[test]

Author: kinke

runtime/druntime/src/core/sys/posix/unistd.d

@@ -671,7 +671,21 @@ version (CRuntime_Glibc)
         _SC_LEVEL4_CACHE_LINESIZE,
 
         _SC_IPV6 = _SC_LEVEL1_ICACHE_SIZE + 50,
-        _SC_RAW_SOCKETS
+        _SC_RAW_SOCKETS,
+        _SC_V7_ILP32_OFF32,
+        _SC_V7_ILP32_OFFBIG,
+        _SC_V7_LP64_OFF64,
+        _SC_V7_LPBIG_OFFBIG,
+        _SC_SS_REPL_MAX,
+        _SC_TRACE_EVENT_NAME_MAX,
+        _SC_TRACE_NAME_MAX,
+        _SC_TRACE_SYS_MAX,
+        _SC_TRACE_USER_EVENT_MAX,
+        _SC_XOPEN_STREAMS,
+        _SC_THREAD_ROBUST_PRIO_INHERIT,
+        _SC_THREAD_ROBUST_PRIO_PROTECT,
+        _SC_MINSIGSTKSZ,
+        _SC_SIGSTKSZ,
     }
 }
 else version (Darwin)

runtime/druntime/src/etc/linux/memoryerror.d

@@ -50,7 +50,9 @@ import ucontext = core.sys.posix.ucontext;
 
 version (MemoryAssertSupported)
 {
+    import core.stdc.stdlib : malloc;
     import core.sys.posix.signal : SA_ONSTACK, sigaltstack, SIGSTKSZ, stack_t;
+    import core.sys.posix.unistd : sysconf, _SC_SIGSTKSZ;
 }
 
 @system:
@@ -423,10 +425,21 @@ version (MemoryAssertSupported)
 
         // Set up alternate stack, because segfaults can be caused by stack overflow,
         // in which case the stack is already exhausted
-        __gshared ubyte[SIGSTKSZ] altStack;
+        auto altStackSize = sysconf(_SC_SIGSTKSZ);
+        if (altStackSize <= 0)
+            altStackSize = SIGSTKSZ;
+
+        __gshared void* altStack; // only allocate once; never free'd
+        if (!altStack)
+        {
+            altStack = malloc(altStackSize);
+            if (!altStack)
+                return false;
+        }
+
         stack_t ss;
-        ss.ss_sp = altStack.ptr;
-        ss.ss_size = altStack.length;
+        ss.ss_sp = altStack;
+        ss.ss_size = altStackSize;
         ss.ss_flags = 0;
         if (sigaltstack(&ss, null) == -1)
             return false;