<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64879>64879</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc] Full libc build failure on an aarch64 host with linux using clang-16
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

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

<pre>
    Hi, I am trying to build full libc on an aarch64 host running Linux using clang-16. Following [documentation](https://libc.llvm.org/full_host_build.html) for building full libc on a host, I am using this commands to configure & install:
```bash
SYSROOT=/home/user/full_libc_install; 
cmake ../llvm  \
   -G Ninja  \ # Generator
 -DLLVM_ENABLE_PROJECTS="clang;libc;lld;compiler-rt"   \ # Enabled projects
   -DCMAKE_BUILD_TYPE=Debug  \ # Select build type
 -DCMAKE_C_COMPILER=clang-16 -DCMAKE_CXX_COMPILER=clang++-16 \
 -DLLVM_LIBC_FULL_BUILD=ON      \  # We want the full libc
 -DLLVM_LIBC_INCLUDE_SCUDO=ON   \  # Include Scudo in the libc
 -DCOMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC=ON \
 -DCOMPILER_RT_BUILD_GWP_ASAN=OFF                       \
 -DCOMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED=OFF        \
 -DCMAKE_INSTALL_PREFIX=$SYSROOT #
ninja install-clang install-builtins install-compiler-rt  \
   install-core-resource-headers install-libc install-lld
```
However, the installation phase fails at the stage of installing compiler-rt with the following error:
```console
FAILED: projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-aarch64.dir/linux.cpp.o 
/usr/bin/clang++-16 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D_LIBCPP_ENABLE_HARDENED_MODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/user/llvm-project/build_clean_full-libc_clang16-by-clang16/projects/compiler-rt/lib/scudo/standalone -I/home/user/llvm-project/compiler-rt/lib/scudo/standalone -I/home/user/llvm-project/build_clean_full-libc_clang16-by-clang16/include -I/home/user/llvm-project/llvm/include -I/home/user/llvm-project/compiler-rt/lib/scudo/standalone/../.. -I/home/user/llvm-project/compiler-rt/lib/scudo/standalone/include -I/home/user/llvm-project/build_clean_full-libc_clang16-by-clang16/projects/compiler-rt/../libc/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -Wall -Wno-unused-parameter -g -march=armv8-a -fno-lto -Werror=conversion -Wall -Wextra -pedantic -g -nostdinc++ -fvisibility=hidden -fno-exceptions -Wno-pedantic -O3 -Werror=thread-safety -ffreestanding -std=c++17 -MD -MT projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-aarch64.dir/linux.cpp.o -MF projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-aarch64.dir/linux.cpp.o.d -o projects/compiler-rt/lib/scudo/standalone/CMakeFiles/clang_rt.scudo_standalone-aarch64.dir/linux.cpp.o -c /home/user/llvm-project/compiler-rt/lib/scudo/standalone/linux.cpp
In file included from /home/user/llvm-project/compiler-rt/lib/scudo/standalone/linux.cpp:29:
In file included from /usr/include/aarch64-linux-gnu/sys/time.h:25:
/usr/include/aarch64-linux-gnu/bits/types/struct_timeval.h:8:8: error: redefinition of 'timeval'
struct timeval
 ^
/home/user/llvm-project/build_clean_full-libc_clang16-by-clang16/projects/compiler-rt/../libc/include/llvm-libc-types/struct_timeval.h:15:8: note: previous definition is here
struct timeval {
       ^
In file included from /home/user/llvm-project/compiler-rt/lib/scudo/standalone/linux.cpp:29:

