subprojects: add the anyhow crate

This is a standard replacement for Box<dyn Error> which is more efficient (it only
occcupies one word) and provides a backtrace of the error.  This could be plumbed
into &error_abort in the future.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/meson.build

@@ -1,7 +1,9 @@
+subproject('anyhow-1-rs', required: true)
 subproject('bilge-0.2-rs', required: true)
 subproject('bilge-impl-0.2-rs', required: true)
 subproject('libc-0.2-rs', required: true)
 
+anyhow_rs = dependency('anyhow-1-rs')
 bilge_rs = dependency('bilge-0.2-rs')
 bilge_impl_rs = dependency('bilge-impl-0.2-rs')
 libc_rs = dependency('libc-0.2-rs')

rust/qemu-api/meson.build

@@ -35,7 +35,7 @@ _qemu_api_rs = static_library(
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   rust_args: _qemu_api_cfg,
-  dependencies: [libc_rs, qemu_api_macros, qemuutil_rs,
+  dependencies: [anyhow_rs, libc_rs, qemu_api_macros, qemuutil_rs,
                  qom, hwcore, chardev, migration],
 )
 

scripts/archive-source.sh

@@ -27,7 +27,7 @@ sub_file="${sub_tdir}/submodule.tar"
 # in their checkout, because the build environment is completely
 # different to the host OS.
 subprojects="keycodemapdb libvfio-user berkeley-softfloat-3
-  berkeley-testfloat-3 arbitrary-int-1-rs bilge-0.2-rs
+  berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs bilge-0.2-rs
   bilge-impl-0.2-rs either-1-rs itertools-0.11-rs libc-0.2-rs proc-macro2-1-rs
   proc-macro-error-1-rs proc-macro-error-attr-1-rs quote-1-rs
   syn-2-rs unicode-ident-1-rs"

scripts/make-release

@@ -40,7 +40,7 @@ fi
 
 # Only include wraps that are invoked with subproject()
 SUBPROJECTS="libvfio-user keycodemapdb berkeley-softfloat-3
-  berkeley-testfloat-3 arbitrary-int-1-rs bilge-0.2-rs
+  berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs bilge-0.2-rs
   bilge-impl-0.2-rs either-1-rs itertools-0.11-rs libc-0.2-rs proc-macro2-1-rs
   proc-macro-error-1-rs proc-macro-error-attr-1-rs quote-1-rs
   syn-2-rs unicode-ident-1-rs"

subprojects/.gitignore

@@ -6,6 +6,7 @@
 /keycodemapdb
 /libvfio-user
 /slirp
+/anyhow-1.0.98
 /arbitrary-int-1.2.7
 /bilge-0.2.0
 /bilge-impl-0.2.0

subprojects/anyhow-1-rs.wrap

@@ -0,0 +1,7 @@
+[wrap-file]
+directory = anyhow-1.0.98
+source_url = https://crates.io/api/v1/crates/anyhow/1.0.98/download
+source_filename = anyhow-1.0.98.tar.gz
+source_hash = e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487
+#method = cargo
+patch_directory = anyhow-1-rs

subprojects/packagefiles/anyhow-1-rs/meson.build

@@ -0,0 +1,33 @@
+project('anyhow-1-rs', 'rust',
+  meson_version: '>=1.5.0',
+  version: '1.0.98',
+  license: 'MIT OR Apache-2.0',
+  default_options: [])
+
+rustc = meson.get_compiler('rust')
+
+rust_args = ['--cap-lints', 'allow']
+rust_args += ['--cfg', 'feature="std"']
+if rustc.version().version_compare('<1.65.0')
+  error('rustc version ' + rustc.version() + ' is unsupported. Please upgrade to at least 1.65.0')
+endif
+rust_args += [ '--cfg', 'std_backtrace' ] # >= 1.65.0
+if rustc.version().version_compare('<1.81.0')
+  rust_args += [ '--cfg', 'anyhow_no_core_error' ]
+endif
+
+_anyhow_rs = static_library(
+  'anyhow',
+  files('src/lib.rs'),
+  gnu_symbol_visibility: 'hidden',
+  override_options: ['rust_std=2018', 'build.rust_std=2018'],
+  rust_abi: 'rust',
+  rust_args: rust_args,
+  dependencies: [],
+)
+
+anyhow_dep = declare_dependency(
+  link_with: _anyhow_rs,
+)
+
+meson.override_dependency('anyhow-1-rs', anyhow_dep)