llvm dev - Aug 2018 - Error facing in llvm command line argument

Hi,

I was writing main.cpp file for command line argument . I am facing this
error:

error: ‘class llvm::Expected<std::unique_ptr<llvm::Module> >’ has no
member
named ‘getError’
   if (error_code ec = m.getError())

I do not which member does this expecting. Please suggest me steps. Here is
my source code.

------------------------------------------------------------
--------------------------------------
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <llvm/Support/Error.h>
#include <llvm/IRReader/IRReader.h>
using namespace llvm;
using namespace std;

static cl::opt<string> input(cl::Positional, cl::desc("Bitcode
file"),
cl::Required);

int main(int argc, char** argv)
{
    cl::ParseCommandLineOptions(argc, argv, "LLVM IR to Bytecode \n");
    LLVMContext context;

    ErrorOr<std::unique_ptr<MemoryBuffer>> mb
MemoryBuffer::getFile(input);
    if (error_code ec = mb.getError()) {
        errs() << ec.message();
        return -1;
    }

  Expected<std::unique_ptr<Module>>
m=parseBitcodeFile(mb->get()->getMemBufferRef(),
context);
  if (error_code ec = m.getError())
    {
        errs() << "Error reading bitcode: " <<
ec.message() << "\n";
        return -1;
    }

return 0;
}
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--------------------------------------------
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Hi Ratnesh,

you can find the API documentation of llvm::Expected here:
http://llvm.org/doxygen/classllvm_1_1Expected.html

Cheers,
Philip

On Fri, Aug 10, 2018 at 1:09 PM Ratnesh Tiwari via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> I was writing main.cpp file for command line argument . I am facing this
> error:
>
> error: ‘class llvm::Expected<std::unique_ptr<llvm::Module> >’
has no
> member named ‘getError’
>    if (error_code ec = m.getError())
>
> I do not which member does this expecting. Please suggest me steps. Here
> is my source code.
>
>
>
--------------------------------------------------------------------------------------------------
> #include "llvm/IR/LLVMContext.h"
> #include "llvm/IR/Module.h"
> #include "llvm/Support/CommandLine.h"
> #include "llvm/Support/ErrorOr.h"
> #include "llvm/Support/MemoryBuffer.h"
> #include "llvm/Support/raw_ostream.h"
> #include <llvm/Support/Error.h>
> #include <llvm/IRReader/IRReader.h>
> using namespace llvm;
> using namespace std;
>
> static cl::opt<string> input(cl::Positional, cl::desc("Bitcode
file"),
> cl::Required);
>
> int main(int argc, char** argv)
> {
>     cl::ParseCommandLineOptions(argc, argv, "LLVM IR to Bytecode
\n");
>     LLVMContext context;
>
>     ErrorOr<std::unique_ptr<MemoryBuffer>> mb >
MemoryBuffer::getFile(input);
>     if (error_code ec = mb.getError()) {
>         errs() << ec.message();
>         return -1;
>     }
>
>   Expected<std::unique_ptr<Module>>
> m=parseBitcodeFile(mb->get()->getMemBufferRef(), context);
>   if (error_code ec = m.getError())
>     {
>         errs() << "Error reading bitcode: " <<
ec.message() << "\n";
>         return -1;
>     }
>
> return 0;
> }
>
>
--------------------------------------------------------------------------------------------------------
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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