GeezerVison

AC_MSG_ERROR([llvm-bolt is required for a --enable-bolt build but could not be found.])

fi

# Check for packed relocations (-Wl,-z,pack-relative-relocs) which use DT_RELR format.

# BOLT has issues analyzing these compact relocations.

AC_MSG_CHECKING([for packed relocations in LDFLAGS])

has_packed_relocs="no"

case "$LDFLAGS $LDFLAGS_NODIST" in

*-Wl,-z,pack-relative-relocs*)

has_packed_relocs="yes"

;;

esac

AC_MSG_RESULT([$has_packed_relocs])

# Check BOLT version to determine if we need to skip functions with computed gotos.

AC_MSG_CHECKING([llvm-bolt version])

llvm_bolt_version=$("${LLVM_BOLT}" --version 2>/dev/null | grep -oE '[[0-9]]+\.[[0-9]]+\.[[0-9]]+' | head -1)

AC_MSG_RESULT([${llvm_bolt_version}])

# Parse version

llvm_bolt_major=$(echo "${llvm_bolt_version}" | cut -d. -f1)

llvm_bolt_minor=$(echo "${llvm_bolt_version}" | cut -d. -f2)

bolt_need_skip_computed_goto="yes"

if test -n "${llvm_bolt_major}" && test "${llvm_bolt_major}" -ge 21; then

if test "${llvm_bolt_major}" -gt 21 || test "${llvm_bolt_minor}" -ge 1; then

bolt_need_skip_computed_goto="no"

AC_MSG_RESULT([LLVM ${llvm_bolt_version} supports computed gotos])

fi

fi

AC_SUBST([MERGE_FDATA])

AC_PATH_TOOL([MERGE_FDATA], [merge-fdata], [''], [${llvm_path}])

if test -n "${MERGE_FDATA}" -a -x "${MERGE_FDATA}"

[BOLT_COMMON_FLAGS],

[m4_normalize("

)

dnl BOLT versions before LLVM 21.1.0 don't support computed gotos in PIC compiled code.

dnl Exclude functions containing computed gotos for older versions.

dnl Fixed in LLVM 21.1.0+ via https://github.com/llvm/llvm-project/pull/120267

if test "${bolt_need_skip_computed_goto}" = "yes"; then

dnl Skip base computed goto functions

BOLT_COMMON_FLAGS="${BOLT_COMMON_FLAGS} -skip-funcs=_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1"

dnl GCC's LTO creates .lto_priv.0 clones that also need to be skipped

dnl Skip if packed relocs not present

if test "${has_packed_relocs}" != "yes" && test "${ac_cv_cc_name}" = "gcc" && test "${with_lto}" != "no" && test -n "${with_lto}"; then

BOLT_COMMON_FLAGS="${BOLT_COMMON_FLAGS},sre_ucs1_match.lto_priv.0/1,sre_ucs2_match.lto_priv.0/1,sre_ucs4_match.lto_priv.0/1"

fi

fi

dnl When packed relocations are used, BOLT cannot properly

dnl analyze the DT_RELR format. Build skip list for functions that fail with packed relocs.

if test "${has_packed_relocs}" = "yes"; then

bolt_base="_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1"

bolt_sre_lto="sre_ucs1_match.lto_priv.0/1,sre_ucs2_match.lto_priv.0/1,sre_ucs4_match.lto_priv.0/1"

bolt_all_lto="_PyEval_EvalFrameDefault.lto_priv.0/1,${bolt_sre_lto}"

case "${ac_cv_cc_name}" in

gcc)

dnl GCC's LTO creates .lto_priv.0 variants; PGO creates .localalias variants (in shared builds)

bolt_skip_list=""

dnl Determine what to include based on build configuration

bolt_need_base=$( (test "${bolt_need_skip_computed_goto}" != "yes" && test "${enable_shared}" = "yes") && echo "yes" || echo "no")

bolt_need_lto=$( (test "${with_lto}" != "no" && test -n "${with_lto}") && echo "yes" || echo "no")

bolt_need_pgo=$( (test "${enable_optimizations}" = "yes" && test "${enable_shared}" = "yes") && echo "yes" || echo "no")

dnl Build the skip list

test "${bolt_need_base}" = "yes" && bolt_skip_list="${bolt_base}"

if test "${bolt_need_lto}" = "yes"; then

if test "${enable_shared}" = "yes"; then

test -n "${bolt_skip_list}" && bolt_skip_list="${bolt_skip_list},"

bolt_skip_list="${bolt_skip_list}${bolt_all_lto}"

elif test "${bolt_need_skip_computed_goto}" != "yes"; then

bolt_skip_list="${bolt_all_lto}"

else

dnl BOLT < 21.1.0 + static: need to add LTO variants

test -n "${bolt_skip_list}" && bolt_skip_list="${bolt_skip_list},"

bolt_skip_list="${bolt_skip_list}${bolt_all_lto}"

fi

fi

if test "${bolt_need_pgo}" = "yes"; then

test -n "${bolt_skip_list}" && bolt_skip_list="${bolt_skip_list},"

if test "${bolt_need_lto}" = "yes"; then

bolt_skip_list="${bolt_skip_list}_PyEval_EvalFrameDefault.localalias.lto_priv.0/1"

else

bolt_skip_list="${bolt_skip_list}_PyEval_EvalFrameDefault.localalias/1"

fi

fi

dnl Apply the skip list

if test -n "${bolt_skip_list}"; then

if test "${bolt_need_skip_computed_goto}" = "yes"; then

BOLT_COMMON_FLAGS="${BOLT_COMMON_FLAGS},${bolt_skip_list}"

else

BOLT_COMMON_FLAGS="${BOLT_COMMON_FLAGS} -skip-funcs=${bolt_skip_list}"

fi

fi

;;

clang*)

if test "${bolt_need_skip_computed_goto}" != "yes"; then

BOLT_COMMON_FLAGS="${BOLT_COMMON_FLAGS} -skip-funcs=${bolt_base}"

fi

;;

esac

fi

fi

[BOLT_INSTRUMENT_FLAGS],