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zig build: search upwards for build.zig file

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closes #2587
This commit is contained in:
Andrew Kelley
2019-07-04 17:43:56 -04:00
parent 47addd87ac
commit 72800f176e
5 changed files with 40 additions and 54 deletions
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84
src/main.cpp
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@@ -261,6 +261,15 @@ static bool get_cache_opt(CacheOpt opt, bool default_value) {
zig_unreachable();
}
static int zig_error_no_build_file(void) {
fprintf(stderr,
"No 'build.zig' file found, in the current directory or any parent directories.\n"
"Initialize a 'build.zig' template file with `zig init-lib` or `zig init-exe`,\n"
"or see `zig --help` for more options.\n"
);
return EXIT_FAILURE;
}
extern "C" int ZigClang_main(int argc, char **argv);
int main(int argc, char **argv) {
@@ -466,8 +475,7 @@ int main(int argc, char **argv) {
return EXIT_FAILURE;
}
const char *zig_exe_path = buf_ptr(&zig_exe_path_buf);
const char *build_file = "build.zig";
bool asked_for_help = false;
const char *build_file = nullptr;
init_all_targets();
@@ -478,7 +486,6 @@ int main(int argc, char **argv) {
args.append(NULL); // placeholder
for (int i = 2; i < argc; i += 1) {
if (strcmp(argv[i], "--help") == 0) {
asked_for_help = true;
args.append(argv[i]);
} else if (i + 1 < argc && strcmp(argv[i], "--build-file") == 0) {
build_file = argv[i + 1];
@@ -511,12 +518,36 @@ int main(int argc, char **argv) {
ZigTarget target;
get_native_target(&target);
Buf *build_file_buf = buf_create_from_str(build_file);
Buf *build_file_buf = buf_create_from_str((build_file != nullptr) ? build_file : "build.zig");
Buf build_file_abs = os_path_resolve(&build_file_buf, 1);
Buf build_file_basename = BUF_INIT;
Buf build_file_dirname = BUF_INIT;
os_path_split(&build_file_abs, &build_file_dirname, &build_file_basename);
for (;;) {
bool build_file_exists;
if ((err = os_file_exists(&build_file_abs, &build_file_exists))) {
fprintf(stderr, "unable to check existence of '%s': %s\n", buf_ptr(&build_file_abs), err_str(err));
return 1;
}
if (build_file_exists)
break;
if (build_file != nullptr) {
// they asked for a specific build file path. only look for that one
return zig_error_no_build_file();
}
Buf *next_dir = buf_alloc();
os_path_dirname(&build_file_dirname, next_dir);
if (buf_eql_buf(&build_file_dirname, next_dir)) {
// no more parent directories to search, give up
return zig_error_no_build_file();
}
os_path_join(next_dir, &build_file_basename, &build_file_abs);
buf_init_from_buf(&build_file_dirname, next_dir);
}
Buf full_cache_dir = BUF_INIT;
if (cache_dir == nullptr) {
os_path_join(&build_file_dirname, buf_create_from_str(default_zig_cache_name), &full_cache_dir);
@@ -534,51 +565,6 @@ int main(int argc, char **argv) {
args.items[2] = buf_ptr(&build_file_dirname);
args.items[3] = buf_ptr(&full_cache_dir);
bool build_file_exists;
if ((err = os_file_exists(&build_file_abs, &build_file_exists))) {
fprintf(stderr, "unable to open '%s': %s\n", buf_ptr(&build_file_abs), err_str(err));
return 1;
}
if (!build_file_exists) {
if (asked_for_help) {
// This usage text has to be synchronized with std/special/build_runner.zig
fprintf(stdout,
"Usage: %s build [options]\n"
"\n"
"General Options:\n"
" --help Print this help and exit\n"
" --verbose Print commands before executing them\n"
" --prefix [path] Override default install prefix\n"
" --search-prefix [path] Add a path to look for binaries, libraries, headers\n"
"\n"
"Project-specific options become available when the build file is found.\n"
"\n"
"Advanced Options:\n"
" --build-file [file] Override path to build.zig\n"
" --cache-dir [path] Override path to cache directory\n"
" --override-std-dir [arg] Override path to Zig standard library\n"
" --override-lib-dir [arg] Override path to Zig lib library\n"
" --verbose-tokenize Enable compiler debug output for tokenization\n"
" --verbose-ast Enable compiler debug output for parsing into an AST\n"
" --verbose-link Enable compiler debug output for linking\n"
" --verbose-ir Enable compiler debug output for Zig IR\n"
" --verbose-llvm-ir Enable compiler debug output for LLVM IR\n"
" --verbose-cimport Enable compiler debug output for C imports\n"
" --verbose-cc Enable compiler debug output for C compilation\n"
"\n"
, zig_exe_path);
return EXIT_SUCCESS;
}
fprintf(stderr,
"No 'build.zig' file found.\n"
"Initialize a 'build.zig' template file with `zig init-lib` or `zig init-exe`,\n"
"or build an executable directly with `zig build-exe $FILENAME.zig`.\n"
"See: `zig build --help` or `zig --help` for more options.\n"
);
return EXIT_FAILURE;
}
ZigPackage *build_pkg = codegen_create_package(g, buf_ptr(&build_file_dirname),
buf_ptr(&build_file_basename), "std.special");
g->root_package->package_table.put(buf_create_from_str("@build"), build_pkg);