From: Pali Rohár <pali@kernel.org>
Date: Sat, 24 Feb 2024 15:12:26 +0000 (+0100)
Subject: libpci: Define STATIC_ALIAS for DLL Windows builds
X-Git-Tag: v3.11.0~5
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=0e48f9b7af7c4e9a76092db62a1a4d777f59c170;p=pciutils.git

libpci: Define STATIC_ALIAS for DLL Windows builds

Windows builds for versioned symbols use inline asm .set directive which in
some cases makes x86-64 LTO compiler to drop the referenced value. Define
STATIC_ALIAS macro with VERSIONED_ABI (used) attribute which forces LTO
compiler to not drop the symbol from the final DLL library.
---

diff --git a/lib/internal.h b/lib/internal.h
index 549f94c..68e9fa0 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -24,14 +24,15 @@
 #define DEFINE_ALIAS(_decl, _for)
 #define SYMBOL_VERSION(_int, _ext)
 #else
-#define STATIC_ALIAS(_decl, _for)
 #define DEFINE_ALIAS(_decl, _for) extern _decl __attribute__((alias(#_for))) VERSIONED_ABI
 #ifdef _WIN32
+#define STATIC_ALIAS(_decl, _for) VERSIONED_ABI _decl { return _for; }
 /* GCC does not support asm .symver directive for Windows targets, so define new external global function symbol as alias to internal symbol */
 #define SYMBOL_VERSION(_int, _ext) asm(".globl\t" PCI_STRINGIFY(__MINGW_USYMBOL(_ext)) "\n\t" \
                                        ".def\t"   PCI_STRINGIFY(__MINGW_USYMBOL(_ext)) ";\t.scl\t2;\t.type\t32;\t.endef\n\t" \
                                        ".set\t"   PCI_STRINGIFY(__MINGW_USYMBOL(_ext)) "," PCI_STRINGIFY(__MINGW_USYMBOL(_int)))
 #else
+#define STATIC_ALIAS(_decl, _for)
 #define SYMBOL_VERSION(_int, _ext) asm(".symver " #_int "," #_ext)
 #endif
 #endif