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71 lines
2.5 KiB
71 lines
2.5 KiB
3 years ago
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From a1bff4255fb9cad501a8a5d4bffb8f95df0f615f Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
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Date: Thu, 13 Aug 2020 18:51:50 +0200
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Subject: [PATCH] crypt-port: Add the bits for compiling with link-time
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optimization.
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GCC 10.2 and LLVM/Clang 10 offer initial support for building
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libraries, that are using symbol versioning features, with LTO.
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To make use of this with GCC 10.2, the exported versioned symbols
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need to be declared explicitly with __attribute__((symver (...))).
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LLVM/Clang 10 supports symbol versioning with LTO out of the box
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without any changes needed.
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Fixes #24.
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---
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lib/crypt-port.h | 25 ++++++++++++++++++++++++-
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1 file changed, 24 insertions(+), 1 deletion(-)
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diff --git a/lib/crypt-port.h b/lib/crypt-port.h
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index bec36ac..ca86261 100644
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--- a/lib/crypt-port.h
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+++ b/lib/crypt-port.h
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@@ -179,11 +179,29 @@ _crypt_strcpy_or_abort (void *, const size_t, const void *);
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# define _strong_alias(name, aliasname) \
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extern __typeof (name) aliasname __THROW __attribute__ ((alias (#name)))
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+/* Starting with GCC 10.2, we can use the symver attribute, which also works
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+ with link-time optimization enabled. */
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+# if __GNUC__ > 10 || (__GNUC__ == 10 && __GNUC_MINOR__ >= 2)
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+
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+/* Referencing specific _compatibility_ symbols still needs inline asm. */
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+# define _symver_ref(extstr, intname, version) \
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+ __asm__ (".symver " #intname "," extstr "@" #version)
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+
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+/* Set the symbol version for EXTNAME, which uses INTNAME as its
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+ implementation. */
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+# define symver_set(extstr, intname, version, mode) \
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+ extern __typeof (intname) intname __THROW \
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+ __attribute__((symver (extstr mode #version)))
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+
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+# else
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+
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/* Set the symbol version for EXTNAME, which uses INTNAME as its
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implementation. */
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# define symver_set(extstr, intname, version, mode) \
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__asm__ (".symver " #intname "," extstr mode #version)
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+# endif
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+
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#else
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# error "Don't know how to do symbol versioning with this compiler"
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#endif
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@@ -239,9 +257,14 @@ _crypt_strcpy_or_abort (void *, const size_t, const void *);
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/* Tests may need to _refer_ to compatibility symbols, but should never need
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to _define_ them. */
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-
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#define symver_ref(extstr, intname, version) \
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+ _symver_ref(extstr, intname, version)
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+
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+/* Generic way for referencing specific _compatibility_ symbols. */
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+#ifndef _symver_ref
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+#define _symver_ref(extstr, intname, version) \
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symver_set(extstr, intname, version, "@")
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+#endif
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/* Define configuration macros used during compile-time by the
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GOST R 34.11-2012 "Streebog" hash function. */
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