https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91025
Bug ID: 91025
Summary: cpp man page incorrectly describes -MD option
Product: gcc
Version: 7.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: srk31 at srcf dot ucam.org
Target Milestone: ---
The cpp manual page's description of the -MD option is incorrect. It would be
correct as a description of gcc's -MD option... indeed it is phrased in terms
of "if -MD is used in conjunction with -E" and "the driver", neither of which
makes sense when running cpp directly.
As far as I can tell, when running "cpp" the "without -E" semantics always
apply: if -o is given then its filename is used but with a ".d" suffix
substituted; otherwise, the same substitution is done but on the input
filename. In other words, "-o" never directly specifies the dependency output
file, whether or not "-E" is on the command line (unlike when running gcc).
I'm happy in principle to produce a patch... but haven't quite got my head
around how the man pages are generated (from the texinfo?).
