Patchwork Add silent Makefile rules

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Submitter Simon Marchi
Date March 2, 2018, 8:20 p.m.
Message ID <1520022036-28308-1-git-send-email-simon.marchi@ericsson.com>
Download mbox | patch
Permalink /patch/26164/
State New
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Comments

Simon Marchi - March 2, 2018, 8:20 p.m.
From: Simon Marchi <simon.marchi@polymtl.ca>

Many projects (e.g. the Linux kernel) and build systems use "silent"
rules, which means that they'll only print a summary of what's being
done instead of printing all the detailed command lines.  While chatting
on the #gdb IRC channel, I realized a few people (including me) thought
it would be nice to have it in GDB too.

The idea is that too much text is not useful, the important information
gets lost.  If there's only the essential information, it's more likely
to be useful.  Most of the time, when I look at the build output, it's
to see how it's progressing.  By just printing a brief summary of each
operation, I can easily spot what's currently being compiled and
therefore how the build progresses (with time you know the order in
which files are compiled almost by heart).

As with other projects (Linux, automake-based things, probably others),
it's possible to print the complete command lines by passing V=1 to make
(or any other non-zero value).

I had one hesitation about this: when people report build failures, we
are more likely to miss the full compile command line.  We'll probably
sometimes need to ask people to include the build log with "make V=1".
I don't think it's a big downside, if other projects the size of the
Linux kernel can live with it, I'm sure we can too.

gdb/ChangeLog:

	* silent-rules.mk: New.
	* Makefile.in: Include silent-rules.mk
	(srcdir, VPATH, top_srcdir): Move up.
	(COMPILE): Add ECHO_CC.
	(test-cp-name-parser$(EXEEXT)): Add ECHO_LD.
	(init.c): Add ECHO_INIT_C.
	(gdb$(EXEEXT)): Add SILENCE and ECHO_LD.
	(version.c): Add ECHO_GEN.
	(printcmd.o): Add ECHO_CC.
	(target-float.o): Add ECHO_CC.
	(ada-exp.o): Add ECHO_CC.
	(stamp-xml): Add SILENCE and ECHO_GEN_XML_BUILTIN.
	(insight$(EXEEXT)): Add ECHO_LD.

gdb/testsuite/ChangeLog:

	* Makefile.in: Include silent-rules.mk.
	(srcdir, abs_top_srcdir, abs_srcdir, VPATH): Move up.
	(COMPILE): Add ECHO_CC.
	(gdbserver$(EXEEXT)): Add SILENCE and ECHO_LD.
	(gdbreplay$(EXEEXT)): Add SILENCE and ECHO_LD.
	($(IPA_LIB)): Add SILENCE and ECHO_LD.
	(version-generated.c): Add ECHO_GEN.
	(stamp-xml): Add SILENCE and ECHO_GEN_XML_BUILTIN_GENERATED.
	(IPAGENT_COMPILE): Add ECHO_CC.
	(%-generated.c): Add ECHO_REGDAT.
---
 gdb/Makefile.in           | 48 ++++++++++++++++++++-----------------
 gdb/gdbserver/Makefile.in | 60 ++++++++++++++++++++++++++---------------------
 gdb/silent-rules.mk       | 14 +++++++++++
 3 files changed, 73 insertions(+), 49 deletions(-)
 create mode 100644 gdb/silent-rules.mk
Simon Marchi - March 2, 2018, 8:25 p.m.
On 2018-03-02 03:20 PM, Simon Marchi wrote:
> From: Simon Marchi <simon.marchi@polymtl.ca>
> 
> Many projects (e.g. the Linux kernel) and build systems use "silent"
> rules, which means that they'll only print a summary of what's being
> done instead of printing all the detailed command lines.  While chatting
> on the #gdb IRC channel, I realized a few people (including me) thought
> it would be nice to have it in GDB too.
> 
> The idea is that too much text is not useful, the important information
> gets lost.  If there's only the essential information, it's more likely
> to be useful.  Most of the time, when I look at the build output, it's
> to see how it's progressing.  By just printing a brief summary of each
> operation, I can easily spot what's currently being compiled and
> therefore how the build progresses (with time you know the order in
> which files are compiled almost by heart).
> 
> As with other projects (Linux, automake-based things, probably others),
> it's possible to print the complete command lines by passing V=1 to make
> (or any other non-zero value).
> 
> I had one hesitation about this: when people report build failures, we
> are more likely to miss the full compile command line.  We'll probably
> sometimes need to ask people to include the build log with "make V=1".
> I don't think it's a big downside, if other projects the size of the
> Linux kernel can live with it, I'm sure we can too.

