<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/77028>77028</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang produces broken reproducers when invoked as assembler
        </td>
    </tr>

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

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

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

<pre>
    TL;DR: if clang crashes when invoked as an assembler on a .S file (assembly with CPP directives) it produces a reproducer that doesn't work due to a mismatch between the invocation of `clang -cc1as` and the partially preprocessed source file. It's unclear if the source should be more fully processed or the command in the .sh file should be different.

Due to a bug in assembly I hit an assert in the PowerPC backend.
```
Assertion failed: (MO.isImm() && "Relocation required in an instruction that we cannot encode!"), function getMachineOpValue, file /home/bed22/cheri/freebsd/contrib/llvm-project/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp, line 406.
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin/clang -cc1as -triple powerpc-unknown-freebsd15.0 -filetype obj -main-file-name symlink-7b6cec.S -target-cpu ppc -target-feature +secure-plt -fdebug-compilation-dir=/tmp -dwarf-debug-producer "FreeBSD clang version 17.0.6 (https://github.com/llvm/llvm-project.git llvmorg-17.0.6-0-g6009708b4367)" -debug-info-kind=constructor -dwarf-version=4 -mrelocation-model static -object-file-name=/dev/null -o /dev/null /tmp/symlink-7b6cec-448e06.s
#0 0x0000000003a27ca6 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin/clang+0x3a27ca6)
#1 0x0000000003a26175 llvm::sys::RunSignalHandlers() (/home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin/clang+0x3a26175)
#2 0x0000000003a2823e SignalHandler(int) (/home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin/clang+0x3a2823e)
#3 0x00000000049397df handle_signal (/home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin/clang+0x49397df)
clang: error: unable to execute command: Abort trap (core dumped)
clang: error: clang integrated assembler command failed due to signal (use -v to see invocation)
FreeBSD clang version 17.0.6 (https://github.com/llvm/llvm-project.git llvmorg-17.0.6-0-g6009708b4367)
Target: powerpc-unknown-freebsd15.0
Thread model: posix
InstalledDir: /home/bed22/tmp/obj/home/bed22/cheri/freebsd/powerpc.powerpc64/tmp/usr/bin
clang: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/symlink-7b6cec.S
clang: note: diagnostic msg: /tmp/symlink-7b6cec.sh
clang: note: diagnostic msg: 

********************
```
Clang dutifully produced the reproducers in https://gist.github.com/brooksdavis/4f2f973eb0c001603e79143233418450 which fail to reproduce the problem with many errors which look like it's trying to parse unexpanded macros as assembly.
```
