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rust/mk/main.mk
Alex Crichton bb5f03b900 mk: Add -C prefer-dynamic to stage3 libs 
Right now the windows nightlies are failing because they're encountering a
linker error when producing stage3 libs. The stage3 libs aren't actually used in
general, and we primarily just want to generate a static stage3 binary, not
static stage3 dylibs.
2014-11-06 11:29:49 -08:00

555 lines
18 KiB
Makefile
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# Copyright 2014 The Rust Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution and at
# http://rust-lang.org/COPYRIGHT.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
######################################################################
# Version numbers and strings
######################################################################
# The version number
CFG_RELEASE_NUM=0.13.0
CFG_FILENAME_EXTRA=4e7c5e5c
ifeq ($(CFG_RELEASE_CHANNEL),stable)
# This is the normal semver version string, e.g. "0.12.0", "0.12.0-nightly"
CFG_RELEASE=$(CFG_RELEASE_NUM)
# This is the string used in dist artifact file names, e.g. "0.12.0", "nightly"
CFG_PACKAGE_VERS=$(CFG_RELEASE_NUM)
endif
ifeq ($(CFG_RELEASE_CHANNEL),beta)
CFG_RELEASE=$(CFG_RELEASE_NUM)-beta
# When building beta/nightly distributables just reuse the same "beta"
# name so when we upload we'll always override the previous
# nighly. This doesn't actually impact the version reported by rustc -
# it's just for file naming.
CFG_PACKAGE_VERS=beta
endif
ifeq ($(CFG_RELEASE_CHANNEL),nightly)
CFG_RELEASE=$(CFG_RELEASE_NUM)-nightly
CFG_PACKAGE_VERS=nightly
endif
ifeq ($(CFG_RELEASE_CHANNEL),dev)
CFG_RELEASE=$(CFG_RELEASE_NUM)-dev
CFG_PACKAGE_VERS=$(CFG_RELEASE_NUM)-dev
endif
# The name of the package to use for creating tarballs, installers etc.
CFG_PACKAGE_NAME=rust-$(CFG_PACKAGE_VERS)
# The version string plus commit information - this is what rustc reports
CFG_VERSION = $(CFG_RELEASE)
CFG_GIT_DIR := $(CFG_SRC_DIR).git
# since $(CFG_GIT) may contain spaces (especially on Windows),
# we need to escape them. (" " to r"\ ")
# Note that $(subst ...) ignores space after `subst`,
# so we use a hack: define $(SPACE) which contains space character.
SPACE :=
SPACE +=
ifneq ($(wildcard $(subst $(SPACE),\$(SPACE),$(CFG_GIT))),)
ifneq ($(wildcard $(subst $(SPACE),\$(SPACE),$(CFG_GIT_DIR))),)
CFG_VER_DATE = $(shell git --git-dir='$(CFG_GIT_DIR)' log -1 --pretty=format:'%ci')
CFG_VER_HASH = $(shell git --git-dir='$(CFG_GIT_DIR)' rev-parse HEAD)
CFG_SHORT_VER_HASH = $(shell git --git-dir='$(CFG_GIT_DIR)' rev-parse --short=9 HEAD)
CFG_VERSION += ($(CFG_SHORT_VER_HASH) $(CFG_VER_DATE))
endif
endif
# Windows exe's need numeric versions - don't use anything but
# numbers and dots here
CFG_VERSION_WIN = $(CFG_RELEASE_NUM)
