Julia 1.10 and 1.11 do not compile cleanly with GCC 15

[vchuravy]

Just tried to compile Julia on my local dev machine (yay rolling release).

Fails with errors like: llvm/ADT/SmallVector.h:109:62: error: 'uint64_t' was not declared in this scope
Similar to root-project/root#17444

We likely need the patches from root-project/root#17510

Caused by https://gcc.gnu.org/pipermail/gcc-patches/2024-August/659176.html

For anyone else who runs into this an is looking for a quick solution:

~/s/julia-1.11 (release-1.11)> cat Make.user
override CC=gcc-14
override CXX=g++-14

With the gcc-14 package installed.

[giordano]

I cherry-picked the relevant commits to

• https://github.com/JuliaLang/llvm-project/commits/julia-release/15.x/ (relevant for julia 1.10)
• https://github.com/JuliaLang/llvm-project/commits/julia-release/16.x/ (relevant for julia 1.11)
• https://github.com/JuliaLang/llvm-project/commits/julia-release/17.x/
• https://github.com/JuliaLang/llvm-project/commits/julia-release/18.x/ (relevant for julia 1.12)
• https://github.com/JuliaLang/llvm-project/commits/julia-release/19.x/

[giordano]

Haven't tried, but CXXFLAGS="-include cstdint" may also help with GCC 15, until we rebuild all the relevant versions of libllvm.

[maleadt]

Haven't tried, but CXXFLAGS="-include cstdint" may also help with GCC 15, until we rebuild all the relevant versions of libllvm.

Didn't work here.

I pushed an additional missing patch to the 15-18 branches.

PSA, to use a custom version you can simply add something like this to Make.user:

override USE_BINARYBUILDER_LLVM=0
override LLVM_SHA1=7b28655