[OpenSmalltalk/opensmalltalk-vm] It should be possible to compile the VM with gcc (#445)

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[OpenSmalltalk/opensmalltalk-vm] It should be possible to compile the VM with gcc (#445)

David T Lewis
 

Currently, compiling the x86_64 vm with gcc lead to VM crashes
This is related to stack handling
We solved following bug by replacing with clang as a workaround:
#433

But having to change compiler is a smell, and we don't have many more compilers available next time we hit such unexplained problem!
The first task would be to understand the root cause.

Note that we also had to use clang for making win64 FFI work
#99
or working around various CI red builds...
#241
See also thread Status of FFI/Alien for X64 Win64 in opensmalltalk-vm mailing list
http://lists.squeakfoundation.org/pipermail/vm-dev/2016-August/023068.html


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