ParU on Mac: disable task tree when using gcc

ParU/CMakeLists.txt

@@ -56,11 +56,12 @@ if ( NOPENMP )
     set ( OpenMP_CXX_FOUND OFF )
     set ( OpenMP_C_FOUND OFF )
 else ( )
+    # OpenMP 4.5 or later is required
     find_package ( OpenMP )
     if ( OpenMP_CXX_FOUND AND OpenMP_CXX_VERSION VERSION_LESS 4.5 )
         set ( NOPENMP ON )
     endif ( )
-    if ( DEMO AND OpenMP_C_FOUND AND OpenMP_C_VERSION VERSION_LESS 4.5 )
+    if ( OpenMP_C_FOUND AND OpenMP_C_VERSION VERSION_LESS 4.5 )
         set ( NOPENMP ON )
     endif ( )
     if ( NOPENMP )
@@ -165,14 +166,14 @@ endif ( )
 # additional definitions
 #-------------------------------------------------------------------------------
 
-if ( WIN32 AND CMAKE_C_COMPILER_ID STREQUAL "GNU" )
-    # Some parallelization levels don't work correctly with GCC on Windows
-    # (because of emuTLS?). Omit them.
+if ( (APPLE OR WIN32) AND CMAKE_C_COMPILER_ID STREQUAL "GNU" )
+    # Some parallelization levels don't work correctly with GCC on Windows or
+    # Mac (because of emuTLS?). Omit them.
     if ( BUILD_SHARED_LIBS )
-        target_compile_definitions (ParU PRIVATE PARU_GCC_WINDOWS )
+        target_compile_definitions (ParU PRIVATE PARU_1TASK )
     endif ( )
     if ( BUILD_STATIC_LIBS )
-        target_compile_definitions (ParU_static PRIVATE PARU_GCC_WINDOWS )
+        target_compile_definitions (ParU_static PRIVATE PARU_1TASK )
     endif ( )
 endif ( )
 

ParU/Source/paru_factorize.cpp

@@ -341,13 +341,13 @@ ParU_Ret ParU_Factorize(cholmod_sparse *A, ParU_Symbolic *Sym,
     // execute the task tree
     //--------------------------------------------------------------------------
 
-#if ! defined ( PARU_GCC_WINDOWS )
-    // The parallel factorization gets stuck intermittently on Windows with GCC.
-    // Use the sequential factorization unconditionally in that case.
+#if ! defined ( PARU_1TASK )
+    // The parallel factorization gets stuck intermittently on Windows or Mac
+    // with gcc, so always use the sequential factorization in that case.
     if (task_Q.size() * 2 > Control->paru_max_threads)
     {
         PRLEVEL(1, ("Parallel\n"));
-        // chekcing user input
+        // checking user input
         PRLEVEL(1, ("Control: max_th=" LD " scale=" LD " piv_toler=%lf "
                     "diag_toler=%lf trivial =" LD " worthwhile_dgemm=" LD " "
                     "worthwhile_trsm=" LD "\n",