rscons/CHANGELOG.md

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## ChangeLog
### v1.14.0
#### New Features
- #45 - Add Rscons::VarSet#values_at
#### Fixes
- #44 - Environment#print_builder_run_message should support string commands
### v1.13.0
#### New Features
- #43 - Add ability to record side-effect file production
### v1.12.0
#### New Features
- #40 - env.depends should imply env.build_after
- #41 - be more colorful
#### Fixes
- #39 - wait for in-progress subcommands to complete on build failure
- #42 - cloned Environments should inherit n_threads
### v1.11.1
#### Fixes
- fix the circular build dependency detection logic
### v1.11.0
#### New Features
- Change default Environment :clone option to :all to clone all attributes
- #38 - raise error when circular dependencies are found
- #34 - Allow overriding n_threads on a per-Environment level
#### Fixes
- #35 - env.build_after should expand paths
- #36 - SHCFLAGS and SHCXXFLAGS should inherit non-SH flags by default
- #37 - Fix non-blocking thread-wait if Rscons.n_threads is set to 0
### v1.10.0
#### New Features
- #23 - add parallelization - builds are now parallelized by default
- #31 - add LEXSUFFIX, YACCSUFFIX construction variables
- #30 - place object files for absolute source paths under build_root
- #28 - support redirecting standard output using the Command builder
- Always use a build root and default it to "build"
- Add builder features
- #8 - add SharedObject and SharedLibrary builders
#### Fixes
- expand target and source paths before calling Builder#create_build_target
- #29 - fix PROGSUFFIX handling
- #32 - Pre-build hooks do not respect modified key values
### v1.9.3
- Environment#parse_flags should put -std=XXX flags in CCFLAGS, not CFLAGS
### v1.9.2
- allow phony targets in conjunction with build roots
### v1.9.1
- change *SUFFIX defaults to arrays
- add various C++ file suffixes
- use ${INCPREFIX} instead of hard-coded "-I" in Preprocess builder
### v1.9.0
#### New Features
- #6 - add Install and Copy builders
- #22 - allow overriding Command builder short description with CMD_DESC variable
- #24 - add "rscons" executable
- #25 - add support for phony targets given as Symbols instead of Strings
- #26 - support registering multiple build targets with the same target name
- #27 - add Directory builder
#### Fixes
- #20 - fix variable references that expand to arrays in build target sources
- #21 - rework Preprocess builder to consider deep dependencies
- fix Rscons.set_suffix to append the given suffix if the filename has none
- remove ${CFLAGS} from default CPP_CMD
### v1.8.1
- fix Environment#dump when construction variables are symbols
### v1.8.0
- new Command builder to execute arbitrary user commands
- new SimpleBuilder class
- create new builders quickly by passing a block to Environment#add_builder
- improved YARD documentation
- add Environment#dump to debug Environment construction variables
### v1.7.0
- allow build hooks to register new build targets
- add post-build hooks (register with Environment#add_post_build_hook)
- clear all build targets after processing an Environment
- allow trailing slashes in arguments to Environment#build_dir
### v1.6.1
- add DEPFILESUFFIX construction variable to override dependency file suffix
- fix Environment#depends to expand its arguments for construction variables
### v1.6.0
- support lambdas as construction variable values
### v1.5.0
- add "json" as a runtime dependency
- update construction variables to match SCons more closely
- add CPPDEFPREFIX, INCPREFIX, CPPDEFINES, CCFLAGS, LIBDIRPREFIX, and LIBLINKPREFIX
- add Environment#shell
- add Environment#parse_flags, #parse_flags!, #merge_flags
- unbuffer $stdout by default
- add PROGSUFFIX construction variable (defaults to .exe on MinGW/Cygwin)
- add Rscons::BuildTarget and Builder#create_build_target
- update specs to RSpec 3.x and fix to run on MinGW/Cygwin/Linux
- add YARD documentation to get to 100% coverage
### v1.4.3
- fix builders properly using construction variable overrides
- expand nil construction variables to empty strings
### v1.4.2
- add Environment#expand_path
- expand construction variable references in builder targets and sources before invoking builder
### v1.4.1
- fix invoking a builder with no sources while a build root defined
### v1.4.0
- add CFile builder
- add Disassemble builder
- add Preprocess builder
- pass the Environment object to build hooks in the :env key of the build_op parameter
- expand target/source paths beginning with "^/" to be relative to the Environment's build root
- many performance improvements, including:
- use JSON instead of YAML for the cache to improve loading speed (Issue #7)
- store a hash of the build command instead of the full command contents in the cache
- implement copy-on-write semantics for construction variables when cloning Environments
- only load the cache once instead of on each Environment#process
- only write the cache when something has changed
- fix Cache#mkdir_p to handle relative paths (Issue #5)
- flush the cache to disk if a builder raises an exception (Issue #4)
### v1.3.0
- change Environment#execute() options parameter to accept the following options keys:
- :env to pass an environment Hash to Kernel#system
- :options to pass an options Hash to Kernel#system
### v1.2.0
- add :clone option to Environment#clone to control exactly which Environment attributes are cloned
- allow nil to be passed in to Environment#build_root=
### v1.1.0
- Change Cache#up_to_date?() and #register_build() to accept a single target
file or an array of target file names