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authorBoris Kolpackov <boris@codesynthesis.com>2019-11-16 13:01:15 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2019-11-16 13:01:15 +0200
commit74bedb486d5226609516492e5cedeffc382841ac (patch)
tree8cf294b250d1c3c75bdcdc3bbb528b5aef1810e7 /NEWS
parent460eb164f0051cf0ffab6860220649c4f03c74fb (diff)
Update NEWS file
Diffstat (limited to 'NEWS')
-rw-r--r--NEWS237
1 files changed, 228 insertions, 9 deletions
diff --git a/NEWS b/NEWS
index 1a2f5a7..0840677 100644
--- a/NEWS
+++ b/NEWS
@@ -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.