1 files changed, 88 insertions, 0 deletions
diff --git a/src/corelib/kernel/qcore_mac.cpp b/src/corelib/kernel/qcore_mac.cpp
index b048576f5b..bef50d8d9b 100644
--- a/src/corelib/kernel/qcore_mac.cpp
+++ b/src/corelib/kernel/qcore_mac.cpp
@@ -45,6 +45,9 @@
 #include "qmutex.h"
 #include "qvarlengtharray.h"
 
+#include <dlfcn.h>
+#include <mach-o/dyld.h>
+
 QT_BEGIN_NAMESPACE
 
 QCFString::operator QString() const
@@ -159,4 +162,89 @@ os_log_t AppleUnifiedLogger::cachedLog(const QString &subsystem, const QString &
 
 // --------------------------------------------------------------------------
 
+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)
+{
+    static auto makeVersionTuple = [](uint32_t dt, uint32_t sdk) {
+        return qMakePair(
+            QOperatingSystemVersion(QOperatingSystemVersion::currentType(),
+                dt >> 16 & 0xffff, dt >> 8 & 0xff, dt & 0xff),
+            QOperatingSystemVersion(QOperatingSystemVersion::currentType(),
+                sdk >> 16 & 0xffff, sdk >> 8 & 0xff, sdk & 0xff)
+        );
+    };
+
+    const bool is64Bit = machHeader->magic == MH_MAGIC_64 || machHeader->magic == MH_CIGAM_64;
+    auto commandCursor = uintptr_t(machHeader) + (is64Bit ? sizeof(mach_header_64) : sizeof(mach_header));
+
+    for (uint32_t i = 0; i < machHeader->ncmds; ++i) {
+        load_command *loadCommand = reinterpret_cast<load_command *>(commandCursor);
+        if (loadCommand->cmd == LC_VERSION_MIN_MACOSX || loadCommand->cmd == LC_VERSION_MIN_IPHONEOS
+            || loadCommand->cmd == LC_VERSION_MIN_TVOS || loadCommand->cmd == LC_VERSION_MIN_WATCHOS) {
+            auto versionCommand = reinterpret_cast<version_min_command *>(loadCommand);
+            return makeVersionTuple(versionCommand->version, versionCommand->sdk);
+#if QT_DARWIN_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_13, __IPHONE_11_0, __TVOS_11_0, __WATCHOS_4_0)
+        } else if (loadCommand->cmd == LC_BUILD_VERSION) {
+            auto versionCommand = reinterpret_cast<build_version_command *>(loadCommand);
+            return makeVersionTuple(versionCommand->minos, versionCommand->sdk);
+#endif
+        }
+        commandCursor += loadCommand->cmdsize;
+    }
+    Q_ASSERT_X(false, "QMacVersion", "Could not find any version 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, "QMacVersion", "Failed to resolve Mach-O header of executable");
+        return versionsForImage(executableHeader);
+    }();
+    return version;
+}
+
+QMacVersion::VersionTuple QMacVersion::libraryVersion()
+{
+    static VersionTuple version = []() {
+        Dl_info qtCoreImage;
+        dladdr((const void *)&QMacVersion::libraryVersion, &qtCoreImage);
+        Q_ASSERT_X(qtCoreImage.dli_fbase, "QMacVersion", "Failed to resolve Mach-O header of QtCore");
+        return versionsForImage(static_cast<mach_header*>(qtCoreImage.dli_fbase));
+    }();
+    return version;
+}
+
+// -------------------------------------------------------------------------
+
 QT_END_NAMESPACE