Move mingw dlltool invocation to cg_ssa

compiler/rustc_codegen_llvm/messages.ftl

@@ -1,23 +1,13 @@
 codegen_llvm_copy_bitcode = failed to copy bitcode to object file: {$err}
 
-codegen_llvm_dlltool_fail_import_library =
-    Dlltool could not create import library with {$dlltool_path} {$dlltool_args}:
-    {$stdout}
-    {$stderr}
-
 codegen_llvm_dynamic_linking_with_lto =
     cannot prefer dynamic linking when performing LTO
     .note = only 'staticlib', 'bin', and 'cdylib' outputs are supported with LTO
 
-codegen_llvm_error_calling_dlltool =
-    Error calling dlltool '{$dlltool_path}': {$error}
 
 codegen_llvm_error_creating_import_library =
     Error creating import library for {$lib_name}: {$error}
 
-codegen_llvm_error_writing_def_file =
-    Error writing .DEF file: {$error}
-
 codegen_llvm_fixed_x18_invalid_arch = the `-Zfixed-x18` flag is not supported on the `{$arch}` architecture
 
 codegen_llvm_from_llvm_diag = {$message}

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -1,20 +1,19 @@
 //! A helper class for dealing with static archives
 
-use std::ffi::{c_char, c_void, CStr, CString, OsString};
+use std::ffi::{c_char, c_void, CStr, CString};
 use std::path::{Path, PathBuf};
-use std::{env, io, mem, ptr, str};
+use std::{io, mem, ptr, str};
 
 use rustc_codegen_ssa::back::archive::{
-    try_extract_macho_fat_archive, ArArchiveBuilder, ArchiveBuildFailure, ArchiveBuilder,
+    create_mingw_dll_import_lib, try_extract_macho_fat_archive, ArArchiveBuilder,
-    ArchiveBuilderBuilder, ObjectReader, UnknownArchiveKind, DEFAULT_OBJECT_READER,
+    ArchiveBuildFailure, ArchiveBuilder, ArchiveBuilderBuilder, ObjectReader, UnknownArchiveKind,
+    DEFAULT_OBJECT_READER,
 };
 use rustc_codegen_ssa::common;
 use rustc_session::Session;
 use tracing::trace;
 
-use crate::errors::{
+use crate::errors::ErrorCreatingImportLibrary;
-    DlltoolFailImportLibrary, ErrorCallingDllTool, ErrorCreatingImportLibrary, ErrorWritingDEFFile,
-};
 use crate::llvm::archive_ro::{ArchiveRO, Child};
 use crate::llvm::{self, ArchiveKind, LLVMMachineType, LLVMRustCOFFShortExport};
 