######################################################################
# More configuration
######################################################################
# We track all of the object files we might build so that we can find
# and include all of the .d files in one fell swoop.
ALL_OBJ_FILES :=
MKFILE_DEPS := config.stamp $(call rwildcard,$(CFG_SRC_DIR)mk/,*)
MKFILES_FOR_TARBALL:=$(MKFILE_DEPS)
ifneq ($(NO_MKFILE_DEPS),)
MKFILE_DEPS :=
endif
NON_BUILD_HOST = $(filter-out $(CFG_BUILD),$(CFG_HOST))
NON_BUILD_TARGET = $(filter-out $(CFG_BUILD),$(CFG_TARGET))
ifneq ($(MAKE_RESTARTS),)
CFG_INFO := $(info cfg: make restarts: $(MAKE_RESTARTS))
endif
CFG_INFO := $(info cfg: build triple $(CFG_BUILD))
CFG_INFO := $(info cfg: host triples $(CFG_HOST))
CFG_INFO := $(info cfg: target triples $(CFG_TARGET))
ifneq ($(wildcard $(NON_BUILD_HOST)),)
CFG_INFO := $(info cfg: non-build host triples $(NON_BUILD_HOST))
endif
ifneq ($(wildcard $(NON_BUILD_TARGET)),)
CFG_INFO := $(info cfg: non-build target triples $(NON_BUILD_TARGET))
endif
CFG_RUSTC_FLAGS := $(RUSTFLAGS)
CFG_GCCISH_CFLAGS :=
CFG_GCCISH_LINK_FLAGS :=
# Turn off broken quarantine (see jemalloc/jemalloc#161)
CFG_JEMALLOC_FLAGS := --disable-fill
ifdef CFG_DISABLE_OPTIMIZE
$(info cfg: disabling rustc optimization (CFG_DISABLE_OPTIMIZE))
CFG_RUSTC_FLAGS +=
CFG_JEMALLOC_FLAGS += --enable-debug
else
# The rtopt cfg turns off runtime sanity checks
CFG_RUSTC_FLAGS += -O --cfg rtopt
endif
CFG_JEMALLOC_FLAGS += $(JEMALLOC_FLAGS)
ifdef CFG_DISABLE_DEBUG
CFG_RUSTC_FLAGS += --cfg ndebug
CFG_GCCISH_CFLAGS += -DRUST_NDEBUG
else
$(info cfg: enabling more debugging (CFG_ENABLE_DEBUG))
CFG_RUSTC_FLAGS += --cfg debug
CFG_GCCISH_CFLAGS += -DRUST_DEBUG
endif
ifdef SAVE_TEMPS
CFG_RUSTC_FLAGS += --save-temps
endif
ifdef ASM_COMMENTS
CFG_RUSTC_FLAGS += -Z asm-comments
endif
ifdef TIME_PASSES
CFG_RUSTC_FLAGS += -Z time-passes
endif
ifdef TIME_LLVM_PASSES
CFG_RUSTC_FLAGS += -Z time-llvm-passes
endif
ifdef TRACE
CFG_RUSTC_FLAGS += -Z trace
endif
ifdef CFG_ENABLE_RPATH
CFG_RUSTC_FLAGS += -C rpath
endif
# The executables crated during this compilation process have no need to include
# static copies of libstd and libextra. We also generate dynamic versions of all
# libraries, so in the interest of space, prefer dynamic linking throughout the
# compilation process.
#
# Note though that these flags are omitted for the *bins* in stage2+. This means
# that the snapshot will be generated with a statically linked rustc so we only
# have to worry about the distribution of one file (with its native dynamic
# dependencies)
RUSTFLAGS_STAGE0 += -C prefer-dynamic
RUSTFLAGS_STAGE1 += -C prefer-dynamic
RUST_LIB_FLAGS_ST2 += -C prefer-dynamic
RUST_LIB_FLAGS_ST3 += -C prefer-dynamic
# Landing pads require a lot of codegen. We can get through bootstrapping faster
# by not emitting them.
RUSTFLAGS_STAGE0 += -Z no-landing-pads
# platform-specific auto-configuration
include $(CFG_SRC_DIR)mk/platform.mk
# Run the stage1/2 compilers under valgrind
ifdef VALGRIND_COMPILE
CFG_VALGRIND_COMPILE :=$(CFG_VALGRIND)
else
CFG_VALGRIND_COMPILE :=
endif
ifndef CFG_DISABLE_VALGRIND_RPASS
$(info cfg: enabling valgrind run-pass tests (CFG_ENABLE_VALGRIND_RPASS))
CFG_VALGRIND_RPASS :=$(CFG_VALGRIND)
else
CFG_VALGRIND_RPASS :=
endif
ifdef CFG_ENABLE_VALGRIND
$(info cfg: enabling valgrind (CFG_ENABLE_VALGRIND))
else
CFG_VALGRIND :=
endif
######################################################################
# Target-and-rule "utility variables"
######################################################################
define DEF_X
X_$(1) := $(CFG_EXE_SUFFIX_$(1))
endef
$(foreach target,$(CFG_TARGET), \
$(eval $(call DEF_X,$(target))))
