wheels: fix builds, add linux aarch64 to ci

Essentially, something is attempting to build the Yosys EXE when you build libyosys.so now. With `ENABLE_PYTHON_CONFIG_EMBED=0`, the Yosys EXE will always fail to build.

Furthermore, because `ENABLE_PYOSYS` now attempts to build a wheel, building a wheel has become recursive.

This commit uses a supplementary set of libs for the EXE (EXE_LIBS) so it and libyosys.so can be built simultaneously, as well as a new Makefile flag, `ENABLE_WHEEL`, to prevent the aforementioned recursion.

I also enabled aarch64 Linux in the CI because it's publicly available now.

.github/workflows/wheels.yml

@@ -14,16 +14,12 @@ jobs:
               runner: "ubuntu-22.04",
               archs: "x86_64",
             },
-            ## Aarch64 is disabled for now: GitHub is committing to EOY
-            ## for free aarch64 runners for open-source projects and
-            ## emulation times out:
-            ## https://github.com/orgs/community/discussions/19197#discussioncomment-10550689
-            # {
-            #   name: "Ubuntu 22.04",
-            #   family: "linux",
-            #   runner: "ubuntu-22.04",
-            #   archs: "aarch64",
-            # },
+            {
+              name: "Ubuntu 22.04",
+              family: "linux",
+              runner: "ubuntu-22.04-arm",
+              archs: "aarch64",
+            },
             {
               name: "macOS 13",
               family: "macos",

Makefile

@@ -27,6 +27,7 @@ ENABLE_ZLIB := 1
 
 # python wrappers
 ENABLE_PYOSYS := 0
+ENABLE_WHEEL := $(ENABLE_PYOSYS)
 
 # other configuration flags
 ENABLE_GCOV := 0
@@ -102,6 +103,7 @@ LIBS := $(LIBS) -lstdc++ -lm
 PLUGIN_LINKFLAGS :=
 PLUGIN_LIBS :=
 EXE_LINKFLAGS :=
+EXE_LIBS :=
 ifeq ($(OS), MINGW)
 EXE_LINKFLAGS := -Wl,--export-all-symbols -Wl,--out-implib,libyosys_exe.a
 PLUGIN_LINKFLAGS += -L"$(LIBDIR)"
@@ -209,11 +211,11 @@ PYTHON_VERSION_TESTCODE := "import sys;t='{v[0]}.{v[1]}'.format(v=list(sys.versi
 PYTHON_VERSION := $(shell $(PYTHON_EXECUTABLE) -c ""$(PYTHON_VERSION_TESTCODE)"")
 PYTHON_MAJOR_VERSION := $(shell echo $(PYTHON_VERSION) | cut -f1 -d.)
 
-ENABLE_PYTHON_CONFIG_EMBED ?= $(shell $(PYTHON_EXECUTABLE)-config --embed --libs > /dev/null && echo 1)
-ifeq ($(ENABLE_PYTHON_CONFIG_EMBED),1)
-PYTHON_CONFIG := $(PYTHON_EXECUTABLE)-config --embed
-else
 PYTHON_CONFIG := $(PYTHON_EXECUTABLE)-config
+PYTHON_CONFIG_FOR_EXE := $(PYTHON_CONFIG)
+PYTHON_CONFIG_EMBED_AVAILABLE ?= $(shell $(PYTHON_EXECUTABLE)-config --embed --libs > /dev/null && echo 1)
+ifeq ($(PYTHON_CONFIG_EMBED_AVAILABLE),1)
+PYTHON_CONFIG_FOR_EXE := $(PYTHON_CONFIG) --embed
 endif
 
 PYTHON_DESTDIR := $(shell $(PYTHON_EXECUTABLE) -c "import site; print(site.getsitepackages()[-1]);")
@@ -346,8 +348,11 @@ ifeq ($(ENABLE_PYOSYS),1)
 # python-config --ldflags includes -l and -L, but LINKFLAGS is only -L
 LINKFLAGS += $(filter-out -l%,$(shell $(PYTHON_CONFIG) --ldflags))
 LIBS += $(shell $(PYTHON_CONFIG) --libs)
+EXE_LIBS += $(filter-out $(LIBS),$(shell $(PYTHON_CONFIG_FOR_EXE) --libs))
 CXXFLAGS += $(shell $(PYTHON_CONFIG) --includes) -DWITH_PYTHON
+ifeq ($(ENABLE_WHEEL),1)
 EXTRA_TARGETS += wheel
+endif
 
 # Detect name of boost_python library. Some distros use boost_python-py<version>, other boost_python<version>, some only use the major version number, some a concatenation of major and minor version numbers
 CHECK_BOOST_PYTHON = (echo "int main(int argc, char ** argv) {return 0;}" | $(CXX) -xc -o /dev/null $(LINKFLAGS) $(LIBS) -l$(1) - > /dev/null 2>&1 && echo "-l$(1)")
@@ -735,7 +740,7 @@ share: $(EXTRA_TARGETS)
 	@echo ""
 
 $(PROGRAM_PREFIX)yosys$(EXE): $(OBJS)
-	$(P) $(CXX) -o $(PROGRAM_PREFIX)yosys$(EXE) $(EXE_LINKFLAGS) $(LINKFLAGS) $(OBJS) $(LIBS) $(LIBS_VERIFIC)
+	$(P) $(CXX) -o $(PROGRAM_PREFIX)yosys$(EXE) $(EXE_LINKFLAGS) $(LINKFLAGS) $(OBJS) $(EXE_LIBS) $(LIBS) $(LIBS_VERIFIC)
 
 libyosys.so: $(filter-out kernel/driver.o,$(OBJS))
 ifeq ($(OS), Darwin)

setup.py

@@ -40,8 +40,8 @@ class libyosys_so_ext(Extension):
         )
         self.args = [
             "ENABLE_PYOSYS=1",
-            # Wheel meant to be imported from interpreter
-            "ENABLE_PYTHON_CONFIG_EMBED=0",
+            # Prevent recursive wheel build
+            "ENABLE_WHEEL=0",
             # Would need to be installed separately by the user
             "ENABLE_TCL=0",
             "ENABLE_READLINE=0",