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

@@ -223,19 +223,25 @@ 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)
   _ASTCFLAGS+=-fsigned-char
 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

@@ -45,6 +45,10 @@ ifeq ($(shell $(CC) -v 2>&1 | awk '/^gcc version/ { split($$3, v, "."); printf "
 OPTIMIZE=-O2
 endif
 
+# 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 $(shell uname -m) ,"ppc ppc64 alpha armv4l s390 ")))
@@ -68,6 +72,7 @@ endif
   ifeq ($(PROC),ultrasparc)
   OPTIMIZE+=-mcpu=v8 -mtune=$(PROC) -O3 
   endif
+endif
 
 PG =
 #PG = -g -pg

codecs/lpc10/Makefile

@@ -27,6 +27,10 @@ CFLAGS+= -fPIC -Wno-comment
 # fails miserably. Remove it for the time being.
 _ASTCFLAGS:=$(_ASTCFLAGS:-Werror=)
 
+# 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) $(ASTCFLAGS)),)
   #fix for PPC processors and ALPHA, And UltraSparc too
   ifneq ($(OSARCH),Darwin)
    ifneq ($(findstring BSD,${OSARCH}),BSD)
@@ -52,6 +56,7 @@ ifneq ($(OSARCH),Darwin)
     endif
    endif
   endif
+endif
 
 LIB = $(LIB_TARGET_DIR)/liblpc10.a
 

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@