From 0d8bf80364a23d9b90ab6c034625b60e4c566c61 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 19 Apr 2024 14:58:38 -0400
Subject: config: Check for aligned_alloc()

---
 config/aligned-alloc.c | 8 ++++++++
 config/header.mk       | 1 +
 src/alloc.c            | 6 +++---
 3 files changed, 12 insertions(+), 3 deletions(-)
 create mode 100644 config/aligned-alloc.c

diff --git a/config/aligned-alloc.c b/config/aligned-alloc.c
new file mode 100644
index 0000000..4460038
--- /dev/null
+++ b/config/aligned-alloc.c
@@ -0,0 +1,8 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <stdlib.h>
+
+int main(void) {
+	return !aligned_alloc(_Alignof(void *), sizeof(void *));
+}
diff --git a/config/header.mk b/config/header.mk
index 06b8f7f..86a4dc5 100644
--- a/config/header.mk
+++ b/config/header.mk
@@ -10,6 +10,7 @@ include config/exports.mk
 # All header fragments we generate
 HEADERS := \
     ${GEN}/acl-is-trivial-np.h \
+    ${GEN}/aligned-alloc.h \
     ${GEN}/confstr.h \
     ${GEN}/fdclosedir.h \
     ${GEN}/getdents.h \
diff --git a/src/alloc.c b/src/alloc.c
index ec8608f..ebaff38 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -24,12 +24,12 @@ static void *xmemalign(size_t align, size_t size) {
 	bfs_assert(align >= sizeof(void *));
 	bfs_assert(is_aligned(align, size));
 
-#if __APPLE__
+#if BFS_HAS_ALIGNED_ALLOC
+	return aligned_alloc(align, size);
+#else
 	void *ptr = NULL;
 	errno = posix_memalign(&ptr, align, size);
 	return ptr;
-#else
-	return aligned_alloc(align, size);
 #endif
 }
 
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