<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/57733>57733</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
libunwind does not build on 32-bit x86 anymore: error: dlfo_eh_dbase is not supported for D WARF-based unwinding
</td>
</tr>
<tr>
<th>Labels</th>
<td>
libunwind,
regression
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
mgorny
</td>
</tr>
</table>
<pre>
When attempting to build libunwind as part of runtimes for 32-bit multilib on x86, I get the following error:
```
FAILED: libunwind/src/CMakeFiles/unwind_shared_objects.dir/libunwind.cpp.o
/usr/lib/ccache/bin/i686-pc-linux-gnu-clang++ --target=i686-pc-linux-gnu -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LIBUNWIND_LINK_DL_LIB -D_LIBUNWIND_LINK_PTHREAD_LIB -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/include -march=znver2 -O2 -pipe -frecord-gcc-switches -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fPIC -Werror=return-type -W -Wall -Wchar-subscripts -Wconversion -Wmismatched-tags -Wmissing-braces -Wnewline-eof -Wno-unused-function -Wshadow -Wshorten-64-to-32 -Wsign-compare -Wsign-conversion -Wstrict-aliasing=2 -Wstrict-overflow=4 -Wunused-parameter -Wunused-variable -Wwrite-strings -Wundef -Wno-suggest-override -Wno-error -pedantic -funwind-tables -nostdinc++ -fno-rtti -std=c++11 -fstrict-aliasing -fno-exceptions -fno-rtti -MD -MT libunwind/src/CMakeFiles/unwind_shared_objects.dir/libunwind.cpp.o -MF libunwind/src/CMakeFiles/unwind_shared_objects.dir/libunwind.cpp.o.d -o libunwind/src/CMakeFiles/unwind_shared_objects.dir/libunwind.cpp.o -c /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp:30:
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/AddressSpace.hpp:23:
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/EHHeaderParser.hpp:17:
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/DwarfParser.hpp:22:
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/Registers.hpp:1549:54: warning: unused parameter 'regNum' [-Wunused-parameter]
inline bool Registers_ppc64::validVectorRegister(int regNum) const {
^
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/Registers.hpp:2871:5: warning: '__mips_isa_rev' is not defined, evaluates to 0 [-Wundef]
#if __mips_isa_rev != 6
^
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/Registers.hpp:3195:5: warning: '__mips_isa_rev' is not defined, evaluates to 0 [-Wundef]
#if __mips_isa_rev != 6
^
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp:30:
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/AddressSpace.hpp:590:2: error: dlfo_eh_dbase is not supported for DWARF-based unwinding
#error dlfo_eh_dbase is not supported for DWARF-based unwinding
^
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp:31:
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/UnwindCursor.hpp:44:
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/DwarfInstructions.hpp:323:29: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'pint_t' (aka 'unsigned int') [-Wshorten-64-to-32]
r2 = addressSpace.get64(sp + PPC64_ELFV1_R2_OFFSET);
~ ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/UnwindCursor.hpp:1003:37: note: in instantiation of member function 'libunwind::DwarfInstructions<libunwind::LocalAddressSpace, libunwind::Registers_x86>::stepWithDwarf' requested here
return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace,
^
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/UnwindCursor.hpp:2820:20: note: in instantiation of member function 'libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86>::stepWithDwarfFDE' requested here
result = this->stepWithDwarfFDE();
^
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/UnwindCursor.hpp:919:23: note: in instantiation of member function 'libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86>::step' requested here
UnwindCursor(unw_context_t *context, A &as);
^
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp:85:7: note: in instantiation of member function 'libunwind::UnwindCursor<libunwind::LocalAddressSpace, libunwind::Registers_x86>::UnwindCursor' requested here
UnwindCursor<LocalAddressSpace, REGISTER_KIND>(
^
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/libunwind.cpp:31:
In file included from /tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/UnwindCursor.hpp:44:
/tmp/portage/sys-libs/llvm-libunwind-16.0.0.9999/work/libunwind/src/DwarfInstructions.hpp:326:29: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'pint_t' (aka 'unsigned int') [-Wshorten-64-to-32]
r2 = addressSpace.get64(sp + PPC64_ELFV2_R2_OFFSET);
~ ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 warnings and 1 error generated.
