https://issues.dlang.org/show_bug.cgi?id=23877

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla@digitalmars.com

--- Comment #1 from Walter Bright <bugzilla@digitalmars.com> ---
The problem is that in druntime/src/__builtins.di, which is loaded on every compile of an ImportC program, defines:

    ushort __builtin_bswap16()(ushort value)
    {
        import core.bitop;
        return core.bitop.byteswap(value);
    }

and core.bitop.byteswap is defined in the D runtime library, not the C one. Hence it shows up as an undefined symbol when a link is attempted.

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https://issues.dlang.org/show_bug.cgi?id=23877

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |ImportC

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https://issues.dlang.org/show_bug.cgi?id=23877

Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ImportC: Importing          |ImportC: Importing
                   |byteswap.h results in       |byteswap.h results in
                   |undefined reference to      |undefined reference to
                   |core.bitop.byteswap with    |core.bitop.byteswap
                   |-betterC                    |

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https://issues.dlang.org/show_bug.cgi?id=23877

--- Comment #2 from Walter Bright <bugzilla@digitalmars.com> ---
-betterC is irrelevant for ImportC.

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https://issues.dlang.org/show_bug.cgi?id=23877

Dlang Bot <dlang-bot@dlang.rocks> changed:

           What    |Removed                     |Added
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           Keywords|                            |pull

--- Comment #3 from Dlang Bot <dlang-bot@dlang.rocks> ---
@WalterBright created dlang/dmd pull request #15224 "fix Issue 23877 - ImportC: Importing byteswap.h results in undefined …" fixing this issue:

- fix Issue 23877 - ImportC: Importing byteswap.h results in undefined reference to core.bitop.byteswap

https://github.com/dlang/dmd/pull/15224

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https://issues.dlang.org/show_bug.cgi?id=23877

Dlang Bot <dlang-bot@dlang.rocks> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Dlang Bot <dlang-bot@dlang.rocks> ---
dlang/dmd pull request #15224 "fix Issue 23877 - ImportC: Importing byteswap.h results in undefined …" was merged into master:

- c9b63234d03cd95ca4da665c2765ec355525b398 by Walter Bright:
  fix Issue 23877 - ImportC: Importing byteswap.h results in undefined
reference to core.bitop.byteswap

https://github.com/dlang/dmd/pull/15224

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