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8379202: Support linktime-gc on Linux with clang

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Reviewed-by: jwaters, clanger, erikj
This commit is contained in:
Matthias Baesken 2026-03-06 09:04:54 +00:00
parent a2ad080989
commit dc6f7014aa
2 changed files with 9 additions and 0 deletions
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5
make/autoconf/flags-cflags.m4
View File

@ -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"

4
make/autoconf/flags-ldflags.m4
View File

@ -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 \