Emerging dev-qt/qtwebengine-5.12.4 fails in compile phase

[kingoftherats]

Halfway through the compilation of dev-qt/qtwebengine-5.12.4it fails. I thought it might be a problem with the current ebuild just being broken, but I have been syncing and giving another go at compiling it for a few weeks, with the same results. When the compilation fails portage tells me:

[jorgicio]

The "internal compiler error" means the problem is not of the code, but of the compiler itself. Normally due to (ab)use of resources at compilation time.

As a suggestion, compile qtwebengine when you're not using your PC, with desktop session logged out, using only the tty and, depending on your amount of RAM available, use a non-TMPFS setting. See here for more info. If you have too much RAM, you can skip that latest step.

[fedeliallalinea]

You can also try simply to reduce parallel make option (MAKEOPTS)
_________________
Questions are guaranteed in life; Answers aren't.

[Josef.95]

And please try it without ccache

[diem]

Sorry to re-animate an aging thread, but I was experiencing the exact same failure and found a solution (that worked for me) thanks to this thread. I had tried reducing MAKEOPTS to j1 and had configured Portage's TMPDIR to use tmpfs, neither of which solved the issue (though tmpfs is speeding up other builds nicely ).

What worked for me was ensuring qtwebengine's local USE variable named jumbo-build is enabled. The variable causes the compilation to combine source files together to shorten build times at the expense of higher RAM usage. It was enabled by default in <5.12, but has been set disabled by default since >=5.12. Re-enabling it, in my case, worked around the fault that is this thread's subject. Further, combined with using tmpfs, it brought the bonus of halving the package's build time (see below).

HTH,

Ian