[cfe-dev] Pass -fopenmp=libiomp5 flag to Libtooling front-end in clang3.6

[xiaohui chen]

this commands works:
mytool openmp.c  -- -Xclang -fopenmp=libiomp5

On Tue, Jan 13, 2015 at 3:55 PM, xiaohui chen <xchen198812 at gmail.com> wrote:

> hi there:
>
> My Clang  version is 3.6.
>
> i can use the following command to dump my OpenMP code:
>
> clang -cc1 -ast-dump openmp.c -fopenmp=libiomp5
>
> it works well(PS: I add dump support roughly) :
>
> OMPTaskDirective 0x8c3caa8 <line:6:9, col:17>
>       `-CapturedStmt 0x8c3c880 <line:7:1, line:11:1>
>         |-Capture byref Var 0x8bfb280 'k' 'char'
>         |-Capture byref Var 0x8bfb170 'd' 'int'
>         |-CapturedDecl 0x8c3c510 <<invalid sloc>> <invalid sloc>
>         | `-ImplicitParamDecl 0x8c3c5a0 <line:6:9> col:9 implicit
> __context 'struct (anonymous at openmp.c:6:9) *'
>         |-CompoundStmt 0x8c3c858 <line:7:1, line:11:1>
>         | |-BinaryOperator 0x8c3c708 <line:8:1, col:3> 'char' '='
>         | | |-DeclRefExpr 0x8c3c628 <col:1> 'char' lvalue Var 0x8bfb280
> 'k' 'char'
>         | | `-ImplicitCastExpr 0x8c3c6f0 <col:3> 'char' <IntegralCast>
>         | |   `-IntegerLiteral 0x8c3c6d0 <col:3> 'int' 0
>         | `-BinaryOperator 0x8c3c830 <line:9:1, col:3> 'int' '='
>         |   |-DeclRefExpr 0x8c3c758 <col:1> 'int' lvalue Var 0x8bfb170 'd'
> 'int'
>         |   `-IntegerLiteral 0x8c3c810 <col:3> 'int' 0
>         |-DeclRefExpr 0x8c3c6a8 <line:8:1> 'char' lvalue Var 0x8bfb280 'k'
> 'char'
>         `-DeclRefExpr 0x8c3c7e8 <line:9:1> 'int' lvalue Var 0x8bfb170 'd'
> 'int'
>
> i wrote a source-to-source tool using Libtooling, and i want to pass
> -fopenmp=libiomp5 flag to the tool in this way:
>
> mytool openmp.c  --  -fopenmp=libiomp5
>
> it does not work, -fopenmp=libiomp5 is not received by the front-end, see
> the output:
>
> warning: argument unused during compilation: '-fopenmp=libiomp5'
> `-CompoundStmt 0x33d69b8 <line:7:1, line:11:1>
>       |-BinaryOperator 0x33957d8 <line:8:1, col:3> 'char' '='
>       | |-DeclRefExpr 0x3395778 <col:1> 'char' lvalue Var 0x33956f0 'k'
> 'char'
>       | `-ImplicitCastExpr 0x33957c0 <col:3> 'char' <IntegralCast>
>       |   `-IntegerLiteral 0x33957a0 <col:3> 'int' 0
>       `-BinaryOperator 0x33d6990 <line:9:1, col:3> 'int' '='
>         |-DeclRefExpr 0x3395800 <col:1> 'int' lvalue Var 0x33955e0 'd'
> 'int'
>         `-IntegerLiteral 0x33d6970 <col:3> 'int' 0
>
> , what is the right way to pass fopenmp=libiomp5 to the frontend?
>
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