[CMake] CMake compiler check failure

[Zhenyao Mo]

I got the following errors when CMake tests my compilers.  The problem is
that it seems CMake is checking /usr/bin/gcc, instead of the
/usr/bin/armv7a-cros-linux-gnueabi-gcc it should have checked.

I manually tried /usr/bin/armv7a-cros-linux-gnueabi-gcc, and it compiles
fine, and manually tried /usr/bin/gcc, it failed with the same errors as
below.

So why CMake identified the correct compiler
(armv7a-cros-linux-gnueabi-gcc), but when it checked the compiler (gcc), it
used the wrong one?

Thanks in advance for any help.

- Mo

---------------------------------------------------------------------------------------------------------
below is the error messages.
---------------------------------------------------------------------------------------------------------

-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
-- Check for working C compiler: /usr/bin/armv7a-cros-linux-gnueabi-gcc
-- Check for working C compiler: /usr/bin/armv7a-cros-linux-gnueabi-gcc --
broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:32
(MESSAGE):
  The C compiler "/usr/bin/armv7a-cros-linux-gnueabi-gcc" is not able to
  compile a simple test program.

  It fails with the following output:

   Change Dir:
/build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp



  Run Build Command:/usr/bin/gmake "cmTryCompileExec/fast"

  /usr/bin/gmake -f CMakeFiles/cmTryCompileExec.dir/build.make
  CMakeFiles/cmTryCompileExec.dir/build

  gmake[1]: Entering directory

`/build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp'


  /usr/bin/cmake -E cmake_progress_report

/build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp/CMakeFiles
  1

  Building C object CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o

  /usr/bin/gcc -O2 -pipe -march=armv7-a -mtune=cortex-a8 -mfpu=neon
  -mfloat-abi=softfp -I/build/arm-generic/usr/include/
  -I/build/arm-generic/include/ -o
  CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o -c

/build/arm-generic/tmp/portage/app-text/poppler-0.12.3-r3/work/poppler-0.12.3_build/CMakeFiles/CMakeTmp/testCCompiler.c
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