[clang codegen] avoid to crash when emit init func for global variable with flexible array init (#113336)

Fixes: #113187
Avoid to create init function since clang does not support global
variable with flexible array init.
It will cause assertion failure later.

1 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 24655b8..2bcca5e 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -5529,12 +5529,14 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
         T = D->getType();
 
       if (getLangOpts().CPlusPlus) {
-        if (InitDecl->hasFlexibleArrayInit(getContext()))
-          ErrorUnsupported(D, "flexible array initializer");
         Init = EmitNullConstant(T);
-
         if (!IsDefinitionAvailableExternally)
           NeedsGlobalCtor = true;
+        if (InitDecl->hasFlexibleArrayInit(getContext())) {
+          ErrorUnsupported(D, "flexible array initializer");
+          // We cannot create ctor for flexible array initializer
+          NeedsGlobalCtor = false;
+        }
       } else {
         ErrorUnsupported(D, "static initializer");
         Init = llvm::UndefValue::get(getTypes().ConvertType(T));