[CMake] find_library

[Chuck Atkins]

Hi Vania,

 find_library(SYSC_LIB systemc PATHS "${SYSTEMC_PATH}"
>               PATH_SUFFIXES lib-linux64 lib64-linux lib64-linux64)
>

In this first call, SYSTEMC_PATH is being dereferenced as a CMake
variable.  This works because in your invocation of CMake:

cmake -G "Unix Makefiles" -DSYSTEMC_PATH=$HOME/systemc-2.3.1/
>

You define the CMake variable with -D on the command line

 However, in your second call

>  find_library(SYSC_LIB systemc PATHS ENV SYSTEMC_PATH
>               PATH_SUFFIXES lib-linux64 lib64-linux lib64-linux64)
>

the PATHS ENV SYSTEMC_PATH arguments specify that SYSTEMC_PATH be
dereferenced as an environment variable, not a CMake variable.  This is
equivalent to PATHS "$ENV{SYSTEMC_PATH}"
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