Use "-march=native" when possible.

Recent versions of GCC have a tuning option value of 'native', which causes
the compiler to optimize the build for the CPU the compile is performed on.
Since most people are building Asterisk on the machine they plan to run it on,
the configure script and build system will now use this value unless a different
value is specified by the user in CFLAGS when the configure script is executed.
In addition, this value will be used for building the GSM and LPC10 codecs as
well, in preference to the logic that has been in their Makefiles forever to
optimize for certain types of CPUs.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@310332 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -223,9 +223,13 @@ ifneq ($(findstring BSD,$(OSARCH)),)
 endif
 
 ifeq ($(findstring -march,$(_ASTCFLAGS) $(ASTCFLAGS)),)
+  ifneq ($(AST_MARCH_NATIVE),)
+    _ASTCFLAGS+=$(AST_MARCH_NATIVE)
+  else
     ifneq ($(PROC),ultrasparc)
       _ASTCFLAGS+=$(shell if $(CC) -march=$(PROC) -S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-march=$(PROC)"; fi)
     endif
+  endif
 endif
 
 ifeq ($(PROC),ppc)
@@ -233,9 +237,11 @@ ifeq ($(PROC),ppc)
 endif
 
 ifeq ($(OSARCH),FreeBSD)
+  ifeq ($(findstring -march,$(_ASTCFLAGS) $(ASTCFLAGS)),)
     ifeq ($(PROC),i386)
       _ASTCFLAGS+=-march=i686
     endif
+  endif
   # -V is understood by BSD Make, not by GNU make.
   BSDVERSION=$(shell make -V OSVERSION -f /usr/share/mk/bsd.port.subdir.mk)
   _ASTCFLAGS+=$(shell if test $(BSDVERSION) -lt 500016 ; then echo "-D_THREAD_SAFE"; fi)

codecs/gsm/Makefile

@@ -45,28 +45,33 @@ ifeq ($(shell $(CC) -v 2>&1 | awk '/^gcc version/ { split($$3, v, "."); printf "
 OPTIMIZE=-O2
 endif
 
-ifeq (,$(findstring $(shell uname -s),Darwin SunOS))
+# If the compiler's '-march' flag has been specified already, then assume it's a value
+# that is what the user wants (or has been determined by the configure script). If not,
+# do some simple logic to set a decent value
+ifeq ($(findstring -march,$(_ASTCFLAGS) $(ASTCFLAGS)),)
+  ifeq (,$(findstring $(shell uname -s),Darwin SunOS))
     ifeq (,$(strip $(findstring $(PROC) ,"x86_64 amd64 ultrasparc sparc64 arm armv5b armeb ppc powerpc ppc64 ia64 s390 bfin mipsel mips ")))
       ifeq (,$(strip $(findstring $(shell uname -m) ,"ppc ppc64 alpha armv4l s390 ")))
         OPTIMIZE+=-march=$(PROC)
       endif
     endif
-else
+  else
     ifneq (,$(findstring $(OSARCH),Darwin))
       ifeq ($(shell /usr/bin/sw_vers -productVersion | cut -c1-4),10.6)
         # Snow Leopard reports i386, even though it's really x86_64
         OPTIMIZE+=-mtune=native
       endif
     endif
-endif
+  endif
 
-#The problem with sparc is the best stuff is in newer versions of gcc (post 3.0) only.
+  #The problem with sparc is the best stuff is in newer versions of gcc (post 3.0) only.
-#This works for even old (2.96) versions of gcc and provides a small boost either way.
+  #This works for even old (2.96) versions of gcc and provides a small boost either way.
-#A ultrasparc cpu is really v9 but the stock debian stable 3.0 gcc doesn't support it.
+  #A ultrasparc cpu is really v9 but the stock debian stable 3.0 gcc doesn't support it.
-#So we go lowest common available by gcc and go a step down, still a step up from
+  #So we go lowest common available by gcc and go a step down, still a step up from
-#the default as we now have a better instruction set to work with. - Belgarath
+  #the default as we now have a better instruction set to work with. - Belgarath
-ifeq ($(PROC),ultrasparc)
+  ifeq ($(PROC),ultrasparc)
-OPTIMIZE+=-mcpu=v8 -mtune=$(PROC) -O3 
+  OPTIMIZE+=-mcpu=v8 -mtune=$(PROC) -O3 
+  endif
 endif
 
