[Bug 197058] [arm] lang/spidermonkey24 fails to build for arm

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197058

--- Comment #8 from Sean Bruno <sbruno at FreeBSD.org> ---
(In reply to Jan Beich from comment #6)
AsmJSSignalHandlers.cpp chunk should probably go into files/patch-bug919968 and
replaced with upstream version.

https://hg.mozilla.org/mozilla-central/rev/07ce4364fbec

> ++#elif CPU(ARM_TRADITIONAL) && OS(FREEBSD) && COMPILER(CLANG)
> ++    static void cacheFlush(void* code, size_t size)
> ++    {
> ++	__clear_cache(code, reinterpret_cast<char*>(code) + size);

Why is this limited to compiler-rt? Wouldn't __clear_cache() from libgcc
implemented via ARM_SYNC_ICACHE for NetBSD also work for us?

^^ Probably because I only test on clang and head right now.  I have no
intention of building package sets for 8/9 ... but might want to build for
stable/10 someday.

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