Fix nasa#24 nasa#355, Add compile flag abstractions

Adds STRICT_NO_WARNINGS and OMIT_DEPRECATED
prep options for CI and as example build

cmake/sample_defs/targets.cmake

@@ -98,3 +98,28 @@ SET(TGT1_FILELIST cfe_es_startup.scr)
 #SET(TGT3_APPLIST sample_app ci_lab to_lab sch_lab)
 #SET(TGT3_FILELIST cfe_es_startup.scr)
 
+# Cache related environment variables
+# NOTE - requires distclean and re-"make prep" to change
+set(STRICT_NO_WARNINGS $ENV{STRICT_NO_WARNINGS} CACHE STRING "Enable strict warnings and Werror")
+set(OMIT_DEPRECATED $ENV{OMIT_DEPRECATED} CACHE STRING "Omit deperecated elements")
+
+# Helper definition to abstract strict compiler flags and
+# treat warnings as errors. Settings are not appropriate for every build
+# environment/target, targeted for CI and as an example set.
+if (STRICT_NO_WARNINGS)
+  message (STATUS "STRICT_NO_WARNINGS=true: Enforcing strict warnings and Werror")
+  add_definitions(-Wall -Werror -std=c99 -D_XOPEN_SOURCE=600 -pedantic -Wstrict-prototypes -Wcast-align -Wwrite-strings)
+else()
+  message (STATUS "STRICT_NO_WARNINGS=false: Not enforced")
+endif (STRICT_NO_WARNINGS)
+
+# Helper definition to abstract omitting deprecated elements,
+# allows for one setting in CI and used by projects
+if (OMIT_DEPRECATED)
+  message (STATUS "OMIT_DEPRECATED=true: Not including deprecated elements in build")
+  add_definitions(-DCFE_OMIT_DEPRECATED_6_6 -DOSAL_OMIT_DEPRECATED)
+else()
+  message (STATUS "OMIT_DEPRECATED=false: Deprecated elements included in build")
+endif (OMIT_DEPRECATED)
+
+