From 2abf7fecb5162e4b59ba134c813ebee839eb45e9 Mon Sep 17 00:00:00 2001
From: Simo Sorce <simo@redhat.com>
Date: Wed, 14 Jul 2021 10:52:01 -0400
Subject: [PATCH] Use GCCs __symver__ attribute

This is needed to allow LTO builds, as the __asm__ directives do not give
enough context to the compiler and the build fails when the -flto flag is
passed in.

Unfotunately __symver__ is avilbel only startig from GCC 10, so we need
more macro juggling.

Signed-off-by: Simo Sorce <simo@redhat.com>
---
 lib/internal.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/internal.h b/lib/internal.h
index 29fdb7b..64dad24 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -350,6 +350,16 @@ static inline int io_getevents(__attribute__((unused)) aio_context_t ctx,
 #if __GNUC__ >= 4
 # define DSO_PUBLIC __attribute__ ((visibility ("default")))
 
+#if __GNUC__ >= 10
+# define IMPL_SYMVER(name, version) \
+    __attribute__ ((visibility ("default"))) \
+    __attribute__((__symver__("kcapi_" #name "@@LIBKCAPI_" version)))
+
+# define ORIG_SYMVER(name, version) \
+    __attribute__ ((visibility ("default"))) \
+    __attribute__((__symver__("kcapi_" #name "@LIBKCAPI_" version)))
+
+#else
 # define IMPL_SYMVER(name, version) \
     __asm__(".global impl_" #name ";"\
 	    ".symver impl_" #name ",kcapi_" #name "@@LIBKCAPI_" version);\
@@ -359,6 +369,7 @@ static inline int io_getevents(__attribute__((unused)) aio_context_t ctx,
     __asm__(".global orig_" #name ";"\
 	    ".symver orig_" #name ",kcapi_" #name "@LIBKCAPI_" version);\
     __attribute__ ((visibility ("default")))
+#endif
 
 #else
 # error "Compiler version too old"
-- 
2.31.1