[4.0] build failure with --enable-docs

[jcfp]

The release tarball only has api2_{c,go,rust}.rst in doc/manual/basics/api/ but not the ones for all newly supported languages, which causes the build to fail if instructed to regenerate the manpages. The git repo does have the missing files, and building the docs using the github "full repo" source tar.gz works as expected.

To reproduce, try building off the release tarball with ./configure --enable-docs. Tail of the build log:

g++ -DHAVE_CONFIG_H -I.   -Wdate-time -D_FORTIFY_SOURCE=2 -std=c++11  -W  -Wall  -Wextra  -Weffc++  -pedantic  -Wformat=2  -Wredundant-decls  -Wsuggest-attribute=format  -Wconversion  -Wsign-conversion  -Wold-style-cast  -Werror=return-type  -O2  -DRE2C_STDLIB_DIR='"/usr/share/re2c/stdlib/"'  -DRE2C_LANG=Lang::ZIG -DRE2C_PROG=\"re2zig\" -g -O2 -ffile-prefix-map=/build/re2c-4.0=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o src/msg/re2zig-help_re2zig.o `test -f 'src/msg/help_re2zig.cc' || echo './'`src/msg/help_re2zig.cc
/usr/bin/mkdir -p doc
/usr/bin/python3 ./build/split_man.py ./doc/re2c.rst ./doc/re2c.rst \
    && /usr/bin/python3 ./build/rst2man.py --tab-width=4 ./doc/re2c.rst > doc/re2c.1 \
    && cp doc/re2c.1 ./bootstrap/doc/re2c.1
/usr/bin/mkdir -p doc
/usr/bin/python3 ./build/split_man.py ./doc/re2d.rst ./doc/re2d.rst \
    && /usr/bin/python3 ./build/rst2man.py --tab-width=4 ./doc/re2d.rst > doc/re2d.1 \
    && cp doc/re2d.1 ./bootstrap/doc/re2d.1
/usr/bin/mkdir -p doc
/usr/bin/python3 ./build/split_man.py ./doc/re2go.rst ./doc/re2go.rst \
    && /usr/bin/python3 ./build/rst2man.py --tab-width=4 ./doc/re2go.rst > doc/re2go.1 \
    && cp doc/re2go.1 ./bootstrap/doc/re2go.1
./doc/re2d.rst:62: (SEVERE/4) Problems with "include" directive path:
InputError: [Errno 2] No such file or directory: 'doc/manual/basics/api/api2_d.rst_'.
Exiting due to level-4 (SEVERE) system message.
make[3]: *** [Makefile:21066: doc/re2d.1] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/build/re2c-4.0'
make[2]: *** [Makefile:18489: all-recursive] Error 1
make[2]: Leaving directory '/build/re2c-4.0'
make[1]: *** [Makefile:3892: all] Error 2
make[1]: Leaving directory '/build/re2c-4.0'

[skvadrik]

Thanks @jcfp ! Here's a fix: https://github.com/skvadrik/re2c/commit/a1c42047daac4d26befae7b129eaa10ff307c834 (it also makes sure it won't break in the same way next time).

[skvadrik]

I will release 4.0.1 in a few days with this fix and a few more minor things.