<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/72771>72771</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            How to build libunwind for wasm? 
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          trcrsired
      </td>
    </tr>
</table>

<pre>
    error: "Unsupported architecture."

`[14/16] Building CXX object src/CMakeFiles/unwind_static_objects.dir/libunwind.cpp.obj
FAILED: src/CMakeFiles/unwind_static_objects.dir/libunwind.cpp.obj
/home/cqwrteur/llvm_toolchains/x86_64-pc-linux-gnu/bin/clang++ --target=wasm32-wasi --sysroot=/home/cqwrteur/toolchains/sysroots/wasm32-wasi/wasm32-wasi -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBUNWIND_IS_BAREMETAL -I/home/cqwrteur/projects/llvm-project/libunwind/include -Wno-array-bounds -Wno-cast-function-type -Wno-uninitialized -fuse-ld=lld -Wno-misleading-indentation -Wno-global-constructors -Wno-unused-command-line-argument -O3 -DNDEBUG -std=c++11 -Werror=return-type -funwind-tables -nostdinc++ -D_DEBUG -UNDEBUG -D_LIBUNWIND_IS_NATIVE_ONLY -Wall -Wextra -Wnewline-eof -Wshadow -Wwrite-strings -Wno-unused-parameter -Wno-long-long -Werror=return-type -Wextra-semi -Wundef -Wunused-template -Wformat-nonliteral -Wno-user-defined-literals -Wno-covered-switch-default -Wno-suggest-override -Wno-error -pedantic -fno-rtti  -fstrict-aliasing -fno-exceptions -fno-rtti -MD -MT src/CMakeFiles/unwind_static_objects.dir/libunwind.cpp.obj -MF src/CMakeFiles/unwind_static_objects.dir/libunwind.cpp.obj.d -o src/CMakeFiles/unwind_static_objects.dir/libunwind.cpp.obj -c /home/cqwrteur/projects/llvm-project/libunwind/src/libunwind.cpp
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/libunwind.cpp:12:
In file included from /home/cqwrteur/projects/llvm-project/libunwind/include/libunwind.h:16:
/home/cqwrteur/projects/llvm-project/libunwind/include/__libunwind_config.h:184:4: error: "Unsupported architecture."
  184 | #  error "Unsupported architecture."
      |    ^
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/libunwind.cpp:12:
/home/cqwrteur/projects/llvm-project/libunwind/include/libunwind.h:71:17: error: use of undeclared identifier '_LIBUNWIND_CONTEXT_SIZE'
   71 | uint64_t data[_LIBUNWIND_CONTEXT_SIZE];
      | ^
/home/cqwrteur/projects/llvm-project/libunwind/include/libunwind.h:76:17: error: use of undeclared identifier '_LIBUNWIND_CURSOR_SIZE'
   76 | uint64_t data[_LIBUNWIND_CURSOR_SIZE];
      |                 ^
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/libunwind.cpp:30:
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/AddressSpace.hpp:23:
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/EHHeaderParser.hpp:17:
/home/cqwrteur/projects/llvm-project/libunwind/src/DwarfParser.hpp:69:26: error: use of undeclared identifier '_LIBUNWIND_HIGHEST_DWARF_REGISTER'
 69 |     kMaxRegisterNumber = _LIBUNWIND_HIGHEST_DWARF_REGISTER
      | ^
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/libunwind.cpp:31:
In file included from /home/cqwrteur/projects/llvm-project/libunwind/src/UnwindCursor.hpp:50:
/home/cqwrteur/projects/llvm-project/libunwind/src/RWMutex.hpp:19:10: fatal error: 'pthread.h' file not found
   19 | #include <pthread.h>
 |          ^~~~~~~~~~~
5 errors generated.
