component/ghostscript: Workaround for slaprunner paths with double slashs
This tessdata path will be included in cpp code by pre-processor macros https://github.com/ArtifexSoftware/ghostpdl/blob/gs9.54.0/base/tessocr.cpp#L188-L193 Since // is the marker for a comment in cpp and as documented in https://gcc.gnu.org/onlinedocs/cpp/Stringizing.html "Comments are replaced by whitespace long before stringizing happens, so they never appear in stringized text", the STRINGIFY/STRINGIFY2 approach of including a path does not work when the path contain // , because anything after // is considered a comment and is not included, causing errors like this when using ghostscript with OCR in webrunner: $ strace -e open -o open.strace /srv/slapgrid/slappart42/srv/runner/shared/ghostscript/4387fe7a8d2034ac5691d43b58134248/bin/gs -sDEVICE=ocr GPL Ghostscript 9.54.0 (2021-03-30) Copyright (C) 2021 Artifex Software, Inc. All rights reserved. This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY: see the file COPYING for details. Error opening data file ./eng.traineddata Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory. Failed loading language 'eng' Tesseract couldn't load any languages! **** Unable to open the initial device, quitting. $ grep eng open.strace open("./eng.traineddata", O_RDONLY) = -1 ENOENT (No such file or directory) open("/srv/slapgrid/slappart42/srv/eng.traineddata", O_RDONLY) = -1 ENOENT (No such file or directory) open("eng.traineddata", O_RDONLY) = -1 ENOENT (No such file or directory) eng.traineddata is looked up in /srv/slapgrid/slappart42/srv/ because ghostscript was configured with: --with-tessdata=/srv/slapgrid/slappart42/srv//runner//shared/ghostscript/4387fe7a8d2034ac5691d43b58134248/share/tessdata/ and everything after // was stripped. This was reported upstream as https://bugs.ghostscript.com/show_bug.cgi?id=703905 More about the case of // in slaprunner paths was on commit eb544196 (slparunner: document the reasons why we keep srv//slaprunner, 2019-10-10)
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