add test for vcc compiler

.appveyor.yml

@@ -34,6 +34,9 @@ build_script:
 
 test_script:
   - nimble test
+  - IF "%PLATFORM%" == "x86" CALL "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars32.bat"
+  - IF "%PLATFORM%" == "x64" CALL "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
+  - nimble testvcc
 
 deploy: off
 

.gitignore

@@ -1 +1,2 @@
 nimcache
+*.exe

stew.nimble

@@ -12,3 +12,7 @@ requires "nim >= 1.2.0"
 task test, "Run all tests":
   exec "nim c -r --threads:off tests/all_tests"
   exec "nim c -r --threads:on -d:nimTypeNames tests/all_tests"
+
+task testvcc, "Run all tests with vcc compiler":
+  exec "nim c -r --cc:vcc --threads:off tests/all_tests"
+  exec "nim c -r --cc:vcc --threads:on -d:nimTypeNames tests/all_tests"

tests/nim.cfg

@@ -0,0 +1,4 @@
+vcc.exe = "cl.exe"
+vcc.cpp.exe = "cl.exe"
+vcc.linkerexe = "cl.exe"
+vcc.cpp.linkerexe = "cl.exe"