DRAFT 596 - test GH Actions with some fixes

* Fix 'unused GC_set_and_save_fault_handler' warning on OS X
* Always declare GC_set_and_save_fault_handler before its definition
* Fix undefined GC_real_pthread_sigmask if redirect malloc on OS X
* Move GC_unblock_gc_signals to pthread_stop_world.c
* Fix 'implicit declaration of pthread_setname_np' gcc error on MinGW
* Fix for getenv warnings on Win32 (draft)
* Fix for malloc redirection on Win32 (draft)

.github/workflows/cmake-build.yml

@@ -16,7 +16,7 @@ jobs:
         os: [ macos-latest, ubuntu-latest, windows-latest ]
         c_compiler: [ cl, clang, gcc ]
         build_type: [ Release ]
-        disable_gc_debug: [ off ]
+        disable_gc_debug: [ on ] # off
         gc_assertions: [ off ]
         large_config: [ off ]
         enable_threads: [ off, on ]
@@ -32,19 +32,19 @@ jobs:
         - os: windows-latest # TODO: support dependency on libatomic_ops
           c_compiler: cl
           enable_threads: on
-        - os: windows-latest # TODO: enable following
-          c_compiler: clang
-        - os: macos-latest
-          c_compiler: clang
-          enable_threads: on
-          redirect_malloc: on
-        - os: windows-latest
-          c_compiler: cl
-          enable_threads: off
-          redirect_malloc: on
-        - os: windows-latest
-          c_compiler: gcc
-          enable_threads: on
+        #- os: windows-latest # TODO: enable following
+        #  c_compiler: clang
+        #- os: macos-latest
+        #  c_compiler: clang
+        #  enable_threads: on
+        #  redirect_malloc: on
+        #- os: windows-latest
+        #  c_compiler: cl
+        #  enable_threads: off
+        #  redirect_malloc: on
+        #- os: windows-latest
+        #  c_compiler: gcc
+        #  enable_threads: on
         include:
         - os: windows-latest
           c_compiler: gcc
@@ -80,6 +80,8 @@ jobs:
         -Denable_werror=ON
         -Werror=dev
         -S ${{ github.workspace }}
+#        -DCMAKE_CXX_COMPILER=${{ matrix.cxx_compiler }}
+#        -Denable_cplusplus=ON
 
     - name: Build
       # Build the code with the given configuration.