Unify target_cpu handling

Over the years several slightly different approaches were used
in the Makefiles to determine the target architecture.  This
change updates both the build system and Makefile to handle
this in a consistent fashion.

TARGET_CPU is set to i386, x86_64, powerpc, aarch6 or sparc64
and made available in the Makefiles to be used as appropriate.

Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9848

config/always-arch.m4

@@ -1,22 +1,41 @@
 dnl #
-dnl # Set the target arch for libspl atomic implementation and the icp
+dnl # Set the target cpu architecture.  This allows the
+dnl # following syntax to be used in a Makefile.am.
+dnl #
+dnl # ifeq ($(TARGET_CPU),x86_64)
+dnl # ...
+dnl # endif
+dnl #
+dnl # if TARGET_CPU_POWERPC
+dnl # ...
+dnl # else
+dnl # ...
+dnl # endif
 dnl #
 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_ARCH], [
-	AC_MSG_CHECKING(for target asm dir)
-	TARGET_ARCH=`echo ${target_cpu} | sed -e s/i.86/i386/`
-
-	case $TARGET_ARCH in
-	i386|x86_64)
-		TARGET_ASM_DIR=asm-${TARGET_ARCH}
+	case $target_cpu in
+	i?86)
+		TARGET_CPU=i386
+		;;
+	x86_64)
+		TARGET_CPU=x86_64
 		;;
-	*)
-		TARGET_ASM_DIR=asm-generic
+	powerpc*)
+		TARGET_CPU=powerpc
+		;;
+	aarch64*)
+		TARGET_CPU=aarch64
+		;;
+	sparc64)
+		TARGET_CPU=sparc64
 		;;
 	esac
 
-	AC_SUBST([TARGET_ASM_DIR])
-	AM_CONDITIONAL([TARGET_ASM_X86_64], test $TARGET_ASM_DIR = asm-x86_64)
-	AM_CONDITIONAL([TARGET_ASM_I386], test $TARGET_ASM_DIR = asm-i386)
-	AM_CONDITIONAL([TARGET_ASM_GENERIC], test $TARGET_ASM_DIR = asm-generic)
-	AC_MSG_RESULT([$TARGET_ASM_DIR])
+	AC_SUBST(TARGET_CPU)
+
+	AM_CONDITIONAL([TARGET_CPU_I386], test $TARGET_CPU = i386)
+	AM_CONDITIONAL([TARGET_CPU_X86_64], test $TARGET_CPU = x86_64)
+	AM_CONDITIONAL([TARGET_CPU_POWERPC], test $TARGET_CPU = powerpc)
+	AM_CONDITIONAL([TARGET_CPU_AARCH64], test $TARGET_CPU = aarch64)
+	AM_CONDITIONAL([TARGET_CPU_SPARC64], test $TARGET_CPU = sparc64)
 ])

lib/libicp/Makefile.am

@@ -9,7 +9,7 @@ AM_CFLAGS += $(FRAME_LARGER_THAN)
 
 noinst_LTLIBRARIES = libicp.la
 
-if TARGET_ASM_X86_64
+if TARGET_CPU_X86_64
 ASM_SOURCES_C = asm-x86_64/aes/aeskey.c
 ASM_SOURCES_AS = \
 	asm-x86_64/aes/aes_amd64.S \
@@ -18,22 +18,11 @@ ASM_SOURCES_AS = \
 	asm-x86_64/sha1/sha1-x86_64.S \
 	asm-x86_64/sha2/sha256_impl.S \
 	asm-x86_64/sha2/sha512_impl.S
-endif
-
-if TARGET_ASM_I386
-ASM_SOURCES_C =
-ASM_SOURCES_AS =
-endif
-
-if TARGET_ASM_GENERIC
+else
 ASM_SOURCES_C =
 ASM_SOURCES_AS =
 endif
 
-USER_C =
-
-USER_ASM =
-
 KERNEL_C = \
 	spi/kcf_spi.c \
 	api/kcf_ctxops.c \
@@ -78,8 +67,6 @@ KERNEL_C = \
 KERNEL_ASM = $(ASM_SOURCES_AS)
 
 nodist_libicp_la_SOURCES = \
-	$(USER_C) \
-	$(USER_ASM) \
 	$(KERNEL_C) \
 	$(KERNEL_ASM)
 

lib/libspl/Makefile.am

@@ -1,10 +1,20 @@
 include $(top_srcdir)/config/Rules.am
 
+if TARGET_CPU_I386
+TARGET_CPU_DIR = asm-i386
+else
+if TARGET_CPU_X86_64
+TARGET_CPU_DIR = asm-x86_64
+else
+TARGET_CPU_DIR = asm-generic
+endif
+endif
+
 VPATH = \
 	$(top_srcdir)/lib/libspl \
-	$(top_srcdir)/lib/libspl/$(TARGET_ASM_DIR)
+	$(top_srcdir)/lib/libspl/$(TARGET_CPU_DIR)
 
