Contrib toolchains for compilers (rebased !1112)

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Bot test PACKAGE[ PACKAGE2 ...]|all in TOOLCHAIN|all [(only|also) for ARCH-LABEL-COMPILER-BUILDTYPE] please!

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To ensure patches required for existing LCG branches are not lost, please add the respective labels: alsoTargeting:LCG_102-patches, alsoTargeting:master, etc.

added test-needed label

assigned to @dkonst

requested review from @dkonst

mentioned in merge request !1112 (closed)

added 1 commit

• cf0cadca - Move contrib toolchains into separte dierctroy in cmake/toolchin

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added 1 commit

• b1d37615 - -DGCC_INSTALL_PREFIX is depricated in llvm/clang

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added 1 commit

• 0adcd60d - Find toolchain files also in toolchain/contrib

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added 1 commit

• 66c024dc - Improve llvm recipe, add BPF to LLVM targets, improve bash in clang setup scripts

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@dkonst

We can merge this, right?

added 87 commits

• 66c024dc...915b9fe2 - 53 commits from branch master
• 915b9fe2...22cdd3d4 - 24 earlier commits
• 02b74563 - Add gcc12.multilib toolchain
• 2e9e1570 - Add clang17 toochain
• bbe971fc - Use make boostrap building gcc
• 5c98371c - Add toolchain for gcc 14.1
• 6c70046a - Update cmake scripts
• 484fefd6 - Add clang18 and clang19 toolchains
• 52e95861 - Move contrib toolchains into separte dierctroy in cmake/toolchin
• 24b60ff3 - -DGCC_INSTALL_PREFIX is depricated in llvm/clang
• 871bc734 - Find toolchain files also in toolchain/contrib
• a3b8d6f5 - Improve llvm recipe, add BPF to LLVM targets, improve bash in clang setup scripts

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enabled an automatic merge when all merge checks for a3b8d6f5 pass

merged

mentioned in commit 48ae5af0

added sweep:ignore label