Revise the manual procedure in the `*Lexer.in.l` files. Some of our
post-processing steps are no longer necessary with the current set of
supported compilers. Some steps changed with newer versions of flex.
Then regenerate all lexers with flex version 2.6.1.
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool. Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience. Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.
Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices. It also references version control
history for more precise information. Therefore we no longer need to spell
out the list of Contributors in each source file notice.
Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing". The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.
Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically. Manually fix up shebang lines and trailing
newlines in a few files. Manually update the notices in a few files that the
script does not handle.
Fortran 2008 [1] adds support for a new syntax related to modules:
submodule ( ParentModule ) SubModule
submodule ( ParentModule : SubModule ) NestedSubModule
Both of these mean that the current source file requires the module
`ParentModule` to be available if it is not provided in the current
file. Teach our Fortran dependency scanner to parse this syntax to
extract this relationship. For now simply tolerate the nested submodule
case and extract only the dependency it expresses on the main module.
Further work will be needed to extract dependencies among nested
submodules.
[1] http://fortranwiki.org/fortran/show/Fortran+2008Closes: #16234
Teach the lexer to match and return specific Fortran keywords as tokens.
Update the parser to use these instead of always using a WORD token and
then checking the text. This avoids extra string comparisons and will
allow more grammar productions to be unambiguously added later for
additional Fortran statements.
Revise the documented modifications we need to make to the
flex-generated source file according to the needs of the new version.
Also drop the duplicate copyright notice block from the generated file.
Teach the lexer to extract the #line directive prefix and line number as
a new token type. Teach the parser to recognize this token followed by
a string as the file name (plus possibly other content). Report the
named file as included by the source file.
The parser can be re-used outside cmDependsFortran or the cmDepends
class hierarchy so drop the "Depends" from its name:
rename 's/DependsFortran([A-Za-z0-9_])/Fortran$1/' Source/*.*
sed -i 's/DependsFortran\([A-Za-z0-9_]\)/Fortran\1/g' Source/*.*
sed -i 's/FortranInternals/DependsFortranInternals/g' Source/*.*
Also manually fix Source/CMakeLists.txt source file ordering.
