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Message-ID: <20120422212220.GA6537@merkur.ravnborg.org>
Date: Sun, 22 Apr 2012 23:22:20 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: linux arch <linux-arch@...r.kernel.org>,
linux-kbuild <linux-kbuild@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>
Cc: Michal Marek <mmarek@...e.cz>
Subject: [RFC] move link of vmlinux to a script
The part of the top-level Makefile that links the
final vmlinux has accumulated a lot of cruft over
times and the makefile code is unreadable for
any normal human.
This is an attempt to clean up the situation, by
moving all the logic to a shell script.
In reality we almost never rely on the Makefile
logic to avoid a few steps in the link - and
the process is serialized in any case.
So the drawbacks by moving this to a shell script
are small compared to the added readability.
Known issues:
- sparc32 is broken by this. I will address the
sparc32 bits before I do any final submission.
All the link magic is moved to a shell script:
scripts/link-vmlinux.sh
To do so a few varialbles had to be exported
form the top-level Makefile.
"um" has a local definition of the linker
macro. I found no better way than to hardcode this
in the script. It looks ugly - and alternatives are
welcome!
If you apply the patch you can use:
make V=L (capital L)
to debug the script.
The default is the non-verbose output.
My shell script foo is limited, so expect to
find something sub-optimal in the script.
Sam
b/Makefile | 211 +---------------------------------------
b/arch/um/Makefile | 11 --
b/scripts/link-vmlinux.sh | 238 ++++++++++++++++++++++++++++++++++++++++++++++
scripts/mksysmap | 45 --------
4 files changed, 250 insertions(+), 255 deletions(-)
diff --git a/Makefile b/Makefile
index f6578f4..ca0b407 100644
--- a/Makefile
+++ b/Makefile
@@ -341,7 +341,6 @@ AWK = awk
GENKSYMS = scripts/genksyms/genksyms
INSTALLKERNEL := installkernel
DEPMOD = /sbin/depmod
-KALLSYMS = scripts/kallsyms
PERL = perl
CHECK = sparse
@@ -727,187 +726,16 @@ libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
libs-y := $(libs-y1) $(libs-y2)
-# Build vmlinux
-# ---------------------------------------------------------------------------
-# vmlinux is built from the objects selected by $(vmlinux-init) and
-# $(vmlinux-main). Most are built-in.o files from top-level directories
-# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
-# Ordering when linking is important, and $(vmlinux-init) must be first.
-#
-# vmlinux
-# ^
-# |
-# +-< $(vmlinux-init)
-# | +--< init/version.o + more
-# |
-# +--< $(vmlinux-main)
-# | +--< driver/built-in.o mm/built-in.o + more
-# |
-# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
-#
-# vmlinux version (uname -v) cannot be updated during normal
-# descending-into-subdirs phase since we do not yet know if we need to
-# update vmlinux.
-# Therefore this step is delayed until just before final link of vmlinux -
-# except in the kallsyms case where it is done just before adding the
-# symbols to the kernel.
-#
-# System.map is generated to document addresses of all kernel symbols
-
-vmlinux-init := $(head-y) $(init-y)
-vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
-vmlinux-all := $(vmlinux-init) $(vmlinux-main)
-vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
-export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
-
-# Rule to link vmlinux - also used during CONFIG_KALLSYMS
-# May be overridden by arch/$(ARCH)/Makefile
-quiet_cmd_vmlinux__ ?= LD $@
- cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
- -T $(vmlinux-lds) $(vmlinux-init) \
- --start-group $(vmlinux-main) --end-group \
- $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
-
-# Generate new vmlinux version
-quiet_cmd_vmlinux_version = GEN .version
- cmd_vmlinux_version = set -e; \
- if [ ! -r .version ]; then \
- rm -f .version; \
- echo 1 >.version; \
- else \
- mv .version .old_version; \
- expr 0$$(cat .old_version) + 1 >.version; \
- fi; \
- $(MAKE) $(build)=init
-
-# Generate System.map
-quiet_cmd_sysmap = SYSMAP
- cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
-
-# Link of vmlinux
-# If CONFIG_KALLSYMS is set .version is already updated
-# Generate System.map and verify that the content is consistent
-# Use + in front of the vmlinux_version rule to silent warning with make -j2
-# First command is ':' to allow us to use + in front of the rule
-define rule_vmlinux__
- :
- $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
-
- $(call cmd,vmlinux__)
- $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
-
- $(Q)$(if $($(quiet)cmd_sysmap), \
- echo ' $($(quiet)cmd_sysmap) System.map' &&) \
- $(cmd_sysmap) $@ System.map; \
- if [ $$? -ne 0 ]; then \
- rm -f $@; \
- /bin/false; \
- fi;
- $(verify_kallsyms)
-endef
-
-
-ifdef CONFIG_KALLSYMS
-# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
-# It's a three stage process:
-# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
-# empty
-# Running kallsyms on that gives us .tmp_kallsyms1.o with
-# the right size - vmlinux version (uname -v) is updated during this step
-# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
-# but due to the added section, some addresses have shifted.