```
For your information, on an aarch64 host, the failure is present on release/16.x and  release/17.x branches. On an aarch64 host, the failure is present if gcc-12 is used as a compiler. The commands builds full libc successfully on an x86 host with Linux using clang-16 . 
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEWF9z4jgS_zTOi0ousAOBBx4A4xnu-JMCcmSfXMJq29qVJU6SSbhPfyXZ4LBh72aqZivUTMCt1q__qPVTW0RrlguAkdebeL3ogVSmkGpESqJyopiRp4eDpOfRd-YFUzRHpERGnZnIkZHoUDFOUVZxjjg7pEgKRAQiRKVF_xEVUhukKiGs9oKJ6h1V2v5OORE57vZ9FEvO5ZuVeb0JlWlVgjDEMCm8XuQFg8KYo_bCsRfEXhBbGz7np9KXKveC2BpOrJXEOeIXpuReMESZVLVrFvjWO-fUNZLaHVMwjVJZlkRQbcNKpchYXilAXtBHTGhDOLdedCKvM_b6nfrfgeiiFm1_227W650XRl4QF7IEL4grDeriozWfXHEmqJ6VluQPQL5vI-OnEiGvN61HEEL4G1ox8TtxUuQFIfoGAhQxUjU6OFos_rVMZqvxZDFLnjfrf8ymu63zIXAZ9sKJNWy_OPXCSSrLI-OgsDJeEKAWeSbIgQNFRyV_h9To1olouhz_c5ZMXuaLKNn99jzzwiiCQ5W3k7fAITVNKZjzEa7u1XOnyXS9fJ4vZhsvjC4r346-vn4a94KJF0ysVpuQJtjFfDJN4pfFonbJC6P1CrmPdcf5swf0RoRBpoB27e-gzFfTxUs0S7bTl2h9AbqizEXKKwpom1ZUIiYc3A3Sxetks2vy45CS7W68isaL9WqW7Oe778nVYm3jY0ifIb7tn5PxdryyunGM7n_-CuKT_cat7-PNLLpFvIFwCzFfbXfjxSJ53szi-aurosemrG1Cam3hKrIpZOwW6_pkC8AwodvhttxuS7tVUIAVaFmpFHABhIJqp7ste33g9E-br378Lt_gZPfZ1C1Qo-4IBB0LogFlhHGNSF0P2pAckMwuio6MPrj5xkxRF86Vl0ApqT7v_VQKLXlT6_F4vrAZHrc7KIhvdpulLi-Ita0m-22IoIRLYYliuiR_QMw4uFk2p4kyvlNNWkXcsKpPmXJ4onr30-PRlw2bOMqxQwcmLkDtTsJREs0mL9_sj2-2Gl9fk_F2O9vs5uvV1klXL8l2_bKZzuyTVXl-vpDL9_Emmq1mUbJcR2442e4iu7Ft0ax2yXI83ay37UC83izHn8WL-XLeSuefuNKyIG5SaAOxlJKkHIhI7E52JZG4wLp9fDjj5qcXxD-d9x8w_8uAfiIO1tDO_we1jz814Yfr0R1Ivv8rIX_cy1-x5vWJarn6g-XseT5FOBMSayiJMCzFTBhQR6mZowucnZhmB8aZOWMmOBOgccEoBYHwvqGBiBID2LASPsgqkVdEUaCYnAjjpMEQ8IbwnnBuVd-NIgjvhcSVqDRQfCSKlGBAIbx_U8wA1kYxkWuE9ynRBv-7InZmybRtUnDGgFPMBDOMcPYfy5T4CNRFUgNzKXL3xyLUO384cCxMDHYO2NAZwntWHjlLmcEZ4dwUSlZ5YSfJEyigWL8xkxaYQkYqbmpwIeE9haPB9oR3IoFPTJmKcEyNtFFQ4GAA3xnRVZ6DNtjiK2ZXY18Hi1MpTqC0y78NlQOxTRtmgl4aQeuYIRSX5HwAXAldHY9SGaAIZ5SRXEhtWKpxKrkzVif8bqJzhEvLol4YEVWeBpjUFcGN_LCcNz7dLF-b7xxha5cy0WT6pny8MLoUjoWvM8ek0LVjLcw6_GDXFAoIxZpkYM4IZ5kCcLvIHkNYG2p9q611nxBeRggvd19z4uBl_CWGfYqw_KKQU_TL6PCKW5_cc4Eyxm334riKokzJ8u-wFo6D4bWV-UurdRfRiL0gbnKCHQ7ORWUNnG0eLQ_6hYXttR3SjwEcmFs_yybaOayq1CQW8ES4wxw0_68dGFJAIXMMKIVt4rzgqZngBU-19RoHXcR1x-n1ZlffvuLwuRiyUvw_Iu72LiELaaBuJ-HEZKXRh8CZRgUouBcv8p4m1y67bvNnX1lid1v2WCp0lpVCTGRSlfXLfjC9c3dw6eptC29fxpm2CdEgjFVWwIFoa73b998RERR9lD357-igiEgL0D5a_ww4y1CeprgbWKE9QxDRiFxfFHy0K6C9L3BFoz9cM-gqTUFrKzg3Ub0P-vVtiHvBuHcVgnz0QEchHYZD8gCjbn8Y9Hvh8HH4UIyGJKPDPu2FYRAGQfDY7_e6QzrMMkq6Wf_QeWCjoBOEnUHQDbrhsDP0oU8Hg6ewk5HBcPg4HHiPHSgJ49fLkwemdQWj_uPgafjAyQG4vlwAqZGrgkOVa--xw5k2up1mmOHuqshVeC9C8TXs5i6oSeedmyAXO78T-0Ol-Oj2pidnpqgOfirLttX9U3G6COxOckH8NwAA__-DXS_M">