ninja: build stopped: subcommand failed.`
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEV11z4joS_TXiRSXKH2DCAw8QmwlVA5kCsszdF5cstY3mCskryZfMPuxv35JtmDB3pu7uJpl1VXBsdZ_T3afdtqi1olIAMzReoHE6oI07ajNzhhkrDPBBofnXGRijDYrnGEXRk7JNXWvjgGNq2FE4YK4xMERRhIIUBfP-NwnQeBGOULQMEzRO8aIRkgtV4fvPn7EuvgBz2BqGouX9mv4OSyHBomjZqLNQPLeOOsHyzs4OuTAoWkpRdMtDVtdDXXzpqJbz1ccs9fG9DR6Klkd9AhQt2T_OxkHT2so_TrnTWrIjFcojP98leTIiNSNSqOaZVKpB0bIQyjtKqioULVC0wIQ4aipwKE7P1J7iiJypFZgQ-9Uarf39HzLekPW2_t8XILdXmKT5x9Xi_tOn_GG-yzeP-aft_MN6nu9-2-2zdf6QzdNs21s9bQ6rTZqvdvlivs3W2X7-EZPVDwOpjW6r1leB9NcvC4iipVBMNhwwOShNqDH0Kyl0o7jt7jBqHSkbxZzQirivdW_ZKKGEE1SKfwLHpGwsEMlRnErJO4uTsBKobx0iFAflldSqW6ukLqgkTCvrTMOcNvYC21jghOnTiSruFQJCTdWcQDlMHmNM0k2aLZ4-YGKdp2OdWmGIyaHv99SAa8wl2LLLlDhaSLCYKG0dF4pdVE7zHu_pAvxdnTfz_epvWf64-fgbJgcqpWd6dob6iOHchgi6xORgj5TrMyaHsxEOiHVGqOo2sZoaegIHprsrtaran59F3zERCyeByaFRHMr23II5ONWSOm9WanOijiitpHBgqOxZLRjCoRQKfDHblYuw-g8wwIk9C8eO3og20nVrtqkqsI54EyMuzdEGiEkNnConGCal0sQ4JzAmpU-WOUKloNZPi3YRnhnUXnX7wpisU0zW-1c_9Jisl68GGXJM9BuEwvArHsGO_ga1m2grhUshAffPKMel0ae3ZornYYTi-Tsx9kA3rEfPmVw53wQ9z6_3c6ZVKaqO5m6E4rn_w__d2xDj8G6E0eQeoyjGnfN_6ukP7-lP4-z_JeU7iDYJPcXkppqNBaxL7EcTk9QAx8IPe1EK8AWbvBim94-bffZ5n-9Wf89QNLmWaxK25WqEcskod5hTR9F48TPPcYrixfe1vhb6PdJOXpf203b3uP1z1slfZv3C8YdJf3_86m6Lg_cbHB3jnHMD1u5qymB4bEmj-L1Js4cHoBzMJ2osmJ621f_VLdYRpGdqyhv0ZOozS_7XFntYfXjIdvs8Pcy3y3ybfVjt9tn2W7cl02u__L6mz1uohHVgNs2p8Fhxiv8a7GcP3K_qtfC9ZX9qL-8bY_VFlnHwdqJvD-vGwfOlnbzgoYfHJXVUvnw9TWp3NED98IkmXapKO1z6z_KrDOH08na6fMGj-P6bY9yrczsn0Dj71_XoDMYds8UVKDDUAR92C0qoL9QHVPgdILZO1zXwdrvWFP0HOi6pkN4jCQZ8FvNpPKUDmIWTIIiTOBzdDY4zWkyno4BS4DSibFJOpknCaRJN70acl3d0IGZREMVhGE6DOBiP7oYsoHFR0phNWAQ0YGgUwIkKOfQ1HmpTDYS1Dcwm0WQSDiQtQNp2JxxFCs64XfSv43E6MLNWl6KpLBoFUlhnv6E44STMHvQZO91neZUNl9pgv0lD8RIPGiNnR-dq69shWqJoWQl3bIoh06de-z-3QBuHb402zn8HAAD__5ZCL5k">