CMake: Linux fixes + Merge fallout fix

cmake/SilimateConfig.cmake

@@ -1,8 +1,13 @@
 # Always force disable GNU Readline, GPL trap library
-set(YOSYS_ENABLE_READLINE OFF CACHE INTERNAL "")
+set(YOSYS_ENABLE_READLINE OFF CACHE BOOL "" FORCE)
+set(YOSYS_WITHOUT_READLINE ON CACHE BOOL "" FORCE)
 # Silimate fork has Verific in top-level directory
 set(YOSYS_VERIFIC_DIR ${PROJECT_SOURCE_DIR}/verific)
 # Pyosys is the primary interface for the Silimate fork
 set(YOSYS_WITH_PYTHON ON CACHE BOOL "" FORCE)
 
 add_library(verific INTERFACE)
+
+if (LINUX)
+	add_link_options("-Wl,--allow-multiple-definition")
+endif()

cmake/SilimateVerific-merge-archive.py

@@ -44,7 +44,10 @@ for archive in filter(lambda x: x.endswith(".a"), files):
 	object_dir.mkdir(parents=True, exist_ok=True)
 	subprocess.check_call(["ar", "x", archive], cwd=object_dir)
 	for object in object_dir.glob("*.o"):
-		if len(symbol_localize_args):
+		# on GNU/Linux we just use -Wl,--allow-multiple-definition; redefinitions
+		# are ignored, and the Silimate objects are first in the archive, so they
+		# are prioritized
+		if sys.platform == "darwin" and len(symbol_localize_args):
 			subprocess.check_call([objcopy_bin, *symbol_localize_args, object])
 		final_archive_objects.append(object)
 

kernel/rtlil.cc

@@ -28,7 +28,6 @@
 #include "backends/rtlil/rtlil_backend.h"
 
 #include <string.h>
-#include <strstream>
 #include <algorithm>
 #include <charconv>
 #include <optional>

passes/techmap/abc.cc

@@ -156,6 +156,14 @@ struct AbcConfig
 	int abc_max_node_retention_origins = 5; // number of node retention origins (default 5)
 	std::string signal_map_file;
 	std::string cdc_file;
+
+	bool is_yosys_abc() const {
+#ifdef ABCEXTERNAL
+		return false;
+#else
+		return exe_file == yosys_abc_executable;
+#endif
+	}
 };
 
 struct AbcSigVal {

silimate-shell.nix

@@ -0,0 +1,53 @@
+{ pkgs ? import <nixpkgs> {} }:
+	let libs = pkgs.libs;
+	binutils = pkgs.binutils;
+	gnu-ar = pkgs.stdenvNoCC.mkDerivation {
+		# match homebrew name
+		pname = "gnu-ar";
+		inherit (binutils) version;
+
+		buildInputs = [ binutils ];
+
+		phases = ["installPhase"];
+
+		installPhase = ''
+			mkdir -p $out/bin
+			ln -s ${binutils}/bin/ar $out/bin/gar
+		'';
+	};
+in
+pkgs.mkShell {
+	buildInputs = with pkgs; [
+		bison
+		flex
+		cmake
+		eigen
+		swig
+		boost
+		libedit
+		pkg-config
+		m4
+		cmake
+		ninja
+		tcl
+		libffi
+		nodejs
+		gawk
+		gperf
+		autoconf
+		libdwarf # provides libdwarf.so
+		libelf # provides libelf.a
+		doxygen
+		cudd
+		zlib
+		clang
+		iverilog # tests
+		gtkwave # vcd2fst
+		(python3.withPackages(ps: with ps; [pybind11 cxxheaderparser]))
+		gnu-ar
+	] ++ lib.optionals stdenv.isLinux [
+		elfutils # provides libdw.so (not to be confused with libdwarf.so)
+	];
+
+	cmakeFlags = [ "-DCMAKE_C_COMPILER=clang" "-DCMAKE_CXX_COMPILER=clang++" "-DCMAKE_BUILD_TYPE=Debug" "-DCMAKE_CXX_FLAGS=-O0" "-DYOSYS_WITH_PYTHON:BOOL=ON" ];
+}