* Eliminate all uses of `std.debug.print` in make() functions, instead
properly using the step failure reporting mechanism.
* Introduce the concept of skipped build steps. These do not cause the
build to fail, and they do allow their dependants to run.
* RunStep gains a new flag, `skip_foreign_checks` which causes the
RunStep to be skipped if stdio mode is `check` and the binary cannot
be executed due to it being a foreign executable.
- RunStep is improved to automatically use known interpreters to
execute binaries if possible (integrating with flags such as
-fqemu and -fwasmtime). It only does this after attempting a native
execution and receiving a "exec file format" error.
- Update RunStep to use an ArrayList for the checks rather than this
ad-hoc reallocation/copying mechanism.
- `expectStdOutEqual` now also implicitly adds an exit_code==0 check
if there is not already an expected termination. This matches
previously expected behavior from older API and can be overridden by
directly setting the checks array.
* Add `dest_sub_path` to `InstallArtifactStep` which allows choosing an
arbitrary subdirectory relative to the prefix, as well as overriding
the basename.
- Delete the custom InstallWithRename step that I found deep in the
test/ directory.
* WriteFileStep will now update its step display name after the first
file is added.
* Add missing stdout checks to various standalone test case build
scripts.
Rework std.Build.Step to have an `owner: *Build` field. This
simplified the implementation of installation steps, as well as provided
some much-needed common API for the new parallelized build system.
--verbose is now defined very concretely: it prints to stderr just
before spawning a child process.
Child process execution is updated to conform to the new
parallel-friendly make() function semantics.
DRY up the failWithCacheError handling code. It now integrates properly
with the step graph instead of incorrectly dumping to stderr and calling
process exit.
In the main CLI, fix `zig fmt` crash when there are no errors and stdin
is used.
Deleted steps:
* EmulatableRunStep - this entire thing can be removed in favor of a
flag added to std.Build.RunStep called `skip_foreign_checks`.
* LogStep - this doesn't really fit with a multi-threaded build runner
and is effectively superseded by the new build summary output.
build runner:
* add -fsummary and -fno-summary to override the default behavior,
which is to print a summary if any of the build steps fail.
* print the dep prefix when emitting error messages for steps.
std.Build.FmtStep:
* This step now supports exclude paths as well as a check flag.
* The check flag decides between two modes, modify mode, and check
mode. These can be used to update source files in place, or to fail
the build, respectively.
Zig's own build.zig:
* The `test-fmt` step will do all the `zig fmt` checking that we expect
to be done. Since the `test` step depends on this one, we can simply
remove the explicit call to `zig fmt` in the CI.
* The new `fmt` step will actually perform `zig fmt` and update source
files in place.
std.Build.RunStep:
* expose max_stdio_size is a field (previously an unchangeable
hard-coded value).
* rework the API. Instead of configuring each stream independently,
there is a `stdio` field where you can choose between
`infer_from_args`, `inherit`, or `check`. These determine whether the
RunStep is considered to have side-effects or not. The previous
field, `condition` is gone.
* when stdio mode is set to `check` there is a slice of any number of
checks to make, which include things like exit code, stderr matching,
or stdout matching.
* remove the ill-defined `print` field.
* when adding an output arg, it takes the opportunity to give itself a
better name.
* The flag `skip_foreign_checks` is added. If this is true, a RunStep
which is configured to check the output of the executed binary will
not fail the build if the binary cannot be executed due to being for
a foreign binary to the host system which is running the build graph.
Command-line arguments such as -fqemu and -fwasmtime may affect
whether a binary is detected as foreign, as well as system
configuration such as Rosetta (macOS) and binfmt_misc (Linux).
- This makes EmulatableRunStep no longer needed.
* Fix the child process handling to properly integrate with the new
bulid API and to avoid deadlocks in stdout/stderr streams by polling
if necessary.
std.Build.RemoveDirStep now uses the open build_root directory handle
instead of an absolute path.
* Step.init() now takes an options struct
* Step.init() now captures a small stack trace and stores it in the
Step so that it can be accessed when printing user-friendly debugging
information, including the lines of code that created the step in
question.
* Use std.Build.Cache.Directory instead of a string for storing the
cache roots and build roots.
* Set up a std.Build.Cache in build_runner.zig and use it in
std.Build.RunStep for avoiding redundant work.
Breaking API change to std.Build.addConfigHeader. It now uses an options
struct.
Introduce std.Build.CompileStep.installConfigHeader which also accepts
an options struct. This is used to add a generated config file into the
set of installed header files for a particular compilation artifact.
std.Build.ConfigHeaderStep now additionally supports a "blank" style
where a header is generated from scratch. It no longer exposes
`output_dir`. Instead it exposes a FileSource via `output_file`.
It now additionally accepts an `include_path` option which affects the
include path of CompileStep when using the `#include` directive, as well
as affecting the default installation subdirectory for header
installation purposes.
The hash used for the directory to store the generated config file now
includes the contents of the generated file. This fixes possible race
conditions when generating multiple header files simultaneously.
The values hash table is now an array hash map, to preserve order for
the "blank" use case.
I also took the opportunity to remove output_dir from TranslateCStep and
WriteFileStep. This is technically a breaking change, but it was always
naughty to access these fields.
Add ability to generate a c header file from scratch, and then both
compile with it and install it if needed.
Example:
```zig
const avconfig_h = b.addConfigHeader(.{ .path = "libavutil/avconfig.h" }, .generated, .{
.AV_HAVE_BIGENDIAN = 0, // TODO: detect based on target
.AV_HAVE_FAST_UNALIGNED = 1, // TODO: detect based on target
});
lib.addConfigHeader(avconfig_h);
lib.installConfigHeader(avconfig_h);
```