-SUBDIRS = include $(TARGET_ASM_DIR)
+SUBDIRS = include $(TARGET_CPU_DIR)
 DIST_SUBDIRS = include asm-generic asm-i386 asm-x86_64
 
 AM_CFLAGS += $(LIBTIRPC_CFLAGS)

lib/libspl/asm-generic/.gitignore

@@ -0,0 +1 @@
+/atomic.S

module/icp/Makefile.in

@@ -3,26 +3,6 @@ obj = @abs_builddir@
 
 MODULE := icp
 
-TARGET_ASM_DIR = @TARGET_ASM_DIR@
-
-ifeq ($(TARGET_ASM_DIR), asm-x86_64)
-ASM_SOURCES := asm-x86_64/aes/aeskey.o
-ASM_SOURCES += asm-x86_64/aes/aes_amd64.o
-ASM_SOURCES += asm-x86_64/aes/aes_aesni.o
-ASM_SOURCES += asm-x86_64/modes/gcm_pclmulqdq.o
-ASM_SOURCES += asm-x86_64/sha1/sha1-x86_64.o
-ASM_SOURCES += asm-x86_64/sha2/sha256_impl.o
-ASM_SOURCES += asm-x86_64/sha2/sha512_impl.o
-endif
-
-ifeq ($(TARGET_ASM_DIR), asm-i386)
-ASM_SOURCES :=
-endif
-
-ifeq ($(TARGET_ASM_DIR), asm-generic)
-ASM_SOURCES :=
-endif
-
 obj-$(CONFIG_ZFS) := $(MODULE).o
 
 asflags-y := -I$(src)/include
@@ -66,7 +46,14 @@ $(MODULE)-objs += algs/sha1/sha1.o
 $(MODULE)-objs += algs/skein/skein.o
 $(MODULE)-objs += algs/skein/skein_block.o
 $(MODULE)-objs += algs/skein/skein_iv.o
-$(MODULE)-objs += $(ASM_SOURCES)
+
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/aes/aeskey.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/aes/aes_amd64.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/aes/aes_aesni.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/modes/gcm_pclmulqdq.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/sha1/sha1-x86_64.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/sha2/sha256_impl.o
+$(MODULE)-$(CONFIG_X86_64) += asm-x86_64/sha2/sha512_impl.o
 
 $(MODULE)-$(CONFIG_X86) += algs/modes/gcm_pclmulqdq.o
 $(MODULE)-$(CONFIG_X86) += algs/aes/aes_impl_aesni.o

module/os/linux/zfs/Makefile.in

@@ -3,9 +3,7 @@
 #
 
 # Suppress unused-value warnings in sparc64 architecture headers
-ifeq ($(target_cpu),sparc64)
-ccflags-y += -Wno-unused-value
-endif
+ccflags-$(CONFIG_SPARC64) += -Wno-unused-value
 
 ccflags-y += -I@abs_top_srcdir@/module/os/linux/zfs
 

module/zcommon/Makefile.in

@@ -9,9 +9,7 @@ obj-$(CONFIG_ZFS) := $(MODULE).o
 ccflags-y := $(ZFS_MODULE_CFLAGS) $(ZFS_MODULE_CPPFLAGS)
 
 # Suppress unused-value warnings in sparc64 architecture headers
-ifeq ($(target_cpu),sparc64)
-ccflags-y += -Wno-unused-value
-endif
+ccflags-$(CONFIG_SPARC64) += -Wno-unused-value
 
 $(MODULE)-objs += zfeature_common.o
 $(MODULE)-objs += zfs_comutil.o

module/zfs/Makefile.in

@@ -8,14 +8,12 @@ obj-$(CONFIG_ZFS) := $(MODULE).o
 
 ccflags-y := $(ZFS_MODULE_CFLAGS) $(ZFS_MODULE_CPPFLAGS)
 
-# Suppress unused-value warnings in sparc64 architecture headers
-ifeq ($(target_cpu),sparc64)
-ccflags-y += -Wno-unused-value
-endif
-
 # Suppress unused but set variable warnings often due to ASSERTs
 ccflags-y += $(NO_UNUSED_BUT_SET_VARIABLE)
 
+# Suppress unused-value warnings in sparc64 architecture headers
+ccflags-$(CONFIG_SPARC64) += -Wno-unused-value
+
 $(MODULE)-objs += aggsum.o
 $(MODULE)-objs += arc.o
 $(MODULE)-objs += blkptr.o