LLVM IR C++ API create anonymous global variable

Question

How can I create an anonymous global variable in LLVM IR C++ API?

I can create a named global variable as follows:

GlobalVariable *createGlobalVariable(
    Module *module,
    Type *type,
    std::string name
) {
    module->getOrInsertGlobal(name, type);
    return module->getNamedGlobal(name);
}

For example:

auto context = new LLVMContext();
auto module = new Module("Module", *context);

auto type = IntegerType::getInt32Ty(*context);
auto globalVariable = createGlobalVariable(
    module,
    type,
    "globalVariableName"
);
auto constantInt = ConstantInt::getIntegerValue(
    type, 
    APInt(32, 42)
);
globalVariable->setInitializer(constantInt);
module->dump();

It will generate:

; ModuleID = 'Module'
source_filename = "Module"

@globalVariableName = global i32 42

How can I create an anonymous global variable?

I would like to generate somethings like:

; ModuleID = 'Module'
source_filename = "Module"

@0 = global i32 42

@0 is a unique identifiers

Answer 1

In comment, @IlCapitano said that Pass "" as name

I try

auto context = new LLVMContext();
auto module = new Module("Module", *context);

auto type = IntegerType::getInt32Ty(*context);
auto constant = module->getOrInsertGlobal("", type);
module->dump();

It generates:

; ModuleID = 'Module'
source_filename = "Module"

@0 = external global i32

But if I set initializer, will be Segmentation fault

auto constant = module->getOrInsertGlobal("", type);
auto anonymousGlobalVariable = module->getNamedGlobal(constant->getName());
anonymousGlobalVariable->setInitializer(constantInt);
// -> Segmentation fault

The correct way is creating GlobalVariable by using constructor:

auto context = new LLVMContext();
auto module = new Module("Module", *context);

auto type = IntegerType::getInt32Ty(*context);
auto constantInt = ConstantInt::getIntegerValue(type, APInt(32, 42));
auto anonymousGlobalVariable = new GlobalVariable(
    *module, 
    type, 
    false, 
    GlobalValue::CommonLinkage, 
    constantInt, 
    ""
);
module->dump();

Nice

; ModuleID = 'Module'
source_filename = "Module"

@0 = common global i32 42