Build Failure with --enable-bypass on Modern GCC #37
Description
I'm a student currently studying your Unikernel Linux (UKL) project, and I find the performance optimization concepts fascinating. I've successfully built and run the standard version of the project and have been exploring the advanced configuration flags.
My goal was to test the performance optimizations, specifically the --enable-bypass flag. The standard build works perfectly, but enabling this flag causes a consistent build failure during the glibc compilation with the following C error:
../sysdeps/unix/sysv/linux/x86_64/sysdep.h:226:63: error: expected ‘)’ before ‘;’ token
To debug this, I hypothesized it was a compiler incompatibility with the experimental glibc patches. I tried changing the Docker build environment to older operating systems to get an older GCC version, but the error persisted across all of them:
Fedora 36 (Modern GCC)
Ubuntu 18.04 (GCC 7.x)
Ubuntu 16.04 (GCC 5.x)
My conclusion is that the glibc patches are likely incompatible with the GCC 5.x compiler series and newer. I was wondering if you could confirm this, or if there is a specific known-good build environment (OS, GCC version) that you would recommend for building with the bypass flag enabled?
Thank you for your time and for your work on this interesting project.