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This release contains only the 1 byte fix for perl RT #132974
The Changes file is still incomplete (see cpan RT #122854)
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"$XS_Constant{$type}" is almost always a 2nd PUSH on stack, but EU::C
only extended by 1, not 2. This mistake didn't become visible until
the panic assert was added 5.27.2
panic: XSUB Compress::Raw::Bzip2::constant (Bzip2.c) failed to extend arg
stack: base=1b13010, sp=1b13020, hwm=1b13018
Numbers in message are from my 64bit perl, so 0x1b13020-0x1b13018=0x8
which is one 64 bit pointer stack slot, which is exactly the mistake that
this patch fixes in EU::C. See RT ticket associated with this commit for
details.
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The Changes file is still horriby out of date, and the trickier-to-fix (or
test) bugs remain open in RT, but it seems better to get a release out with
the fixed bugs than delay it further whilst figuring out the cleanest way to
fix the open bugs. The perfect is the enemy of the good.
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The code generated by ExtUtils::Constant can look something like:
static int
constant (..., IV *iv_return) {
switch (...) {
case ...:
*iv_return = ...;
return PERL_constant_ISIV;
...
}
}
{
int type;
IV iv;
type = constant(..., &iv);
switch (type) {
case PERL_constant_ISIV:
PUSHi(iv);
...
}
}
and the compiler isn't clever enough to realise that the value of iv
is only used in the code path where its been set.
So initialise it to zero to shut gcc up. Ditto nv and pv.
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Use a lexical in place of repeated lc()'s in WriteConstants.
Require ExtUtils::Constant::ProxySubs early, to avoid leaving empty files if it
fails for any reason.
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This is only useful with the code that generates Proxy Constant Subroutines, as
this adds all known constants to the symbol table at compile time, meaning that
the only calls to AUTOLOAD will be to load constants not available on this
platform, or for invalid constant names.
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