Invalid memory reference with filter on some archs

[wcampbell0x2a]

The following code:

use xz2::stream::{Filters, LzmaOptions, MtStreamBuilder};

fn main() {
    let dict_size = 0x40000;

    let mut opts = LzmaOptions::new_preset(6).unwrap();
    opts.dict_size(dict_size);

    let mut filters = Filters::new();

    filters.ia64();
    filters.arm();
    filters.arm_thumb();
    filters.lzma2(&opts);


    let stream = MtStreamBuilder::new()
        //.block_size(0x1000)
        .filters(filters)
        .check(xz2::stream::Check::Crc32)
        .encoder()
        .unwrap();
}

causes an invalid memory reference on some arches, including arm-unknown-linux-musleabi.

$ gdb ./target/x86_64-unknown-linux-musl/debug/xz-issue
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Reading symbols from ./target/x86_64-unknown-linux-musl/debug/xz-issue...
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /home/wcampbell/projects/wcampbell/xz-issue/target/x86_64-unknown-linux-musl/debug/xz-issue.
Use `info auto-load python-scripts [REGEXP]' to list them.
(gdb) r
Starting program: /home/wcampbell/projects/wcampbell/xz-issue/target/x86_64-unknown-linux-musl/debug/xz-issue

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f8a2f3 in lzma_mt_block_size (filters=0x7ffff7f638e0) at xz-5.2/src/liblzma/common/filter_encoder.c:237
237            if (fe->block_size != NULL) {

I pushed some code here that shows the issue: https://github.com/wcampbell0x2a/xz2-issue

[wcampbell0x2a]

Interestingly,a master commit: xz-mirror/xz@8f23657#diff-746760992da1ff24d47722ba47d8d7cecf76735f04c809fa39b2350bcec6ec85R263 provides a check if (fe == NULL) and says that this is invalid?

[wcampbell0x2a]

Fixed by adding -D HAVE_DECODER_IA64=1 -D HAVE_ENCODER_IA64=1. Yet another problem caused by this.

It would be nice if they were normal rust features so that isn't hidden.