Add QOperatingSystemVersion support for macOS Big Sur

Pick-to: 5.15
Pick-to: 5.12

Change-Id: Ide57f675b20b08210f301da5177df45d008423c4
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/corelib/kernel/qcore_mac.mm b/src/corelib/kernel/qcore_mac.mm
index 57d818ffd4..b94b06adb4 100644
--- a/src/corelib/kernel/qcore_mac.mm
+++ b/src/corelib/kernel/qcore_mac.mm
@@ -53,6 +53,7 @@
 #include <dlfcn.h>
 #include <cxxabi.h>
 #include <objc/runtime.h>
+#include <mach-o/dyld.h>
 
 #include <qdebug.h>
 
@@ -540,6 +541,88 @@ QT_BEGIN_NAMESPACE
 
 // -------------------------------------------------------------------------
 
+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)
+        );
+    };
+
+    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 || 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