diff options
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 237 |
1 files changed, 228 insertions, 9 deletions
@@ -1,29 +1,248 @@ Version 0.12.0 - * The build system has been split into a library (libbuild2) and a driver. + * Support for dynamically-buildable/loadable build system modules. + + See the libbuild2-hello sample module to get started: + + https://github.com/build2/libbuild2-hello + + * Support for pattern matching (switch). + + For example: + + switch $cxx.target.class, $cxx.target.system + { + case 'windows', 'mingw32' + cxx.libs += -lrpcrt4 + + case 'windows' + cxx.libs += rpcrt4.lib + + case 'macos' + cxx.libs += -framework CoreFoundation + } + + See the "Pattern Matching (switch)" section in the manual for details. + + * Support for default options files (aka tool config files). + + See the DEFAULT OPTIONS FILES section in b(1) for details. + + * Support for Clang targeting MSVC runtime on Windows. + + In particular, the build2 toolchain itself can now be build with Clang on + Windows, including using LLD. See the "Clang Compiler Toolchain" section + in the manual for details. + + * Support for automatic installation discovery for MSVC 15 (2017) and later. + + In particular, this allows building outside the Visual Studio development + command prompts. See the "MSVC Compiler Toolchain" section in the manual + for details. + + * Ability to specify "compiler mode" options as part of config.{c,cxx}. + + Such options are not overridden in buildfiles and are passed last (after + cc.coptions and {c,cxx}.coptions) in the resulting command lines. Note + that they are also cross-hinted between config.c and config.cxx. For + example: + + $ b config.cxx="g++-9 -m32" # implies config.c="gcc-9 -m32" + + But: + + $ b config.cxx="clang++ -stdlib=libc++" config.c=clang + + * Support for [config.]{cc,c,cxx}.aoptions (archive options). + + In particular, this can be used to suppress lib.exe warnings, for example: + + cc.aoptions += /IGNORE:4221 + + * The cxx.std=latest value has been remapped from c++latest to c++17 for + MSVC 16 (2019). + + See issue #34 for background: + + https://github.com/build2/build2/issues/34 + + * Support for bracket expressions ([...]) in wildcard patterns. + + See the "Name Patterns" section in the manual for details. + + * Support for native shared library versioning on Linux. + + Now we can do: + + lib{foo}: bin.lib.version = linux@1.2 + + And end up with: + + libfoo.so.1.2 + libfoo.so.1 -> libfoo.so.1.2 + + See issue #49 for background and details: + + https://github.com/build2/build2/issues/49 + + * Changes to the Buildfile language functions: + + - $string.icasecmp(): new + + - $regex.replace_lines(): new + + - $regex.{match,search}(): now return NULL on no match with return_* flags + + - $filesystem.path_match(): renamed to $path.match() + + - $quote(): new + + This function can be useful if we want to pass a value on the command + line, for example, in a testscript: + + $* config.cxx=$quote($recall($cxx.path) $cxx.mode, true) + + - $config.save(): new + + This is similar to the config.config.save variable functionality (see + below) except that it can be called from within buildfiles and with the + result saved in a variable, printed, etc. + + Note that this function can only be used during configure unless the + config module creation was forced for other meta-operations with + config.config.module=true in bootstrap.build. + + * Support for configuration exporting and importing. + + The new config.config.save variable specifies the alternative file to + write the configuration to as part of the configure meta-operation. For + example: + + $ b configure: proj/ config.config.save=proj-config.build + + The config.config.save value "applies" only to the projects on whose root + scope it is specified or if it is a global override (the latter is a bit + iffy but we allow it, for example, to dump everything to stdout). This + means that in order to save a subproject's configuration we will have to + use a scope-specific override (since the default will apply to the + outermost amalgamation). For example: + + $ b configure: subproj/ subproj/config.config.save=.../subproj-config.build + + This is somewhat counter-intuitive but then it will be the amalgamation + whose configuration we would normally want to export. + + The new config.config.load variable specifies additional configuration + files to be loaded after the project's default config.build, if any. For + example: + + $ b create: cfg/,cc config.config.load=.../my-config.build + + Similar to config.config.save, the config.config.load value "applies" only + to the project on whose root scope it is specified or if it is a global + override. This allows the use of the standard override "positioning" + machinery (i.e., where the override applies) to decide where the extra + configuration files are loaded. The resulting semantics is quite natural + and consistent with command line variable overrides, for example: + + $ b config.config.load=.../config.build # outermost amalgamation + $ b ./config.config.load=.../config.build # this project + $ b !config.config.load=.../config.build # every project + + Both config.config.load and config.config.save recognize the special `-` + file name as an instruction to read/write from/to stdin/stdout, + respectively. For example: + + $ b configure: src-prj/ config.config.save=- | \ + b configure: dst-prj/ config.config.load=- + + The config.config.load also recognizes the `~host` special configuration + name. This is the "default host configuration" that corresponds to how the + build system itself was built. For example: + + $ b create: tools/,cc config.config.load=~host + + * Attributes are now comma-separated with support for arbitrary values. + + Before: + + x = [string null] + + After: + + x = [string, null] + + * The build system has been split into a library (libbuild2) a set of + modules, and a driver. + + See the following mailing list post for details: + + https://lists.build2.org/archives/users/2019-October/000687.html As part of this change the following configuration macros (normally - supplied via the -D preprocessor options) have been renamed from their - old BUILD2_* versions to: + supplied via the -D preprocessor options) have been renamed from their old + BUILD2_* versions to: LIBBUILD2_MTIME_CHECK LIBBUILD2_SANE_STACK_SIZE LIBBUILD2_DEFAULT_STACK_SIZE LIBBUILD2_ATOMIC_NON_LOCK_FREE + * A notion of build context. + + All the non-const global state has been moved to class context and we can + now have multiple independent builds at the same time. In particular, this + functionality is used to update build system modules as part of another + build. + + * New --silent options. + + Now in certain contexts (for example, while updating build system modules) + the --quiet|-q verbosity level is ignored. We can specify --silent instead + to run quietly in all contexts. + + * Support for the for_install prerequisite-specific variable. + + Setting this variable to true or false controls whether a prerequisite + will be used by the link rule depending on whether the update is for + install or not. Also reserve for_test for future use. + + * New config.config.persist variable. + + This variable is part of initial support for customizable config.* + variable persistence. + + * New bin.lib.load_suffix variable. + + Setting this variable triggers the creation of yet another symlink to the + shared library that is meant to be used for dynamic loading. For example, + we may want to embed the main program interface number into its plugins to + make sure that we only load compatible versions. + + * New bin.lib.{version_pattern,load_suffix_pattern} variables. + + These variables allow specifying custom version and load suffix patterns + that are used to automatically cleanup files corresponding to previous + versions. + + * Rename the config.cxx.importable_headers variable to + config.cxx.translatable_headers. + + The new name aligns better with the post-Cologne importable/translatable + semantics. * The libu{} target group has been removed. - The semantics provided by libu{} is rarely required and as result was not - yet documented. However, if you are using it, the new way to achieve the - same result is to use both libue{} and libul{} explicitly, for example: + The semantics provided by libu{} is rarely required and as a result was + not yet documented. However, if you are using it, the new way to achieve + the same result is to use both libue{} and libul{} explicitly, for + example: exe{foo}: libue{foo} lib{foo}: libul{foo} {libue libul}{foo}: cxx{*} - Version 0.11.0 * Initial work on header unit importation and include translation support. @@ -136,8 +355,8 @@ Version 0.10.0 Now the build/*.build, buildfile, and .buildignore filesystem entries in a project can alternatively (but consistently) be called build2/*.build2, - build2file, and .build2ignore. See a note at the beginning of the Project - Structure section in the manual for details (motivation, restrictions, + build2file, and .build2ignore. See a note at the beginning of the "Project + Structure" section in the manual for details (motivation, restrictions, etc). * Support for multiple variable overrides. |