| ... | ... | @@ -120,6 +120,39 @@ pub fn mainArgs(gpa: *Allocator, arena: *Allocator, args: []const []const u8) !v |
| 120 | 120 | fatal("expected command argument", .{}); |
| 121 | 121 | } |
| 122 | 122 | |
| 123 | if (std.Target.current.os.tag != .windows and |
| 124 | std.os.getenvZ("ZIG_IS_DETECTING_LIBC_PATHS") != null) |
| 125 | { |
| 126 | // In this case we have accidentally invoked ourselves as "the system C compiler" |
| 127 | // to figure out where libc is installed. This is essentially infinite recursion |
| 128 | // via child process execution due to the CC environment variable pointing to Zig. |
| 129 | // Here we ignore the CC environment variable and exec `cc` as a child process. |
| 130 | // However it's possible Zig is installed as *that* C compiler as well, which is |
| 131 | // why we have this additional environment variable here to check. |
| 132 | var env_map = try std.process.getEnvMap(arena); |
| 133 | |
| 134 | const inf_loop_env_key = "ZIG_IS_TRYING_TO_NOT_CALL_ITSELF"; |
| 135 | if (env_map.get(inf_loop_env_key) != null) { |
| 136 | fatal("The compilation links against libc, but Zig is unable to provide a libc " ++ |
| 137 | "for this operating system, and no --libc " ++ |
| 138 | "parameter was provided, so Zig attempted to invoke the system C compiler " ++ |
| 139 | "in order to determine where libc is installed. However the system C " ++ |
| 140 | "compiler is `zig cc`, so no libc installation was found.", .{}); |
| 141 | } |
| 142 | try env_map.set(inf_loop_env_key, "1"); |
| 143 | |
| 144 | // Some programs such as CMake will strip the `cc` and subsequent args from the |
| 145 | // CC environment variable. We detect and support this scenario here because of |
| 146 | // the ZIG_IS_DETECTING_LIBC_PATHS environment variable. |
| 147 | if (mem.eql(u8, args[1], "cc")) { |
| 148 | return std.os.execvpe(arena, args[1..], &env_map); |
| 149 | } else { |
| 150 | const modified_args = try arena.dupe([]const u8, args); |
| 151 | modified_args[0] = "cc"; |
| 152 | return std.os.execvpe(arena, modified_args, &env_map); |
| 153 | } |
| 154 | } |
| 155 | |
| 123 | 156 | const cmd = args[1]; |
| 124 | 157 | const cmd_args = args[2..]; |
| 125 | 158 | if (mem.eql(u8, cmd, "build-exe")) { |
| ... | ... | @@ -444,7 +477,10 @@ fn buildOutputType( |
| 444 | 477 | var link_eh_frame_hdr = false; |
| 445 | 478 | var link_emit_relocs = false; |
| 446 | 479 | var each_lib_rpath: ?bool = null; |
| 447 | | var libc_paths_file: ?[]const u8 = null; |
| 480 | var libc_paths_file: ?[]const u8 = std.process.getEnvVarOwned(arena, "ZIG_LIBC") catch |err| switch (err) { |
| 481 | error.EnvironmentVariableNotFound => null, |
| 482 | else => |e| return e, |
| 483 | }; |
| 448 | 484 | var machine_code_model: std.builtin.CodeModel = .default; |
| 449 | 485 | var runtime_args_start: ?usize = null; |
| 450 | 486 | var test_filter: ?[]const u8 = null; |
Andrew Kelley <andrew@ziglang.org> 2020-10-14 02:05:56-07:00
src