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  1. Couchbase Server
  2. MB-46988

CCache giving "preprocessor error" for targets using precompiled headers

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    • Untriaged
    • 1
    • Unknown
    • KV-Engine Sprint 2021 June

    Description

      With the introduction of precompiled headers for targets in platform and kv_engine (MB-43677), I'm seeing ccache no longer work (find a matching cached object file) for targets using precompiled headers.

      Instead, 'ccache -s' reports 'preprocessor error':

      cache hit (direct)                     0
      		 
      cache hit (preprocessed)               0
      		 
      cache miss                             1
      		 
      cache hit rate                      0.00 %
      		 
      preprocessor error                     1

      Enabling ccache debug mode and examinind a log file for a failing
      object, we see the following:

      [2021-06-17T10:57:43.280809 15720] Running preprocessor
      		 
       [2021-06-17T10:57:43.280850 15720] Executing /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ <cut> -E ../platform/src/je_arena_malloc_stats.cc
      		 
      [2021-06-17T10:57:43.508729 15720] Preprocessor gave exit status 1
      		 
      [2021-06-17T10:57:43.508839 15720] Failed; falling back to running the real compiler
      		 
       [2021-06-17T10:57:43.509102 15720] Result: preprocessor error

      i.e. it failed to invoke the preprocessor (via c++ -E) and hence
      couldn't lookup the file in the cache.

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          is caused by

          Task - A task that needs to be done. MB-43677 Enable precompiled headers for KV-Engine build

          • Major - Major loss of function.
          • Closed
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              drigby Dave Rigby (Inactive)
              drigby Dave Rigby (Inactive)
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                Resolved:

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