make -C run_rustc fails with error: ‘numeric_limits’ is not a member of ‘std’

[jwaldmann]

as suggested by this repo's README, I am doing (on x86_64 with Fedora 37, also with Debian 5.10)

make -f minicargo.mk  
make -C run_rustc

first command succeeds, but second fails with

...
make[4]: Entering directory '/home/waldmann/software/compiler/mrustc/rustc-1.29.0-src/build'
[  0%] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o   
/home/waldmann/software/compiler/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemang
le.cpp:176:36: error: ‘numeric_limits’ is not a member of ‘std’                             
  176 |   unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();                 
      |                                    ^~~~~~~~~~~~~~                     
/home/waldmann/software/compiler/mrustc/rustc-1.29.0-src/src/llvm/lib/Demangle/ItaniumDemang
le.cpp:176:51: error: expected primary-expression before ‘unsigned’                         
  176 |   unsigned CurrentPackIndex = std::numeric_limits<unsigned>::max();                 
      |                                                   ^~~~~~~~                
...

the build seems to work (at leasts on my Fedora machine) when I prefix both commands with

env RUSTC_VERSION=1.54.0 MRUSTC_TARGET_VER=1.54 OUTDIR_SUF=-1.54.0

[thepowersgang]

That error is from the building of LLVM (a dependency of rustc) By default, rustc 1.29 is built, so the fact that it works in 1.54 means that there's a problem with that older version LLVM and your system (curious that it's having troubles finding a standard C++ header)