AM_CFLAGS not included in translation unit compilation

[Mike Mattie]

Hello automake mailing list,

In a recent project I noticed that the individual compilation units do
not include AM_CFLAGS in the invocation of the compiler, however
when the program is constructed in the linking phase the AM_CFLAGS
variable is used. Is there a rational for this ? I would like
to place debugging (-g) in AM_CFLAGS and instead I am placing it in prog_CFLAGS.