Project:Toolchain/Libffi 3.3 porting notes/FFI SYSV
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The problem
On amd64 libffi-3.3_rc0 stopped matching supported ABIs for x86 in the following upstream commit: https://github.com/libffi/libffi/commit/ef76205647bca77796882d31f6ab5e889f461f07
This causes build failures like:
polyffi.cpp:100:14: error: 'FFI_SYSV' was not declared in this scope
{"sysv", FFI_SYSV},
^~~~~~~~
The fix
Namely instead using any of the following enum values
FFI_SYSV,
FFI_UNIX64, /* Unix variants all use the same ABI for x86-64 */
FFI_THISCALL,
FFI_FASTCALL,
FFI_STDCALL,
FFI_PASCAL,
FFI_REGISTER,
FFI_UNIX64 should be used instead.
Example change could look like:
--- a/libpolyml/polyffi.cpp
+++ b/libpolyml/polyffi.cpp
@@ -98,5 +98,7 @@ static struct _abiTable { const char *abiName; ffi_abi abiCode; } abiTable[] =
{"win64", FFI_WIN64},
+#elif defined (X86_64) || (defined (__x86_64__) && defined (X86_DARWIN))
+ {"sysv", FFI_UNIX64},
+ {"unix64", FFI_UNIX64},
#elif defined(X86_ANY)
{"sysv", FFI_SYSV},
- {"unix64", FFI_UNIX64},
#endif