I realized it might be useful to include an example of the resulting
output.  Here's a what a gdb/gdbserver build looks like:

https://pastebin.com/raw/CsqMfi0Q

The gnulib/libiberty builds are still verbose, but we have no control
over that (until we contribute a silent mode to those projects too).

Simon
Eli Zaretskii - March 3, 2018, 7:54 a.m.
> From: Simon Marchi <simon.marchi@ericsson.com>
> CC: Simon Marchi <simon.marchi@polymtl.ca>
> Date: Fri, 2 Mar 2018 15:20:36 -0500
> --- /dev/null
> +++ b/gdb/silent-rules.mk
> @@ -0,0 +1,14 @@
> +# If V is undefined or V=0 is specified, use the silent/verbose/compact mode.
> +V ?= 0
> +ifeq ($(V),0)
> +ECHO_CC =     @echo "  CC      $@";
> +ECHO_LD =     @echo "  LD      $@";
> +ECHO_REGDAT = @echo "  REGDAT  $@";
> +ECHO_GEN =    @echo "  GEN     $@";
> +ECHO_GEN_XML_BUILTIN = \
> +              @echo "  GEN     xml-builtin.c";
> +ECHO_GEN_XML_BUILTIN_GENERATED = \
> +              @echo "  GEN     xml-builtin-generated.c";
> +ECHO_INIT_C =  echo "  GEN     init.c" ||
> +SILENCE = @
> +endif

I think most projects I've seen use "CCLD" instead of "LD" when
announcing linking of a C program.

Maybe we should use CXX and CXXLD to indicate a C++ compilation/link.

Thanks.
Eli Zaretskii - March 3, 2018, 8:09 a.m.
> From: Simon Marchi <simon.marchi@ericsson.com>
> CC: Simon Marchi <simon.marchi@polymtl.ca>
> Date: Fri, 2 Mar 2018 15:25:16 -0500
> 
> The gnulib/libiberty builds are still verbose, but we have no control
> over that (until we contribute a silent mode to those projects too).

??? Isn't gnulib/Makefile.in our file?  If so, we can add there
anything we want, including the macros you defined in
gdb/Makefile.in.  Right?
Simon Marchi - March 3, 2018, 2:39 p.m.
On 2018-03-03 02:54 AM, Eli Zaretskii wrote:
>> From: Simon Marchi <simon.marchi@ericsson.com>
>> CC: Simon Marchi <simon.marchi@polymtl.ca>
>> Date: Fri, 2 Mar 2018 15:20:36 -0500
>> --- /dev/null
>> +++ b/gdb/silent-rules.mk
>> @@ -0,0 +1,14 @@
>> +# If V is undefined or V=0 is specified, use the silent/verbose/compact mode.
>> +V ?= 0
>> +ifeq ($(V),0)
>> +ECHO_CC =     @echo "  CC      $@";
>> +ECHO_LD =     @echo "  LD      $@";
>> +ECHO_REGDAT = @echo "  REGDAT  $@";
>> +ECHO_GEN =    @echo "  GEN     $@";
>> +ECHO_GEN_XML_BUILTIN = \
>> +              @echo "  GEN     xml-builtin.c";
>> +ECHO_GEN_XML_BUILTIN_GENERATED = \
>> +              @echo "  GEN     xml-builtin-generated.c";
>> +ECHO_INIT_C =  echo "  GEN     init.c" ||
>> +SILENCE = @
>> +endif
> 
> I think most projects I've seen use "CCLD" instead of "LD" when
> announcing linking of a C program.
> 
> Maybe we should use CXX and CXXLD to indicate a C++ compilation/link.

Good idea, thanks.