@@ -121,95 +120,18 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
         import_name_and_ordinal_vector: Vec<(String, Option<u16>)>,
         output_path: &Path,
     ) {
-        let target = &sess.target;
+        if common::is_mingw_gnu_toolchain(&sess.target) {
-        let mingw_gnu_toolchain = common::is_mingw_gnu_toolchain(target);
-
-        if mingw_gnu_toolchain {
             // The binutils linker used on -windows-gnu targets cannot read the import
             // libraries generated by LLVM: in our attempts, the linker produced an .EXE
             // that loaded but crashed with an AV upon calling one of the imported
             // functions. Therefore, use binutils to create the import library instead,
             // by writing a .DEF file to the temp dir and calling binutils's dlltool.
-            let def_file_path = output_path.with_extension("def");
+            create_mingw_dll_import_lib(
-
+                sess,
-            let def_file_content = format!(
+                lib_name,
-                "EXPORTS\n{}",
+                import_name_and_ordinal_vector,
-                import_name_and_ordinal_vector
+                output_path,
-                    .into_iter()
-                    .map(|(name, ordinal)| {
-                        match ordinal {
-                            Some(n) => format!("{name} @{n} NONAME"),
-                            None => name,
-                        }
-                    })
-                    .collect::<Vec<String>>()
-                    .join("\n")
             );
-
-            match std::fs::write(&def_file_path, def_file_content) {
-                Ok(_) => {}
-                Err(e) => {
-                    sess.dcx().emit_fatal(ErrorWritingDEFFile { error: e });
-                }
-            };
-
-            // --no-leading-underscore: For the `import_name_type` feature to work, we need to be
-            // able to control the *exact* spelling of each of the symbols that are being imported:
-            // hence we don't want `dlltool` adding leading underscores automatically.
-            let dlltool = find_binutils_dlltool(sess);
-            let temp_prefix = {
-                let mut path = PathBuf::from(&output_path);
-                path.pop();
-                path.push(lib_name);
-                path
-            };
-            // dlltool target architecture args from:
-            // https://github.com/llvm/llvm-project-release-prs/blob/llvmorg-15.0.6/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp#L69
-            let (dlltool_target_arch, dlltool_target_bitness) = match sess.target.arch.as_ref() {
-                "x86_64" => ("i386:x86-64", "--64"),
-                "x86" => ("i386", "--32"),
-                "aarch64" => ("arm64", "--64"),
-                "arm" => ("arm", "--32"),
-                _ => panic!("unsupported arch {}", sess.target.arch),
-            };
-            let mut dlltool_cmd = std::process::Command::new(&dlltool);
-            dlltool_cmd
-                .arg("-d")
-                .arg(def_file_path)
-                .arg("-D")
-                .arg(lib_name)
-                .arg("-l")
-                .arg(&output_path)
-                .arg("-m")
-                .arg(dlltool_target_arch)
-                .arg("-f")
-                .arg(dlltool_target_bitness)
-                .arg("--no-leading-underscore")
-                .arg("--temp-prefix")
-                .arg(temp_prefix);
-
-            match dlltool_cmd.output() {
-                Err(e) => {
-                    sess.dcx().emit_fatal(ErrorCallingDllTool {
-                        dlltool_path: dlltool.to_string_lossy(),
-                        error: e,
-                    });
-                }
-                // dlltool returns '0' on failure, so check for error output instead.
-                Ok(output) if !output.stderr.is_empty() => {
-                    sess.dcx().emit_fatal(DlltoolFailImportLibrary {
-                        dlltool_path: dlltool.to_string_lossy(),
-                        dlltool_args: dlltool_cmd
-                            .get_args()
-                            .map(|arg| arg.to_string_lossy())
-                            .collect::<Vec<_>>()
-                            .join(" "),
-                        stdout: String::from_utf8_lossy(&output.stdout),
-                        stderr: String::from_utf8_lossy(&output.stderr),
-                    })
-                }
-                _ => {}
-            }
         } else {
             // we've checked for \0 characters in the library name already
             let dll_name_z = CString::new(lib_name).unwrap();
@@ -434,39 +356,3 @@ impl<'a> LlvmArchiveBuilder<'a> {
 fn string_to_io_error(s: String) -> io::Error {
     io::Error::new(io::ErrorKind::Other, format!("bad archive: {s}"))
 }
-
-fn find_binutils_dlltool(sess: &Session) -> OsString {
-    assert!(sess.target.options.is_like_windows && !sess.target.options.is_like_msvc);
-    if let Some(dlltool_path) = &sess.opts.cg.dlltool {
-        return dlltool_path.clone().into_os_string();
-    }
-
-    let tool_name: OsString = if sess.host.options.is_like_windows {
-        // If we're compiling on Windows, always use "dlltool.exe".
-        "dlltool.exe"
-    } else {
-        // On other platforms, use the architecture-specific name.
-        match sess.target.arch.as_ref() {
-            "x86_64" => "x86_64-w64-mingw32-dlltool",
-            "x86" => "i686-w64-mingw32-dlltool",
-            "aarch64" => "aarch64-w64-mingw32-dlltool",
-
-            // For non-standard architectures (e.g., aarch32) fallback to "dlltool".
-            _ => "dlltool",
-        }
-    }
-    .into();
-
-    // NOTE: it's not clear how useful it is to explicitly search PATH.
-    for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) {
-        let full_path = dir.join(&tool_name);
-        if full_path.is_file() {
-            return full_path.into_os_string();
-        }
-    }
-
-    // The user didn't specify the location of the dlltool binary, and we weren't able
-    // to find the appropriate one on the PATH. Just return the name of the tool
-    // and let the invocation fail with a hopefully useful error message.
-    tool_name
-}

compiler/rustc_codegen_llvm/src/errors.rs

@@ -1,4 +1,3 @@
-use std::borrow::Cow;
 use std::ffi::CString;
 use std::path::Path;
 
@@ -71,28 +70,6 @@ pub(crate) struct InvalidMinimumAlignmentTooLarge {
 #[diag(codegen_llvm_sanitizer_memtag_requires_mte)]
 pub(crate) struct SanitizerMemtagRequiresMte;
 
