[DO NOT MERGE] measurement for #693: which process exits, and the encoding build.ninja is written in

Author: speak-agent

.github/measure-693/fixtures/bmn/build.mcpp

@@ -0,0 +1,18 @@
+// A build program written the way most are: narrow getenv, a narrow path
+// into std::ofstream, the path printed back to mcpp as bytes.
+#include <cstdio>
+#include <cstdlib>
+#include <fstream>
+#include <string>
+
+int main() {
+    const char* out = std::getenv("MCPP_OUT_DIR");
+    if (!out) { std::fputs("no MCPP_OUT_DIR\n", stderr); return 1; }
+    std::string p = std::string(out) + "/gen.cpp";
+    std::ofstream f(p);
+    if (!f) { std::fprintf(stderr, "build.mcpp: cannot open %s\n", p.c_str()); return 2; }
+    f << "int gen_value() { return 42; }\n";
+    f.close();
+    std::printf("mcpp:generated=%s\n", p.c_str());
+    return 0;
+}

.github/measure-693/fixtures/bmn/mcpp.toml

@@ -0,0 +1,6 @@
+[package]
+name    = "probe"
+version = "0.1.0"
+
+[toolchain]
+default = "llvm@20.1.7"

.github/measure-693/fixtures/bmn/src/main.cpp

@@ -0,0 +1,8 @@
+#include <cstdio>
+
+int gen_value();
+
+int main() {
+    std::printf("gen_value=%d\n", gen_value());
+    return 0;
+}

.github/measure-693/fixtures/bmw/build.mcpp

@@ -0,0 +1,28 @@
+// A build program that speaks UTF-8 whatever the process code page is: the
+// wide environment, a wide path into std::ofstream, UTF-8 bytes back to mcpp.
+// It stands in for a build program that carries a UTF-8 activeCodePage.
+#include <cstdio>
+#include <cstdlib>
+#include <filesystem>
+#include <fstream>
+#include <string>
+
+int main() {
+#ifdef _WIN32
+    const wchar_t* w = _wgetenv(L"MCPP_OUT_DIR");
+    if (!w) { std::fputs("no MCPP_OUT_DIR\n", stderr); return 1; }
+    std::filesystem::path out(w);
+#else
+    const char* n = std::getenv("MCPP_OUT_DIR");
+    if (!n) { std::fputs("no MCPP_OUT_DIR\n", stderr); return 1; }
+    std::filesystem::path out(n);
+#endif
+    auto p = out / "gen.cpp";
+    std::ofstream f(p);
+    if (!f) { std::fputs("build.mcpp: cannot open the generated file\n", stderr); return 2; }
+    f << "int gen_value() { return 42; }\n";
+    f.close();
+    auto u8 = p.generic_u8string();
+    std::printf("mcpp:generated=%s\n", reinterpret_cast<const char*>(u8.c_str()));
+    return 0;
+}

.github/measure-693/fixtures/bmw/mcpp.toml

@@ -0,0 +1,6 @@
+[package]
+name    = "probe"
+version = "0.1.0"
+
+[toolchain]
+default = "llvm@20.1.7"

.github/measure-693/fixtures/bmw/src/main.cpp

@@ -0,0 +1,8 @@
+#include <cstdio>
+
+int gen_value();
+
+int main() {
+    std::printf("gen_value=%d\n", gen_value());
+    return 0;
+}

.github/measure-693/fixtures/hello/mcpp.toml

@@ -0,0 +1,6 @@
+[package]
+name    = "probe"
+version = "0.1.0"
+
+[toolchain]
+default = "llvm@20.1.7"

.github/measure-693/fixtures/hello/src/main.cpp

@@ -0,0 +1,6 @@
+import std;
+
+int main() {
+    std::println("hello from a project whose path is not ASCII");
+    return 0;
+}