Simon
Simon Marchi - March 3, 2018, 6:05 p.m.
On 2018-03-03 03:09 AM, Eli Zaretskii wrote:
>> From: Simon Marchi <simon.marchi@ericsson.com>
>> CC: Simon Marchi <simon.marchi@polymtl.ca>
>> Date: Fri, 2 Mar 2018 15:25:16 -0500
>>
>> The gnulib/libiberty builds are still verbose, but we have no control
>> over that (until we contribute a silent mode to those projects too).
> 
> ??? Isn't gnulib/Makefile.in our file?  If so, we can add there
> anything we want, including the macros you defined in
> gdb/Makefile.in.  Right?
> 

Ah, you're right, I didn't think we have that much control over how gnulib
is build.  Actually, it uses automake, so we just need to enable its silent
mode in gnulib/configure.ac (which is also our file).  I'll post an updated
patch soon.

Thanks,

Simon

Patch

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 19be64f..c7cf1db 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -112,18 +112,20 @@  DEPMODE = @CCDEPMODE@
 DEPDIR = @DEPDIR@
 depcomp = $(SHELL) $(srcdir)/../depcomp
 
+# Directory containing source files.
+srcdir = @srcdir@
+VPATH = @srcdir@
+top_srcdir = @top_srcdir@
+
+include $(srcdir)/silent-rules.mk
+
 # Note that these are overridden by GNU make-specific code below if
 # GNU make is used.  The overrides implement dependency tracking.
 COMPILE.pre = $(CXX) -x c++ $(CXX_DIALECT)
 COMPILE.post = -c -o $@
-COMPILE = $(COMPILE.pre) $(INTERNAL_CFLAGS) $(COMPILE.post)
+COMPILE = $(ECHO_CC) $(COMPILE.pre) $(INTERNAL_CFLAGS) $(COMPILE.post)
 POSTCOMPILE = @true
 
-# Directory containing source files.
-srcdir = @srcdir@
-VPATH = @srcdir@
-top_srcdir = @top_srcdir@
-
 YACC = @YACC@
 
 # This is used to rebuild ada-lex.c from ada-lex.l.  If the program is
@@ -1794,7 +1796,7 @@  test-cp-name-parser.o: cp-name-parser.c
 	$(POSTCOMPILE)
 
 test-cp-name-parser$(EXEEXT): test-cp-name-parser.o $(LIBIBERTY)
-	$(CC_LD) $(INTERNAL_LDFLAGS) -o test-cp-name-parser$(EXEEXT) \
+	$(ECHO_LD) $(CC_LD) $(INTERNAL_LDFLAGS) -o test-cp-name-parser$(EXEEXT) \
 		test-cp-name-parser.o $(LIBIBERTY)
 
 # We do this by grepping through sources.  If that turns out to be too slow,
@@ -1836,7 +1838,7 @@  test-cp-name-parser$(EXEEXT): test-cp-name-parser.o $(LIBIBERTY)
 
 INIT_FILES = $(COMMON_OBS) $(TSOBS) $(CONFIG_SRCS) $(SUBDIR_GCC_COMPILE_SRCS)
 init.c: $(INIT_FILES)
-	@echo Making init.c
+	@$(ECHO_INIT_C) echo "Making init.c"
 	@rm -f init.c-tmp init.l-tmp
 	@touch init.c-tmp
 	@echo gdbtypes > init.l-tmp
@@ -1896,8 +1898,8 @@  libgdb.a: $(LIBGDB_OBS)
 
 # Removing the old gdb first works better if it is running, at least on SunOS.
 gdb$(EXEEXT): gdb.o $(LIBGDB_OBS) $(ADD_DEPS) $(CDEPS) $(TDEPLIBS)
-	rm -f gdb$(EXEEXT)
-	$(CC_LD) $(INTERNAL_LDFLAGS) $(WIN32LDAPP) \
+	$(SILENCE) rm -f gdb$(EXEEXT)
+	$(ECHO_LD) $(CC_LD) $(INTERNAL_LDFLAGS) $(WIN32LDAPP) \
 		-o gdb$(EXEEXT) gdb.o $(LIBGDB_OBS) \
 		$(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
 
