meson/test cases/common/219 source set configuratio.../f.c

#include "all.h"

void (*p)(void) = (void *)0x12AB34CD;

void f(void)
{
}
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			`#include "all.h"`

tests: Prevent multiple-definition of symbols With GCC 10, -fno-common becomes default behavior, meaning that any subtly-broken code will be broken not so subtly anymore. This commit changes the linkage to variables declared in headers to external and, where needed, adds additional definitions in other compilation units. 5 years ago			`void (p)(void) = (void )0x12AB34CD;`

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			`void f(void)`
			`{`
			`}`