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Make logging cost free when there is no output target (#12247)

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The logging streams now do almost no work when there is no output target for them.

For example, if LL_VERBOSE has no output targets, then `verbosestream << x` will return a StreamProxy with a null target. Any further `<<` operations applied to it will do nothing.
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paradust7 2022-05-04 11:55:01 -07:00 • committed by GitHub
parent ae7664597e
commit 0704ca0550
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14 changed files with 336 additions and 192 deletions
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5
minetest.conf.example
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@ -1768,7 +1768,8 @@
# - action
# - info
# - verbose
# type: enum values: , none, error, warning, action, info, verbose
# - trace
# type: enum values: , none, error, warning, action, info, verbose, trace
# debug_log_level = action
# If the file size of debug.txt exceeds the number of megabytes specified in
@ -1779,7 +1780,7 @@
# debug_log_size_max = 50
# Minimal level of logging to be written to chat.
# type: enum values: , none, error, warning, action, info, verbose
# type: enum values: , none, error, warning, action, info, verbose, trace
# chat_log_level = error
# Enable IPv6 support (for both client and server).