@@ -2128,7 +2130,7 @@  $(srcdir)/copying.c: @MAINTAINER_MODE_TRUE@ $(srcdir)/../COPYING3 $(srcdir)/copy
 	mv $(srcdir)/copying.tmp $(srcdir)/copying.c
 
 version.c: Makefile version.in $(srcdir)/../bfd/version.h $(srcdir)/common/create-version.sh
-	$(SHELL) $(srcdir)/common/create-version.sh $(srcdir) \
+	$(ECHO_GEN) $(SHELL) $(srcdir)/common/create-version.sh $(srcdir) \
 	    $(host_alias) $(target_alias) version.c
 
 observer.h: observer.sh doc/observer.texi
@@ -2373,14 +2375,16 @@  ALLDEPFILES = \
 # Do not try to build "printcmd.c" with -Wformat-nonliteral.  It manually
 # checks format strings.
 printcmd.o: $(srcdir)/printcmd.c
-	$(COMPILE.pre) $(INTERNAL_CFLAGS) $(GDB_WARN_CFLAGS_NO_FORMAT) \
-		$(COMPILE.post) $(srcdir)/printcmd.c
+	$(ECHO_CC) $(COMPILE.pre) $(INTERNAL_CFLAGS) \
+		$(GDB_WARN_CFLAGS_NO_FORMAT) $(COMPILE.post) \
+		$(srcdir)/printcmd.c
 	$(POSTCOMPILE)
 
 # Same for "target-float.c".
 target-float.o: $(srcdir)/target-float.c
-	$(COMPILE.pre) $(INTERNAL_CFLAGS) $(GDB_WARN_CFLAGS_NO_FORMAT) \
-		$(COMPILE.post) $(srcdir)/target-float.c
+	$(ECHO_CC) $(COMPILE.pre) $(INTERNAL_CFLAGS) \
+		$(GDB_WARN_CFLAGS_NO_FORMAT) $(COMPILE.post) \
+		$(srcdir)/target-float.c
 
 # ada-exp.c can appear in srcdir, for releases; or in ., for
 # development builds.
@@ -2389,8 +2393,8 @@  ADA_EXP_C = `if test -f ada-exp.c; then echo ada-exp.c; else echo $(srcdir)/ada-
 # Some versions of flex give output that triggers
 # -Wold-style-definition.
 ada-exp.o: ada-exp.c
-	$(COMPILE.pre) $(INTERNAL_CFLAGS) $(GDB_WARN_CFLAGS_NO_DEFS) \
-		$(COMPILE.post) $(ADA_EXP_C)
+	$(ECHO_CC) $(COMPILE.pre) $(INTERNAL_CFLAGS) \
+		$(GDB_WARN_CFLAGS_NO_DEFS) $(COMPILE.post) $(ADA_EXP_C)
 	$(POSTCOMPILE)
 
 # Message files.  Based on code in gcc/Makefile.in.
@@ -2521,12 +2525,12 @@  po/$(PACKAGE).pot: force
 
 xml-builtin.c: stamp-xml; @true
 stamp-xml: $(srcdir)/features/feature_to_c.sh Makefile $(XMLFILES)
-	rm -f xml-builtin.tmp
-	AWK="$(AWK)" \
+	$(SILENCE) rm -f xml-builtin.tmp
+	$(ECHO_GEN_XML_BUILTIN) AWK="$(AWK)" \
 	  $(SHELL) $(srcdir)/features/feature_to_c.sh \
 	  xml-builtin.tmp $(XMLFILES)
-	$(SHELL) $(srcdir)/../move-if-change xml-builtin.tmp xml-builtin.c
-	echo stamp > stamp-xml
+	$(SILENCE) $(SHELL) $(srcdir)/../move-if-change xml-builtin.tmp xml-builtin.c
+	$(SILENCE) echo stamp > stamp-xml
 
 .PRECIOUS: xml-builtin.c
 
@@ -2584,7 +2588,7 @@  clean-gdbtk:
 insight$(EXEEXT): gdbtk-main.o libgdb.a $(ADD_DEPS) \
 		$(CDEPS) $(TDEPLIBS)
 	rm -f insight$(EXEEXT)
-	$(CC_LD) $(INTERNAL_LDFLAGS) $(WIN32LDAPP) \
+	$(ECHO_LD) $(CC_LD) $(INTERNAL_LDFLAGS) $(WIN32LDAPP) \
 		-o insight$(EXEEXT) gdbtk-main.o libgdb.a \
 		$(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
 
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index f293692..0cb6b9b 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -64,13 +64,6 @@  DEPMODE = @CCDEPMODE@
 DEPDIR = @DEPDIR@
 depcomp = $(SHELL) $(srcdir)/../depcomp
 
