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From: "Wiles, Keith" <keith.wiles@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: Compiling files with .S with GCC
Thread-Index: AQHQgEF6Ax1RHJOTDUynRqCbVzLFXA==
Date: Sun, 26 Apr 2015 16:53:11 +0000
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Subject: [dpdk-dev] Compiling files with .S with GCC
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Hi All,

I noticed in my builds with foo.S file I would get a warning from the
compiler the foo_s.o.tmp linker file will not be used as the code is not
linked. A strange error and the foo_s.o file would not be created. In the
mk/internal/rte.compile-pre.mk we have the following

# command to assemble a .S file to generate an object
ifeq ($(USE_HOST),1)
S_TO_O =3D $(CPP) $(HOST_CPPFLAGS) $($(@)_CPPFLAGS) $(HOST_EXTRA_CPPFLAGS)
$< $(@).tmp && \
    $(HOSTAS) $(HOST_ASFLAGS) $($(@)_ASFLAGS) $(HOST_EXTRA_ASFLAGS) -o $@
$(@).tmp
S_TO_O_STR =3D $(subst ','\'',$(S_TO_O)) #'# fix syntax highlight
S_TO_O_DISP =3D  $(if $(V),"$(S_TO_O_STR)","  HOSTAS $(@)")
else
S_TO_O =3D $(CPP) $(CPPFLAGS) $($(@)_CPPFLAGS) $(EXTRA_CPPFLAGS) $< -o
$(@).tmp && \
    $(AS) $(ASFLAGS) $($(@)_ASFLAGS) $(EXTRA_ASFLAGS) -o $@ $(@).tmp
S_TO_O_STR =3D $(subst ','\'',$(S_TO_O)) #'# fix syntax highlight
S_TO_O_DISP =3D  $(if $(V),"$(S_TO_O_STR)","  AS $(@)")
endif

I had to change the above =8C.tmp=B9 strings to =8C.s=B9 to remove this war=
ning
and get the foo_s.o file created. Using the .s the file name becomes
foo_s.o.s


Did not try this with clang or any other compiler, but I expect we can
safely change the =8C.tmp=B9 to =8C.s=B9 IMO

Anyone else notice this problem?

Regards,
++Keith