108 lines
4 KiB
Text
108 lines
4 KiB
Text
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This is the flow of the compiler detection logic:
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External to MSCommon:
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The Tool init modules, in their exists() routines, call -> msvc_exists(env)
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At the moment, those modules are:
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SCons/Tool/midl.py
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SCons/Tool/mslib.py
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SCons/Tool/mslink.py
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SCons/Tool/msvc.py
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SCons/Tool/msvs.py
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env may contain a version request in MSVC_VERSION, but this is not used
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in the detection that follows from msvc_exists(), only in the later
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batch that starts with a call to msvc_setup_env().
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Internal to MSCommon/vc.py:
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+ MSCommon/vc.py:msvc_exists:
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| vcs = cached_get_installed_vcs(env)
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| returns True if vcs > 0
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+-> MSCommon/vc.py:cached_get_installed_vcs:
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| checks global if we've run previously, if so return it
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| populate the global from -> get_installed_vcs(env)
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+-> MSCommon/vc.py:get_installed_vcs:
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| loop through "known" versions of msvc, granularity is maj.min
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| check for product dir -> find_vc_pdir(env, ver)
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+-> MSCommon/vc.py:find_vc_pdir:
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| From the msvc-version to pdir mapping dict, get reg key base and value
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| If value is none -> find_vc_pdir_vswhere(ver, env)
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+-> MSCommon/vc.py:find_vc_pdir_vswhere:
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| From the vc-version to VS-version mapping table get string
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| Figure out where vswhere is -> msvc_find_vswhere()
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| Use subprocess to call vswhere, return first line of match
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/
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| else get product directory from registry (<= 14.0)
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/
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| if we found one -> _check_cl_exists_in_vc_dir(env, pdir, ver)
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+-> MSCommon/vc.py:_check_cl_exists_in_vc_dir:
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| Figure out host/target pair
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| if version > 14.0 get specific version by looking in
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| pdir + Auxiliary/Build/Microsoft/VCToolsVersion/default.txt
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| look for pdir + Tools/MSVC/{specver}/bin/host/target/cl.exe
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| if 14.0 or less, "do older stuff"
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All of this just got us a yes-no answer on whether /some/ msvc version
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exists, but does populate __INSTALLED_VCS_RUN with all of the top-level
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versions as noted for get_installed_vcs
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Externally:
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Once a module's exists() has been called (or, in the case of
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clang/clangxx, after the compiler has been detected by other means -
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those still expect the rest of the msvc chain but not cl.exe)
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the module's generate() function calls -> msvc_setup_env_once(env)
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Internally:
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+ MSCommon/vc.py:msvc_setup_env_once:
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| checks for environment flag MSVC_SETUP_RUN
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| if not, -> msvc_setup_env(env) and set flag
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+-+ MSCommon/vc.py:msvc_setup_env:
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| set ver from -> get_default_version(env)
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+-+ MSCommon/vc.py:get_default_version:
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| if no version specified in env.MSVC_VERSION:
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| return first entry from -> cached_get_installed_vcs(env)
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| else return requested version
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/
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| get script from MSVC_USE_SCRIPT if set to a filename
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| -> script_env(script)
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+-+ MSCommon/vc.py:script_env:
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| return (possibly cached) script variables matching script arg
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/
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| else -> msvc_find_valid_batch_script(env, version)
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+-+ MSCommon/vc.py:msvc_find_valid_batch_script:
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| Build a list of plausible target values, and loop through
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| look for host + target -> find_batch_file(env, ver, host, target)
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+-+ MSCommon/vc.py:find_batch_file:
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| call -> find_vc_pdir (see above)
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| use the return to construct a version-biased batfile path, check
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/
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| if not found, try sdk scripts (unknown if this is still useful)
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Problems:
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- For VS >= 2017, VS and VS are not 1:1, there can be many VC for one VS
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- For vswhere-ready versions, detection does not proceed beyond the
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product level ("2019") into individual "features" (individual msvc)
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- As documented for MSVC_VERSION, compilers can only be requested if versions
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are from the set in _VCVER, so 14.1 but not 14.16 or 14.16.27023
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- Information found in the first pass (msvs_exists) isn't really
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available anywhere except the cached version list, since we just
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return true/false.
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- Since msvc_exists chain of calls does not look at version, we
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can proceed to compiler setup if *any* msvc was found, even if the
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one requested wasn't found.
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