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From 2abf7fecb5162e4b59ba134c813ebee839eb45e9 Mon Sep 17 00:00:00 2001
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From: Simo Sorce <simo@redhat.com>
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Date: Wed, 14 Jul 2021 10:52:01 -0400
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Subject: [PATCH] Use GCCs __symver__ attribute
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This is needed to allow LTO builds, as the __asm__ directives do not give
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enough context to the compiler and the build fails when the -flto flag is
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passed in.
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Unfotunately __symver__ is avilbel only startig from GCC 10, so we need
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more macro juggling.
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Signed-off-by: Simo Sorce <simo@redhat.com>
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---
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lib/internal.h | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/lib/internal.h b/lib/internal.h
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index 29fdb7b..64dad24 100644
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--- a/lib/internal.h
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+++ b/lib/internal.h
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@@ -350,6 +350,16 @@ static inline int io_getevents(__attribute__((unused)) aio_context_t ctx,
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#if __GNUC__ >= 4
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# define DSO_PUBLIC __attribute__ ((visibility ("default")))
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+#if __GNUC__ >= 10
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+# define IMPL_SYMVER(name, version) \
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+ __attribute__ ((visibility ("default"))) \
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+ __attribute__((__symver__("kcapi_" #name "@@LIBKCAPI_" version)))
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+
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+# define ORIG_SYMVER(name, version) \
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+ __attribute__ ((visibility ("default"))) \
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+ __attribute__((__symver__("kcapi_" #name "@LIBKCAPI_" version)))
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+
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+#else
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# define IMPL_SYMVER(name, version) \
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__asm__(".global impl_" #name ";"\
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".symver impl_" #name ",kcapi_" #name "@@LIBKCAPI_" version);\
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@@ -359,6 +369,7 @@ static inline int io_getevents(__attribute__((unused)) aio_context_t ctx,
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__asm__(".global orig_" #name ";"\
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".symver orig_" #name ",kcapi_" #name "@LIBKCAPI_" version);\
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__attribute__ ((visibility ("default")))
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+#endif
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#else
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# error "Compiler version too old"
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--
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2.31.1
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