From: Fabian Parzefall <fabian.parzefall@mailbox.org>
Date: Sun, 26 Jul 2026 11:34:20 +0000 (-0700)
Subject: feat: Enable reflinking .dwo files (#1736)
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ab3cd7b2d47dce49a7bb3c1d7c3ebec93248a13f;p=thirdparty%2Fccache.git

feat: Enable reflinking .dwo files (#1736)
---

diff --git a/src/ccache/core/result.cpp b/src/ccache/core/result.cpp
index f6b7c3827..ac0516806 100644
--- a/src/ccache/core/result.cpp
+++ b/src/ccache/core/result.cpp
@@ -85,8 +85,8 @@ should_store_raw_file(const Config& config, core::result::FileType type)
     return false;
   }
 
-  // Only store object files as raw files since there are several problems with
-  // storing other file types:
+  // Only store object and .dwo files as raw files since there are several
+  // problems with storing other file types:
   //
   // 1. The compiler unlinks object files before writing to them but it doesn't
   //    unlink .d files, so it's possible to corrupt .d files just by running
@@ -101,7 +101,9 @@ should_store_raw_file(const Config& config, core::result::FileType type)
   // files that become large enough that it's of interest to clone or hard link
   // them, so we keep things simple for now. This will also save i-nodes in the
   // cache.
-  return type == core::result::FileType::object;
+  return type == core::result::FileType::object
+
+         || type == core::result::FileType::dwarf_object;
 }
 
 } // namespace
diff --git a/test/suites/fileclone.bash b/test/suites/fileclone.bash
index 833cafffe..1dd110d49 100644
--- a/test/suites/fileclone.bash
+++ b/test/suites/fileclone.bash
@@ -54,4 +54,42 @@ SUITE_fileclone() {
     if grep -q 'Cloning' test.o.*.ccache-log; then
         test_failed "Tried to clone"
     fi
+
+    # -------------------------------------------------------------------------
+    TEST "Split DWARF .dwo file is cloned"
+
+    # Skip if -gsplit-dwarf not supported.
+    touch test.c
+    if ! $COMPILER -c -gsplit-dwarf test.c 2>/dev/null || [ ! -e test.dwo ]; then
+        return
+    fi
+
+    generate_code 1 test.c
+
+    $COMPILER -c -gsplit-dwarf -o reference_test.o test.c
+
+    CCACHE_FILECLONE=1 $CCACHE_COMPILE -c -gsplit-dwarf test.c
+    expect_stat preprocessed_cache_hit 0
+    expect_stat cache_miss 1
+    expect_stat files_in_cache 3
+    expect_equal_object_files reference_test.o test.o
+
+    # Note: CCACHE_DEBUG=1 below is needed for the test case.
+    CCACHE_FILECLONE=1 CCACHE_DEBUG=1 $CCACHE_COMPILE -c -gsplit-dwarf test.c
+    expect_stat preprocessed_cache_hit 1
+    expect_stat cache_miss 1
+    expect_stat files_in_cache 3
+    expect_equal_object_files reference_test.o test.o
+    if ! grep -q 'Cloning.*to test.o' test.o.*.ccache-log; then
+        test_failed "Did not try to clone .o file"
+    fi
+    if ! grep -q 'Cloning.*to test.dwo' test.o.*.ccache-log; then
+        test_failed "Did not try to clone .dwo file"
+    fi
+    if grep -q 'Failed to clone' test.o.*.ccache-log; then
+        test_failed "Failed to clone"
+    fi
+    if grep -q 'Failed to clone' test.dwo.*.ccache-log; then
+        test_failed "Failed to clone"
+    fi
 }