initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/private/elfversion.h

@@ -0,0 +1,66 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/private/elfversion.h
+// Purpose:     Helper macro for assigning ELF version to a symbol.
+// Author:      Vadim Zeitlin
+// Created:     2025-04-14
+// Copyright:   (c) 2025 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_PRIVATE_ELFVERSION_H_
+#define _WX_PRIVATE_ELFVERSION_H_
+
+// This symbol is defined by configure if .symver directive is supported.
+#ifdef wxHAVE_ELF_SYMVER
+    // Prefer to use the attribute if it is available, as it works with LTO,
+    // unlike the assembler directive.
+    #ifdef __has_attribute
+        #if __has_attribute(__symver__)
+            #define wxELF_SYMVER(sym, symver) __attribute__((__symver__(symver)))
+        #endif
+    #endif
+
+    #ifndef wxELF_SYMVER
+        #define wxELF_SYMVER(sym, symver) __asm__(".symver " sym "," symver);
+    #endif
+
+    // Using multiple versions for the same symbols may be not supported, in
+    // which case we omit it: this results in generating 2 default versions for
+    // the same symbol, which looks wrong, but doesn't seem to cause any
+    // problems.
+    #ifdef wxHAVE_ELF_SYMVER_MULTIPLE
+        #define wxELF_SYMVER_NON_DEFAULT(sym, ver) wxELF_SYMVER(sym, ver)
+    #else
+        #define wxELF_SYMVER_NON_DEFAULT(sym, ver)
+    #endif
+
+    // Our version tag depends on whether we're using Unicode or not.
+    #if wxUSE_UNICODE
+        #define wxMAKE_ELF_VERSION_TAG(ver) "WXU_" ver
+    #else
+        #define wxMAKE_ELF_VERSION_TAG(ver) "WX_" ver
+    #endif
+
+    // This macro is used to repair ABI compatibility problems with the symbols
+    // versions if any symbols are added with the wrong "3.4" version tag
+    // because their definitions in the version script were erroneous.
+    //
+    // It allows to define both the old, compatible version ("3.4") and the new
+    // ("3.4.N") one for the given symbol to restore ABI compatibility with the
+    // previous releases without breaking it with the release containing the
+    // corrected version.
+    //
+    // The parameters are the mangled symbol name (the simplest way to get is
+    // probably to use nm or readelf on the object file or library) and the
+    // part of the version after "WX[U]_", i.e. the version number itself.
+    //
+    // Note that this macro takes strings, not symbols, and that it includes
+    // the trailing semicolon for consistency with the empty version below.
+    #define wxELF_VERSION_COMPAT(sym, ver) \
+        wxELF_SYMVER_NON_DEFAULT(sym, sym "@" wxMAKE_ELF_VERSION_TAG("3.4")) \
+        wxELF_SYMVER(sym, sym "@@" wxMAKE_ELF_VERSION_TAG(ver))
+#else
+    #define wxELF_VERSION_COMPAT(sym, ver)
+#endif
+
+#endif // _WX_PRIVATE_ELFVERSION_H_