[LLVMbugs] [Bug 2251] New: request: enable gnatlink to use -emit-llvm when compiling the binder generated main

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2251

           Summary: request: enable gnatlink to use -emit-llvm when
                    compiling the binder generated main
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rodkay at dodo.com.au
                CC: llvmbugs at cs.uiuc.edu


Hi,

   When gnatmake is invoked with -emil-llvm, '-emit-llvm' is not recorded in
the ali file.The reason for this is that gnatmake passes an invisible -gnatez
argument to the compiler to indicate the end of the arguments that should be
placed in the ali file.  So gcc gets invoked something like this:

  gcc -emit-llvm -gnatez -c file.adb

However gcc rewrites -emit-llvm into -emit-llvm-bc if used with -c.
Actually what it apparently does is turn the -c into -emit-llvm-bc.

This gives

  gcc -gnatez -emit-llvm-bc file.adb

Since -emit-llvm-bc is now after the -gnatez, it is no longer placed
in the ali file.

This means (for example) that gnatlink will not use -emit-llvm when
compiling the binder generated main; and that gnatmake -s will always
think there is a switch mismatch and recompile every time.


cheers,
Rod.


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