path: root/configure
diff options
authorThiago Macieira <>2013-08-06 19:32:37 -0700
committerThe Qt Project <>2014-05-27 06:26:57 +0200
commit689e8055f5c4f3bbdbb9a90ac0405b5295f81374 (patch)
tree619de88b9d816d5d9d8b7b0fc420bd286f81627d /configure
parentcb09e1e88944e1ab9b0d00a95cdc71bdab69ad58 (diff)
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: 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 <>
Diffstat (limited to 'configure')
1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index bb52464e52..9bb09bc36d 100755
--- a/configure
+++ b/configure
@@ -6035,7 +6035,7 @@ for SUBARCH in SSE2 SSE3 SSSE3 SSE4_1 SSE4_2 AVX AVX2 \
case "$VAL" in
+ echo "#define QT_COMPILER_SUPPORTS_$SUBARCH 1" \