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b14e89e322
A lot of _SRC, _INC, _LIB etc variables are set and expected to be
initialized to an empty string by default. However, an in-depth
review of all of them showed that WOLFSSL_{INC,LIB}, SSL_{INC,LIB},
LUA_{INC,LIB}, and maybe others were not always initialized and could
sometimes leak from the environment and as such cause strange build
issues when running from cascaded scripts that had exported them.
The approach taken here consists in iterating over all USE_* options
and unsetting any _SRC, _INC, _LIB, _CFLAGS and _LDFLAGS that follows
the same name. For the few variable names options that don't exactly
match the build option (SSL & WOLFSSL), these ones are specifically
added to the list. The few that were explicitly cleared in their own
sections were just removed since not needed anymore. Note that an
"undefine" command appeared in GNU make 3.82 but since we support
older ones we can only initialize the variables to an empty string
here. It's not a problem in practice.
We're now certain that these variables are empty wherever they are
used, and that it is possible to just append to them, or use them
as-is.
40 lines
2.1 KiB
Makefile
40 lines
2.1 KiB
Makefile
# this contains various functions and macros used to manipulate USE_* options
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# and their flags
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# Depending on the target platform, some options are set, as well as some
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# CFLAGS and LDFLAGS. All variables pre-set here will not appear in the build
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# options string. They may be set to any value, but are historically set to
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# "implicit" which eases debugging. You should not have to change anything
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# there unless you're adding support for a new platform.
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default_opts = $(foreach name,$(1),$(eval $(name)=implicit))
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# Return USE_xxx=$(USE_xxx) if the variable was set from the environment or the
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# command line.
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ignore_implicit = $(if $(subst environment,,$(origin $(1))), \
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$(if $(subst command line,,$(origin $(1))),, \
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$(1)=$($(1))), \
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$(1)=$($(1))) \
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# This macro collects all USE_* values except those set to "implicit". This
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# is used to report a list of all flags which were used to build this version.
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# Do not assign anything to it.
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build_options = $(foreach opt,$(use_opts),$(call ignore_implicit,$(opt)))
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# Make a list of all known features with +/- prepended depending on their
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# activation status. Must be a macro so that dynamically enabled ones are
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# evaluated with their current status.
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build_features = $(foreach opt,$(patsubst USE_%,%,$(sort $(use_opts))),$(if $(USE_$(opt)),+$(opt),-$(opt)))
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# This returns a list of -DUSE_* for all known USE_* that are set
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opts_as_defines = $(foreach opt,$(use_opts),$(if $($(opt)),-D$(opt),))
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# Lists all enabled or disabled options without the "USE_" prefix
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enabled_opts = $(foreach opt,$(patsubst USE_%,%,$(use_opts)),$(if $(USE_$(opt)),$(opt),))
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disabled_opts = $(foreach opt,$(patsubst USE_%,%,$(use_opts)),$(if $(USE_$(opt)),,$(opt)))
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# preset all XXX_{INC,LIB,CFLAGS,LDFLAGS,SRC} variables to empty for $1=XXX
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reset_opt_vars = $(foreach name,INC LIB CFLAGS LDFLAGS SRC,$(eval $(1)_$(name)=))
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# preset all variables for all supported build options among use_opts
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reset_opts_vars = $(foreach opt,$(patsubst USE_%,%,$(use_opts)) SSL WOLFSSL,$(call reset_opt_vars,$(opt)))
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