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

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)