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#!/usr/bin/python3
import os
import pathlib
"""
This creates C++20 gcc compiled modules (CMI)
for some of the system include files used by Shasta.
This creates:
1. The C++ modules, in directory gcm.cache.
2. File modules.txt which contains a list and locations
of the compiled modules in gcm.cache.
To use these modules during a build:
1. Add "-fmodules-ts -fmodule-mapper=modules.txt" to the command line
2. C++ code should use "import <iostream>;" instead of "#include iostream>",
etc. for other modules.
"""
stdDirectory = 'usr/include/c++/11'
stdIncludes = [
'algorithm',
'array',
'chrono',
'cstddef',
'cstdint',
'fstream',
'iosfwd',
'iostream',
'iterator',
'map',
# 'memory', For some reason this errors out while building.
'numeric',
'set',
'span',
# 'stdexcept', For some reason this errors out while building.
# 'string', For some reason this errors out while building.
'tuple',
'utility',
'vector',
]
modulesFile = open('modules.txt', 'w')
modulesFile.write('$root ' + str(pathlib.Path().absolute()) + '/gcm.cache\n')
for stdInclude in stdIncludes:
command = 'g++ -std=c++20 -fmodules-ts -c -x c++-system-header ' + stdInclude
os.system(command)
modulesFile.write('/%s/%s %s/%s.gcm\n' % (stdDirectory, stdInclude, stdDirectory, stdInclude))
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