries are used normally, unless -nostdlib, -nolibc, or 
> > -nodefaultlibs is used.
> > -nolibc
> >  Do not use the C library or system libraries tightly coupled with it when 
> > linking. Still link with the startup files, libgcc or toolchain provided 
> > language support libraries such as libgnat, libgfortran or libstdc++ unless 
> > options preventing their inclusion are used as well. This typically removes 
> > -lc from the link command line, as well as system libraries that normally 
> > go with it and become meaningless when absence of a C library is assumed, 
> > for example -lpthread or -lm in some configurations. This is intended for 
> > bare-board targets when there is indeed no C library available.
>
> It does seem like these options accomplish what -flink_builtins_rt do with 
> the added advantage of being more portable with gcc. If they don't work for 
> you it will be worth double checking with Petr.


Thanks for taking a look. I've replied on the thread for the problem that 
approach presents.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58320/new/

https://reviews.llvm.org/D58320



_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits

Reply via email to