tcg/i386: Fix build for systems without working cpuid.h (MacOSX, Win32)

Win32 doesn't have a cpuid.h, and MacOSX may have one but without
the __cpuid() function we use, which means that commit 9d2eec20
broke the build for those platforms. Fix this by tightening up
our configure cpuid.h check to test that the functions we need
are present, and adding some missing #ifdef guards in
tcg/i386/tcg-target.c.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>

1 files changed, 12 insertions, 1 deletions

diff --git a/configure b/configure
index 4648117957..79eb54c3ef 100755
--- a/configure
+++ b/configure
@@ -3564,7 +3564,18 @@ cpuid_h=no
 cat > $TMPC << EOF
 #include <cpuid.h>
 int main(void) {
-  return 0;
+    unsigned a, b, c, d;
+    int max = __get_cpuid_max(0, 0);
+
+    if (max >= 1) {
+        __cpuid(1, a, b, c, d);
+    }
+
+    if (max >= 7) {
+        __cpuid_count(7, 0, a, b, c, d);
+    }
+
+    return 0;
 }
 EOF
 if compile_prog "" "" ; then