toolchain/gcc: Add GCC 10.1.0

[wongsyrone]

IMPORTANT: I send this pull request because I can't see my patch listed on patchwork. This pull request is the same as the one sent to the mailing list.

Compared to GCC 9:

881-no_tm_section.patch modified based on upstream change

See https://gcc.gnu.org/gcc-10/porting_to.html for more info

Compiled and run tested on x86_64

Signed-off-by: Syrone Wong wong.syrone@gmail.com

[wongsyrone]

Cc @neheb @hauke @nbd168 @xback @yousong

[neheb]

A bunch of packages should break with this :). I'll test when I can.

[yousong]

For the patches dir part, please consider doing this in at least two separate commits, first a verbatim copy of the ones from 9.3.0, then changes in this addition, for ease of tracking and review.

[wongsyrone]

Commits I made to fix GCC 10 compilation:

main repo:

wongsyrone/lede-1@ebfa84b

Luci:

wongsyrone/luci-1@0cdbe35

packages feed:

wongsyrone/packages-1@56d9bc7
wongsyrone/packages-1@17ac8ab
wongsyrone/packages-1@7ca6c73
wongsyrone/packages-1@3a1683e

[neheb]

Locally libupnp is failing as well. GCC8 > 9 had less breakage.

[wongsyrone]

Sorry, I cannot fix the packages I didn't use. You can apply the porting guide GCC guys provided.

I quote it here:

As a workaround, legacy C code where all tentative definitions should be placed into a common block can be compiled with -fcommon.

I think we should blame the package maintainer instead of a new compiler version enforcing C standard.

[neheb]

Another casualty: openwrt/luci#4196

Those extern commits look weird to me. Should probably use static.

edit: ah didn't realize you had the luci one in there.

[wongsyrone]

extern means the real definition locates in the corresponding source file instead of the header file.

[wongsyrone]

I found my patch listed on patchwork.

[neheb]

Running this on an Archer C7v2. Works fine. malta works fine as well.

[wongsyrone]

Any update on this PR?

[ynezz]

For the patches dir part, please consider doing this in at least two separate commits, first a verbatim copy of the ones from 9.3.0, then changes in this addition, for ease of tracking and review.

I second that request which you've probably missed. It's hard to review (needs additional time) otherwise.

[wongsyrone]

@ynezz @yousong Already split into three commits.

[ynezz]

Thanks! Pulled into my staging tree at https://git.openwrt.org/openwrt/staging/ynezz.git

[wongsyrone]

@ynezz Sorry. I cannot find my commits in your staging tree.