From 199b67f11c7c5b9ae0aaf60f3e7ea20dafc21ce4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tor=20Arne=20Vestb=C3=B8?= <tor.arne.vestbo@qt.io>
Date: Thu, 18 Oct 2018 18:00:40 +0200
Subject: macOS: Log Qt and macOS version information at startup
MIME-Version: 1.0
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The SDK and deployment target versions are helpful to know when
diagnosing issues.

Change-Id: I85026bd9c1d706a923e8953837bd59bf9ed0266f
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
---
 src/plugins/platforms/cocoa/qcocoahelpers.mm | 82 ++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

(limited to 'src/plugins/platforms/cocoa/qcocoahelpers.mm')

diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.mm b/src/plugins/platforms/cocoa/qcocoahelpers.mm
index 0f5ddfa49a..36841c77ab 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.mm
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.mm
@@ -55,6 +55,9 @@
 
 #include <algorithm>
 
+#include <mach-o/dyld.h>
+#include <dlfcn.h>
+
 QT_BEGIN_NAMESPACE
 
 Q_LOGGING_CATEGORY(lcQpaWindow, "qt.qpa.window");
@@ -368,6 +371,85 @@ QString qt_mac_removeAmpersandEscapes(QString s)
     return QPlatformTheme::removeMnemonics(s).trimmed();
 }
 
+// -------------------------------------------------------------------------
+
+#if !defined(Q_PROCESSOR_X86_64)
+#error "32-bit builds are not supported"
+#endif
+
+QOperatingSystemVersion QMacVersion::buildSDK(VersionTarget target)
+{
+    switch (target) {
+    case ApplicationBinary: return applicationVersion().second;
+    case QtLibraries: return libraryVersion().second;
+    }
+    Q_UNREACHABLE();
+}
+
+QOperatingSystemVersion QMacVersion::deploymentTarget(VersionTarget target)
+{
+    switch (target) {
+    case ApplicationBinary: return applicationVersion().first;
+    case QtLibraries: return libraryVersion().first;
+    }
+    Q_UNREACHABLE();
+}
+
+QOperatingSystemVersion QMacVersion::currentRuntime()
+{
+    return QOperatingSystemVersion::current();
+}
+
+QMacVersion::VersionTuple QMacVersion::versionsForImage(const mach_header *machHeader)
+{
+    auto commandCursor = uintptr_t(machHeader) + sizeof(mach_header_64);
+    for (uint32_t i = 0; i < machHeader->ncmds; ++i) {
+        load_command *loadCommand = reinterpret_cast<load_command *>(commandCursor);
+        if (loadCommand->cmd == LC_VERSION_MIN_MACOSX) {
+            auto versionCommand = reinterpret_cast<version_min_command *>(loadCommand);
+            uint32_t dt = versionCommand->version; // Deployment target
+            uint32_t sdk = versionCommand->sdk; // Build SDK
+            return qMakePair(
+                QOperatingSystemVersion(QOperatingSystemVersion::MacOS,
+                    dt >> 16 & 0xffff, dt >> 8 & 0xff, dt & 0xff),
+                QOperatingSystemVersion(QOperatingSystemVersion::MacOS,
+                    sdk >> 16 & 0xffff, sdk >> 8 & 0xff, sdk & 0xff)
+            );
+        }
+        commandCursor += loadCommand->cmdsize;
+    }
+    Q_ASSERT_X(false, "QCocoaIntegration", "Could not find version-min load command");
+    Q_UNREACHABLE();
+}
+
+QMacVersion::VersionTuple QMacVersion::applicationVersion()
+{
+    static VersionTuple version = []() {
+        const mach_header *executableHeader = nullptr;
+        for (uint32_t i = 0; i < _dyld_image_count(); ++i) {
+            auto header = _dyld_get_image_header(i);
+            if (header->filetype == MH_EXECUTE) {
+                executableHeader = header;
+                break;
+            }
+        }
+        Q_ASSERT_X(executableHeader, "QCocoaIntegration", "Failed to resolve Mach-O header of executable");
+        return versionsForImage(executableHeader);
+    }();
+    return version;
+}
+
+QMacVersion::VersionTuple QMacVersion::libraryVersion()
+{
+    static VersionTuple version = []() {
+        Dl_info cocoaPluginImage;
+        dladdr((const void *)&QMacVersion::libraryVersion, &cocoaPluginImage);
+        Q_ASSERT_X(cocoaPluginImage.dli_fbase, "QCocoaIntegration", "Failed to resolve Mach-O header of Cocoa plugin");
+        return versionsForImage(static_cast<mach_header*>(cocoaPluginImage.dli_fbase));
+    }();
+    return version;
+}
+
 QT_END_NAMESPACE
 
 /*! \internal
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