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build: simplify dtrace configuration

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The ability to pass libtool via $(CC) to dtrace and have it respect this
appears to be a feature that is only present in the systemtap version of
the tool.  In particular, FreeBSD (which seems to be using a copy of the
tool from Solaris) doesn't support this.

The result is that, with $(CC) ignored, and a .lo file specified in -o,
we get an ELF written to the .lo.

Instead of trying to have dtrace run libtool we can have libtool run
dtrace.  dtrace is really just a compiler that produces an object file
here, and it even understands -o, so libtool can make the appropriate
adjustments.

There appears to be some prior art for this approach.  A quick search
shows that at least QEMU is using this approach.  It also appears to
work on Linux with systemtap's dtrace and on FreeBSD.

This may regress cross-compilation because the dtrace command will have
no way of knowing which compiler we intend for it to use to produce the
object file.  I say "may" because I don't know if dtrace ever worked in
the first place under cross-compilation.

https://bugzilla.gnome.org/show_bug.cgi?id=725902
This commit is contained in:
Ryan Lortie 2014-03-07 09:35:16 -05:00 committed by Matthias Clasen
parent b990acf7ae
commit 7563ab4734
2 changed files with 2 additions and 7 deletions
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5
glib/Makefile.am
View File

@ -362,15 +362,12 @@ libglib_2_0_la_LDFLAGS = $(GLIB_LINK_FLAGS) \
INSTALL_PROGS=
if ENABLE_DTRACE
DTCOMPILE = $(patsubst -W%,,$(LTCOMPILE))
DTCFLAGS = $(patsubst -W%,,$(CFLAGS))
glib_probes.h: glib_probes.d
$(AM_V_GEN) $(DTRACE) -C -h -s $< -o $@.tmp
@$(SED) -e "s,define STAP_HAS_SEMAPHORES 1,undef STAP_HAS_SEMAPHORES," < $@.tmp > $@ && rm -f $@.tmp
glib_probes.lo: glib_probes.d
$(AM_V_GEN) env CC="$(DTCOMPILE)" CFLAGS="$(DTCFLAGS)" $(DTRACE) -G -s $< -o $@
$(AM_V_GEN) $(LIBTOOL) --mode=compile $(AM_V_lt) --tag=CC $(DTRACE) -G -s $< -o $@
BUILT_SOURCES += glib_probes.h glib_probes.lo
CLEANFILES += glib_probes.h glib_probes.h.tmp

4
gobject/Makefile.am
View File

@ -110,15 +110,13 @@ gobject_c_sources = \
gvaluetypes.c
if ENABLE_DTRACE
DTCOMPILE = $(patsubst -W%,,$(LTCOMPILE))
DTCFLAGS = $(patsubst -W%,,$(CFLAGS))
gobject_probes.h: gobject_probes.d
$(AM_V_GEN) $(DTRACE) -C -h -s $< -o $@.tmp
@$(SED) -e "s,define STAP_HAS_SEMAPHORES 1,undef STAP_HAS_SEMAPHORES," < $@.tmp > $@ && rm -f $@.tmp
gobject_probes.lo: gobject_probes.d
$(AM_V_GEN) env CC="$(DTCOMPILE)" CFLAGS="$(DTCFLAGS)" $(DTRACE) -G -s $< -o $@
$(AM_V_GEN) $(LIBTOOL) --mode=compile $(AM_V_lt) --tag=CC $(DTRACE) -G -s $< -o $@
BUILT_SOURCES += gobject_probes.h gobject_probes.lo
CLEANFILES += gobject_probes.h