/home/bed22/cheri/freebsd/lib/libsys/../libc/include/compat.h:42:22: error: expected ')'
__sym_compat(__semctl, freebsd7___semctl, FBSD_1.0);
 ^
/home/bed22/cheri/freebsd/lib/libsys/../libc/include/compat.h:42:13: error: unknown operand
__sym_compat(__semctl, freebsd7___semctl, FBSD_1.0);
            ^
...
```
I believe the issue is that `clang -cc1as` expects a fully processed assembly file, not one where includes have been embedded. The file is a hacked up version of the reproducer script that invokes clang in a way that actually triggers the crash.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEWE1v4zjS_jXMpSBBphR_HHxw4ng6QPcbo5N39xhQZEliWyK1JBXH_35BUlacbHbQg5mdNoLYIlnFp76rxKyVtUJck-sbcr29YoNrtFmXRuuDFexF2qtSi9P66SvJb7bfSb4BWQFvmaqBG2YbtHBsUIFUL_qAApgFpoBZi13ZogGtgEH6CJVsEQhdjjsnOErXwO1-D0Ia5E6-oCV0BdJBb7QYOFpgYHB8MOAa5kBotIrQhYOjNgcQA4LTwKCTtmOON1CiOyIqcA0GSJw5qRXoCsg8i7ATzmfMknkGTIlwsGfGSda2J-jDhRytRQFWD4ZjQJ7CvSN0YWFQvEVmvBI85XjENnpoBZQInTYI1RB5nRlpEw5z3XX-ShnhpbaJWnmjFrKq0KByKcm2JNvE_9uzlOVQe-JJhffQSHdWt3Fnxnt9RLO_hZLxAypx5jXPxr_wuAkkXjcVky0Kb1lCl98eUmnvu47QpbcGoXNC50Ao_Y7tWZkG_zVIg0EQ5i1vnRl42ApGOiJwppR2gIprgYTOCKWErgi9hWpQ8WiN7hvjjVT40P-DtQOG3eglu0Z3SOiuROEJd7xBIwndVQaxtMKvaOWMLAndte1Ll_RG_0Duxkf_FfaemKnRr44qIXT37TYubtFyv7G__XZ7qwXeddI5NCnvew-klQqhyOaj8vZf7zaPd2CHsvMaD5Yw2GvjvGUa53pL8g2hOw96qG06Ik21qQndRTpCdxDtz9tBYPQJH0PBUs4wHnTwiQ_6ZU_JrNVcMocCzKDAciP7s688OsZ9RHS9RxKWshTCZ290bVgHzNRDh8rZaOyPWnZdT-hOlz9-xgC912jP0_F7XkwMBms8pVSe7iLiIHFG9i3CSJIM6qD0USUj09l1mkHiPcCdegRd_oCkY1KFpUSxDsGeulaqQ7Io5xx5-giJC8ZMeD9A3_PpuULmBuNd6cYiHwwmfesgqQSWQ51w3fWyDc6cCGlIvo3gIRFHZqoknpoyD6F0ZxBvHrdj4ntBY70LzxZplvroWL73gFq6ZihTrrsLh7xw07SWDvyCNnUSmSRZUs-zbLXIlmWRzxchWiiMUKSqdHKQSpB8y_UYb9qc8Y54SL4tIOnMFKlJpwW2YB1zkkOiS3_5mzqj3AJfCN2poW0h0fB-YbLpe8UnRbHEbJ7aMbPQPIPsNTt_ckYXnM2DhF4n-caebPyxN1K54KlP0d2Xb4cMOz5r6wyyLqSdW5DKxSS0_PucldCb7HWUwBvhLOHsg4Tz2eL6Mwm_D-pR1oq1X5gSLRo7ZdJfIIQHeSkE_SDEkuYI7-ASuvyVWveALgHnl4CLVb5aiAqaAPXZBty_AOeIY8IZd_INoDHa-B-DYmUbija-Ih_cVPv95qYMZcOw3mPnvmHwWRvF7zCMeUcqh7UJ6f-twTp3FbGMn1uiN-UMFiF5CWt42RNNt_2S3BZuHstzvvm9kjAebQwyASGhRQIrX-PWvbKOtS2KrTR_U2F7byWlHfpvIVmttPW5trNh5-zHf-Lvog8cm5DN09Pm9gs8fbmD3cPXrw__vP-_32B3__XuEZ4ewvLN__8G3-_2D9-fplZg_1lTsQwd939tLKYDBiGUFO93bmL5M_J_Xj_Sxz_NwTZ_1Ah_lSnet9G3IWjE4OTU9PumIc4Vb9OL9b3yx0CyIVjeouli6CJ0V1S0Wi1yLDOeZbN5luNiNStymufFbFlcZ3BsJG9C2Pvgnu6KE43RZYtdHLI6pk4xldiRqNX6AK08IMg41jhzkqr2fHpmLMKg8LVnSqCAjnGjbZjrxrnj84HiZ2IrduWtLH25pLs0jU--ER-b4tDadz1zaUPyTUFJvqH0XSrE1x65d0VCY5e0iPc_P9tT9xyJCV0-P1vsuGvDVBEBLJ4vF3c3j9vnWZp5HvlN5AHk-u5_LM0s_1ApQsID3aPx9eGvE-XiM0mVpp_b7h5KbCW-ROeR1g7-f5zmPpmbown8fP5x0p1GU99kemh-CtQK4digwfPkY6FhLwilH9SxK1EIFCk8NXHW9jczaPzwKmDop4qkqw9BNaapCDO-f7BTpQQGR3aKe4y7IYz3zsi69tE4jV7plVjnYpWv2BWuZ4usKGb5vCiumvWyFJReZ1jw5WLFWTFfLiq2EjOWL7DKq-JKrmlGi2yWXWfZrMiKdJmXS1ZmcyyqYpZlGSky7JhsU18O_SR4FTS7XiwyurxqWYmtDe9dKB2bC0qut1dmHeqpHyNJkbXSOvvGwUnX4jpmnek9SWn0AdW7dPMf72TO_cLVYNr1Hyvp3p89cO_kAfu_AwAA___ACM06">