From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Sat, 9 Nov 2024 13:29:41 +0100
Subject: [PATCH 1/1] Only use `dllexport`/`dllimport` on MSVC

This reverts commit fefce85ca9057a31167d16d17aea9fee9bf95869 and
26050190264a1c70d27963712a083ac284267c06.

Whereas GCC exports all symbols when the `dllexport`/`dllimport`
attributes are not specified, Clang natively supports
`-fvisibility=hidden` for Windows targets.

This ensures that nothing is exported for static builds, see:
https://github.com/strukturag/libheif/issues/513
https://github.com/strukturag/libheif/issues/902

Upstream-Status: Inappropriate [other]
Upstream may still use GCC.

diff --git a/libheif/api/libheif/heif_export.h b/libheif/api/libheif/heif_export.h
index 1111111..2222222 100644
--- a/libheif/api/libheif/heif_export.h
+++ b/libheif/api/libheif/heif_export.h
@@ -29,7 +29,7 @@
 // the heif_error type while heif_error.h needs LIBHEIF_API), so the macro
 // cannot live in either of them if both are to compile standalone.
 
-#if (defined(_WIN32) || defined __CYGWIN__) && !defined(LIBHEIF_STATIC_BUILD)
+#if defined(_MSC_VER) && !defined(LIBHEIF_STATIC_BUILD)
 #ifdef LIBHEIF_EXPORTS
 #define LIBHEIF_API __declspec(dllexport)
 #else