Add ability to specify more LLVM tools in driver.sh

[tpimh]

Currently, the following can be specified:

• AR: enable llvm-ar by default #127
• AS (not on all architectures): enable clang's integrated assembler for arm64 #163 Add machinery for AS=clang builds #242 driver/travis: Replace AS=clang with LLVM_IAS=1 #261 Enable integrated-as on selected arches on linux-next #274
• CC
• LD (not on all architectures): add lld to the testing matrix #19 If the kernel is linked with LLD, use it also as HOSTLD #71 Support building the arm32 kernel with lld #81 Enable lld for ppc64 #106 link arm32_v5 with LLD #208 link more arm64 stable with LLD #210 Enable LLD for MIPS #259 Enable LLD for i386 #271
• NM: enable llvm-nm by default for all archs #159
• OBJCOPY (except s390): turn on objcopy by default for all targets #141 selectively re-enable llvm-objcopy #212 driver: Enable llvm-objcopy and llvm-strip #253 Allow objcopy and strip binaries to be specified #272
• OBJDUMP (except s390): enable llvm-objdump all archs #161
• OBJSIZE: enable llvm-size by default for all arch's #211
• READELF: driver: Use llvm-readelf #255
• STRIP: enable llvm-strip #160 driver: Enable llvm-objcopy and llvm-strip #253 Allow objcopy and strip binaries to be specified #272

Once it's done, work on #73 can be continued.

[nickdesaulniers]

Re: OBJCOPY, ClangBuiltLinux/linux#480 needs to be retested (I think it's fixed?)

[nathanchance]

I am testing llvm-objcopy now: https://travis-ci.com/nathanchance/continuous-integration/builds/117031908

[tpimh]

All tests show green, probably llvm-objcopy is good enough now (llvm-strip should be as well).

[nathanchance]

Unless llvm-strip started supporting globs (it doesn't look like it according to the bug in ClangBuiltLinux/linux#478, it will still be broken.

On that note, I forgot to test arm64 4.4, which was broken with llvm-objcopy: ClangBuiltLinux/linux#478 (comment)

[nathanchance]

llvm-objcopy is still broken for arm64 4.4 because globs are not supported: https://travis-ci.com/nathanchance/continuous-integration/jobs/211920146

[tapaswenipathak]

Hi folks: Didn't read much, is the ticket done?

[tpimh]

llvm-strip, llvm-objcopy and clang's integrated as are still not used during the build process. No support for globs (ClangBuiltLinux/linux#616) is a big deal for strip and objcopy for some targets.

[tapaswenipathak]

Hey @tpimh! Cool, I see what item you are pointing out. Have we added/implemented contributor covenant code of conduct in the main repositories?

[tpimh]

Have we added/implemented contributor covenant code of conduct in the main repositories?

I don't think so.

[tapaswenipathak]

I will add the ticket for votes.

[tpimh]

I started a new branch (master...no-binutils) where I cherry-picked the commits mentioned in this issue.
Right now it fails to build (except x86_64 which still fails to boot), but I will slowly add patches to resolve build issues.

[tapaswenipathak]

I will be out of the ticket, unsubscribing. Seems like more folks than required.