Bug#1082747: cod-tools: FTBFS (only) on riscv64

Source: cod-tools
Version: 3.10.0+dfsg-1.1
Severity: serious
Tags: help ftbfs
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: [email protected], [email protected]
User: [email protected]
Usertags: perl-5.40-transition

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I noticed that cod-tools 3.10.0+dfsg-1.1 fails to build but only on
riscv64:

https://buildd.debian.org/status/package.php?p=cod-tools
https://buildd.debian.org/status/logs.php?pkg=cod-tools

I care about this issue because 1) I uploaded the -1.1 NMU, and 2)
this will get in the way of the Perl 5.40 transition (#1082293),
which was the reason for the NMU in the first place, as it blocks the
migration of cod-tools.

Observations and thoughts:
* -1 built everywhere, including riscv64
* -1.1 still builds everywhere, except for riscv64
* I don't think the changes from the NMU (Niko's Perl exporter()
  patch) are related
* The build on riscv64 failed 4 times, so not a
  parallelization/timing issue probably (and d/rules uses
  --no-parallel)

On riscv64 the build fails with

#v+
tools/help2man scripts/utf8-to-cif --bugs-email [email protected] > doc/man/utf8-to-cif.1
make[1]: *** No rule to make target 'doc/man/cif_list_tags.1', needed by 'man'.  Stop.
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
v-

On amd64 we see:

#v+
tools/help2man scripts/utf8-to-cif --bugs-email [email protected] > doc/man/utf8-to-cif.1
src/components/codcif/cif_list_tags --help | tools/help2man --stdin --name cif_list_tags --bugs-email [email protected] > doc/man/cif_list_tags.1
src/components/codcif/cifparse --help | tools/help2man --stdin --name cifparse --bugs-email [email protected] > doc/man/cifparse.1
src/components/codcif/cifvalues --help | tools/help2man --stdin --name cifvalues --bugs-email [email protected] > doc/man/cifvalues.1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
#v-

So it looks like src/components/codcif/cif_list_tags exists on amd64
et al., but not in riscv64.
  
The compliation step on amd64:

#v+
gcc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wall -Wsign-compare -g -O3 -funroll-loops -fomit-frame-pointer -foptimize-register-move -DYYDEBUG=1 -D_YACC_ -I. -I../../externals/cexceptions -I../../externals/getoptions -fPIC -DSVN_VERSION="\"10068\""  -Wl,-z,relro -Wl,-z,now -o cif_list_tags programs/cif_list_tags.c obj/cif2_grammar.tab.o obj/cif_grammar.tab.o lib/libcodcif.a ../../externals/cexceptions/lib/libcexceptions.a ../../externals/getoptions/lib/libgetoptions.a version.h -lm
#v-

and on riscv64:

#v+
gcc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wsign-compare -g -O3 -funroll-loops -fomit-frame-pointer -foptimize-register-move -DYYDEBUG=1 -D_YACC_ -I. -I../../externals/cexceptions -I../../externals/getoptions -fPIC -DSVN_VERSION="\"10068\""  -Wl,-z,relro -Wl,-z,now -o cif_list_tags programs/cif_list_tags.c obj/cif2_grammar.tab.o obj/cif_grammar.tab.o lib/libcodcif.a ../../externals/cexceptions/lib/libcexceptions.a ../../externals/getoptions/lib/libgetoptions.a version.h -lm
#v-


I've been staring at the logs for some time but haven't found out
what's happening here on riscv64; help welcome.


Cheers,
gregor

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