build: add CMAKE_INSTALL_PREFIX length check (#2774)

Linux mandates a limit on the length of a command that may appear in
the "shebang" line of a script. In our internal environments, this
limit has been exceeded, causing ill-behaved builds.

Fail the build if the length of CMAKE_INSTALL_PREFIX exceeds the
127 character limit.

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>

CMakeLists.txt

@@ -77,6 +77,19 @@ if (OPAE_MINIMAL_BUILD)
     set(CMAKE_INSTALL_PREFIX "/usr" CACHE STRING "" FORCE)
 endif(OPAE_MINIMAL_BUILD)
 
+############################################################################
+## CMAKE_INSTALL_PREFIX check ##############################################
+############################################################################
+
+string(LENGTH ${CMAKE_INSTALL_PREFIX} INSTALL_PREFIX_LEN)
+if (${INSTALL_PREFIX_LEN} GREATER 127)
+    message(FATAL_ERROR "The length of CMAKE_INSTALL_PREFIX (${INSTALL_PREFIX_LEN})"
+                        " has exceeded a limit mandated by the Linux kernel"
+                        " regarding the length of a script shebang. As a result,"
+                        " the build has been stopped. Please choose a more suitable"
+                        " CMAKE_INSTALL_PREFIX and try again.")
+endif ()
+
 ############################################################################
 ## Other setup and dependencies ############################################
 ############################################################################