[LLVMbugs] [Bug 11060] New: configure --target does not work

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11060

           Summary: configure --target does not work
           Product: Build scripts
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: autoconf
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: spop at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu, daniel at zuster.org


I tried to build a cross compiler configuring llvm with --host=x86
--target=arm.  The clang driver outputs x86 assembly and the only way
to output arm assembly is by specifying a -ccc-host-triple option.

It seems like clang decides to target the host machine by default, and
not the machine that has been specified on the configure line using
the --target option.  There are several places in clang that call
llvm::sys::getHostTriple() to initialize the *target* driver:

- lib/Frontend/CompilerInvocation.cpp: in ParseTargetArgs
- lib/Frontend/CreateInvocationFromCommandLine.cpp: in
clang::createInvocationFromCommandLine
- tools/driver/cc1as_main.cpp: in AssemblerInvocation::CreateFromArgs
- tools/driver/driver.cpp: in main
- examples/clang-interpreter/main.cpp: in main

In all these places I would suggest to replace the call to
llvm::sys::getHostTriple() with a call to a yet to be written function
llvm::sys::getDefaultTargetTriple() that would return the default
triple that we get from configure --target.

Comments are welcome on how to better fix this.

Thanks,
Sebastian Pop
--
Qualcomm Innovation Center, Inc is a member of Code Aurora Forum

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