From 630c304a2dff6be70717224e533c1ad6f01875e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20M=20G=C3=B3mez?= <info@jmgomez.me>
Date: Mon, 12 Aug 2024 17:10:17 +0100
Subject: [PATCH] Adds `SEQ_DECL_SIZE 1` back under `clang` and a test (#23942)

---
 lib/nimbase.h      | 4 +++-
 tests/cpp/fam.h    | 4 ++++
 tests/cpp/tfam.nim | 7 +++++++
 3 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 tests/cpp/fam.h
 create mode 100644 tests/cpp/tfam.nim

diff --git a/lib/nimbase.h b/lib/nimbase.h
index 4674b64c89..cdbb68ff2c 100644
--- a/lib/nimbase.h
+++ b/lib/nimbase.h
@@ -475,7 +475,9 @@ typedef char* NCSTRING;
   } name = {{length, (NI) ((NU)length | NIM_STRLIT_FLAG)}, str}
 
 /* declared size of a sequence/variable length array: */
-#if  defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER)
+#if defined(__cplusplus) && defined(__clang__)
+#  define SEQ_DECL_SIZE 1
+#elif defined(__GNUC__) || defined(_MSC_VER)
 #  define SEQ_DECL_SIZE /* empty is correct! */
 #else
 #  define SEQ_DECL_SIZE 1000000
diff --git a/tests/cpp/fam.h b/tests/cpp/fam.h
new file mode 100644
index 0000000000..ad576425bf
--- /dev/null
+++ b/tests/cpp/fam.h
@@ -0,0 +1,4 @@
+struct Test{
+  ~Test() {
+  }
+};
diff --git a/tests/cpp/tfam.nim b/tests/cpp/tfam.nim
new file mode 100644
index 0000000000..6bd89fe245
--- /dev/null
+++ b/tests/cpp/tfam.nim
@@ -0,0 +1,7 @@
+discard """
+  targets: "cpp"
+"""
+type 
+  Test {.importcpp, header: "fam.h".} = object
+
+let test = newSeq[Test]()
\ No newline at end of file