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bootstrap.c
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bootstrap.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
static const char *get_c_compiler(void) {
const char *cc = getenv("CC");
return (cc == NULL) ? "cc" : cc;
}
static void panic(const char *reason) {
fprintf(stderr, "%s\n", reason);
abort();
}
#if defined(__WIN32__)
#error TODO write the functionality for executing child process into this build script
#else
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
static void run(char **argv) {
pid_t pid = fork();
if (pid == -1)
panic("fork failed");
if (pid == 0) {
// child
execvp(argv[0], argv);
exit(1);
}
// parent
int status;
waitpid(pid, &status, 0);
if (!WIFEXITED(status))
panic("child process crashed");
if (WEXITSTATUS(status) != 0)
panic("child process failed");
}
static void run_execv(char **argv) {
if (execv(argv[0], argv) == -1 && errno == ENOENT) return;
perror("execv failed");
}
#endif
static void print_and_run(const char **argv) {
fprintf(stderr, "%s", argv[0]);
for (const char **arg = argv 1; *arg; arg = 1) {
fprintf(stderr, " %s", *arg);
}
fprintf(stderr, "\n");
run((char **)argv);
}
static const char *get_host_os(void) {
#if defined(__WIN32__)
return "windows";
#elif defined(__APPLE__)
return "macos";
#elif defined(__linux__)
return "linux";
#else
#error TODO implement get_host_os in this build script for this target
#endif
}
static const char *get_host_arch(void) {
#if defined(__x86_64__ )
return "x86_64";
#elif defined(__aarch64__)
return "aarch64";
#else
#error TODO implement get_host_arch in this build script for this target
#endif
}
static const char *get_host_triple(void) {
static char global_buffer[100];
sprintf(global_buffer, "%s-%s", get_host_arch(), get_host_os());
return global_buffer;
}
int main(int argc, char **argv) {
argv[0] = "./zig2";
run_execv(argv);
const char *cc = get_c_compiler();
const char *host_triple = get_host_triple();
{
const char *child_argv[] = {
cc, "-o", "zig-wasm2c", "stage1/wasm2c.c", "-O2", "-std=c99", NULL,
};
print_and_run(child_argv);
}
{
const char *child_argv[] = {
"./zig-wasm2c", "stage1/zig1.wasm", "zig1.c", NULL,
};
print_and_run(child_argv);
}
{
const char *child_argv[] = {
cc, "-o", "zig1", "zig1.c", "stage1/wasi.c", "-std=c99", "-Os", "-lm", NULL,
};
print_and_run(child_argv);
}
{
FILE *f = fopen("config.zig", "wb");
if (f == NULL)
panic("unable to open config.zig for writing");
const char *zig_version = "0.12.0-dev.bootstrap";
int written = fprintf(f,
"pub const have_llvm = false;\n"
"pub const llvm_has_m68k = false;\n"
"pub const llvm_has_csky = false;\n"
"pub const llvm_has_arc = false;\n"
"pub const llvm_has_xtensa = false;\n"
"pub const version: [:0]const u8 = \"%s\";\n"
"pub const semver = @import(\"std\").SemanticVersion.parse(version) catch unreachable;\n"
"pub const enable_logging: bool = false;\n"
"pub const enable_link_snapshots: bool = false;\n"
"pub const enable_tracy = false;\n"
"pub const value_tracing = false;\n"
"pub const skip_non_native = false;\n"
"pub const only_c = false;\n"
"pub const force_gpa = false;\n"
"pub const only_core_functionality = true;\n"
"pub const only_reduce = false;\n"
, zig_version);
if (written < 100)
panic("unable to write to config.zig file");
if (fclose(f) != 0)
panic("unable to finish writing to config.zig file");
}
{
const char *child_argv[] = {
"./zig1", "lib", "build-exe", "src/main.zig",
"-ofmt=c", "-lc", "-OReleaseSmall",
"--name", "zig2", "-femit-bin=zig2.c",
"--mod", "build_options::config.zig",
"--mod", "Builtins/Builtin.def::src/stubs/aro_builtins.zig",
"--mod", "Attribute/names.def::src/stubs/aro_names.zig",
"--mod", "aro:Builtins/Builtin.def,Attribute/names.def:deps/aro/lib.zig",
"--deps", "build_options,aro",
"-target", host_triple,
NULL,
};
print_and_run(child_argv);
}
{
const char *child_argv[] = {
"./zig1", "lib", "build-obj", "lib/compiler_rt.zig",
"-ofmt=c", "-OReleaseSmall",
"--name", "compiler_rt", "-femit-bin=compiler_rt.c",
"--mod", "build_options::config.zig",
"--deps", "build_options",
"-target", host_triple,
NULL,
};
print_and_run(child_argv);
}
{
const char *child_argv[] = {
cc, "-o", "zig2", "zig2.c", "compiler_rt.c",
"-std=c99", "-O2", "-fno-stack-protector",
"-Wl,-z,stack-size=0x10000000", "-Istage1", NULL,
};
print_and_run(child_argv);
}
run_execv(argv);
panic("build script failed to create valid zig2 executable");
}