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BUILD: makefile: clarify the "help" output and list options

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The list of enable and disabled build options now appears separately
at the end of "make help". This is convenient to know what is enabled
by default on a given target. For example :

  $ make help TARGET=linux2628
  Enabled features for TARGET 'linux2628' (disable with 'USE_xxx=') :
    EPOLL NETFILTER POLL THREAD TPROXY LINUX_TPROXY LINUX_SPLICE LIBCRYPT
    CRYPT_H FUTEX ACCEPT4 CPU_AFFINITY DL RT PRCTL THREAD_DUMP

  Disabled features for TARGET 'linux2628' (enable with 'USE_xxx=1') :
    KQUEUE MY_EPOLL MY_SPLICE PCRE PCRE_JIT PCRE2 PCRE2_JIT PRIVATE_CACHE
    PTHREAD_PSHARED REGPARM STATIC_PCRE STATIC_PCRE2 VSYSCALL GETADDRINFO
    OPENSSL LUA MY_ACCEPT4 ZLIB SLZ TFO NS DEVICEATLAS 51DEGREES WURFL
    SYSTEMD OBSOLETE_LINKER EVPORTS
This commit is contained in:
Willy Tarreau 2019-06-14 15:52:01 +02:00
parent 4d03e431b3
commit 50b1aaeffc
1 changed files with 20 additions and 3 deletions
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23
Makefile
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@ -1,7 +1,11 @@
# This GNU Makefile supports different OS and CPU combinations.
#
# You should use it this way :
# [g]make TARGET=os ARCH=arch CPU=cpu USE_xxx=1 ...
# [g]make TARGET=os [ARCH=arch] [CPU=cpu] USE_xxx=1 ...
#
# When in doubt, invoke help, possibly with a known target :
# [g]make help
# [g]make help TARGET=linux
#
# By default the detailed commands are hidden for a cleaner output, but you may
# see them by appending "V=1" to the make command.
@ -54,7 +58,8 @@
# USE_THREAD_DUMP : use the more advanced thread state dump system. Automatic.
#
# Options can be forced by specifying "USE_xxx=1" or can be disabled by using
# "USE_xxx=" (empty string).
# "USE_xxx=" (empty string). The list of enabled and disabled options for a
# given TARGET is enumerated at the end of "make help".
#
# Variables useful for packagers :
# CC is set to "gcc" by default and is used for compilation only.
@ -812,7 +817,19 @@ INCLUDES = $(wildcard include/*/*.h ebtree/*.h)
DEP = $(INCLUDES) .build_opts
help:
$(Q)sed -ne "/^[^#]*$$/q;s/^#\(.*\)/\1/p" Makefile
$(Q)sed -ne "/^[^#]*$$/q;s/^# \?\(.*\)/\1/p" Makefile
$(Q)echo; \
if [ -n "$(TARGET)" ]; then \
echo -n "Current TARGET: $(TARGET)"; \
if [ -z "$(set_target_defaults)" ]; then echo -n " (custom target)";fi; \
else \
echo -n "TARGET not set."; \
fi; \
echo
$(Q)echo;echo "Enabled features for TARGET '$(TARGET)' (disable with 'USE_xxx=') :"
$(Q)set -- $(foreach opt,$(patsubst USE_%,%,$(use_opts)),$(if $(USE_$(opt)),$(opt),)); echo " $$*" | (fmt || cat) 2>/dev/null
$(Q)echo;echo "Disabled features for TARGET '$(TARGET)' (enable with 'USE_xxx=1') :"
$(Q)set -- $(foreach opt,$(patsubst USE_%,%,$(use_opts)),$(if $(USE_$(opt)),,$(opt))); echo " $$*" | (fmt || cat) 2>/dev/null
# Used only to force a rebuild if some build options change
build_opts = $(shell rm -f .build_opts.new; echo \'$(TARGET) $(BUILD_OPTIONS) $(VERBOSE_CFLAGS)\' > .build_opts.new; if cmp -s .build_opts .build_opts.new; then rm -f .build_opts.new; else mv -f .build_opts.new .build_opts; fi)