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verilog_simulation = Builder(
    action='iverilog -o $TARGET $VDLINCLUDES $SOURCES',
    suffix='.vvp', src_suffix='.v')

env = Environment(BUILDERS = {'GenSim' : verilog_simulation})

env['VDLINCLUDES'] = "-I ./include"

generic_sources = [
    'generic/gen_pipe.v'
]

math_sources = [
    generic_sources,
    'math/flt2int.v',
    'math/flt_add_sub.v',
    'math/flt_det.v',
    'math/flt_frac_test.v',
    'math/flt_fx_23p9.v',
    'math/flt_fx_mult.v',
    'math/flt_fx_uv.v',
    'math/flt_int.v',
    'math/flt_mult.v',
    #'math/flt_recip_orig.v',
    'math/log2_table.v',
    'math/sv_log2.v',
    'math/flt_add_sub_comb.v',
    'math/flt_alu.v',
    'math/flt_div.v',
    'math/flt_fx1616_mult.v',
    'math/flt_fx_24p8.v',
    'math/flt_fx_rnd.v',
    'math/flt_fx.v',
    'math/flt_mult_comb.v',
    'math/flt_recip_fast.v',
    #'math/flt_recip.v',
    #'math/real_log2_table.v'
]

env.GenSim('clk_gen/clk_gen.v')
env.GenSim('clk_switch/clk_switch.v')
env.GenSim('math/math', math_sources)

user@desktop hdl :) $ scons
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
iverilog -o clk_gen/clk_gen.vvp -I ./include clk_gen/clk_gen.v
iverilog -o clk_switch/clk_switch.vvp -I ./include clk_switch/clk_switch.v
iverilog -o math/math.vvp -I ./include generic/gen_pipe.v math/flt2int.v math/flt_add_sub.v math/flt_det.v math/flt_frac_test.v math/flt_fx_23p9.v math/flt_fx_mult.v math/flt_fx_uv.v math/flt_int.v math/flt_mult.v math/log2_table.v math/sv_log2.v math/flt_add_sub_comb.v math/flt_alu.v math/flt_div.v math/flt_fx1616_mult.v math/flt_fx_24p8.v math/flt_fx_rnd.v math/flt_fx.v math/flt_mult_comb.v math/flt_recip_fast.v
scons: done building targets.
user@desktop hdl :) $ math/math.vvp
SORRY: math/sv_log2.v:62: $log() is not available in Icarus verilog.
user@desktop hdl :) $ 

verilator -Mdir obj_release/math --cc -sv -Wno-fatal -I./include obj_release/math/flt2int.v obj_release/math/flt_add_sub.v obj_release/math/flt_det.v obj_release/math/flt_frac_test.v obj_release/math/flt_fx_23p9.v obj_release/math/flt_fx_mult.v obj_release/math/flt_fx_uv.v obj_release/math/flt_int.v obj_release/math/flt_mult.v obj_release/math/log2_table.v obj_release/math/sv_log2.v obj_release/math/flt_add_sub_comb.v obj_release/math/flt_alu.v obj_release/math/flt_div.v obj_release/math/flt_fx1616_mult.v obj_release/math/flt_fx_24p8.v obj_release/math/flt_fx_rnd.v obj_release/math/flt_fx.v obj_release/math/flt_mult_comb.v obj_release/math/flt_recip_fast.v generic/gen_pipe.v
%Error: obj_release/math/sv_log2.v:62: Unsupported or unknown PLI call: $log
%Warning-STMTDLY: obj_release/math/sv_log2.v:63: Unsupported: Ignoring delay on this delayed statement.
%Warning-STMTDLY: Use "/* verilator lint_off STMTDLY */" and lint_on around source to disable this message.