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From: Michael Tokarev <mjt@tls.msk.ru>
Subject: mark internal codegen helpers to be hidden
Date: Sat, 04 Jan 2025 13:53:36 +0300
Forwarded: not-needed
QEMU TCG uses arrays of pointers to functions for its
code generator. In 7.2, these functions are declared as
static inline. However, at least on some platforms, GCC
tries to make these functions visible to be used in a DSO.
And this makes the linker to fail at least on some platforms,
https://gitlab.com/qemu-project/qemu/-/issues/1129.
Mark the internal generated helper functions to have hidden
visibility, so gcc does not generate code for sharing them,
which makes GOT significantly smaller (and the actual code
to access these functions a bit more efficient too).
In later versions, qemu changed this place to use different
way, so this problem does not exist in more recent qemu.
diff --git a/include/exec/helper-gen.h b/include/exec/helper-gen.h
--- a/include/exec/helper-gen.h
+++ b/include/exec/helper-gen.h
@@ -78,9 +78,11 @@ static inline void glue(gen_helper_, name)(dh_retvar_decl(ret) \
tcg_gen_callN(HELPER(name), dh_retvar(ret), 7, args); \
}
+#pragma GCC visibility push(hidden)
#include "helper.h"
#include "accel/tcg/tcg-runtime.h"
#include "accel/tcg/plugin-helpers.h"
+#pragma GCC visibility pop
#undef DEF_HELPER_FLAGS_0
#undef DEF_HELPER_FLAGS_1
diff --git a/include/exec/helper-proto.h b/include/exec/helper-proto.h
--- a/include/exec/helper-proto.h
+++ b/include/exec/helper-proto.h
@@ -37,9 +37,11 @@ dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
#define IN_HELPER_PROTO
+#pragma GCC visibility push(hidden)
#include "helper.h"
#include "accel/tcg/tcg-runtime.h"
#include "accel/tcg/plugin-helpers.h"
+#pragma GCC visibility pop
#undef IN_HELPER_PROTO
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