-# From here, we generate a correct .tmp_kallsyms2.o
-# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
-# o Verify that the System.map from vmlinux matches the map from
-# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
-# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
-# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
-# temporary bypass to allow the kernel to be built while the
-# maintainers work out what went wrong with kallsyms.
-
-last_kallsyms := 2
-
-ifdef KALLSYMS_EXTRA_PASS
-ifneq ($(KALLSYMS_EXTRA_PASS),0)
-last_kallsyms := 3
-endif
-endif
-
-kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
-
-define verify_kallsyms
- $(Q)$(if $($(quiet)cmd_sysmap), \
- echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
- $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
- $(Q)cmp -s System.map .tmp_System.map || \
- (echo Inconsistent kallsyms data; \
- echo This is a bug - please report about it; \
- echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
- rm .tmp_kallsyms* ; /bin/false )
-endef
-
-# Update vmlinux version before link
-# Use + in front of this rule to silent warning about make -j1
-# First command is ':' to allow us to use + in front of this rule
-cmd_ksym_ld = $(cmd_vmlinux__)
-define rule_ksym_ld
- :
- +$(call cmd,vmlinux_version)
- $(call cmd,vmlinux__)
- $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
-endef
-
-# Generate .S file with all kernel symbols
-quiet_cmd_kallsyms = KSYM $@
- cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
- $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
-
-.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
- $(call if_changed_dep,as_o_S)
+# used by link-vmlinux.sh
+export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
+export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
+export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
+export LDFLAGS_vmlinux
-.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
- $(call cmd,kallsyms)
+vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
-# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
-.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
- $(call if_changed_rule,ksym_ld)
-
-.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
- $(call if_changed,vmlinux__)
-
-.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
- $(call if_changed,vmlinux__)
-
-# Needs to visit scripts/ before $(KALLSYMS) can be used.
-$(KALLSYMS): scripts ;
-
-# Generate some data for debugging strange kallsyms problems
-debug_kallsyms: .tmp_map$(last_kallsyms)
-
-.tmp_map%: .tmp_vmlinux% FORCE
- ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
-
-.tmp_map3: .tmp_map2
-
-.tmp_map2: .tmp_map1
-
-endif # ifdef CONFIG_KALLSYMS
-
-# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
-# relevant sections renamed as per the linker script.
-quiet_cmd_vmlinux-modpost = LD $@
- cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
- $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
- $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
-define rule_vmlinux-modpost
- :
- +$(call cmd,vmlinux-modpost)
- $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
- $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
-endef
-
-# vmlinux image - including updated kernel symbols
-vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
+# vmlinux image
+vmlinux: scripts/link-vmlinux.sh scripts/kallsyms $(vmlinux-deps)
ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
@@ -917,22 +745,11 @@ endif
ifdef CONFIG_BUILD_DOCSRC
$(Q)$(MAKE) $(build)=Documentation
endif
- $(call vmlinux-modpost)
- $(call if_changed_rule,vmlinux__)
- $(Q)rm -f .old_version
-
-# build vmlinux.o first to catch section mismatch errors early
-ifdef CONFIG_KALLSYMS
-.tmp_vmlinux1: vmlinux.o
-endif
-
-modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
-vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
- $(call if_changed_rule,vmlinux-modpost)
+ $(Q)$(CONFIG_SHELL) $<
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
-$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
+$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
# Handle descending into subdirectories listed in $(vmlinux-dirs)
# Preset locale variables to speed up the build process. Limit locale
@@ -1536,14 +1353,6 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
-a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
- $(KBUILD_AFLAGS_KERNEL) \
- $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
- $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
-
-quiet_cmd_as_o_S = AS $@
-cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
-
# read all saved command lines
targets := $(wildcard $(sort $(targets)))
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 55c0661..6decba4 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -121,15 +121,8 @@ LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
-CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
-define cmd_vmlinux__
- $(CC) $(CFLAGS_vmlinux) -o $@ \
- -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
- -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
- -lutil \
- $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
- FORCE ,$^) ; rm -f linux
-endef
+# used by link-vmlinux.sh
+export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
# When cleaning we don't include .config, so we don't include
# TT or skas makefiles and don't clean skas_ptregs.h.
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
new file mode 100644
index 0000000..c5a46ae
--- /dev/null
+++ b/scripts/link-vmlinux.sh
@@ -0,0 +1,238 @@
+#!/bin/sh
+#
+# link vmlinux
+#
+# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
+# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
+# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
+# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
+#
+# vmlinux
+# ^
+# |
+# +-< $(KBUILD_VMLINUX_INIT)
+# | +--< init/version.o + more
+# |
+# +--< $(KBUILD_VMLINUX_MAIN)
+# | +--< driver/built-in.o mm/built-in.o + more
+# |
+# +-< ${kallsymso} (see description in KALLSYMS section)
+#
+# vmlinux version (uname -v) cannot be updated during normal
+# descending-into-subdirs phase since we do not yet know if we need to
+# update vmlinux.
+# Therefore this step is delayed until just before final link of vmlinux.
+#
+# System.map is generated to document addresses of all kernel symbols
+
+# We need access to CONFIG_ symbols
+source ./.config
+
+# Error out on error
+set -e
+
+# Link of vmlinux
+# $1 output file
+modpost_link()
+{
+ ${LD} ${LDFLAGS} -r -o $1 ${KBUILD_VMLINUX_INIT} \
+ --start-group ${KBUILD_VMLINUX_MAIN} --end-group
+}
+
+# Link of vmlinux
+# $1 - optional extra .o files
+# $2 output file
+vmlinux_link()
+{
+ local lds=${srctree}/arch/${SRCARCH}/kernel/vmlinux.lds
+echo srcarch=${SRCARCH} CF=${CFLAGS_vmlinux}
+ if [ "${SRCARCH}" != "um" ]; then
+ ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o $2 \
+ -T ${lds} ${KBUILD_VMLINUX_INIT} \
+ --start-group ${KBUILD_VMLINUX_MAIN} --end-group $1
+ else
+ ${CC} ${CFLAGS_vmlinux} -o $2 \
+ -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT} \
+ -Wl,--start-group \
+ ${KBUILD_VMLINUX_MAIN} \
+ -Wl,--end-group \
+ -lutil $1
+ rm -f linux
+ fi
+}
+
+
+# Create $2 .o file with all symbols from $1 .o file
+kallsyms()
+{
+ info KSYM $2
+ local kallsymopt;
+
+ if [ "${CONFIG_KALLSYMS_ALL}" != "" ]; then
+ kallsymopt=--all-symbols
+ fi
+
+ local aflags="${KBUILD_AFLAGS} ${AFLAGS_KERNEL} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} ${modkern_aflags}"
+ ${NM} -n $1 | \
+ scripts/kallsyms ${kallsymopt} | \
+ ${CC} ${aflags} -c -o $2 -x assembler-with-cpp -
+}
+
+# Based on the vmlinux file create the System.map file
+# System.map is used by module-init tools and some debugging
+# tools to retrieve the actual addresses of symbols in the kernel.
+# Generate System.map (actual filename passed as second argument)
+
+# $NM produces the following output:
+# f0081e80 T alloc_vfsmnt
+
+# The second row specify the type of the symbol:
+# A = Absolute
+# B = Uninitialised data (.bss)
+# C = Comon symbol
+# D = Initialised data
+# G = Initialised data for small objects
+# I = Indirect reference to another symbol
+# N = Debugging symbol
+# R = Read only
+# S = Uninitialised data for small objects
+# T = Text code symbol
+# U = Undefined symbol
+# V = Weak symbol
+# W = Weak symbol
+# Corresponding small letters are local symbols
+
+# For System.map filter away:
+# a - local absolute symbols
+# U - undefined global symbols
+# N - debugging symbols
+# w - local weak symbols
+
+# readprofile starts reading symbols when _stext is found, and
+# continue until it finds a symbol which is not either of 'T', 't',
+# 'W' or 'w'. __crc_ are 'A' and placed in the middle
+# so we just ignore them to let readprofile continue to work.
+# (At least sparc64 has __crc_ in the middle).
