Enable crate on 32-bit architectures

[ignatenkobrain]

full bindgen trace

```rust failures: ---- bindings::bindgen_test_layout_UConverterFromUnicodeArgs stdout ---- thread 'bindings::bindgen_test_layout_UConverterFromUnicodeArgs' panicked at 'assertion failed: `(left == right)` left: `28`, right: `56`: Size of: UConverterFromUnicodeArgs', src/bindings.rs:10144:3 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ---- bindings::bindgen_test_layout__G_fpos_t stdout ---- thread 'bindings::bindgen_test_layout__G_fpos_t' panicked at 'assertion failed: `(left == right)` left: `12`, right: `16`: Size of: _G_fpos_t', src/bindings.rs:744:3 ---- bindings::bindgen_test_layout__IO_marker stdout ---- thread 'bindings::bindgen_test_layout__IO_marker' panicked at 'assertion failed: `(left == right)` left: `12`, right: `24`: Size of: _IO_marker', src/bindings.rs:829:3 ---- bindings::bindgen_test_layout_UConverterToUnicodeArgs stdout ---- thread 'bindings::bindgen_test_layout_UConverterToUnicodeArgs' panicked at 'assertion failed: `(left == right)` left: `28`, right: `56`: Size of: UConverterToUnicodeArgs', src/bindings.rs:10253:3 ---- bindings::bindgen_test_layout__G_fpos64_t stdout ---- thread 'bindings::bindgen_test_layout__G_fpos64_t' panicked at 'assertion failed: `(left == right)` left: `12`, right: `16`: Size of: _G_fpos64_t', src/bindings.rs:783:3 ---- bindings::bindgen_test_layout__IO_FILE stdout ---- thread 'bindings::bindgen_test_layout__IO_FILE' panicked at 'assertion failed: `(left == right)` left: `124`, right: `216`: Size of: _IO_FILE', src/bindings.rs:910:3 ---- bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_1 stdout ---- thread 'bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_1' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of __pthread_cond_s__bindgen_ty_1', src/bindings.rs:12079:3 ---- bindings::bindgen_test_layout___pthread_cond_s stdout ---- thread 'bindings::bindgen_test_layout___pthread_cond_s' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of __pthread_cond_s', src/bindings.rs:12211:3 ---- bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_2 stdout ---- thread 'bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_2' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of __pthread_cond_s__bindgen_ty_2', src/bindings.rs:12174:3 ---- bindings::bindgen_test_layout___pthread_internal_list stdout ---- thread 'bindings::bindgen_test_layout___pthread_internal_list' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: __pthread_internal_list', src/bindings.rs:11866:3 ---- bindings::bindgen_test_layout___pthread_mutex_s stdout ---- thread 'bindings::bindgen_test_layout___pthread_mutex_s' panicked at 'assertion failed: `(left == right)` left: `32`, right: `40`: Size of: __pthread_mutex_s', src/bindings.rs:11912:3 ---- bindings::bindgen_test_layout___sigset_t stdout ---- thread 'bindings::bindgen_test_layout___sigset_t' panicked at 'assertion failed: `(left == right)` left: `64`, right: `128`: Size of: __sigset_t', src/bindings.rs:11537:3 ---- bindings::bindgen_test_layout___pthread_rwlock_arch_t stdout ---- thread 'bindings::bindgen_test_layout___pthread_rwlock_arch_t' panicked at 'assertion failed: `(left == right)` left: `48`, right: `56`: Size of: __pthread_rwlock_arch_t', src/bindings.rs:11721:3 ---- bindings::bindgen_test_layout___va_list_tag stdout ---- thread 'bindings::bindgen_test_layout___va_list_tag' panicked at 'assertion failed: `(left == right)` left: `16`, right: `24`: Size of: __va_list_tag', src/bindings.rs:24263:3 ---- bindings::bindgen_test_layout__htmlElemDesc stdout ---- thread 'bindings::bindgen_test_layout__htmlElemDesc' panicked at 'assertion failed: `(left == right)` left: `36`, right: `64`: Size of: _htmlElemDesc', src/bindings.rs:15756:3 ---- bindings::bindgen_test_layout__htmlEntityDesc stdout ---- thread 'bindings::bindgen_test_layout__htmlEntityDesc' panicked at 'assertion failed: `(left == right)` left: `12`, right: `24`: Size of: _htmlEntityDesc', src/bindings.rs:15918:3 ---- bindings::bindgen_test_layout__uconv_t stdout ---- thread 'bindings::bindgen_test_layout__uconv_t' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _uconv_t', src/bindings.rs:10987:3 ---- bindings::bindgen_test_layout__xlinkHandler stdout ---- thread 'bindings::bindgen_test_layout__xlinkHandler' panicked at 'assertion failed: `(left == right)` left: `12`, right: `24`: Size of: _xlinkHandler', src/bindings.rs:13339:3 ---- bindings::bindgen_test_layout__xmlAttr stdout ---- thread 'bindings::bindgen_test_layout__xmlAttr' panicked at 'assertion failed: `(left == right)` left: `48`, right: `96`: Size of: _xmlAttr', src/bindings.rs:3275:3 ---- bindings::bindgen_test_layout__xmlAttribute stdout ---- thread 'bindings::bindgen_test_layout__xmlAttribute' panicked at 'assertion failed: `(left == right)` left: `64`, right: `120`: Size of: _xmlAttribute', src/bindings.rs:2209:3 ---- bindings::bindgen_test_layout__xmlBuffer stdout ---- thread 'bindings::bindgen_test_layout__xmlBuffer' panicked at 'assertion failed: `(left == right)` left: `20`, right: `32`: Size of: _xmlBuffer', src/bindings.rs:1952:3 ---- bindings::bindgen_test_layout__xmlChRangeGroup stdout ---- thread 'bindings::bindgen_test_layout__xmlChRangeGroup' panicked at 'assertion failed: `(left == right)` left: `16`, right: `24`: Size of: _xmlChRangeGroup', src/bindings.rs:16304:3 ---- bindings::bindgen_test_layout__xmlCharEncodingHandler stdout ---- thread 'bindings::bindgen_test_layout__xmlCharEncodingHandler' panicked at 'assertion failed: `(left == right)` left: `28`, right: `56`: Size of: _xmlCharEncodingHandler', src/bindings.rs:11034:3 ---- bindings::bindgen_test_layout__xmlDOMWrapCtxt stdout ---- thread 'bindings::bindgen_test_layout__xmlDOMWrapCtxt' panicked at 'assertion failed: `(left == right)` left: `16`, right: `32`: Size of: _xmlDOMWrapCtxt', src/bindings.rs:4100:3 ---- bindings::bindgen_test_layout__xmlDoc stdout ---- thread 'bindings::bindgen_test_layout__xmlDoc' panicked at 'assertion failed: `(left == right)` left: `96`, right: `176`: Size of: _xmlDoc', src/bindings.rs:3817:3 ---- bindings::bindgen_test_layout__xmlDtd stdout ---- thread 'bindings::bindgen_test_layout__xmlDtd' panicked at 'assertion failed: `(left == right)` left: `64`, right: `128`: Size of: _xmlDtd', src/bindings.rs:3081:3 ---- bindings::bindgen_test_layout__xmlElement stdout ---- thread 'bindings::bindgen_test_layout__xmlElement' panicked at 'assertion failed: `(left == right)` left: `56`, right: `112`: Size of: _xmlElement', src/bindings.rs:2809:3 ---- bindings::bindgen_test_layout__xmlEntity stdout ---- thread 'bindings::bindgen_test_layout__xmlEntity' panicked at 'assertion failed: `(left == right)` left: `76`, right: `136`: Size of: _xmlEntity', src/bindings.rs:7018:3 ---- bindings::bindgen_test_layout__xmlEnumeration stdout ---- thread 'bindings::bindgen_test_layout__xmlEnumeration' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlEnumeration', src/bindings.rs:2151:3 ---- bindings::bindgen_test_layout__xmlError stdout ---- thread 'bindings::bindgen_test_layout__xmlError' panicked at 'assertion failed: `(left == right)` left: `52`, right: `88`: Size of: _xmlError', src/bindings.rs:5134:3 ---- bindings::bindgen_test_layout__xmlGlobalState stdout ---- thread 'bindings::bindgen_test_layout__xmlGlobalState' panicked at 'assertion failed: `(left == right)` left: `516`, right: `968`: Size of: _xmlGlobalState', src/bindings.rs:14023:3 ---- bindings::bindgen_test_layout__xmlID stdout ---- thread 'bindings::bindgen_test_layout__xmlID' panicked at 'assertion failed: `(left == right)` left: `24`, right: `48`: Size of: _xmlID', src/bindings.rs:3423:3 ---- bindings::bindgen_test_layout__xmlNode stdout ---- thread 'bindings::bindgen_test_layout__xmlNode' panicked at 'assertion failed: `(left == right)` left: `60`, right: `120`: Size of: _xmlNode', src/bindings.rs:3598:3 ---- bindings::bindgen_test_layout__xmlLocationSet stdout ---- thread 'bindings::bindgen_test_layout__xmlLocationSet' panicked at 'assertion failed: `(left == right)` left: `12`, right: `16`: Size of: _xmlLocationSet', src/bindings.rs:24133:3 ---- bindings::bindgen_test_layout__xmlNodeSet stdout ---- thread 'bindings::bindgen_test_layout__xmlNodeSet' panicked at 'assertion failed: `(left == right)` left: `12`, right: `16`: Size of: _xmlNodeSet', src/bindings.rs:17021:3 ---- bindings::bindgen_test_layout__xmlNotation stdout ---- thread 'bindings::bindgen_test_layout__xmlNotation' panicked at 'assertion failed: `(left == right)` left: `12`, right: `24`: Size of: _xmlNotation', src/bindings.rs:2075:3 ---- bindings::bindgen_test_layout__xmlElementContent stdout ---- thread 'bindings::bindgen_test_layout__xmlElementContent' panicked at 'assertion failed: `(left == right)` left: `28`, right: `48`: Size of: _xmlElementContent', src/bindings.rs:2415:3 ---- bindings::bindgen_test_layout__xmlParserCtxt stdout ---- thread 'bindings::bindgen_test_layout__xmlParserCtxt' panicked at 'assertion failed: `(left == right)` left: `472`, right: `752`: Size of: _xmlParserCtxt', src/bindings.rs:7749:3 ---- bindings::bindgen_test_layout__xmlOutputBuffer stdout ---- thread 'bindings::bindgen_test_layout__xmlOutputBuffer' panicked at 'assertion failed: `(left == right)` left: `32`, right: `56`: Size of: _xmlOutputBuffer', src/bindings.rs:14895:3 ---- bindings::bindgen_test_layout__xmlParserInput stdout ---- thread 'bindings::bindgen_test_layout__xmlParserInput' panicked at 'assertion failed: `(left == right)` left: `60`, right: `104`: Size of: _xmlParserInput', src/bindings.rs:7319:3 ---- bindings::bindgen_test_layout__xmlNs stdout ---- thread 'bindings::bindgen_test_layout__xmlNs' panicked at 'assertion failed: `(left == right)` left: `24`, right: `48`: Size of: _xmlNs', src/bindings.rs:2982:3 ---- bindings::bindgen_test_layout__xmlParserInputBuffer stdout ---- thread 'bindings::bindgen_test_layout__xmlParserInputBuffer' panicked at 'assertion failed: `(left == right)` left: `36`, right: `64`: Size of: _xmlParserInputBuffer', src/bindings.rs:14780:3 ---- bindings::bindgen_test_layout__xmlParserNodeInfoSeq stdout ---- thread 'bindings::bindgen_test_layout__xmlParserNodeInfoSeq' panicked at 'assertion failed: `(left == right)` left: `12`, right: `24`: Size of: _xmlParserNodeInfoSeq', src/bindings.rs:7570:3 ---- bindings::bindgen_test_layout__xmlParserNodeInfo stdout ---- thread 'bindings::bindgen_test_layout__xmlParserNodeInfo' panicked at 'assertion failed: `(left == right)` left: `20`, right: `40`: Size of: _xmlParserNodeInfo', src/bindings.rs:7498:3 ---- bindings::bindgen_test_layout__xmlRef stdout ---- thread 'bindings::bindgen_test_layout__xmlRef' panicked at 'assertion failed: `(left == right)` left: `20`, right: `40`: Size of: _xmlRef', src/bindings.rs:3510:3 ---- bindings::bindgen_test_layout__xmlSAXLocator stdout ---- thread 'bindings::bindgen_test_layout__xmlSAXLocator' panicked at 'assertion failed: `(left == right)` left: `16`, right: `32`: Size of: _xmlSAXLocator', src/bindings.rs:8669:3 ---- bindings::bindgen_test_layout__xmlSAXHandlerV1 stdout ---- thread 'bindings::bindgen_test_layout__xmlSAXHandlerV1' panicked at 'assertion failed: `(left == right)` left: `112`, right: `224`: Size of: _xmlSAXHandlerV1', src/bindings.rs:9512:3 ---- bindings::bindgen_test_layout__xmlSchemaAttributeGroup stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaAttributeGroup' panicked at 'assertion failed: `(left == right)` left: `60`, right: `120`: Size of: _xmlSchemaAttributeGroup', src/bindings.rs:19863:3 ---- bindings::bindgen_test_layout__xmlSchemaAttributeLink stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaAttributeLink' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlSchemaAttributeLink', src/bindings.rs:19620:3 ---- bindings::bindgen_test_layout__xmlSchema stdout ---- thread 'bindings::bindgen_test_layout__xmlSchema' panicked at 'assertion failed: `(left == right)` left: `84`, right: `160`: Size of: _xmlSchema', src/bindings.rs:21003:3 ---- bindings::bindgen_test_layout__xmlSchemaElement stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaElement' panicked at 'assertion failed: `(left == right)` left: `104`, right: `200`: Size of: _xmlSchemaElement', src/bindings.rs:20499:3 ---- bindings::bindgen_test_layout__xmlSAXHandler stdout ---- thread 'bindings::bindgen_test_layout__xmlSAXHandler' panicked at 'assertion failed: `(left == right)` left: `128`, right: `256`: Size of: _xmlSAXHandler', src/bindings.rs:9143:3 ---- bindings::bindgen_test_layout__xmlSchemaFacet stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaFacet' panicked at 'assertion failed: `(left == right)` left: `40`, right: `72`: Size of: _xmlSchemaFacet', src/bindings.rs:20787:3 ---- bindings::bindgen_test_layout__xmlSchemaFacetLink stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaFacetLink' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlSchemaFacetLink', src/bindings.rs:20084:3 ---- bindings::bindgen_test_layout__xmlSchemaAnnot stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaAnnot' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlSchemaAnnot', src/bindings.rs:19346:3 ---- bindings::bindgen_test_layout__xmlSchemaType stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaType' panicked at 'assertion failed: `(left == right)` left: `120`, right: `224`: Size of: _xmlSchemaType', src/bindings.rs:20154:3 ---- bindings::bindgen_test_layout__xmlSchemaNotation stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaNotation' panicked at 'assertion failed: `(left == right)` left: `20`, right: `40`: Size of: _xmlSchemaNotation', src/bindings.rs:20912:3 ---- bindings::bindgen_test_layout__xmlSchemaAttribute stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaAttribute' panicked at 'assertion failed: `(left == right)` left: `76`, right: `152`: Size of: _xmlSchemaAttribute', src/bindings.rs:19406:3 ---- bindings::bindgen_test_layout__xmlSchemaWildcard stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaWildcard' panicked at 'assertion failed: `(left == right)` left: `44`, right: `72`: Size of: _xmlSchemaWildcard', src/bindings.rs:19715:3 ---- bindings::bindgen_test_layout__xmlSchemaWildcardNs stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaWildcardNs' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlSchemaWildcardNs', src/bindings.rs:19663:3 ---- bindings::bindgen_test_layout__xmlShellCtxt stdout ---- thread 'bindings::bindgen_test_layout__xmlShellCtxt' panicked at 'assertion failed: `(left == right)` left: `28`, right: `56`: Size of: _xmlShellCtxt', src/bindings.rs:18498:3 ---- bindings::bindgen_test_layout__xmlURI stdout ---- thread 'bindings::bindgen_test_layout__xmlURI' panicked at 'assertion failed: `(left == right)` left: `44`, right: `88`: Size of: _xmlURI', src/bindings.rs:21381:3 ---- bindings::bindgen_test_layout__xmlValidCtxt stdout ---- thread 'bindings::bindgen_test_layout__xmlValidCtxt' panicked at 'assertion failed: `(left == right)` left: `64`, right: `112`: Size of: _xmlValidCtxt', src/bindings.rs:6449:3 ---- bindings::bindgen_test_layout__xmlXPathAxis stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathAxis' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlXPathAxis', src/bindings.rs:17358:3 ---- bindings::bindgen_test_layout__xmlXPathContext stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathContext' panicked at 'assertion failed: `(left == right)` left: `204`, right: `352`: Size of: _xmlXPathContext', src/bindings.rs:17490:3 ---- bindings::bindgen_test_layout__xmlXPathObject stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathObject' panicked at 'assertion failed: `(left == right)` left: `40`, right: `72`: Size of: _xmlXPathObject', src/bindings.rs:17090:3 ---- bindings::bindgen_test_layout__xmlXPathParserContext stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathParserContext' panicked at 'assertion failed: `(left == right)` left: `48`, right: `88`: Size of: _xmlXPathParserContext', src/bindings.rs:17924:3 ---- bindings::bindgen_test_layout__xmlXPathType stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathType' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlXPathType', src/bindings.rs:17215:3 ---- bindings::bindgen_test_layout__xmlXPathVariable stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathVariable' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlXPathVariable', src/bindings.rs:17256:3 ---- bindings::bindgen_test_layout_drand48_data stdout ---- thread 'bindings::bindgen_test_layout_drand48_data' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of drand48_data', src/bindings.rs:12849:3 ---- bindings::bindgen_test_layout_fd_set stdout ---- thread 'bindings::bindgen_test_layout_fd_set' panicked at 'assertion failed: `(left == right)` left: `64`, right: `128`: Size of: fd_set', src/bindings.rs:11646:3 ---- bindings::bindgen_test_layout_ldiv_t stdout ---- thread 'bindings::bindgen_test_layout_ldiv_t' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: ldiv_t', src/bindings.rs:11348:3 ---- bindings::bindgen_test_layout_lldiv_t stdout ---- thread 'bindings::bindgen_test_layout_lldiv_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of lldiv_t', src/bindings.rs:11392:3 ---- bindings::bindgen_test_layout_pthread_attr_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_attr_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_attr_t', src/bindings.rs:12364:3 ---- bindings::bindgen_test_layout_pthread_barrier_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_barrier_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_barrier_t', src/bindings.rs:12598:3 ---- bindings::bindgen_test_layout_pthread_cond_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_cond_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_cond_t', src/bindings.rs:12456:3 ---- bindings::bindgen_test_layout_pthread_mutex_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_mutex_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_mutex_t', src/bindings.rs:12405:3 ---- bindings::bindgen_test_layout_pthread_rwlock_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_rwlock_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_rwlock_t', src/bindings.rs:12507:3 ---- bindings::bindgen_test_layout__xmlXPathFunct stdout ---- thread 'bindings::bindgen_test_layout__xmlXPathFunct' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlXPathFunct', src/bindings.rs:17305:3 ---- bindings::bindgen_test_layout_pthread_rwlockattr_t stdout ---- thread 'bindings::bindgen_test_layout_pthread_rwlockattr_t' panicked at 'assertion failed: `(left == right)` left: `4`, right: `8`: Alignment of pthread_rwlockattr_t', src/bindings.rs:12557:3 ---- bindings::bindgen_test_layout_timespec stdout ---- thread 'bindings::bindgen_test_layout_timespec' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: timespec', src/bindings.rs:11606:3 ---- bindings::bindgen_test_layout_random_data stdout ---- thread 'bindings::bindgen_test_layout_random_data' panicked at 'assertion failed: `(left == right)` left: `28`, right: `48`: Size of: random_data', src/bindings.rs:12693:3 ---- bindings::bindgen_test_layout__xmlSchemaTypeLink stdout ---- thread 'bindings::bindgen_test_layout__xmlSchemaTypeLink' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: _xmlSchemaTypeLink', src/bindings.rs:20041:3 ---- bindings::bindgen_test_layout_timeval stdout ---- thread 'bindings::bindgen_test_layout_timeval' panicked at 'assertion failed: `(left == right)` left: `8`, right: `16`: Size of: timeval', src/bindings.rs:11567:3 failures: bindings::bindgen_test_layout_UConverterFromUnicodeArgs