From a2500c761ba3740dd416eaebac808f7c8d93aef7 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Wed, 28 Feb 2024 21:33:56 +0000
Subject: ar mode: -Wdlsyms: require an accompanying -Wdlunit argument.

---
 include/slibtool/slibtool.h |  1 +
 src/logic/slbt_exec_ar.c    | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index ffa41c2..bd5b31d 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -128,6 +128,7 @@ enum slbt_custom_error {
 	SLBT_ERR_AR_INVALID_ARMAP_STRING_TABLE,
 	SLBT_ERR_AR_INVALID_ARMAP_MEMBER_OFFSET,
 	SLBT_ERR_AR_INVALID_ARMAP_NAME_OFFSET,
+	SLBT_ERR_AR_DLUNIT_NOT_SPECIFIED,
 	SLBT_ERR_AR_OUTPUT_NOT_SPECIFIED,
 	SLBT_ERR_AR_OUTPUT_NOT_APPLICABLE,
 };
diff --git a/src/logic/slbt_exec_ar.c b/src/logic/slbt_exec_ar.c
index 2abf7f2..ad8896c 100644
--- a/src/logic/slbt_exec_ar.c
+++ b/src/logic/slbt_exec_ar.c
@@ -307,7 +307,19 @@ int slbt_exec_ar(const struct slbt_driver_ctx * dctx)
 		(void)0;
 
 	} else if (cctx->fmtflags & SLBT_OUTPUT_ARCHIVE_DLSYMS) {
-		(void)0;
+		if (!cctx->dlunit)
+			slbt_dprintf(fderr,
+				"%s: missing -Wdlunit: generation of a dlsyms vtable "
+				"requires the name of the dynamic library, executable "
+				"program, or dynamic module for which the vtable would "
+				"be generated.\n",
+				dctx->program);
+
+		return slbt_exec_ar_fail(
+			ectx,meta,
+			SLBT_CUSTOM_ERROR(
+				dctx,
+				SLBT_ERR_AR_DLUNIT_NOT_SPECIFIED));
 
 	} else if (!(cctx->drvflags & SLBT_DRIVER_MODE_AR_ACTIONS)) {
 		if (cctx->drvflags & SLBT_DRIVER_VERBOSITY_ERRORS)
-- 
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