# "Source" files we generate in builddir along the way.
GENERATED :=
# Delete the built-in rules.
.SUFFIXES:
%:: %,v
%:: RCS/%,v
%:: RCS/%
%:: s.%
%:: SCCS/s.%
######################################################################
# Cleaning out old crates
######################################################################
# $(1) is the path for directory to match against
# $(2) is the glob to use in the match
#
# Note that a common bug is to accidentally construct the glob denoted
# by $(2) with a space character prefix, which invalidates the
# construction $(1)$(2).
define CHECK_FOR_OLD_GLOB_MATCHES
$(Q)MATCHES="$(wildcard $(1))"; if [ -n "$$MATCHES" ] ; then echo "warning: there are previous" \'$(notdir $(2))\' "libraries:" $$MATCHES; fi
endef
# Same interface as above, but deletes rather than just listing the files.
ifdef VERBOSE
define REMOVE_ALL_OLD_GLOB_MATCHES
$(Q)MATCHES="$(wildcard $(1))"; if [ -n "$$MATCHES" ] ; then echo "warning: removing previous" \'$(notdir $(1))\' "libraries:" $$MATCHES; rm $$MATCHES ; fi
endef
else
define REMOVE_ALL_OLD_GLOB_MATCHES
$(Q)MATCHES="$(wildcard $(1))"; if [ -n "$$MATCHES" ] ; then rm $$MATCHES ; fi
endef
endif
# We use a different strategy for LIST_ALL_OLD_GLOB_MATCHES_EXCEPT
# than in the macros above because it needs the result of running the
# `ls` command after other rules in the command list have run; the
# macro-expander for $(wildcard ...) would deliver its results too
# soon. (This is in contrast to the macros above, which are meant to
# be run at the outset of a command list in a rule.)
ifdef VERBOSE
define LIST_ALL_OLD_GLOB_MATCHES
@echo "info: now are following matches for" '$(notdir $(1))' "libraries:"
@( ls $(1) 2>/dev/null || true )
endef
else
define LIST_ALL_OLD_GLOB_MATCHES
endef
endif
######################################################################
# LLVM macros
######################################################################
# FIXME: x86-ism
LLVM_COMPONENTS=x86 arm mips ipo bitreader bitwriter linker asmparser mcjit \
interpreter instrumentation
# Only build these LLVM tools
LLVM_TOOLS=bugpoint llc llvm-ar llvm-as llvm-dis llvm-mc opt llvm-extract
define DEF_LLVM_VARS
# The configure script defines these variables with the target triples
# separated by Z. This defines new ones with the expected format.
ifeq ($$(CFG_LLVM_ROOT),)
CFG_LLVM_BUILD_DIR_$(1):=$$(CFG_LLVM_BUILD_DIR_$(subst -,_,$(1)))
CFG_LLVM_INST_DIR_$(1):=$$(CFG_LLVM_INST_DIR_$(subst -,_,$(1)))
else
CFG_LLVM_INST_DIR_$(1):=$$(CFG_LLVM_ROOT)
endif
# Any rules that depend on LLVM should depend on LLVM_CONFIG
LLVM_CONFIG_$(1):=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-config$$(X_$(1))
LLVM_MC_$(1):=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-mc$$(X_$(1))
LLVM_VERSION_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --version)
LLVM_BINDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --bindir)
LLVM_INCDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --includedir)
LLVM_LIBDIR_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --libdir)
LLVM_LIBS_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --libs $$(LLVM_COMPONENTS))
LLVM_LDFLAGS_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --ldflags)