bindings::bindgen_test_layout_UConverterToUnicodeArgs bindings::bindgen_test_layout__G_fpos64_t bindings::bindgen_test_layout__G_fpos_t bindings::bindgen_test_layout__IO_FILE bindings::bindgen_test_layout__IO_marker bindings::bindgen_test_layout___pthread_cond_s bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_1 bindings::bindgen_test_layout___pthread_cond_s__bindgen_ty_2 bindings::bindgen_test_layout___pthread_internal_list bindings::bindgen_test_layout___pthread_mutex_s bindings::bindgen_test_layout___pthread_rwlock_arch_t bindings::bindgen_test_layout___sigset_t bindings::bindgen_test_layout___va_list_tag bindings::bindgen_test_layout__htmlElemDesc bindings::bindgen_test_layout__htmlEntityDesc bindings::bindgen_test_layout__uconv_t bindings::bindgen_test_layout__xlinkHandler bindings::bindgen_test_layout__xmlAttr bindings::bindgen_test_layout__xmlAttribute bindings::bindgen_test_layout__xmlBuffer bindings::bindgen_test_layout__xmlChRangeGroup bindings::bindgen_test_layout__xmlCharEncodingHandler bindings::bindgen_test_layout__xmlDOMWrapCtxt bindings::bindgen_test_layout__xmlDoc bindings::bindgen_test_layout__xmlDtd bindings::bindgen_test_layout__xmlElement bindings::bindgen_test_layout__xmlElementContent bindings::bindgen_test_layout__xmlEntity bindings::bindgen_test_layout__xmlEnumeration bindings::bindgen_test_layout__xmlError bindings::bindgen_test_layout__xmlGlobalState bindings::bindgen_test_layout__xmlID bindings::bindgen_test_layout__xmlLocationSet bindings::bindgen_test_layout__xmlNode bindings::bindgen_test_layout__xmlNodeSet bindings::bindgen_test_layout__xmlNotation bindings::bindgen_test_layout__xmlNs bindings::bindgen_test_layout__xmlOutputBuffer bindings::bindgen_test_layout__xmlParserCtxt bindings::bindgen_test_layout__xmlParserInput bindings::bindgen_test_layout__xmlParserInputBuffer bindings::bindgen_test_layout__xmlParserNodeInfo bindings::bindgen_test_layout__xmlParserNodeInfoSeq bindings::bindgen_test_layout__xmlRef bindings::bindgen_test_layout__xmlSAXHandler bindings::bindgen_test_layout__xmlSAXHandlerV1 bindings::bindgen_test_layout__xmlSAXLocator bindings::bindgen_test_layout__xmlSchema bindings::bindgen_test_layout__xmlSchemaAnnot bindings::bindgen_test_layout__xmlSchemaAttribute bindings::bindgen_test_layout__xmlSchemaAttributeGroup bindings::bindgen_test_layout__xmlSchemaAttributeLink bindings::bindgen_test_layout__xmlSchemaElement bindings::bindgen_test_layout__xmlSchemaFacet bindings::bindgen_test_layout__xmlSchemaFacetLink bindings::bindgen_test_layout__xmlSchemaNotation bindings::bindgen_test_layout__xmlSchemaType bindings::bindgen_test_layout__xmlSchemaTypeLink bindings::bindgen_test_layout__xmlSchemaWildcard bindings::bindgen_test_layout__xmlSchemaWildcardNs bindings::bindgen_test_layout__xmlShellCtxt bindings::bindgen_test_layout__xmlURI bindings::bindgen_test_layout__xmlValidCtxt bindings::bindgen_test_layout__xmlXPathAxis bindings::bindgen_test_layout__xmlXPathContext bindings::bindgen_test_layout__xmlXPathFunct bindings::bindgen_test_layout__xmlXPathObject bindings::bindgen_test_layout__xmlXPathParserContext bindings::bindgen_test_layout__xmlXPathType bindings::bindgen_test_layout__xmlXPathVariable bindings::bindgen_test_layout_drand48_data bindings::bindgen_test_layout_fd_set bindings::bindgen_test_layout_ldiv_t bindings::bindgen_test_layout_lldiv_t bindings::bindgen_test_layout_pthread_attr_t bindings::bindgen_test_layout_pthread_barrier_t bindings::bindgen_test_layout_pthread_cond_t bindings::bindgen_test_layout_pthread_mutex_t bindings::bindgen_test_layout_pthread_rwlock_t bindings::bindgen_test_layout_pthread_rwlockattr_t bindings::bindgen_test_layout_random_data bindings::bindgen_test_layout_timespec bindings::bindgen_test_layout_timeval test result: FAILED. 12 passed; 84 failed; 0 ignored; 0 measured; 0 filtered out ```

Noticed that when runnning cargo test on i686 and armv7hl.