 PG =

codecs/lpc10/Makefile

@@ -27,23 +27,28 @@ CFLAGS+= -fPIC -Wno-comment
 # fails miserably. Remove it for the time being.
 _ASTCFLAGS:=$(_ASTCFLAGS:-Werror=)
 
-#fix for PPC processors and ALPHA, And UltraSparc too
+# If the compiler's '-march' flag has been specified already, then assume it's a value
-ifneq ($(OSARCH),Darwin)
+# that is what the user wants (or has been determined by the configure script). If not,
+# do some simple logic to set a decent value
+ifeq ($(findstring -march,$(_ASTCFLAGS) $(ASTCFLAGS)),)
+  #fix for PPC processors and ALPHA, And UltraSparc too
+  ifneq ($(OSARCH),Darwin)
    ifneq ($(findstring BSD,${OSARCH}),BSD)
     ifneq ($(PROC),ppc)
      ifneq ($(PROC),x86_64)
       ifneq ($(PROC),alpha)
-#The problem with sparc is the best stuff is in newer versions of gcc (post 3.0) only.
+  #The problem with sparc is the best stuff is in newer versions of gcc (post 3.0) only.
-#This works for even old (2.96) versions of gcc and provides a small boost either way.
+  #This works for even old (2.96) versions of gcc and provides a small boost either way.
-#A ultrasparc cpu is really v9 but the stock debian stable 3.0 gcc doesn.t support it.
+  #A ultrasparc cpu is really v9 but the stock debian stable 3.0 gcc doesn.t support it.
-#So we go lowest common available by gcc and go a step down, still a step up from
+  #So we go lowest common available by gcc and go a step down, still a step up from
-#the default as we now have a better instruction set to work with. - Belgarath
+  #the default as we now have a better instruction set to work with. - Belgarath
        ifeq ($(PROC),ultrasparc)
           CFLAGS+= -mtune=$(PROC) -mcpu=v8 -O3 -fomit-frame-pointer
        else
         ifneq ($(OSARCH),SunOS)
          ifneq  ($(OSARCH),arm)
-#        CFLAGS+= -march=$(PROC)
+  #        CFLAGS+= -march=$(PROC)
+         endif
         endif
        endif
       endif

configure.ac

@@ -918,6 +918,16 @@ else
 fi
 AC_SUBST(AST_SHADOW_WARNINGS)
 
+AC_MSG_CHECKING(for -march=native)
+if $(${CC} -march=native -S -o /dev/null -xc /dev/null > /dev/null 2>&1); then
+	AC_MSG_RESULT(yes)
+	AST_MARCH_NATIVE="-march=native"
+else
+	AC_MSG_RESULT(no)
+	AST_MARCH_NATIVE=
+fi
+AC_SUBST(AST_MARCH_NATIVE)
+
 AC_MSG_CHECKING(for sysinfo)
 AC_LINK_IFELSE(
         AC_LANG_PROGRAM([#include <sys/sysinfo.h>],

makeopts.in

@@ -100,6 +100,7 @@ AST_DECLARATION_AFTER_STATEMENT=@AST_DECLARATION_AFTER_STATEMENT@
 AST_NO_STRICT_OVERFLOW=@AST_NO_STRICT_OVERFLOW@
 AST_SHADOW_WARNINGS=@AST_SHADOW_WARNINGS@
 AST_FORTIFY_SOURCE=@AST_FORTIFY_SOURCE@
+AST_MARCH_NATIVE=@AST_MARCH_NATIVE@
 
 ALSA_INCLUDE=@ALSA_INCLUDE@
 ALSA_LIB=@ALSA_LIB@