From a09fc184acd0874ea9876cdb2c4b123b226d8587 Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Wed, 15 Nov 2017 21:01:15 -0800
Subject: Add a configure-time check for QT_COMPILER_SUPPORTS_SIMD_ALWAYS

This has two main benefits:
 1) introduces a qmake CONFIG we can use in .pro/.pri/.prf files
 2) removes the need to keep an up-to-date list of which compilers
    support the feature

The test is implemented as trying to compile every single SIMD test we
currently have, but without passing the -mXXX option. The reason for
trying all of them is that some people may have modified their mkspecs
to add -mXXX options or -march=XXX, which could enable the particular
feature we tried, resulting in a false positive outcome.

Change-Id: I938b024e38bf4aac9154fffd14f7784dc8d1f020
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
---
 configure.json | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'configure.json')

diff --git a/configure.json b/configure.json
index 07549e0b7e..9ae3cc284a 100644
--- a/configure.json
+++ b/configure.json
@@ -218,7 +218,7 @@
     },
 
     "testTypeAliases": {
-        "compile": [ "library", "architecture" ]
+        "compile": [ "library", "architecture", "x86SimdAlways" ]
     },
 
     "tests": {
@@ -563,6 +563,11 @@
             "test": "avx512",
             "args": "AVX512=VBMI"
         },
+        "x86SimdAlways": {
+            "label": "Intrinsics without -mXXX argument",
+            "type": "x86SimdAlways",
+            "test": "x86_simd"
+        },
         "mips_dsp": {
             "label": "MIPS DSP instructions",
             "type": "subarch",
@@ -1111,6 +1116,14 @@
                 { "type": "define", "name": "QT_COMPILER_SUPPORTS_SHA", "value": 1 }
             ]
         },
+        "x86SimdAlways": {
+            "label": "Intrinsics without -mXXX option",
+            "condition": "(arch.i386 || arch.x86_64) && tests.x86SimdAlways",
+            "output": [
+                "privateConfig",
+                { "type": "define", "name": "QT_COMPILER_SUPPORTS_SIMD_ALWAYS", "value": 1 }
+            ]
+        },
         "mips_dsp": {
             "label": "DSP",
             "condition": "arch.mips && tests.mips_dsp",
@@ -1397,6 +1410,11 @@ Configure with '-qreal float' to create a build that is binary-compatible with 5
                             "args": "aesni f16c rdrnd shani",
                             "condition": "(arch.i386 || arch.x86_64)"
                         },
+                        {
+                            "type": "feature",
+                            "args": "x86SimdAlways",
+                            "condition": "(arch.i386 || arch.x86_64) && !config.msvc"
+                        },
                         {
                             "type": "feature",
                             "args": "neon",
-- 
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