-# Note that these are overridden by GNU make-specific code below if
-# GNU make is used.  The overrides implement dependency tracking.
-COMPILE.pre = $(CXX) -x c++ $(CXX_DIALECT)
-COMPILE.post = -c -o $@
-COMPILE = $(COMPILE.pre) $(INTERNAL_CFLAGS) $(COMPILE.post)
-POSTCOMPILE = @true
-
 # Directory containing source files.  Don't clean up the spacing,
 # this exact string is matched for by the "configure" script.
 srcdir = @srcdir@
@@ -78,6 +71,15 @@  abs_top_srcdir = @abs_top_srcdir@
 abs_srcdir = @abs_srcdir@
 VPATH = @srcdir@
 
+include $(srcdir)/../silent-rules.mk
+
+# Note that these are overridden by GNU make-specific code below if
+# GNU make is used.  The overrides implement dependency tracking.
+COMPILE.pre = $(CXX) -x c++ $(CXX_DIALECT)
+COMPILE.post = -c -o $@
+COMPILE = $(ECHO_CC) $(COMPILE.pre) $(INTERNAL_CFLAGS) $(COMPILE.post)
+POSTCOMPILE = @true
+
 # It is also possible that you will need to add -I/usr/include/sys to the
 # CFLAGS section if your system doesn't have fcntl.h in /usr/include (which
 # is where it should be according to Posix).
@@ -378,9 +380,10 @@  clean-info: force
 	@$(MAKE) $(FLAGS_TO_PASS) DO=$@ "DODIRS=$(SUBDIRS)" subdir_do
 
 gdbserver$(EXEEXT): $(OBS) ${ADD_DEPS} ${CDEPS} $(LIBGNU) $(LIBIBERTY)
-	rm -f gdbserver$(EXEEXT)
-	$(CC_LD) $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) -o gdbserver$(EXEEXT) $(OBS) \
-	$(LIBGNU) $(LIBIBERTY) $(GDBSERVER_LIBS) $(XM_CLIBS)
+	$(SILENCE) rm -f gdbserver$(EXEEXT)
+	$(ECHO_LD) $(CC_LD) $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) \
+		-o gdbserver$(EXEEXT) $(OBS) $(LIBGNU) $(LIBIBERTY) \
+		$(GDBSERVER_LIBS) $(XM_CLIBS)
 
 $(LIBGNU) $(LIBIBERTY) $(GNULIB_H): all-lib
 all-lib: $(GNULIB_BUILDDIR)/Makefile $(LIBIBERTY_BUILDDIR)/Makefile
@@ -388,9 +391,10 @@  all-lib: $(GNULIB_BUILDDIR)/Makefile $(LIBIBERTY_BUILDDIR)/Makefile
 .PHONY: all-lib
 
 gdbreplay$(EXEEXT): $(GDBREPLAY_OBS) $(LIBGNU) $(LIBIBERTY)
-	rm -f gdbreplay$(EXEEXT)
-	$(CC_LD) $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) -o gdbreplay$(EXEEXT) $(GDBREPLAY_OBS) \
-	  $(XM_CLIBS) $(LIBGNU) $(LIBIBERTY)
+	$(SILENCE) rm -f gdbreplay$(EXEEXT)
+	$(ECHO_LD) $(CC_LD) $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) \
+		-o gdbreplay$(EXEEXT) $(GDBREPLAY_OBS) $(XM_CLIBS) $(LIBGNU) \
+		$(LIBIBERTY)
 
 IPA_OBJS = \
 	ax-ipa.o \
@@ -410,9 +414,10 @@  IPA_OBJS = \
 IPA_LIB = libinproctrace.so
 
 $(IPA_LIB): $(IPA_OBJS) ${ADD_DEPS} ${CDEPS}
-	rm -f $(IPA_LIB)
-	$(CC_LD) -shared -fPIC -Wl,--soname=$(IPA_LIB) -Wl,--no-undefined $(INTERNAL_CFLAGS) \
-	$(INTERNAL_LDFLAGS) -o $(IPA_LIB) ${IPA_OBJS} -ldl -pthread
+	$(SILENCE) rm -f $(IPA_LIB)
+	$(ECHO_LD) $(CC_LD) -shared -fPIC -Wl,--soname=$(IPA_LIB) \
+		-Wl,--no-undefined $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) \
+		-o $(IPA_LIB) ${IPA_OBJS} -ldl -pthread
 
