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synth: load the slang plugin when read_slang is not built in #4476

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synth: load the slang plugin when read_slang is not built in #4476

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9 changes: 8 additions & 1 deletion flow/scripts/synth_preamble.tcl
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Expand Up @@ -76,7 +76,14 @@ proc read_design_sources { } {
}

if { [env_var_equals SYNTH_HDL_FRONTEND slang] } {
# read_slang is built into Yosys (>=0.67); no plugin load needed.
# read_slang is built into Yosys >= 0.67, which vendors the frontend
# under frontends/slang. Older Yosys needs the same code loaded as an
# out-of-tree plugin; `plugin -i` finds it on YOSYS_PLUGIN_PATH. The
# guard makes this a no-op on a Yosys that has the frontend built in,
# so a build system is free to supply either one.
if { [info commands read_slang] eq "" } {
plugin -i slang
}
set slang_args [list \
-D SYNTHESIS --keep-hierarchy --compat=vcs --ignore-assertions --top $::env(DESIGN_NAME) \
{*}$vIdirsArgs {*}[env_var_or_empty VERILOG_DEFINES]]
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