From dc6f7014aa3791a5a6fd2b89ac19d88382c16da2 Mon Sep 17 00:00:00 2001 From: Matthias Baesken Date: Fri, 6 Mar 2026 09:04:54 +0000 Subject: [PATCH] 8379202: Support linktime-gc on Linux with clang Reviewed-by: jwaters, clanger, erikj --- make/autoconf/flags-cflags.m4 | 5 +++++ make/autoconf/flags-ldflags.m4 | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/make/autoconf/flags-cflags.m4 b/make/autoconf/flags-cflags.m4 index 2d39d84f52e..ab9cd8be19b 100644 --- a/make/autoconf/flags-cflags.m4 +++ b/make/autoconf/flags-cflags.m4 @@ -578,6 +578,11 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER], TOOLCHAIN_CFLAGS_JDK_CONLY="-fno-strict-aliasing" # technically NOT for CXX fi + if test "x$ENABLE_LINKTIME_GC" = xtrue; then + TOOLCHAIN_CFLAGS_JDK="$TOOLCHAIN_CFLAGS_JDK -ffunction-sections -fdata-sections" + TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -fdata-sections" + fi + if test "x$OPENJDK_TARGET_OS" = xaix; then TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -ftls-model -fno-math-errno" TOOLCHAIN_CFLAGS_JDK="-ffunction-sections -fsigned-char" diff --git a/make/autoconf/flags-ldflags.m4 b/make/autoconf/flags-ldflags.m4 index 466ff1beaf4..7782735be25 100644 --- a/make/autoconf/flags-ldflags.m4 +++ b/make/autoconf/flags-ldflags.m4 @@ -80,6 +80,10 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER], if test "x$CXX_IS_USER_SUPPLIED" = xfalse && test "x$CC_IS_USER_SUPPLIED" = xfalse; then UTIL_REQUIRE_TOOLCHAIN_PROGS(LLD, lld) fi + + if test "x$ENABLE_LINKTIME_GC" = xtrue; then + BASIC_LDFLAGS_JDK_ONLY="$BASIC_LDFLAGS_JDK_ONLY -Wl,--gc-sections" + fi fi if test "x$OPENJDK_TARGET_OS" = xaix; then BASIC_LDFLAGS="-Wl,-b64 -Wl,-brtl -Wl,-bnorwexec -Wl,-blibpath:/usr/lib:lib -Wl,-bnoexpall \