Calls to constructors of interdependent library instances are generated in
the correct order only if all library instances in question have
constructors. If some have no constructors, then the rest may see their
constructors called out of order.

Cycle detection also only works when all library instances have
constructors.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <[email protected]>
---
 OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf |  2 ++
 OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c      | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf 
b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
index a2b72ba..a28534b 100644
--- a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
+++ b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
@@ -20,6 +20,8 @@
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = PlatformBdsLib|DXE_DRIVER
 
+  CONSTRUCTOR                    = PlatformBdsLibConstructor
+
 #
 # The following information is for reference only and not required by the 
build tools.
 #
diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c 
b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
index 2a1ca88..3a70799 100644
--- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
@@ -1447,3 +1447,13 @@ LockKeyboards (
     return EFI_UNSUPPORTED;
 }
 
+
+EFI_STATUS
+EFIAPI
+PlatformBdsLibConstructor (
+  IN EFI_HANDLE       ImageHandle,
+  IN EFI_SYSTEM_TABLE *SystemTable
+  )
+{
+  return EFI_SUCCESS;
+}
-- 
1.8.3.1



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