[Bug 57372] New: wine fails to compile on FreeBSD-15.0/aarch64 (dlls/ntdll/unix/signal_arm64.o)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57372

            Bug ID: 57372
           Summary: wine fails to compile on FreeBSD-15.0/aarch64
                    (dlls/ntdll/unix/signal_arm64.o)
           Product: Wine
           Version: 9.20
          Hardware: x86-64
                OS: FreeBSD
            Status: NEW
          Keywords: download, source
          Severity: critical
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs(a)winehq.org
          Reporter: austinenglish(a)gmail.com

Created attachment 77340
  --> https://bugs.winehq.org/attachment.cgi?id=77340
build log

Note for those with cfarm access; this is on cfarm247.

I've built llvm-mingw-20241015 and it is available in $PATH.

`./configure && make` then fails with:
cc -c -o dlls/ntdll/unix/signal_arm64.o dlls/ntdll/unix/signal_arm64.c
-Idlls/ntdll -Iinclude -D__WINESRC__ -D_NTSYSTEM_  -D_ACRTIMP= -DWINBASEAPI=
-DWINE_UNIX_LIB -Wall -pipe -fcf-protection=none -fvisibility=hidden 
-fno-stack-protector -fno-strict-aliasing -Wdeclaration-after-statement
-Wempty-body  -Wignored-qualifiers -Winit-self -Wpointer-arith -Wno-pragma-pack
-Wstrict-prototypes  -Wtype-limits -Wunused-but-set-parameter -Wvla
-Wwrite-strings -gdwarf-4 -fPIC  -fasynchronous-unwind-tables -g -O2

$ grep -A1 error log.txt
dlls/ntdll/unix/signal_arm64.c:334:28: error: expression is not assignable
  334 |     FP_sig(sigcontext)     = context->Fp;   /* Frame pointer */
--
dlls/ntdll/unix/signal_arm64.c:335:28: error: expression is not assignable
  335 |     LR_sig(sigcontext)     = context->Lr;   /* Link register */
--
dlls/ntdll/unix/signal_arm64.c:336:28: error: expression is not assignable
  336 |     SP_sig(sigcontext)     = context->Sp;   /* Stack pointer */
--
dlls/ntdll/unix/signal_arm64.c:337:28: error: expression is not assignable
  337 |     PC_sig(sigcontext)     = context->Pc;   /* Program Counter */
--
dlls/ntdll/unix/signal_arm64.c:338:28: error: expression is not assignable
  338 |     PSTATE_sig(sigcontext) = context->Cpsr; /* Current State Register
*/
--
dlls/ntdll/unix/signal_arm64.c:339:57: error: expression is not assignable
  339 |     for (i = 0; i <= 28; i++) REGn_sig( i, sigcontext ) =
context->X[i];
--

$ cc --version
FreeBSD clang version 18.1.6 (https://github.com/llvm/llvm-project.git
llvmorg-18.1.6-0-g1118c2e05e67)
Target: aarch64-unknown-freebsd15.0
Thread model: posix
InstalledDir: /usr/bin

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