cmake: GenerateHeaderFrom very slow #30881

1. 
   fanquake commented at 2:57 pm on September 12, 2024: member

   Looks like a regression from #30842. Reported in that PR: #30842 (comment):

   0Not sure why, but for me the command took almost an hour:
   1
   2$ ps -p 816447 --format time,rss,cmd
   3    TIME   RSS CMD
   400:51:12 117640 /usr/bin/cmake -DRAW_SOURCE_PATH=_/src/bench/data/block413567.raw -DHEADER_PATH=_/bld-cmake/src/bench/data/block413567.raw.h -DRAW_NAMESPACE=benchmark::data -P _/cmake/script/GenerateHeaderFromRaw.cmake
   5
   6Previously it took only a few seconds.
   

   and on IRC:

   01090551 pts/1    S+     0:00 /bin/sh -c cd /home/pw/git/bitcoin/build_dev_mode/src/bench && /usr/bin/cmake -DRAW_SOURCE_PATH=/home/pw/git/bi
   11090553 pts/1    R+     2:20 /usr/bin/cmake -DRAW_SOURCE_PATH=/home/pw/git/bitcoin/src/bench/data/block413567.raw -DHEADER_PATH=/home/pw/g
   2anyone have a clue why building block413567.raw.h seems to take forever?
   

2. fanquake added the label Build system on Sep 12, 2024
3. 
   sipa commented at 2:59 pm on September 12, 2024: member

   Reverting #30842 fixes the issue for me.
4. 
   hebasto commented at 3:40 pm on September 12, 2024: member

   Reverting #30842 fixes the issue for me.

   Done in #30883.

5. fanquake closed this on Sep 12, 2024

   ---

6. fanquake referenced this in commit 07c7c96022 on Sep 12, 2024
7. 
   l0rinc commented at 6:55 pm on September 12, 2024: contributor

   Fixed in https://github.com/bitcoin/bitcoin/pull/30888

Contributors
fanquake sipa hebasto l0rinc

Labels
Build system