[llvm-bugs] [Bug 47914] New: Compilation master (691eb814c1ae38d5015bf070dfed3fd54d542582 ) on Cygwin

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47914

            Bug ID: 47914
           Summary: Compilation master
                    (691eb814c1ae38d5015bf070dfed3fd54d542582 ) on Cygwin
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: other
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: albert.tests at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

I tried to compile the master version (691eb814c1ae38d5015bf070dfed3fd54d542582
) on Cygwin with GCC 9.3.0 and got the error:

[  0%] Building CXX object
lib/Support/CMakeFiles/LLVMSupport.dir/CrashRecoveryContext.cpp.o
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:348:25:
error: elements of array ‘sigaction PrevActions [6]’ have incomplete type
  348 | static struct sigaction PrevActions[NumSignals];
      |                         ^~~~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:348:25:
error: storage size of ‘PrevActions’ isn’t known
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:
In function ‘void CrashRecoverySignalHandler(int)’:
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:374:3:
error: ‘sigemptyset’ was not declared in this scope
  374 |   sigemptyset(&SigMask);
      |   ^~~~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:375:3:
error: ‘sigaddset’ was not declared in this scope
  375 |   sigaddset(&SigMask, Signal);
      |   ^~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:376:15:
error: ‘SIG_UNBLOCK’ was not declared in this scope
  376 |   sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
      |               ^~~~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:376:3:
error: ‘sigprocmask’ was not declared in this scope
  376 |   sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
      |   ^~~~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:
In function ‘void installExceptionOrSignalHandlers()’:
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:393:20:
error: aggregate ‘sigaction Handler’ has incomplete type and cannot be defined
  393 |   struct sigaction Handler;
      |                    ^~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:396:3:
error: ‘sigemptyset’ was not declared in this scope
  396 |   sigemptyset(&Handler.sa_mask);
      |   ^~~~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:399:52:
error: invalid use of incomplete type ‘struct sigaction’
  399 |     sigaction(Signals[i], &Handler, &PrevActions[i]);
      |                                                    ^
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:348:15:
note: forward declaration of ‘struct sigaction’
  348 | static struct sigaction PrevActions[NumSignals];
      |               ^~~~~~~~~
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:
In function ‘void uninstallExceptionOrSignalHandlers()’:
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:406:51:
error: invalid use of incomplete type ‘struct sigaction’
  406 |     sigaction(Signals[i], &PrevActions[i], nullptr);
      |                                                   ^
/cygdrive/e/Programs/LLVM/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:348:15:
note: forward declaration of ‘struct sigaction’
  348 | static struct sigaction PrevActions[NumSignals];
      |               ^~~~~~~~~
make[2]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/build.make:460:
lib/Support/CMakeFiles/LLVMSupport.dir/CrashRecoveryContext.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:14907:
lib/Support/CMakeFiles/LLVMSupport.dir/all] Error 2
make: *** [Makefile:172: all] Error 2

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