我想在MinGW-64 lljvm下編譯一個不太大的程序。但是我陷入了一個讓我瘋狂的錯誤。編譯錯誤:調用基類型構造函數時無效轉換
的代碼如下:
backend.h
class JVMWritter {
...
static char id;
...
};
backend.cpp
char JVMWriter::id = 0;
JVMWriter::JVMWriter(): FunctionPass(&id) {}
現在,FunctionPass聲明中Pass.h這樣的:
Pass.h
class FunctionPass {
...
explicit FunctionPass (char &pid) : <initialization here> {}
...
};
當我嘗試編譯,我不斷收到以下錯誤:
backend.cpp:39:16: error: invalid conversion from 'char*' to 'char' [-fpermissive]
FunctionPass(&JVMWriter::id), targetData(td), out(o), classname(cls), debug(dbg) {
^~~~~~~~~~
In file included from D:/dev/msys64/mingw64/include/llvm/IR/DataLayout.h:27:0,
from D:/dev/msys64/mingw64/include/llvm/IR/Module.h:20,
from D:/dev/msys64/mingw64/include/llvm/IR/PassManager.h:46,
from D:/dev/msys64/mingw64/include/llvm/Analysis/LoopInfo.h:47,
from backend.h:29,
from backend.cpp:23:
D:/dev/msys64/mingw64/include/llvm/Pass.h:300:12: note: initializing argument 1 of 'llvm::FunctionPass::FunctionPass(char&)'
explicit FunctionPass(char &pid) : Pass(PT_Function, pid) {}
^~~~~~~~~~~~
backend.cpp:39:16: error: cannot bind rvalue '(char)(& JVMWriter::id)' to 'char&'
FunctionPass(&JVMWriter::id), targetData(td), out(o), classname(cls), debug(dbg) {
^~~~~~~~~~
In file included from D:/dev/msys64/mingw64/include/llvm/Pass.h:388:0,
from D:/dev/msys64/mingw64/include/llvm/IR/DataLayout.h:27,
from D:/dev/msys64/mingw64/include/llvm/IR/Module.h:20,
from D:/dev/msys64/mingw64/include/llvm/IR/PassManager.h:46,
from D:/dev/msys64/mingw64/include/llvm/Analysis/LoopInfo.h:47,
from backend.h:29,
from backend.cpp:23:
D:/dev/msys64/mingw64/include/llvm/PassAnalysisSupport.h: In instantiation of 'llvm::AnalysisUsage& llvm::AnalysisUsage::addRequired() [with PassClass = llvm::LoopInfo]':
backend.cpp:52:27: required from here
D:/dev/msys64/mingw64/include/llvm/PassAnalysisSupport.h:61:39: error: 'ID' is not a member of 'llvm::LoopInfo'
return addRequiredID(PassClass::ID);
我明顯的問題:爲什麼是抱怨我在嘗試一個非有效轉換?我在這些片斷中看不到這樣的企圖。
謝謝。這確實是一個簡單的解決方案。我仍然是C++編程的初學者。 – AmazingWouldBeGreatBut