[CMake] CHECK_C_COMPILER_FLAG doesn't work with -march=xlr option with a MIPS gcc cross compiler

[Mahendra Ladhe]

Hi,
  I've a CMakeLists.txt file as below.

CHECK_C_COMPILER_FLAG (-march=xlr FLAG_xlr)
CHECK_C_COMPILER_FLAG (-march=xlp FLAG_xlp)

cmake version is 2.8.4 on Linux RedHat 5.6

I'm using a gcc MIPS cross compiler. Using this cross compiler I'm able to compile
a simple C program using both -march=xlr and -march=xlp compiler options. 
The size of a.out differs with these two options.

But then I invoke cmake, I get the following.

-- Performing Test FLAG_xlr
-- Performing Test FLAG_xlr - Failed
-- Performing Test FLAG_xlp
-- Performing Test FLAG_xlp - Success

It says Test FLAG_xlr failed, but it shouldn't fail since the cross compiler does support
-march=xlr option.

Could someone please tell me if I'm missing anything here ?

Thank you,
Mahendra
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