[dginev]

Thanks for the report!

Do you have any pointer to how to emulate a 32bit target in a cargo test suite? Would love to figure out some way to troubleshoot locally and land some patches. Open to pull requests too if this looks easy to patch on your end.

[ignatenkobrain]

@dginev not really sure, but libc crate is doing such tests so probably worth to look at?

I guess by specifying --target i686-unknown-linux-gnu when running cargo test

[ignatenkobrain]

@dginev I guess this is because you have generated bindings using bindgen just on your computer so things like https://github.com/KWARC/rust-libxml/blob/master/src/bindings.rs#L16-L20 just get hardcoded there, together with other things.

Proper solution would be to use bindgen from build.rs to have it generated dynamically.

[dginev]

That's a good tip! Sadly, I think I'll need to make a VM after all, since I also need the native libxml2.so library to stay compatible. Thanks in any case!

[dginev]

Ah, having to run bindgen on every build would likely be a good solution. Seems like a lot of wasted work if you stick to the same platform, but definitely makes sense for the 32-bit case. Will take a look into that...

[ignatenkobrain]

@dginev well, it is not only about 32bit case, but also about libxml2 version (the bindings which are generated are derived for some specific libxml2 version, so let's say if I try to use those constants in my code, they will report wrong information).

Oh yeah, we also have another beast - s390x which is BigEndian, that can also behave for some things differently :)

Let me know once you have some patch which uses bindgen dynamically or some other fix and I can try it out.

[dginev]

Started investigating and quickly ran into the full list of painpoints that has seemingly been discussed online before: https://www.reddit.com/r/rust/comments/5x5em7/pain_points_using_rustbindgen_at_buildtime/

It seems that the reasonable way out of the heavy bindgen dependency burden is to

"ship several pregenerated bindings and pick the right one at build time"

So I'll likely have to get a VM with your setup, generate an alternative src/bindings.rs and put in place a mechanism for fishing out the right one at build time -- and giving a clean error on platforms the wrapper wasn't prepared for. Ugh.

The good news is that libxml2 itself is a slow velocity project due to its maturity, so regenerating the bindings file on breakage is a reasonable tradeoff. Might be years until that is needed. My long-term hope for the crate is to bundle in a Rust-transpiled equivalent of libxml2 (in development by c2rust), and entirely escape the C dependency games.

Will read more in that reddit thread, and let you know when I have the build mechanism. If you feel like running bindgen as specified in the PR #74 , and share the resulting file with me, that would speed me along nicely.

[ignatenkobrain]

libxml.aarch64.txt libxml.armv7hl.txt libxml.i686.txt libxml.ppc64le.txt libxml.s390x.txt libxml.x86_64.txt

[ignatenkobrain]

@dginev any news here? This is blocking me from getting https://gitlab.com/news-flash/news_flash_gtk from being packaged.

[ghost]

Maybe we need to remove unnecessary assert.

I've generated bindings.rs on Manjaro, tested on Windows10, and found out that c_ulong's size or c_long's is different from Win. So I removed the corresponding assert. It's worked so far.

Similarly, we need to remove the pointer's size assert for 32-bit .

[dginev]

As suggested by @simoin , I've dropped a few troublesome asserts in #78 , wouldn't call them "unnecessary", but definitely difficult to maintain for multiple architectures... I've done so only to the extent where the Appveyor CI can successfully pass tests on Windows, and just released a 0.2.15 minor version that anchors that.

So, if anyone wants to revisit here and file a better PR than my half-hearted #76, they should feel welcome.

[decathorpe]

I wonder, are the bindings themselves actually different between the different architectures, or is it just the tests (which hard-code architecture specific expected struct sizes and struct layout / field offsets)?

If the bindings themselves are architecture-independent but the generated bindgen tests hard-code information that depends on the host system, then the easiest solution would probably be to just wrap the tests in #[cfg(target_arch = $host_arch) (and I'm assuming that the host architecture is x86_64 here).