Bug#1015712: yosys: ftbfs with LTO (link time optimization) enabled

[Matthias Klose]

Package: src:yosys
Version: 0.15-1
Severity: minor
Tags: sid bookworm
User: debian-gcc at lists.debian.org
Usertags: ftbfs-lto

This package currently fails to build (at least on the amd64
architecture) with link time optimizations enabled.  For a background
for LTO please see

https://wiki.debian.org/ToolChain/LTO

The goal is to enable this optimization by default in an upcoming
Debian release in dpkg-buildflags for 64bit architectures.  The goal
is to get this package to build with link time optimizations, or to
explicitly disable link time optimizations for this package build.

To reproduce the build failure, enable the lto optimization in
testing/unstable by adding "optimize=+lto" to DEB_BUILD_MAINT_OPTIONS
in the debian/rules file, or if this macro is unset, just set it:

export DEB_BUILD_MAINT_OPTIONS = optimize=+lto

Please try to fix the build with lto enabled, fixing the packaging or
forwarding the issue upstream. If the issue cannot be fixed,
explicitly disallow building the package with lto by adding to your
rules file:

export DEB_BUILD_MAINT_OPTIONS = optimize=-lto

or adding that string to your existing setting of DEB_BUILD_MAINT_OPTIONS.

The full build log can be found at:
http://qa-logs.debian.net/2022/06/09/dpkglto/yosys_0.15-1_unstable_dpkglto.log
The last lines of the build log are at the end of this report.

[...]

16. Executing ABC pass (technology mapping using ABC).

16.1. Extracting gate netlist of module `\counter' to `<abc-temp-dir>/input.blif'..
Extracted 6 gates and 11 wires to a netlist network with 4 inputs and 2 outputs.

16.1.1. Executing ABC.
Running ABC command: berkeley-abc -s -f <abc-temp-dir>/abc.script 2>&1
ABC: ABC command line: "source <abc-temp-dir>/abc.script".
ABC: 
ABC: + read_blif <abc-temp-dir>/input.blif 
ABC: + read_lib -w <yosys-exe-dir>/manual/PRESENTATION_Intro/mycells.lib 
ABC: Parsing finished successfully.  Parsing time =     0.00 sec
ABC: Warning: Templates are not defined.
ABC: Libery parser cannot read "time_unit".  Assuming   time_unit : "1ns".
ABC: Libery parser cannot read "capacitive_load_unit". Assuming   capacitive_load_unit(1, pf).
ABC: Scl_LibertyReadGenlib() skipped sequential cell "DFF".
ABC: Library "demo" from "<yosys-exe-dir>/manual/PRESENTATION_Intro/mycells.lib" has 4 cells (1 skipped: 1 seq; 0 tri-state; 0 no func; 0 dont_use).  Time =     0.00 sec
ABC: Memory =    0.00 MB. Time =     0.00 sec
ABC: + strash 
ABC: + ifraig 
ABC: + scorr 
ABC: Warning: The network is combinational (run "fraig" or "fraig_sweep").
ABC: + dc2 
ABC: + dretime 
ABC: + strash 
ABC: + &get -n 
ABC: + &dch -f 
ABC: + &nf 
ABC: + &put 
ABC: + write_blif <abc-temp-dir>/output.blif 

16.1.2. Re-integrating ABC results.
ABC RESULTS:              NAND cells:        4
ABC RESULTS:               NOR cells:        4
ABC RESULTS:               NOT cells:        3
ABC RESULTS:        internal signals:        5
ABC RESULTS:           input signals:        4
ABC RESULTS:          output signals:        2
Removing temp directory.
Removed 0 unused cells and 10 unused wires.

17. Generating Graphviz representation of design.

17.1. Executing Verilog-2005 frontend: mycells.v
Parsing Verilog input from `mycells.v' to AST representation.
Generating RTLIL representation for module `\NOT'.
Generating RTLIL representation for module `\NAND'.
Generating RTLIL representation for module `\NOR'.
Generating RTLIL representation for module `\DFF'.
Successfully finished Verilog frontend.

17.2. Continuing show pass.
Writing dot description to `counter_03.dot'.
Dumping module counter to page 1.
Exec: dot -Tpdf 'counter_03.dot' > 'counter_03.pdf.new' && mv 'counter_03.pdf.new' 'counter_03.pdf'

End of script. Logfile hash: 3ebf0f4e86, CPU: user 0.11s system 0.01s, MEM: 12.60 MB peak
Yosys 0.15 (git sha1 2156e20)
Time spent: 43% 4x show (0 sec), 23% 1x abc (0 sec), ...
make[3]: *** [Makefile:5: counter_00.pdf] Segmentation fault
make[3]: *** Deleting file 'counter_00.pdf'
make[3]: Leaving directory '/<<PKGBUILDDIR>>/manual/PRESENTATION_Intro'
make[2]: *** [Makefile:905: manual] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: error: make -j8 "INSTALL=install --strip-program=true" GIT_REV=2156e20 ABCEXTERNAL=berkeley-abc ABCPULL=0 STRIP=: all manual returned exit code 2
make[1]: *** [debian/rules:48: override_dh_auto_build-indep] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:22: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2