gollvm build failed

[T Odin]

I'm trying to build gollvm on FreeBSD 13 using the command as mentioned in gollvm source page.

cmake -DCMAKE_BUILD_TYPE=Debug -DLLVM_USE_LINKER=gold -G Ninja ../llvm-project/llvm 

I observed that during configuration it fails for malloc 

Looking for malloc/malloc.h
Looking for malloc/malloc.h - not found

which ends up with subsequent build failures for all the dependencies libffi, libbacktrace with 

Support for mmap() is required -- setup failed.
Call Stack (most recent call first):
tools/gollvm/libgo/CMakeLists.txt:49 (setup_libffi)

I read from the FAQs that support for OS other than Linux wasn't supported. I'd like to clarify the changes required to be ported for compiling and supporting on other OS. 

[Than McIntosh]

Hello,

As I understand it FreeBSD doesn't have any concept of a build essentials package, so in theory /usr/include/malloc.h should always be installed. Are you saying that this file doesn't exist on your system?

Thanks, Than

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[T Odin]

Hi Than,

I see there is malloc.h present in that path.

But, cmake throws one more error even before the mmap issue:

-- Performing Test SPLIT_STACK_FUNCTIONAL
-- Performing Test SPLIT_STACK_FUNCTIONAL - Failed
-- trying -fcf-protection=none workaround
-- Performing Test SPLIT_STACK_WORKAROUND
-- Performing Test SPLIT_STACK_WORKAROUND - Failed
CMake Error at tools/gollvm/cmake/modules/AddGollvm.cmake:68 (message):
  C compiler does not support -fsplit-stack

Call Stack (most recent call first):

  tools/gollvm/CMakeLists.txt:22 (include)

Tried compiling the compile source specified in cmake file manually with fsplit-stack and workaround of fcf-protection=none. 

But, linker is unable to find the symbol __morestack:

ld: error: undefined symbol: __morestack

Can you please help if I'm missing out any configuration ?

Build environment:

clang 13.0.1 on FreeBSD 12.

[Than McIntosh]

Hello,

Normally the definition of __morestack is drawn from libgcc.a, so I would look to see what the story is with libgcc.a on your system.

Here are some things to try:

// Ask clang where it's picking up libgcc.a
$ clang --print-libgcc-file-name
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/libgcc.a
$

// Ask the linker to trace the symbol during linking
$ clang-11  himom.c -fsplit-stack -Wl,-y,__morestack
/usr/bin/ld: /tmp/himom-9cb8d3.o: reference to __morestack
/usr/bin/ld: /usr/bin/../lib/gcc/x86_64-linux-gnu/11/libgcc.a(morestack.o): definition of __morestack
$

Thanks, Than

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