v8config.h: introduce V8_LIBC_MSVCRT

Use this for detecting MSVCRT library features instead of
V8_CC_MSVC.

One use case for this is when compiling with Clang together with the
MSVC library. In that case, V8_CC_MSVC will be false, but V8_LIBC_MSVCRT
will be true.

BUG=82385
LOG=n
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/145593003

Patch from Hans Wennborg <hans@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18888 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8config.h

@@ -139,6 +139,7 @@
 // -----------------------------------------------------------------------------
 // C library detection
 //
+//  V8_LIBC_MSVCRT  - MSVC libc
 //  V8_LIBC_BIONIC  - Bionic libc
 //  V8_LIBC_BSD     - BSD libc derivate
 //  V8_LIBC_GLIBC   - GNU C library
@@ -150,7 +151,9 @@
 //   ...
 //  #endif
 
-#if defined(__BIONIC__)
+#if defined (_MSC_VER)
+# define V8_LIBC_MSVCRT 1
+#elif defined(__BIONIC__)
 # define V8_LIBC_BIONIC 1
 # define V8_LIBC_BSD 1
 #elif defined(__UCLIBC__)

src/cpu.cc

@@ -27,7 +27,7 @@
 
 #include "cpu.h"
 
-#if V8_CC_MSVC
+#if V8_LIBC_MSVCRT
 #include <intrin.h>  // __cpuid()
 #endif
 #if V8_OS_POSIX
@@ -54,8 +54,8 @@ namespace internal {
 
 #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
 
-// Define __cpuid() for non-MSVC compilers.
-#if !V8_CC_MSVC
+// Define __cpuid() for non-MSVC libraries.
+#if !V8_LIBC_MSVCRT
 
 static V8_INLINE void __cpuid(int cpu_info[4], int info_type) {
 #if defined(__i386__) && defined(__pic__)
@@ -77,7 +77,7 @@ static V8_INLINE void __cpuid(int cpu_info[4], int info_type) {
 #endif  // defined(__i386__) && defined(__pic__)
 }
 
-#endif  // !V8_CC_MSVC
+#endif  // !V8_LIBC_MSVCRT
 
 #elif V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS
 

src/globals.h

@@ -38,7 +38,7 @@
 #if V8_CC_GNU && V8_GNUC_PREREQ(2, 96, 0) && !V8_GNUC_PREREQ(4, 1, 0)
 # include <limits>  // NOLINT
 # define V8_INFINITY std::numeric_limits<double>::infinity()
-#elif V8_CC_MSVC
+#elif V8_LIBC_MSVCRT
 # define V8_INFINITY HUGE_VAL
 #else
 # define V8_INFINITY INFINITY

src/platform.h

@@ -64,7 +64,7 @@ int signbit(double x);
 #endif
 
 // Microsoft Visual C++ specific stuff.
-#if V8_CC_MSVC
+#if V8_LIBC_MSVCRT
 
 #include "win32-headers.h"
 #include "win32-math.h"
@@ -91,7 +91,7 @@ inline int lrint(double flt) {
 }
 #endif  // _MSC_VER < 1800
 
-#endif  // V8_CC_MSVC
+#endif  // V8_LIBC_MSVCRT
 
 namespace v8 {
 namespace internal {

src/preparser.cc

@@ -42,7 +42,7 @@
 #include "unicode.h"
 #include "utils.h"
 
-#if V8_CC_MSVC && (_MSC_VER < 1800)
+#if V8_LIBC_MSVCRT && (_MSC_VER < 1800)
 namespace std {
 
 // Usually defined in math.h, but not in MSVC until VS2013+.