-#[derive(Diagnostic)]
-#[diag(codegen_llvm_error_writing_def_file)]
-pub(crate) struct ErrorWritingDEFFile {
-    pub error: std::io::Error,
-}
-
-#[derive(Diagnostic)]
-#[diag(codegen_llvm_error_calling_dlltool)]
-pub(crate) struct ErrorCallingDllTool<'a> {
-    pub dlltool_path: Cow<'a, str>,
-    pub error: std::io::Error,
-}
-
-#[derive(Diagnostic)]
-#[diag(codegen_llvm_dlltool_fail_import_library)]
-pub(crate) struct DlltoolFailImportLibrary<'a> {
-    pub dlltool_path: Cow<'a, str>,
-    pub dlltool_args: String,
-    pub stdout: Cow<'a, str>,
-    pub stderr: Cow<'a, str>,
-}
-
 #[derive(Diagnostic)]
 #[diag(codegen_llvm_dynamic_linking_with_lto)]
 #[note]

compiler/rustc_codegen_ssa/messages.ftl

@@ -25,8 +25,19 @@ codegen_ssa_copy_path_buf = unable to copy {$source_file} to {$output_path}: {$e
 
 codegen_ssa_create_temp_dir = couldn't create a temp dir: {$error}
 
+codegen_ssa_dlltool_fail_import_library =
+    Dlltool could not create import library with {$dlltool_path} {$dlltool_args}:
+    {$stdout}
+    {$stderr}
+
+codegen_ssa_error_calling_dlltool =
+    Error calling dlltool '{$dlltool_path}': {$error}
+
 codegen_ssa_error_creating_remark_dir = failed to create remark directory: {$error}
 
+codegen_ssa_error_writing_def_file =
+    Error writing .DEF file: {$error}
+
 codegen_ssa_expected_used_symbol = expected `used`, `used(compiler)` or `used(linker)`
 
 codegen_ssa_extern_funcs_not_found = some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified

compiler/rustc_codegen_ssa/src/back/archive.rs

@@ -1,4 +1,6 @@
+use std::env;
 use std::error::Error;
+use std::ffi::OsString;
 use std::fs::{self, File};
 use std::io::{self, Write};
 use std::path::{Path, PathBuf};
@@ -16,6 +18,7 @@ use tempfile::Builder as TempFileBuilder;
 use super::metadata::search_for_section;
 // Re-exporting for rustc_codegen_llvm::back::archive
 pub use crate::errors::{ArchiveBuildFailure, ExtractBundledLibsError, UnknownArchiveKind};
+use crate::errors::{DlltoolFailImportLibrary, ErrorCallingDllTool, ErrorWritingDEFFile};
 
 pub trait ArchiveBuilderBuilder {
     fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder + 'a>;
@@ -70,6 +73,130 @@ pub trait ArchiveBuilderBuilder {
     }
 }
 