+mksysmap()
+{
+ $NM -n $1 | \
+ grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2
+}
+
+
+# Delete output files in case of error
+trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
+cleanup()
+{
+ rm -f vmlinux.o
+ rm -f .old_version
+ rm -f .tmp_vmlinux*
+ rm -f .tmp_kallsyms*
+ rm -f vmlinux
+ rm -f .tmp_System.map
+ rm -f System.map
+}
+
+# non-verbose output
+info()
+{
+ printf " %-7s %s\n" $1 $2
+}
+
+# Use "make V=L" to debug this script
+case "${KBUILD_VERBOSE}" in
+*L*)
+ set -x
+ ;;
+esac
+
+# Override MAKEFLAGS to avoid parrallel builds
+MAKEFLAGS='--no-print-directory -Rr'
+
+#link vmlinux.o
+info LD vmlinux.o
+modpost_link vmlinux.o
+
+# modpost vmlinux.o to check for section mismatches
+${MAKE} -f ${srctree}/scripts/Makefile.modpost vmlinux.o
+
+# Update version
+info GEN .version
+if [ ! -r .version ]; then
+ rm -f .version;
+ echo 1 >.version;
+else
+ mv .version .old_version;
+ expr 0$(cat .old_version) + 1 >.version;
+fi;
+
+# final build of init/
+${MAKE} -f ${srctree}/scripts/Makefile.build obj=init
+
+
+kallsymso=""
+kallsyms_vmlinux=""
+
+if [ "${CONFIG_KALLSYMS}" != "" ]; then
+
+ # kallsyms support
+ # Generate section listing all symbols and add it into vmlinux
+ # It's a three step process:
+ # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
+ # but __kallsyms is empty.
+ # Running kallsyms on that gives us .tmp_kallsyms1.o with
+ # the right size
+ # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
+ # the right size, but due to the added section, some
+ # addresses have shifted.
+ # From here, we generate a correct .tmp_kallsyms2.o
+ # 2a) We may use an extra pass as this has been necessary to
+ # woraround some alignment related bugs.
+ # KALLSYMS_EXTRA_PASS=1 is used to trigger this.
+ # 3) The correct ${kallsymso} is linked into the final vmlinux.
+ #
+ # a) Verify that the System.map from vmlinux matches the map from
+ # ${kallsymso}.
+
+ kallsymso=.tmp_kallsyms2.o
+ kallsyms_vmlinux=.tmp_vmlinux2
+
+ # step 1
+ vmlinux_link "" .tmp_vmlinux1
+ kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
+
+ # step 2
+ vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
+ kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
+
+ # step 2a
+ if [ "${KALLSYMS_EXTRA_PASS}" != "" ]; then
+ kallsymso=.tmp_kallsyms3.o
+ kallsyms_vmlinux=.tmp_vmlinux2
+
+ vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
+
+ kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
+ fi
+fi
+
+vmlinux_link "${kallsymso}" vmlinux
+
+info SYSMAP System.map
+mksysmap vmlinux System.map
+
+# step a (see comment above)
+if [ "${CONFIG_KALLSYMS}" != "" ]; then
+ mksysmap ${kallsyms_vmlinux} .tmp_System.map
+
+ if [ $(cmp -s System.map .tmp_System.map) ]; then
+ echo Inconsistent kallsyms data
+ echo This is a bug - please report about it
+ echo echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
+ cleanup
+ exit 1
+ fi
+fi
+
+# We made a new kernel - delete old version file
+rm -f .old_version
diff --git a/scripts/mksysmap b/scripts/mksysmap
deleted file mode 100644
index 6e133a0..0000000
--- a/scripts/mksysmap
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/bin/sh -x
-# Based on the vmlinux file create the System.map file
-# System.map is used by module-init tools and some debugging
-# tools to retrieve the actual addresses of symbols in the kernel.
-#
-# Usage
-# mksysmap vmlinux System.map
-
-
-#####
-# Generate System.map (actual filename passed as second argument)
-
-# $NM produces the following output:
-# f0081e80 T alloc_vfsmnt
-
-# The second row specify the type of the symbol:
-# A = Absolute
-# B = Uninitialised data (.bss)
-# C = Comon symbol
-# D = Initialised data
-# G = Initialised data for small objects
-# I = Indirect reference to another symbol
-# N = Debugging symbol
-# R = Read only
-# S = Uninitialised data for small objects
-# T = Text code symbol
-# U = Undefined symbol
-# V = Weak symbol
-# W = Weak symbol
-# Corresponding small letters are local symbols
-
-# For System.map filter away:
-# a - local absolute symbols
-# U - undefined global symbols
-# N - debugging symbols
-# w - local weak symbols
-
-# readprofile starts reading symbols when _stext is found, and
-# continue until it finds a symbol which is not either of 'T', 't',
-# 'W' or 'w'. __crc_ are 'A' and placed in the middle
-# so we just ignore them to let readprofile continue to work.
-# (At least sparc64 has __crc_ in the middle).
-
-$NM -n $1 | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $2
-
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