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