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BUILD: makefile: warn about unknown USE_* variables

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William suggested that it would be nice to warn about unknown USE_*
variables to more easily catch misspelled ones. The valid ones are
present in use_opts, so by appending "=%" to each of them, we can
build a series of patterns to exclude from MAKEOVERRIDES and emit
a warning for the ones that stand out.

Example:

  $ make TARGET=linux-glibc  USE_QUIC_COMPAT_OPENSSL=1
  Makefile:338: Warning: ignoring unknown build option: USE_QUIC_COMPAT_OPENSSL=1
    CC      src/slz.o
This commit is contained in:
Willy Tarreau
2024-04-11 08:27:18 +02:00
parent 1fa6eb2eb9
commit aa32ab13f0
2 changed files with 15 additions and 0 deletions
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3
Makefile
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@@ -322,6 +322,9 @@ use_opts = USE_EPOLL USE_KQUEUE USE_NETFILTER USE_POLL \
# preset all variables for all supported build options among use_opts
$(reset_opts_vars)
# Check that any USE_* variable that was forced actually exist.
$(warn_unknown_options)
#### Target system options
# poll() is always supported, unless explicitly disabled by passing USE_POLL=""