 # Put the proper machine-specific files first, so M-. on a machine
 # specific routine gets the one for the correct machine.
@@ -494,15 +499,16 @@  am--refresh:
 force:
 
 version-generated.c: Makefile $(srcdir)/../version.in $(srcdir)/../../bfd/version.h $(srcdir)/../common/create-version.sh
-	$(SHELL) $(srcdir)/../common/create-version.sh $(srcdir)/.. \
-	    $(host_alias) $(target_alias) $@
+	$(ECHO_GEN) $(SHELL) $(srcdir)/../common/create-version.sh $(srcdir)/.. \
+		$(host_alias) $(target_alias) $@
 
 xml-builtin-generated.c: stamp-xml; @true
 stamp-xml: $(XML_DIR)/feature_to_c.sh Makefile $(XML_FILES)
-	rm -f xml-builtin.tmp
-	$(SHELL) $(XML_DIR)/feature_to_c.sh xml-builtin.tmp $(XML_FILES)
-	$(SHELL) $(srcdir)/../../move-if-change xml-builtin.tmp xml-builtin-generated.c
-	echo stamp > stamp-xml
+	$(SILENCE) rm -f xml-builtin.tmp
+	$(ECHO_GEN_XML_BUILTIN_GENERATED) $(SHELL) $(XML_DIR)/feature_to_c.sh \
+		xml-builtin.tmp $(XML_FILES)
+	$(SILENCE) $(SHELL) $(srcdir)/../../move-if-change xml-builtin.tmp xml-builtin-generated.c
+	$(SILENCE) echo stamp > stamp-xml
 
 .PRECIOUS: xml-builtin.c
 
@@ -527,7 +533,7 @@  IPAGENT_CFLAGS = $(INTERNAL_CFLAGS) $(UST_CFLAGS) \
 	-fPIC -DIN_PROCESS_AGENT \
 	-fvisibility=hidden
 
-IPAGENT_COMPILE = $(COMPILE.pre) $(IPAGENT_CFLAGS) $(COMPILE.post)
+IPAGENT_COMPILE = $(ECHO_CC) $(COMPILE.pre) $(IPAGENT_CFLAGS) $(COMPILE.post)
 
 # Rules for special cases.
 
@@ -598,16 +604,16 @@  common/%.o: ../common/%.c
 # -generated to identify and clean them easily.
 
 %-generated.c: ../regformats/%.dat | $(regdat_sh)
-	$(SHELL) $(regdat_sh) $< $@
+	$(ECHO_REGDAT) $(SHELL) $(regdat_sh) $< $@
 
 %-generated.c: ../regformats/arm/%.dat | $(regdat_sh)
-	$(SHELL) $(regdat_sh) $< $@
+	$(ECHO_REGDAT) $(SHELL) $(regdat_sh) $< $@
 
 %-generated.c: ../regformats/i386/%.dat | $(regdat_sh)
-	$(SHELL) $(regdat_sh) $< $@
+	$(ECHO_REGDAT) $(SHELL) $(regdat_sh) $< $@
 
 %-generated.c: ../regformats/rs6000/%.dat | $(regdat_sh)
-	$(SHELL) $(regdat_sh) $< $@
+	$(ECHO_REGDAT) $(SHELL) $(regdat_sh) $< $@
 
 #
 # Dependency tracking.
diff --git a/gdb/silent-rules.mk b/gdb/silent-rules.mk
new file mode 100644
index 0000000..d2715ad
--- /dev/null
+++ b/gdb/silent-rules.mk
@@ -0,0 +1,14 @@ 
+# If V is undefined or V=0 is specified, use the silent/verbose/compact mode.
+V ?= 0
+ifeq ($(V),0)
+ECHO_CC =     @echo "  CC      $@";
+ECHO_LD =     @echo "  LD      $@";
+ECHO_REGDAT = @echo "  REGDAT  $@";
+ECHO_GEN =    @echo "  GEN     $@";
+ECHO_GEN_XML_BUILTIN = \
+              @echo "  GEN     xml-builtin.c";
+ECHO_GEN_XML_BUILTIN_GENERATED = \
+              @echo "  GEN     xml-builtin-generated.c";
+ECHO_INIT_C =  echo "  GEN     init.c" ||
+SILENCE = @
+endif