home-brew install fails on High Sierra about libcbor

[PJK]

I pushed some minor fixes to https://github.com/PJK/homebrew-libcbor to make the formula compatible with the latest homebrew, but I doubt that solves the root cause of your issue.

Could you please try brew install -v libcbor again with an up-to-date homebrew (homebrew update)? For reference, I get https://gist.github.com/PJK/c3c9bcaf327c402d456c761bd674a0a5 on a 10.13 mac.

[cabo]

Maybe I don't understand Mac builds well enough, but the surprising part is that src/libcbor.a consists of .o files of the form:

arrays.c.o:            LLVM bitcode, wrapper x86_64
builder_callbacks.c.o: LLVM bitcode, wrapper x86_64
bytestrings.c.o:       LLVM bitcode, wrapper x86_64
callbacks.c.o:         LLVM bitcode, wrapper x86_64
cbor.c.o:              LLVM bitcode, wrapper x86_64
common.c.o:            LLVM bitcode, wrapper x86_64
encoders.c.o:          LLVM bitcode, wrapper x86_64
encoding.c.o:          LLVM bitcode, wrapper x86_64
floats_ctrls.c.o:      LLVM bitcode, wrapper x86_64
ints.c.o:              LLVM bitcode, wrapper x86_64
loaders.c.o:           LLVM bitcode, wrapper x86_64
maps.c.o:              LLVM bitcode, wrapper x86_64
memory_utils.c.o:      LLVM bitcode, wrapper x86_64
serialization.c.o:     LLVM bitcode, wrapper x86_64
stack.c.o:             LLVM bitcode, wrapper x86_64
streaming.c.o:         LLVM bitcode, wrapper x86_64
strings.c.o:           LLVM bitcode, wrapper x86_64
tags.c.o:              LLVM bitcode, wrapper x86_64
unicode.c.o:           LLVM bitcode, wrapper x86_64

nm -p is helpless.

[PJK]

I know next to nothing about OSX details, but I believe the reason this doesn't emit plain object files (if that is what you're alluding) is that LTO is enabled for release builds which triggers this behavior in clang (https://github.com/mull-project/mull/blob/master/Docs/HowToGetLLVMBitcode.md).

[PJK]

If the above is the real cause, it will be solved by Homebrew/homebrew-core#50588