Disable C++ exceptions in the Windows gn build

This avoids unnecessary destructor cleanups in swiftshader code. Posix systems use -fno-exceptions, so this updates the MSVC gn args with the equivalent, /EHs-c-. I noticed this while investigating an unrelated issue. Change-Id: Ic56e7560e7cb7617f8596b3ffda0444122425535 Reviewed-on: https://swiftshader-review.googlesource.com/14308Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Reid Kleckner <rnk@google.com>

Disable C++ exceptions in the Windows gn build
d19db3dc · Reid Kleckner · 536ffccd · d19db3dc
Commit d19db3dc authored Nov 29, 2017 by Reid Kleckner
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BUILD.gn BUILD.gn +2 -1

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--- a/BUILD.gn
+++ b/BUILD.gn
@@ -21,12 +21,13 @@ config("swiftshader_config") {
    cflags = [
      "/GS",  # Detects some buffer overruns
      "/Zc:wchar_t",
-      "/EHsc",
+      "/EHs-c-",  # Disable C++ exceptions
      "/nologo",
      "/Gd",  # Default calling convention
    ]
    defines += [
+      "_HAS_EXCEPTIONS=0",  # Disable EH usage in STL headers
      "_CRT_SECURE_NO_DEPRECATE",
      "NOMINMAX",
      "_WINDLL",