Hi, It appears that YACC rules don't check for whether the destination directory exists before executing ylwrap.
When trying to package libaacs (https://code.videolan.org/videolan/libaacs) with an out-of-source build, I hit an unexpected build failure: ``` /var/tmp/portage/media-libs/libaacs-0.11.1/work/libaacs-0.11.1/src/file/keydbcfg-parser.y: warning: fix-its can be applied. Rerun with option '--update'. [-Wother] /var/tmp/portage/media-libs/libaacs-0.11.1/work/libaacs-0.11.1/build-aux/ylwrap: 206: cannot create ../src/file/keydbcfg-parser.c: Directory nonexistent updating src/file/keydbcfg-parser.h mv: cannot move 'tmp-keydbcfg-parser.h' to '../src/file/keydbcfg-parser.h': No such file or directory make: *** [Makefile:1150: src/file/keydbcfg-parser.c] Error 2 ``` I can workaround this by running `mkdir -p ${BUILD_DIR}/src/file` to ensure that the necessary directory exists within the build directory beforehand, but it feels like I shouldn't have to. Their Makefile.am can be found here: https://code.videolan.org/videolan/libaacs/-/blob/master/Makefile.am. Snippet: ``` libaacs_la_SOURCES=\ src/libaacs/aacs.h \ [...] src/file/dirs.h \ src/file/file.h \ src/file/file.c \ src/file/filesystem.h \ src/file/filesystem.c \ src/file/keydbcfg.c \ src/file/keydbcfg.h \ src/file/keydb.h \ src/file/keydbcfg-parser.y \ src/file/keydbcfg-lexer.l \ src/file/mmc_device.h \ [...] ``` While src/libaacs exists within the build dir, src/file/ doesn't exist at all, hence the failure. automake yacc rules should mkdir -p the needed directories within the build dir for VPATH builds before running ylwrap/yacc. Best, sam
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