_

compiler/extccomp.nim

@@ -547,12 +547,17 @@ proc getOptSize(conf: ConfigRef; c: TSystemCC): string =
   if result == "":
     result = CC[c].optSize    # use default settings from this file
 
+proc flagsToNative(flags: string, c: TSystemCC): string =
+  ## replaces ' -X' by ' /X' for VCC; works ok for some common flags.
+  if c == ccVcc: result = flags.replace(" -", " /")
+  else: result = flags
+
 proc getWarnings(conf: ConfigRef; c: TSystemCC): string =
   result = getConfigVar(conf, c, ".options.warnings")
-  if not conf.hasWarn(warnBackendWarning): # disable all warnings
-    case c
-    of ccVcc: result.add " /w"
-    else: result.add " -w"
+  if not conf.hasWarn(warnBackendWarning):
+    result.add " -w".flagsToNative(c) # disable all warnings
+  else:
+    result.add " -DNIM_UNIGNORE_DEFAULT_BACKEND_WARNINGS".flagsToNative(c)
 
 proc noAbsolutePaths(conf: ConfigRef): bool {.inline.} =
   # We used to check current OS != specified OS, but this makes no sense

config/config.nims

@@ -4,8 +4,7 @@ when defined(nimHasCppDefine):
   cppDefine "errno"
   cppDefine "unix"
 
-when false:
- block: # warnings
+block: # warnings
   #[
   ## ignore typical warnings in Nim-generated files
 
@@ -28,22 +27,7 @@ when false:
   ]#
 
   let clangWarningsCommon = "-Wno-logical-op-parentheses -Wno-invalid-noreturn -Wno-tautological-constant-out-of-range-compare -Wno-switch-bool"
-
   let clangWarningsC = clangWarningsCommon & " -Wno-incompatible-pointer-types-discards-qualifiers"
-
   let clangWarningsCpp = clangWarningsCommon & " -Wno-writable-strings -Wno-invalid-offsetof"
-
-  let gccWarnings = " "
-
-  for cc in ["clang"]:
-    switch(cc & ".options.warnings", clangWarningsC)
-    switch(cc & ".cpp.options.warnings", clangWarningsCpp)
-
-  block: # vcc
-    let vccWarnings = "/wd4005 /wd4100 /wd4101 /wd4189 /wd4191 /wd4200 /wd4244 /wd4293 /wd4296 /wd4309 /wd4310 /wd4365 /wd4456 /wd4477 /wd4514 /wd4574 /wd4611 /wd4668 /wd4702 /wd4706 /wd4710 /wd4711 /wd4774 /wd4800 /wd4809 /wd4820 /wd4996 /wd4090 /wd4297"
-    switch("vcc.options.warnings", vccWarnings)
-
-    when defined(vcc):
-      switch("passc", "/w")
-    else:
-      switch("passc", "-w")
+  switch("clang.options.warnings", clangWarningsC)
+  switch("clang.cpp.options.warnings", clangWarningsCpp)