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-rw-r--r--frontends/verilog/preproc.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/frontends/verilog/preproc.cc b/frontends/verilog/preproc.cc
index b4e77c31..4e5d1659 100644
--- a/frontends/verilog/preproc.cc
+++ b/frontends/verilog/preproc.cc
@@ -221,7 +221,8 @@ std::string frontend_verilog_preproc(std::istream &f, std::string filename, cons
input_buffer_charp = 0;
input_file(f, filename);
- defines_map["__YOSYS__"] = "1";
+ defines_map["YOSYS"] = "1";
+ defines_map["SYNTHESIS"] = "1";
while (!input_buffer.empty())
{