refactor(tests): 一个条件写一次 —— cfg(linux)+cfg(macos) 合成 cfg(unix)

两个 grpc 成员各有一对逐字相同的 [target.'cfg(linux)'] 与
[target.'cfg(macos)'] 段。它们表达的是**一个**事实——compat.openssl
没有 windows xpm 条目,所以 gRPC 在 windows 之外都可解析——一个事实
写两遍,就是下一次只改一处的机会。

mcpp 的谓词语言本来就够用:any()/all()/not() 加 unix 别名
(family == "unix",见 src/build/prepare.cppm 的 match_alias)。

本机核验:cfg(unix) 下 grpc-codegen 照常解析出 c-ares/openssl/re2/zlib。

Author: Sunrisepeak

tests/examples/grpc-codegen/mcpp.toml

@@ -28,16 +28,14 @@
 name    = "grpc-codegen-tests"
 version = "0.1.0"
 
-[target.'cfg(linux)'.dependencies.grpc]
+# `cfg(unix)`, not one block per OS: the condition is "everywhere gRPC
+# resolves", and what excludes windows is compat.openssl having no xpm entry
+# there — a single fact, so a single predicate. mcpp evaluates `unix` as
+# family == "unix" (src/build/prepare.cppm, alongside any()/all()/not()).
+[target.'cfg(unix)'.dependencies.grpc]
 grpc = { version = "1.83.0", features = ["codegen"] }
 
-[target.'cfg(linux)'.build]
-cxxflags = ["-DHAVE_GRPC=1"]
-
-[target.'cfg(macos)'.dependencies.grpc]
-grpc = { version = "1.83.0", features = ["codegen"] }
-
-[target.'cfg(macos)'.build]
+[target.'cfg(unix)'.build]
 cxxflags = ["-DHAVE_GRPC=1"]
 
 # windows carries the RULE but not gRPC itself, so build.mcpp compiles (its

tests/examples/grpc-module/mcpp.toml

@@ -18,20 +18,19 @@
 name = "grpc-module-tests"
 version = "0.1.0"
 
-# linux + macOS only: the package has no windows xpm entry (its compat.openssl
+# unix only: the package has no windows xpm entry (its compat.openssl
 # dependency has none yet), so on windows this member carries no dependency at
 # all and the test compiles to a no-op main() — the same shape
 # tests/examples/openssl uses for the same underlying reason.
-[target.'cfg(linux)'.dependencies.grpc]
-grpc = "1.83.0"
-
-[target.'cfg(linux)'.build]
-cxxflags = ["-DHAVE_GRPC=1"]
-
-[target.'cfg(macos)'.dependencies.grpc]
+#
+# One `cfg(unix)` rather than a linux block and an identical macos block: the
+# condition is a single fact ("gRPC resolves everywhere except windows"), so it
+# should be written once. mcpp evaluates `unix` as family == "unix"
+# (src/build/prepare.cppm, alongside any()/all()/not()).
+[target.'cfg(unix)'.dependencies.grpc]
 grpc = "1.83.0"
 
-[target.'cfg(macos)'.build]
+[target.'cfg(unix)'.build]
 cxxflags = ["-DHAVE_GRPC=1"]
 
 [indices]