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100 lines
3.9 KiB
Python
100 lines
3.9 KiB
Python
# Copyright 2021 MongoDB Inc.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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import SCons
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def _add_scanner(builder):
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# We are taking over the target scanner here. If we want to not do
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# that we need to invent a ListScanner concept to inject. What if
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# the other scanner wants a different path_function?
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assert builder.target_scanner is None
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def new_scanner(node, env, path, argument):
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# Use the path information that FindPathDirs gave us to resolve
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# the forced includes into nodes given the search path.
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fis = [env.FindFile(f, path) for f in env.get("FORCEINCLUDES", [])]
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# If all nodes could not be resolved, there are missing headers.
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if not all(fis):
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missing_headers = [
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header for node, header in zip(fis, env.get("FORCEINCLUDES")) if not node
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]
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errstring = f"Could not find force include header(s): {missing_headers} in any path in CPPPATH:\n"
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for cpppath in env.get("CPPPATH", []):
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errstring += f"\t{env.Dir(cpppath).path}\n"
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raise SCons.Errors.SConsEnvironmentError(errstring)
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# Use the nodes *source* scanner, which was provided to us as
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# `argument` when we created this scanner, to scan the forced
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# includes for transitive includes.
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node.get_executor().scan(scanner=argument, node_list=fis)
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# The forced includes will be added as implicit dependencies
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# for us when we return them.
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return fis
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# The 'builder.builder' here is because we need to reach inside
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# the CompositeBuilder that wraps the object builders that come
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# back from createObjBuilders.
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builder.builder.target_scanner = SCons.Scanner.Scanner(
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function=new_scanner,
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path_function=SCons.Script.FindPathDirs("CPPPATH"),
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argument=builder.source_scanner,
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)
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def generate(env, **kwargs):
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if "FORCEINCLUDEPREFIX" not in env:
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if "msvc" in env.get("TOOLS", []):
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env["FORCEINCLUDEPREFIX"] = "/FI"
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else:
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env["FORCEINCLUDEPREFIX"] = "-include "
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if "FORCEINCLUDESUFFIX" not in env:
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env["FORCEINCLUDESUFFIX"] = ""
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# Expand FORCEINCLUDES with the indicated prefixes and suffixes.
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env["_FORCEINCLUDES"] = (
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"${_concat(FORCEINCLUDEPREFIX, FORCEINCLUDES, FORCEINCLUDESUFFIX, __env__, lambda x: x, TARGET, SOURCE)}"
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)
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env.Append(
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# It might be better if this went in _CPPINCFLAGS, but it
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# breaks the MSVC RC builder because the `rc` tool doesn't
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# honor /FI. It should be OK to put it in CCFLAGS, unless
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# there is a compiler that requires that an forced include
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# only come after the include file search path arguments that
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# would enable discovery.
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CCFLAGS=[
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"$_FORCEINCLUDES",
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]
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)
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for object_builder in SCons.Tool.createObjBuilders(env):
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_add_scanner(object_builder)
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def exists(env):
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return True
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