Add CI to build with clang on Windows

Author: MarijnS95

.github/workflows/ci.yaml

@@ -0,0 +1,18 @@
+on:
+  - push
+
+jobs:
+  build-clang:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          cmake -Bbuild -GNinja -DCMAKE_C_COMPILER=clang
+          cmake --build build
+  build-msvc:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          cmake -Bbuild
+          cmake --build build

Makefile

@@ -66,12 +66,11 @@ ifneq ($(shared), not-set)
 endif
 
 define run-config
-mkdir -p $(BUILDDIR)
-cd $(BUILDDIR) && cmake $(CURDIR) $(CONFIG_FLAGS)
+cmake $(CURDIR) -B"$(BUILDDIR)" $(CONFIG_FLAGS)
 endef
 
 all clean install: $(BUILDDIR)
-	make -C $(BUILDDIR) $@
+	make --build $(BUILDDIR) $@
 
 uninstall:
 	 xargs rm < $(BUILDDIR)/install_manifest.txt

cmake/GKlibSystem.cmake

@@ -1,14 +1,14 @@
 # Helper modules.
 
 # Add compiler flags.
-if(MSVC)
+if(WIN32)
   set(GKlib_COPTS "/Ox")
   set(GKlib_COPTIONS "-DWIN32 -DMSC -D_CRT_SECURE_NO_DEPRECATE -DUSE_GKREGEX")
 elseif(MINGW)
   set(GKlib_COPTS "-DUSE_GKREGEX")
 else()
   set(GKlib_COPTIONS "-DLINUX -D_FILE_OFFSET_BITS=64")
-endif(MSVC)
+endif(WIN32)
 
 if(CYGWIN)
   set(GKlib_COPTIONS "${GKlib_COPTIONS} -DCYGWIN")