meson

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Author	SHA1	Message	Date
Marc-André Lureau	8ba1405742	sourceset: add all_dependencies() method 'if_true' sources should be built with their dependencies, as illustrated by test case change. Ideally, I think we would want only the files with the dependencies to be built with the flags, but that would probably change the way sourceset are used.	6 years ago
Paolo Bonzini	d894c48660	new module "sourceset" to match source file lists against configuration data In QEMU a single set of source files is built against many different configurations in order to generate many executable. Each executable includes a different but overlapping subset of the source files; some of the files are compiled separately for each output, others are compiled just once. Using Makefiles, this is achieved with a complicated mechanism involving a combination of non-recursive and recursive make; Meson can do better, but because there are hundreds of such conditional rules, it's important to keep meson.build files brief and easy to follow. Therefore, this commit adds a new module to satisfy this use case while preserving Meson's declarative nature. Configurations are mapped to a configuration_data object, and a new "source set" object is used to store all the rules, and then retrieve the desired set of sources together with their dependencies. The test case shows how extract_objects can be used to satisfy both cases, i.e. when the object files are shared across targets and when they have to be separate. In the real-world case, a project would use two source set objects for the two cases and then do "executable(..., sources: ... , objects: ...)". The next commit adds such an example.	6 years ago

Author

SHA1

Message

Date

Marc-André Lureau

8ba1405742

sourceset: add all_dependencies() method

'if_true' sources should be built with their dependencies, as
illustrated by test case change.

Ideally, I think we would want only the files with the dependencies to
be built with the flags, but that would probably change the way
sourceset are used.

6 years ago

Paolo Bonzini

d894c48660

new module "sourceset" to match source file lists against configuration data

In QEMU a single set of source files is built against many different
configurations in order to generate many executable.  Each executable
includes a different but overlapping subset of the source files; some
of the files are compiled separately for each output, others are
compiled just once.

Using Makefiles, this is achieved with a complicated mechanism involving
a combination of non-recursive and recursive make; Meson can do better,
but because there are hundreds of such conditional rules, it's important
to keep meson.build files brief and easy to follow.  Therefore, this
commit adds a new module to satisfy this use case while preserving
Meson's declarative nature.

Configurations are mapped to a configuration_data object, and a new
"source set" object is used to store all the rules, and then retrieve
the desired set of sources together with their dependencies.

The test case shows how extract_objects can be used to satisfy both
cases, i.e. when the object files are shared across targets and when
they have to be separate.  In the real-world case, a project would use
two source set objects for the two cases and then do
"executable(..., sources: ... , objects: ...)".  The next commit
adds such an example.

6 years ago

2 Commits (1dee6c618d879c20bf0a70eebc54bc8caf47716f)