dongjianqiang2 wrote: > > > > @MaskRay the reason for adding this option is that gcc supports it. > > > > please refer to > > > > [godbolt.org/z/54sE6zTa1](https://godbolt.org/z/54sE6zTa1) > > > > > > > > > This doesn't answer my question. GCC has a lot of options that Clang > > > doesn't support. An option supported by GCC does not mean that Clang > > > needs to support it. This option has perfect replacement, which makes it > > > even questionable (since to the best of my knowledge `-export-dynamic` > > > driver option is not used) See my previous comment: > > > > GCC's default spec file for Linux does not say how -export-dynamic > > > > translates to ld -export-dynamic. > > > > I think ld --export-dynamic is exclusively caused by > > > > -Wl,--export-dynamic or -rdynamic. > > > > Do you have any example of gcc -export-dynamic uses? > > > > > > This is historically undocumented option. and yes, it can be repalced by > > -rdynamic. See > > [PR47390](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47390). The purpose > > of this pull request is to ensure consistency between the two compilers. If > > you think it's unnecessary to support it, I'm fine with it. : ) > > Thank you for digging this up. So `-export-dynamic` is the only special > `-exxx` option GCC supports. Except this gawk issue (2011) which likely gets > fixed long ago, `gcc -export-dynamic` seems to have no use. This doesn't > justify driver adding an option (that we know is not a good thing) special > case. > > Note that `clang -e xxx` or `clang -exxx` did not work before 2020-07, so > even all `-exxx` `-e xxx` all probably rarely used. We should consider > [#72804 > (comment)](https://github.com/llvm/llvm-project/pull/72804#issuecomment-1820321163)
Currently, we are switching to the llvm compiler in embedded system. In some scenarios, the -e option is used to specify the program entry address. gcc supportes both `-e xxx` and `-exxx`, so it may not be a good idea to support '-e xxx' only. So far, I've only encountered this particular -export-dynamic scenario, the program got native exception due to the wrong entry address. When looking back at the logs. I found this warning "cannot find entry symbol xport-dynamic; defaulting to XXXX". https://github.com/llvm/llvm-project/pull/72781 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
