Add support for single-file multi-target intrinsics in Qt

GCC 4.9 now allows us to #include any and all intrinsics headers, not
just the one for which we're compiling code, a behavior that ICC and
MSVC have had for some time. With that, we're able to have the functions
for different targets in the same source file. See the GCC manual:
  http://gcc.gnu.org/onlinedocs/gcc/Function-Multiversioning.html

This functionality is notified by the QT_COMPILER_SUPPORTS_HERE(XXX)
macro, which indicates that all the intrinsics from
QT_COMPILER_SUPPORTS_xxx are available and enabled. To complement, a
QT_COMPILER_SUPPORTS(XXX) macro is also added.

Unlike ICC and MSVC, GCC requires a special function attribute, which
will also cause code optimization. That's the QT_FUNCTION_TARGET macro.

Note: because of the absence of the target attribute, ICC and MSVC will
not generate instructions with the VEX prefix unless they only exist
with the VEX prefix or if -mavx / -arch:AVX are enabled.

Change-Id: I0c1880c20324bd8e0fc68a863e36d1fa7755dff0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index 37bf576d37..06083f2592 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -3476,21 +3476,21 @@ void Configure::generateConfigfiles()
 
         tmpStream << endl << "// Compiler sub-arch support" << endl;
         if (dictionary[ "SSE2" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE2" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE2 1" << endl;
         if (dictionary[ "SSE3" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE3" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE3 1" << endl;
         if (dictionary[ "SSSE3" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_SSSE3" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_SSSE3 1" << endl;
         if (dictionary[ "SSE4_1" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE4_1" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE4_1 1" << endl;
         if (dictionary[ "SSE4_2" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE4_2" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_SSE4_2 1" << endl;
         if (dictionary[ "AVX" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_AVX" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_AVX 1" << endl;
         if (dictionary[ "AVX2" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_AVX2" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_AVX2 1" << endl;
         if (dictionary[ "IWMMXT" ] == "yes")
-            tmpStream << "#define QT_COMPILER_SUPPORTS_IWMMXT" << endl;
+            tmpStream << "#define QT_COMPILER_SUPPORTS_IWMMXT 1" << endl;
 
         if (dictionary["QREAL"] != "double")
             tmpStream << "#define QT_COORD_TYPE " << dictionary["QREAL"] << endl;