http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54964
Bug #: 54964
Summary: -MMD is silently ignored with -x assembler (or
inferred language from .s extension)
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: a...@fischman.org
When gcc is asked to compile a .s into a .o, or when told to compile a language
"assembler" file, it ignores the request for a dependency file. -x
assembler-with-cpp emits the requested dependency file.
It would be nice if gcc never ignored the -MMD flag.
Repro: note the first two commands fail to create empty.o.d, whereas the last
command does not fail:
$ rm -f empty.o* ; touch empty.s ; gcc -MMD -MF empty.o.d -c empty.s -o empty.o
; ls -al empty.o*
-rw-r--r-- 1 fischman eng 657 Oct 17 17:04 empty.o
$ rm -f empty.o* ; gcc -MMD -MF empty.o.d -x assembler /dev/null -c -o empty.o
; ls -al empty.o*
-rw-r--r-- 1 fischman eng 657 Oct 17 16:56 empty.o
$ rm -f empty.o* ; gcc -MMD -MF empty.o.d -x assembler-with-cpp /dev/null -c -o
empty.o ; ls -al empty.o*
-rw-r--r-- 1 fischman eng 657 Oct 17 16:56 empty.o
-rw-r--r-- 1 fischman eng 19 Oct 17 16:56 empty.o.d
