How much space needed to compile gcc-5.4.0-r3? [solved]

Message

engineermdr · Post by **engineermdr** » Tue Sep 05, 2017 5:18 am

I tried to emerge gcc-5.4.0-r3 with 3G of free disk space. The compile consumed all that space and it failed. How much space is needed to compile gcc these days? Many ebuilds check for the needed disk space at the beginning, but apparently not gcc. I mounted a spare 32G partition - I hope that's enough.

Post by **fedeliallalinea** » Tue Sep 05, 2017 5:55 am

A parallel make use more ram, you can try with a lesser value of -j (MAKEOPTS in make.conf)

engineermdr · Post by **engineermdr** » Tue Sep 05, 2017 1:38 pm

RAM was not an issue. It's disk space I had to expand.

Josef.95 · Post by **Josef.95** » Tue Sep 05, 2017 1:42 pm

Hm, I think ~6 GB should be fine (minimum).

Post by Hu » Wed Sep 06, 2017 1:05 am

It depends in part on what build options you enabled. Also, beware that generating debug information consumes substantially more space, even if Portage strips that information before install. Check that you do not have -g or similar options in CFLAGS / CXXFLAGS.

engineermdr · Post by **engineermdr** » Wed Sep 06, 2017 4:22 am

I was just building a base system with the default profile and USE flags in a virtualbox image.

Code: Select all

[ebuild   R    ] sys-devel/gcc-5.4.0-r3:5.4.0::gentoo  USE="cxx fortran (multilib) nls nptl openmp sanitize vtv (-altivec) (-awt) -cilk -debug -doc (-fixed-point) -gcj -go -graphite (-hardened) (-jit) (-libssp) -mpx -nopie -nossp -objc -objc++ -objc-gc -regression-test -vanilla" 0 KiB

Last time I tried this, and I'll admit probably a couple years ago or so, I was able to do so in a 8G disk image. This wasn't the case this time.

My main machine has more than enough disk space and memory that I hadn't thought about minimum requirements in a long while. The Handbook doesn't provide much in the way of minimum sizes either, so I thought I'd ask here. I think I have my answer given the 6G suggestion given earlier.

Elleni · Post by **Elleni** » Wed Oct 04, 2017 2:23 am

I recently could not build gcc-5.4.0-r3 with 7GB mounted tmpfs /tmp, so I tried with 8GB and that was enough and did the trick.

Post by **dilfridge** » Fri Oct 06, 2017 9:54 pm

There's an open bug about this, the missing disk space check is a known problem.

It's not fixed yet because the needed disk space depends a lot on the circumstances. Debug info yes or no, how about the fortran flag or similar, or are you even building a multilib compiler (gasp)?!

And noone so far did the work of estimating all the combinations.

eccerr0r · Post by **eccerr0r** » Sat Oct 07, 2017 3:53 am

I was able to build gcc-5.4.0-r3 in a 5GB tmpfs somehow (8GB RAM, using 8 threads). The 5GB was specifically for firefox, not gcc, so I guess this is something else to look out for...