+pub fn create_mingw_dll_import_lib(
+    sess: &Session,
+    lib_name: &str,
+    import_name_and_ordinal_vector: Vec<(String, Option<u16>)>,
+    output_path: &Path,
+) {
+    let def_file_path = output_path.with_extension("def");
+
+    let def_file_content = format!(
+        "EXPORTS\n{}",
+        import_name_and_ordinal_vector
+            .into_iter()
+            .map(|(name, ordinal)| {
+                match ordinal {
+                    Some(n) => format!("{name} @{n} NONAME"),
+                    None => name,
+                }
+            })
+            .collect::<Vec<String>>()
+            .join("\n")
+    );
+
+    match std::fs::write(&def_file_path, def_file_content) {
+        Ok(_) => {}
+        Err(e) => {
+            sess.dcx().emit_fatal(ErrorWritingDEFFile { error: e });
+        }
+    };
+
+    // --no-leading-underscore: For the `import_name_type` feature to work, we need to be
+    // able to control the *exact* spelling of each of the symbols that are being imported:
+    // hence we don't want `dlltool` adding leading underscores automatically.
+    let dlltool = find_binutils_dlltool(sess);
+    let temp_prefix = {
+        let mut path = PathBuf::from(&output_path);
+        path.pop();
+        path.push(lib_name);
+        path
+    };
+    // dlltool target architecture args from:
+    // https://github.com/llvm/llvm-project-release-prs/blob/llvmorg-15.0.6/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp#L69
+    let (dlltool_target_arch, dlltool_target_bitness) = match sess.target.arch.as_ref() {
+        "x86_64" => ("i386:x86-64", "--64"),
+        "x86" => ("i386", "--32"),
+        "aarch64" => ("arm64", "--64"),
+        "arm" => ("arm", "--32"),
+        _ => panic!("unsupported arch {}", sess.target.arch),
+    };
+    let mut dlltool_cmd = std::process::Command::new(&dlltool);
+    dlltool_cmd
+        .arg("-d")
+        .arg(def_file_path)
+        .arg("-D")
+        .arg(lib_name)
+        .arg("-l")
+        .arg(&output_path)
+        .arg("-m")
+        .arg(dlltool_target_arch)
+        .arg("-f")
+        .arg(dlltool_target_bitness)
+        .arg("--no-leading-underscore")
+        .arg("--temp-prefix")
+        .arg(temp_prefix);
+
+    match dlltool_cmd.output() {
+        Err(e) => {
+            sess.dcx().emit_fatal(ErrorCallingDllTool {
+                dlltool_path: dlltool.to_string_lossy(),
+                error: e,
+            });
+        }
+        // dlltool returns '0' on failure, so check for error output instead.
+        Ok(output) if !output.stderr.is_empty() => {
+            sess.dcx().emit_fatal(DlltoolFailImportLibrary {
+                dlltool_path: dlltool.to_string_lossy(),
+                dlltool_args: dlltool_cmd
+                    .get_args()
+                    .map(|arg| arg.to_string_lossy())
+                    .collect::<Vec<_>>()
+                    .join(" "),
+                stdout: String::from_utf8_lossy(&output.stdout),
+                stderr: String::from_utf8_lossy(&output.stderr),
+            })
+        }
+        _ => {}
+    }
+}
+
+fn find_binutils_dlltool(sess: &Session) -> OsString {
+    assert!(sess.target.options.is_like_windows && !sess.target.options.is_like_msvc);
+    if let Some(dlltool_path) = &sess.opts.cg.dlltool {
+        return dlltool_path.clone().into_os_string();
+    }
+
+    let tool_name: OsString = if sess.host.options.is_like_windows {
+        // If we're compiling on Windows, always use "dlltool.exe".
+        "dlltool.exe"
+    } else {
+        // On other platforms, use the architecture-specific name.
+        match sess.target.arch.as_ref() {
+            "x86_64" => "x86_64-w64-mingw32-dlltool",
+            "x86" => "i686-w64-mingw32-dlltool",
+            "aarch64" => "aarch64-w64-mingw32-dlltool",
+
+            // For non-standard architectures (e.g., aarch32) fallback to "dlltool".
+            _ => "dlltool",
+        }
+    }
+    .into();
+
+    // NOTE: it's not clear how useful it is to explicitly search PATH.
+    for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) {
+        let full_path = dir.join(&tool_name);
+        if full_path.is_file() {
+            return full_path.into_os_string();
+        }
+    }
+
+    // The user didn't specify the location of the dlltool binary, and we weren't able
+    // to find the appropriate one on the PATH. Just return the name of the tool
+    // and let the invocation fail with a hopefully useful error message.
+    tool_name
+}
+
 pub trait ArchiveBuilder {
     fn add_file(&mut self, path: &Path);
 

compiler/rustc_codegen_ssa/src/errors.rs

@@ -1024,6 +1024,28 @@ pub struct FailedToGetLayout<'tcx> {
     pub err: LayoutError<'tcx>,
 }
 
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_dlltool_fail_import_library)]
+pub(crate) struct DlltoolFailImportLibrary<'a> {
+    pub dlltool_path: Cow<'a, str>,
+    pub dlltool_args: String,
+    pub stdout: Cow<'a, str>,
+    pub stderr: Cow<'a, str>,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_error_writing_def_file)]
+pub(crate) struct ErrorWritingDEFFile {
+    pub error: std::io::Error,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_error_calling_dlltool)]
+pub(crate) struct ErrorCallingDllTool<'a> {
+    pub dlltool_path: Cow<'a, str>,
+    pub error: std::io::Error,
+}
+
 #[derive(Diagnostic)]
 #[diag(codegen_ssa_error_creating_remark_dir)]
 pub struct ErrorCreatingRemarkDir {