```
Full build log: [sys-libs:llvm-libunwind-16.0.0.9999:20220914-064512.log](https://github.com/llvm/llvm-project/files/9563495/sys-libs.llvm-libunwind-16.0.0.9999.20220914-064512.log)
It seems to have been broken by df9a23e2feda18f0308b6d4dbd591ebe6b605aa4 (CC @vogelsgesang). The prior commit builds successfully and passes all tests.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJztWVlz4kgS_jX4paIIJCEBDzxgjmlifHRg9_hRUVKVRG1LKk1VCdvz6ydTB2Cb7u3Z9tEbuyB01JXHl5mViSLFH6d3W1EQZq3ISyuLlFhFokpmnGQyqop7WXDCDCmZtkQlRFeFlbkwJFGaeC6NpCV5lVkJo4kqyMM46LlzsiapsMRuBYzLMnWPCwutle55s95g0Rt052DQHvXjara-WC5gzIF4z10ZHcN5fsm-ipXMhIGHpi80W6YFD1X0LxFb0-dSQ99-aj8uy74iLSWYZNpuOMcxi7cCbiJZwFkG44CWMc1kUT3QtKhonLEi7bnncBBKLdMgUM9bvBhI6CJcAdfh9Wp1s7wNz9e3NzAuGGLHxWzz27Luvbn-spkv67b1-Zeru_UV3l39Hi4usOVEx-fbT5vlbNH1hje3i3k4v766uZ1d3YaXs_nm-ubQsbreXM5eNl-sL9eH1jVIavMSzqXSlqUov3k0IEyESs2yXU732qNO0B_AdwIf6LxX-uuxclFpRZxVXBBCc6bjLUj9V7ET2iX0Gn6lLAWhiRax0pymcUzNvbSgdAOtO2lkBDZjH6ksQJfC0K3kHCyR3rV2suDMCorGdtRWFWnFNBecsh2TGWvXKMQ9DGJZhkMfrGZwLRStisrAULBdlgsrNLTeawmrGqvBIoGRu5gZS_-sGM7MpTHQTBMpMg58SStZJv8SGgfKvMxkLC1NgIzdalWlW5yvQGKg0chGuUgYeENDvlDiIRalpfYRVQFNBd1JbYEa5VYhO1xkwBg90WOqNBXAG66vJW_m01jluShw_UYEaECVG6mKRoBMMI7tgBCMY7bpiC3jANJjJEAnpioRfsEBBy5ZWihjZWxgqQwpJ0lVxDiPGlFfES_Agh0_f17Pj1DRwla66MTcIxGDd1JTRSbWsrS1tp9xmzM0CA7uVYPRARBpFqOZ3AGuaBxUQOQ5RrRjEfWwZVzd1zcoVEGDIbWKei42ybRAlYEBiMPjEQuoxNhSQJkhYRDFPbSi5hOIXdAKznx3wpjaph3TkkWZOGFeFcDQsn4a0FqF4CyCMwisMUHRau-zuCIsgegAonEXihKYpK2VBKhwYK3tcBxww-SZPM3oxghb4PazLxfwu33NOEsvV6-4XB_MU70qezF53fDX8POETLPVrAuSAIOkjY-cJFrl70Dcm3mD_f76fkzMONfCmJsSnLa_rflwvQ_gY_npEwQ_oT8zbYRuOXFGH8DJ4p7p5AkbrntIfN6A4Eak0kBMMp3U_nACF3-IqRQwU9TBbUaagEUOMaznjrRIr6ocbkjPP38Z5nr-ouG72adJpFRG9vTCsowDpALHDsIO_wM8UOmuv-eOJexWHYkJgehrLOmNzps1yX_y6fnL99OkOx45qMlnigR1hWEuSxNKw0Itdqg_aUihLIGID4rimAYL0EkFaYzBrHrQKRgG7LXacz2ZkKdrwepAc0GCg5LeVWbPmfi_ksy_RDx9p8jpT5AkRot9vUR4lqhQbEMeMSM6jR-yOKzEFnezzYpiPycNEQSt03aTZPzcMr8EHM4HBPMv9eO80kZ10Xw4fFOzqLePNQRKXTUJd-eX9bbqTp75ZVeZkKPUNlMGHBBir0ghypdQhElsb924go5gGNo66Ltj9pXVrQUmyKDKTEHqiCdoxKANfgx3JUz65hToawfX_v48F9-7_iGKQ5mI_s6OXQBKbNhM3LEpCea6nz_PgcvlxeoPJ9y4bYHdQ_lPbR-90RJ_P3T4PzbsZ443s44T9ugMBmgZHuY66NWiNosCDmOxrGjKQKihcpFHYA_78gkwOxCoN_EXttfz5s-GXKiYZcehC6P-szGHBAH_EPKWTSu0lHfSbmsiaEla_FlBTQQGtIUq-gBqU1CSU8zMkNrmW0uOQ_aUsR_PM950iz0Bmjt261A_-HnQjld_M7xWi-X3ITP4xwf6tN1KQ2GRl9PH3_Tej8Fg4ky6auUXhuB7an_5ecKJOwYSIWwMVjxA9AbGZ-0DcoCbQcDMvwHlrXF5vsuPMfF8hVD2VpA8VfD3oHnGwUmSm-Vv65vb5Sb8fX21QBrgJEdL_D_r-visK_gfzbrc_9Ksy-9wMoQVnDhNJUVSUQgNhSnvn3z31L6BqrKse_-lmrLXP9_bljf7jm3hXu66g4kzpINg6DtuH1cADNzx1toSZ4OZwZHCnlhF_VjlrbF2Nltqhf9gwmPS_sE58QNvCNX4wb773-agf4o-AHck3hoqPiHyujbfsp0gkRAFibT6ipdHwpMJg3rRTQRnzjgZeINxFPAhj7g_cUQkgigY-IwN0Rrnc9IbDnYqFZlJhalfl0365HYrwPQlKBxfVoCD1No0UGnGMdhcAgp-rHEpmUF3wXcFFuKn6Z-JqRMEnuONveHwjE89PvEm7MxKm4np4W0kV6KpXRuYwO_a95AQpGHhx1xp8Y_rZ3Kq8j2rdDb9x9hJY6oaPH808ryz7dQbD9lk4ieOGDHfY07gCRaNfZczn4uRE59lLAIdTsHSeq57FJlc3CDgokWK7oqhxEWvPpPTDupB4LvusB_Eych3x7ET82TEHReAETmTWW0tfaXTMz2t2Yyq1EBnJlHh-05AAiOKqFmA9VllIZZM81Tp4vGsFmhaS_M3s6eicg">