# On FreeBSD, it may search wrong headers (that are for pre-installed LLVM),
# so we replace -I with -iquote to ensure that it searches bundled LLVM first.
LLVM_CXXFLAGS_$(1)=$$(subst -I, -iquote , $$(shell "$$(LLVM_CONFIG_$(1))" --cxxflags))
LLVM_HOST_TRIPLE_$(1)=$$(shell "$$(LLVM_CONFIG_$(1))" --host-target)
LLVM_AS_$(1)=$$(CFG_LLVM_INST_DIR_$(1))/bin/llvm-as$$(X_$(1))
LLC_$(1)=$$(CFG_LLVM_INST_DIR_$(1))/bin/llc$$(X_$(1))
endef
$(foreach host,$(CFG_HOST), \
$(eval $(call DEF_LLVM_VARS,$(host))))
######################################################################
# Exports for sub-utilities
######################################################################
# Note that any variable that re-configure should pick up needs to be
# exported
export CFG_SRC_DIR
export CFG_BUILD_DIR
ifdef CFG_VER_DATE
export CFG_VER_DATE
endif
ifdef CFG_VER_HASH
export CFG_VER_HASH
endif
export CFG_VERSION
export CFG_VERSION_WIN
export CFG_RELEASE
export CFG_PACKAGE_NAME
export CFG_BUILD
export CFG_LLVM_ROOT
export CFG_PREFIX
export CFG_LIBDIR
export CFG_LIBDIR_RELATIVE
export CFG_DISABLE_INJECT_STD_VERSION
######################################################################
# Per-stage targets and runner
######################################################################
STAGES = 0 1 2 3
define SREQ
# $(1) is the stage number
# $(2) is the target triple
# $(3) is the host triple
# Destinations of artifacts for the host compiler
HROOT$(1)_H_$(3) = $(3)/stage$(1)
HBIN$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/bin
HLIB$(1)_H_$(3) = $$(HROOT$(1)_H_$(3))/$$(CFG_LIBDIR_RELATIVE)
# Destinations of artifacts for target architectures
TROOT$(1)_T_$(2)_H_$(3) = $$(HLIB$(1)_H_$(3))/rustlib/$(2)
TBIN$(1)_T_$(2)_H_$(3) = $$(TROOT$(1)_T_$(2)_H_$(3))/bin
TLIB$(1)_T_$(2)_H_$(3) = $$(TROOT$(1)_T_$(2)_H_$(3))/lib
# Preqrequisites for using the stageN compiler
ifeq ($(1),0)
HSREQ$(1)_H_$(3) = $$(HBIN$(1)_H_$(3))/rustc$$(X_$(3))
else
HSREQ$(1)_H_$(3) = \
$$(HBIN$(1)_H_$(3))/rustc$$(X_$(3)) \
$$(MKFILE_DEPS)
endif
# Prerequisites for using the stageN compiler to build target artifacts
TSREQ$(1)_T_$(2)_H_$(3) = \
$$(HSREQ$(1)_H_$(3)) \
$$(TLIB$(1)_T_$(2)_H_$(3))/libmorestack.a \
$$(TLIB$(1)_T_$(2)_H_$(3))/libcompiler-rt.a
# Prerequisites for a working stageN compiler and libraries, for a specific
# target
SREQ$(1)_T_$(2)_H_$(3) = \
$$(TSREQ$(1)_T_$(2)_H_$(3)) \
$$(foreach dep,$$(TARGET_CRATES), \
$$(TLIB$(1)_T_$(2)_H_$(3))/stamp.$$(dep))
# Prerequisites for a working stageN compiler and complete set of target
# libraries
CSREQ$(1)_T_$(2)_H_$(3) = \
$$(TSREQ$(1)_T_$(2)_H_$(3)) \
$$(HBIN$(1)_H_$(3))/rustdoc$$(X_$(3)) \
$$(foreach dep,$$(CRATES),$$(TLIB$(1)_T_$(2)_H_$(3))/stamp.$$(dep))
ifeq ($(1),0)
# Don't run the stage0 compiler under valgrind - that ship has sailed
CFG_VALGRIND_COMPILE$(1) =
else
CFG_VALGRIND_COMPILE$(1) = $$(CFG_VALGRIND_COMPILE)
endif
# Add RUSTFLAGS_STAGEN values to the build command
EXTRAFLAGS_STAGE$(1) = $$(RUSTFLAGS_STAGE$(1))
CFGFLAG$(1)_T_$(2)_H_$(3) = stage$(1)
