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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 fb8a7b95..997920b8 100644
--- a/frontends/verilog/preproc.cc
+++ b/frontends/verilog/preproc.cc
@@ -39,6 +39,7 @@
#include <string.h>
YOSYS_NAMESPACE_BEGIN
+using namespace VERILOG_FRONTEND;
static std::list<std::string> output_code;
static std::list<std::string> input_buffer;
@@ -222,7 +223,7 @@ std::string frontend_verilog_preproc(std::istream &f, std::string filename, cons
input_file(f, filename);
defines_map["YOSYS"] = "1";
- defines_map["SYNTHESIS"] = "1";
+ defines_map[formal_mode ? "FORMAL" : "SYNTHESIS"] = "1";
while (!input_buffer.empty())
{