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8371893: [macOS aarch64] use dead_strip linker option to reduce binary size #28319

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8371893: [macOS aarch64] use dead_strip linker option to reduce binary size #28319

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1c5a43f
JDK-8371893
MBaesken Nov 14, 2025
07251ff
_ZTV8Metadata should not be eliminated
MBaesken Nov 20, 2025
b41966b
Fix Windows issues
MBaesken Nov 20, 2025
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3 changes: 3 additions & 0 deletions make/autoconf/flags-ldflags.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,9 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],

# Setup OS-dependent LDFLAGS
if test "x$OPENJDK_TARGET_OS" = xmacosx && test "x$TOOLCHAIN_TYPE" = xclang; then
if test "x$OPENJDK_TARGET_CPU" = xaarch64; then
BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,-dead_strip"
fi
# FIXME: We should really generalize SetSharedLibraryOrigin instead.
OS_LDFLAGS_JVM_ONLY="-Wl,-rpath,@loader_path/. -Wl,-rpath,@loader_path/.."
OS_LDFLAGS="-mmacosx-version-min=$MACOSX_VERSION_MIN -Wl,-reproducible"
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10 changes: 10 additions & 0 deletions src/hotspot/share/oops/metadata.cpp
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Expand Up @@ -26,6 +26,16 @@
#include "oops/metadata.hpp"
#include "prims/jvmtiRedefineClasses.hpp"

#if defined(__APPLE__)
extern void* _ZTV8Metadata[];

// avoid code stripping which disturbs the serviceability agent
__attribute__((used))
void* dead_strip_helper() {
return _ZTV8Metadata[0];
}
#endif

void Metadata::set_on_stack(const bool value) {
// nothing to set for most metadata
// Can't inline because this materializes the vtable on some C++ compilers.
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