endef
# Same macro/variables as above, but defined in a separate loop so it can use
# all the variables above for all archs. The RPATH_VAR setup sometimes needs to
# reach across triples to get things in order.
#
# Defines (with the standard $(1)_T_$(2)_H_$(3) suffix):
# * `LD_LIBRARY_PATH_ENV_NAME`: the name for the key to use in the OS
# environment to access or extend the lookup path for dynamic
# libraries. Note on Windows, that key is `$PATH`, and thus not
# only conflates programs with dynamic libraries, but also often
# contains spaces which confuse make.
# * `LD_LIBRARY_PATH_ENV_HOSTDIR`: the entry to add to lookup path for the host
# * `LD_LIBRARY_PATH_ENV_TARGETDIR`: the entry to add to lookup path for target
#
# Below that, HOST_RPATH_VAR and TARGET_RPATH_VAR are defined in terms of the
# above settings.
#
define SREQ_CMDS
ifeq ($$(OSTYPE_$(3)),apple-darwin)
LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3) := DYLD_LIBRARY_PATH
else
ifeq ($$(CFG_WINDOWSY_$(3)),1)
LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3) := PATH
else
LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3) := LD_LIBRARY_PATH
endif
endif
LD_LIBRARY_PATH_ENV_HOSTDIR$(1)_T_$(2)_H_$(3) := \
$$(CURDIR)/$$(HLIB$(1)_H_$(3))
LD_LIBRARY_PATH_ENV_TARGETDIR$(1)_T_$(2)_H_$(3) := \
$$(CURDIR)/$$(TLIB1_T_$(2)_H_$(CFG_BUILD))
HOST_RPATH_VAR$(1)_T_$(2)_H_$(3) := \
$$(LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3))=$$(LD_LIBRARY_PATH_ENV_HOSTDIR$(1)_T_$(2)_H_$(3)):$$$$$$(LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3))
TARGET_RPATH_VAR$(1)_T_$(2)_H_$(3) := \
$$(LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3))=$$(LD_LIBRARY_PATH_ENV_TARGETDIR$(1)_T_$(2)_H_$(3)):$$$$$$(LD_LIBRARY_PATH_ENV_NAME$(1)_T_$(2)_H_$(3))
RPATH_VAR$(1)_T_$(2)_H_$(3) := $$(HOST_RPATH_VAR$(1)_T_$(2)_H_$(3))
