gcc-4.0.x does not have __sync_synchronize() to be used for XFENCE #8163
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wc_port.h expects __sync_synchronize() in gcc-4.x, but it was introduced since gcc-4.1.0. https://github.com/gcc-mirror/gcc/blob/releases/gcc-4.0/gcc/builtins.def https://github.com/gcc-mirror/gcc/blob/releases/gcc-4.1.0/gcc/builtins.def It would be safer to deal gcc-4.0 as gcc-3.x or older one.
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wc_port.h expects __sync_synchronize() in gcc-4.x, but it was introduced since gcc-4.1.0.
Please find the end of gcc/builtins.def in gcc-4.0 branch and gcc-4.1.0 (sorry, the changeset between gcc-4.0.4 and gcc-4.1.0 is too huge for github.com's comparison feature to display well).
gcc-4.0.x gcc/builtins.def
gcc-4.1.0 gcc/builtins.def
It would be safer to deal gcc-4.0 as gcc-3.x or older one.
Description
To build wolfSSL by ancient gcc on ancient platform, the C preprocessor-based function availability classification is improved.
Testing
Building wolfSSL with gcc-4.0.0 (on FreeBSD 5.5) finishes. Without this modification, the built libwolfssl.so would have an unresolvable reference to __sync_synchronize(), and it makes the linking of wolfcrypt/benchmark/benchmark failed as
Checklist