Remove Makefile variables that are cocotb-config calls

This should increase startup speed. Also the documentation for these
variables was removed.

cocotb_build_libs.py

@@ -487,7 +487,6 @@ def _get_common_lib_ext(include_dirs, share_lib_dir):
     Defines common libraries.
 
     All libraries go into the same directory to enable loading without modifying the library path (e.g. LD_LIBRARY_PATH).
-    In Makefile `LIB_DIR` (s) is used to point to this directory.
     """
 
     #

docs/source/building.rst

@@ -411,36 +411,3 @@ and
 
 ..
    `CXXFLAGS`, `LDLIBS` are not supported by distutils/pip
-
-
-Internal Variables
-------------------
-
-The following variables are used for cocotb internals.
-They may change at any time, and users should not rely on them.
-
-.. envvar:: COCOTB_PY_DIR
-
-    Path to the directory containing the cocotb Python package in the :file:`cocotb` subdirectory.
-
-.. envvar:: COCOTB_SHARE_DIR
-
-    Path to the directory containing the cocotb Makefiles and simulator libraries in the subdirectories
-    :file:`lib`, :file:`include`, and :file:`makefiles`.
-
-.. envvar:: COCOTB_LIBRARY_COVERAGE
-
-   Enable code coverage collection for cocotb internals.
-   When set, a file :file:`.coverage.cocotb` will be written which contains statistics about the code coverage.
-   This is mainly useful for cocotb's own Continuous Integration setup.
-
-..
-   TODO
-
-   Build Defines
-   -------------
-
-   SINGLETON_HANDLES
-   PYTHON_SO_LIB
-
-   simulator sim defines

src/cocotb_tools/makefiles/Makefile.inc

@@ -42,13 +42,6 @@ sim:
 # Make sure to use bash for the pipefail option used in many simulator Makefiles
 SHELL := bash
 
-# Directory containing the cocotb Python module
-COCOTB_PY_DIR := $(shell cocotb-config --prefix)
-
-# Directory containing all support files required to build cocotb-based
-# simulations: Makefile fragments, and the simulator libraries.
-COCOTB_SHARE_DIR := $(COCOTB_PY_DIR)/cocotb/share
-
 OS=$(shell uname)
 ifneq (, $(findstring MINGW, $(OS)))
     OS := Msys
@@ -66,8 +59,6 @@ PYTHON_BIN ?= $(shell cocotb-config --python-bin)
 
 include $(shell cocotb-config --makefiles)/Makefile.deprecations
 
-LIB_DIR=$(COCOTB_PY_DIR)/cocotb/libs
-
 PYTHON_ARCH := $(shell $(PYTHON_BIN) -c 'from platform import architecture; print(architecture()[0])')
 ifeq ($(filter $(PYTHON_ARCH),64bit 32bit),)
     $(error Unknown Python architecture: $(PYTHON_ARCH))

src/cocotb_tools/makefiles/simulators/Makefile.verilator

@@ -59,8 +59,10 @@ ifdef VERILOG_INCLUDE_DIRS
   COMPILE_ARGS += $(addprefix +incdir+, $(VERILOG_INCLUDE_DIRS))
 endif
 
-$(SIM_BUILD)/Vtop.mk: $(VERILOG_SOURCES) $(CUSTOM_COMPILE_DEPS) $(COCOTB_SHARE_DIR)/lib/verilator/verilator.cpp | $(SIM_BUILD)
-	$(CMD) -cc --exe -Mdir $(SIM_BUILD) -DCOCOTB_SIM=1 $(TOPMODULE_ARG) $(COMPILE_ARGS) $(EXTRA_ARGS) $(VERILOG_SOURCES) $(COCOTB_SHARE_DIR)/lib/verilator/verilator.cpp
+VERILATOR_CPP := $(shell cocotb-config --share)/lib/verilator/verilator.cpp
+
+$(SIM_BUILD)/Vtop.mk: $(VERILOG_SOURCES) $(CUSTOM_COMPILE_DEPS) $(VERILATOR_CPP) | $(SIM_BUILD)
+	$(CMD) -cc --exe -Mdir $(SIM_BUILD) -DCOCOTB_SIM=1 $(TOPMODULE_ARG) $(COMPILE_ARGS) $(EXTRA_ARGS) $(VERILOG_SOURCES) $(VERILATOR_CPP)
 
 # Compilation phase
 $(SIM_BUILD)/Vtop: $(SIM_BUILD)/Vtop.mk