# Pass --cfg stage0 only for the build->host part of stage0;
# if you're building a cross config, the host->* parts are
# effectively stage1, since it uses the just-built stage0.
#
# This logic is similar to how the LD_LIBRARY_PATH variable must
# change be slightly different when doing cross compilations.
# The build doesn't copy over all target libraries into
# a new directory, so we need to point the library path at
# the build directory where all the target libraries came
# from (the stage0 build host). Otherwise the relative rpaths
# inside of the rustc binary won't get resolved correctly.
ifeq ($(1),0)
ifneq ($(strip $(CFG_BUILD)),$(strip $(3)))
CFGFLAG$(1)_T_$(2)_H_$(3) = stage1
RPATH_VAR$(1)_T_$(2)_H_$(3) := $$(TARGET_RPATH_VAR$(1)_T_$(2)_H_$(3))
endif
endif
STAGE$(1)_T_$(2)_H_$(3) := \
$$(Q)$$(RPATH_VAR$(1)_T_$(2)_H_$(3)) \
$$(call CFG_RUN_TARG_$(3),$(1), \
$$(CFG_VALGRIND_COMPILE$(1)) \
$$(HBIN$(1)_H_$(3))/rustc$$(X_$(3)) \
--cfg $$(CFGFLAG$(1)_T_$(2)_H_$(3)) \
$$(CFG_RUSTC_FLAGS) $$(EXTRAFLAGS_STAGE$(1)) --target=$(2)) \
$$(RUSTC_FLAGS_$(2))
PERF_STAGE$(1)_T_$(2)_H_$(3) := \
$$(Q)$$(call CFG_RUN_TARG_$(3),$(1), \
$$(CFG_PERF_TOOL) \
$$(HBIN$(1)_H_$(3))/rustc$$(X_$(3)) \
--cfg $$(CFGFLAG$(1)_T_$(2)_H_$(3)) \
$$(CFG_RUSTC_FLAGS) $$(EXTRAFLAGS_STAGE$(1)) --target=$(2)) \
$$(RUSTC_FLAGS_$(2))
endef
$(foreach build,$(CFG_HOST), \
$(eval $(foreach target,$(CFG_TARGET), \
$(eval $(foreach stage,$(STAGES), \
$(eval $(call SREQ,$(stage),$(target),$(build))))))))
$(foreach build,$(CFG_HOST), \
$(eval $(foreach target,$(CFG_TARGET), \
$(eval $(foreach stage,$(STAGES), \
$(eval $(call SREQ_CMDS,$(stage),$(target),$(build))))))))
######################################################################
# rustc-H-targets
#
# Builds a functional Rustc for the given host.
######################################################################
define DEF_RUSTC_STAGE_TARGET
# $(1) == architecture
# $(2) == stage
rustc-stage$(2)-H-$(1): \
$$(foreach target,$$(CFG_TARGET),$$(SREQ$(2)_T_$$(target)_H_$(1)))
endef
$(foreach host,$(CFG_HOST), \
$(eval $(foreach stage,1 2 3, \
$(eval $(call DEF_RUSTC_STAGE_TARGET,$(host),$(stage))))))
rustc-stage1: rustc-stage1-H-$(CFG_BUILD)
rustc-stage2: rustc-stage2-H-$(CFG_BUILD)
rustc-stage3: rustc-stage3-H-$(CFG_BUILD)
define DEF_RUSTC_TARGET
# $(1) == architecture
rustc-H-$(1): rustc-stage2-H-$(1)
endef
$(foreach host,$(CFG_TARGET), \
$(eval $(call DEF_RUSTC_TARGET,$(host))))
rustc-stage1: rustc-stage1-H-$(CFG_BUILD)
rustc-stage2: rustc-stage2-H-$(CFG_BUILD)
rustc-stage3: rustc-stage3-H-$(CFG_BUILD)
rustc: rustc-H-$(CFG_BUILD)
rustc-H-all: $(foreach host,$(CFG_HOST),rustc-H-$(host))
######################################################################
# Entrypoint rule
######################################################################
.DEFAULT_GOAL := all
define ALL_TARGET_N
ifneq ($$(findstring $(1),$$(CFG_HOST)),)
# This is a host
all-target-$(1)-host-$(2): $$(CSREQ2_T_$(1)_H_$(2))
else
# This is a target only
all-target-$(1)-host-$(2): $$(SREQ2_T_$(1)_H_$(2))
endif
endef
$(foreach target,$(CFG_TARGET), \
$(foreach host,$(CFG_HOST), \
$(eval $(call ALL_TARGET_N,$(target),$(host)))))
ALL_TARGET_RULES = $(foreach target,$(CFG_TARGET), \
$(foreach host,$(CFG_HOST), \
all-target-$(target)-host-$(host)))
all: $(ALL_TARGET_RULES) $(GENERATED) docs
######################################################################
# Build system documentation
######################################################################
# $(1) is the name of the doc <section> in Makefile.in
# pick everything between tags | remove first line | remove last line
# | remove extra (?) line | strip leading `#` from lines
SHOW_DOCS = $(Q)awk '/<$(1)>/,/<\/$(1)>/' $(S)/Makefile.in | sed '1d' | sed '$$d' | sed 's/^\# \?//'
help:
$(call SHOW_DOCS,help)
tips:
$(call SHOW_DOCS,tips)
nitty-gritty:
$(call SHOW_DOCS,nitty-gritty)
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