[WIP] Python bindings proof of concept #241
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This commit makes `skc` invokations cleaner by passing relative paths to sources files.
This has not been an issue so far because the `build/` directory would be explicitly created when building the `build.sk` for `std`, which so far has always been the first thing to be built during a `skargo build` run.
This package is intended to be used in custom build scripts in order to link against system libraries.
This package is meant to be used in custom build scripts in order to build simple C/C++ extensions.
Some places used `ginfo->fileName == NULL` to check whether persistent allocation was enabled, while other places checked `gmutex == NULL`. This commit makes all checks `ginfo->fileName == NULL`.
Also define `SKIP_LIBRARY`/`SKIP_BINARY` when compiling `runtime64_specific.cpp`.
Example usage: - Define an exported function within skdb, for instance: ``` // src/skdb_main.sk @export("skdb_main") untracked fun skdb_main(): void { SKDB.main() } ``` Note: while it may be tempting to just `@export("skdb_main")` the actual `SKDB.main()`, this would clash with the compiler exporting it as `skip_main` so that the runtime picks it up. - Call it from C: ``` // foo.c // Forward-declare the exported function. void skdb_main(); int main() { // Just call it. The shared library constructor will initialize the runtime. skdb_main(); return 0; } ``` - Build and run: ``` $ skargo build $ clang -lskdb -Ltarget/host/dev foo.c -o foo $ LD_LIBRARY_PATH=target/host/dev ./foo ```
The `end` global variable is a non-standard symbol whose address is the first valid address beyond the bss segment. Having it non-static in `obstack.c` causes issues when loading `libskdb.so`.
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Build:
```
$ (cd sql && skargo build -r --lib)
$ cd pyskdb && pip install .
```
Run:
```
$ python -c "import skdb; skdb.exec('CREATE TABLE foo(a INTEGER, b \
TEXT, c FLOAT); INSERT INTO foo VALUES (1337, \'hello\', \
3.14159267), (42, \'foo\', 2e64)'); print(skdb.exec('SELECT * FROM \
foo'))"
[{'a': 42, 'b': 'foo', 'c': 2e+64}, {'a': 1337, 'b': 'hello', 'c': 3.14159267}]
```
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