Keep docs version in conf.py

Makefile

@@ -1012,7 +1012,7 @@ docs/reqs:
 
 DOC_TARGET ?= html
 docs: docs/source/cmd/abc.rst docs/gen_examples docs/gen_images docs/guidelines docs/usage docs/reqs
-	$(Q) YOSYS_VER=$(YOSYS_VER) $(MAKE) -C docs $(DOC_TARGET)
+	$(Q) $(MAKE) -C docs $(DOC_TARGET)
 
 clean:
 	rm -rf share

docs/source/conf.py

@@ -4,7 +4,8 @@
 
 project = 'YosysHQ Yosys'
 author = 'YosysHQ GmbH'
-copyright ='2022 YosysHQ GmbH'
+copyright ='2024 YosysHQ GmbH'
+yosys_ver = "0.40"
 
 # select HTML theme
 html_theme = 'furo'
@@ -46,12 +47,18 @@
 autosectionlabel_prefix_document = True
 autosectionlabel_maxdepth = 1
 
+# set version
+if os.getenv("READTHEDOCS") and os.getenv("READTHEDOCS_VERSION") == "latest":
+    release = yosys_ver + "-dev"
+else:
+    release = yosys_ver
+
 # assign figure numbers
 numfig = True
 
 bibtex_bibfiles = ['literature.bib']
-
 latex_elements = {
+        'releasename': ' ',
         'preamble': r'''
 \usepackage{lmodern}
 \usepackage{comment}
@@ -63,14 +70,6 @@
 extensions.append('sphinx.ext.todo')
 todo_include_todos = False
 
-# attempt to get version
-env_yosys_ver = os.getenv("YOSYS_VER")
-if env_yosys_ver:
-    if os.getenv("READTHEDOCS") and os.getenv("READTHEDOCS_VERSION") == "latest":
-        release = env_yosys_ver + "-dev"
-    else:
-        release = env_yosys_ver
-
 # custom cmd-ref parsing/linking
 sys.path += [os.path.dirname(__file__) + "/../"]
 extensions.append('util.cmdref')