[gumby]

Oh I see; we were speaking past each other.

Yes, gcc and clang use the same platform API so if they use the same headers (libstc++ or libc++) then they will indeed use identical structure layout etc.

I meant a "gcc-native" toolchain (gcc + libstdc++) vs "llvm native" (clang++ + libc++) having different layout (and there is even some interoperability between them thanks to work by the llvm team). I realize my need to do this (to try to minimize opting bugs) is a special case, and probably unusual.

[umanwizard]

There is not really anything more “native” about using libc++ with clang as opposed to libstdc++ other than the fact that they happened to be developed by the same project. Using clang with libstdc++ is extremely mainstream and normal.

Actually I would bet that even among clang users, libstdc++ is used more commonly on GNU/Linux (IDK for sure, but it’s my hunch).

[gpderetta]

parent says they wants to use libc++ to catch more bugs. Which is a reasonable use case.