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Using the patch adapted from python/cpython#95908
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| --- configure.ac 2022-11-16 11:37:19.773231374 +0100 | ||
| +++ configure.ac.bolt 2022-11-16 11:37:11.161182410 +0100 | ||
| @@ -1751,7 +1751,16 @@ | ||
| # non-suffixed name in their versioned llvm directory. | ||
|
|
||
| llvm_bin_dir='' | ||
| -llvm_path="${PATH}" | ||
| + | ||
| +AC_ARG_WITH(llvm, | ||
| + AS_HELP_STRING([--with-llvm=PATH], | ||
| + [specify the directory where LLVM binaries are installed]), | ||
| +[ | ||
| + llvm_path=${withval} | ||
| +],[ | ||
| + llvm_path="${PATH}" | ||
| +]) | ||
| + | ||
| if test "${CC}" = "clang" | ||
| then | ||
| clang_bin=`which clang` | ||
| @@ -1889,6 +1898,59 @@ | ||
| LDFLAGS_NODIST="$LDFLAGS_NODIST $LTOFLAGS" | ||
| fi | ||
|
|
||
| +# Enable bolt flags | ||
| +Py_BOLT='false' | ||
| +AC_MSG_CHECKING(for --enable-bolt) | ||
| +AC_ARG_ENABLE(bolt, AS_HELP_STRING( | ||
| + [--enable-bolt], | ||
| + [enable usage of the llvm-bolt post-link optimizer (default is no)]), | ||
| +[ | ||
| +if test "$enableval" != no | ||
| +then | ||
| + Py_BOLT='true' | ||
| + AC_MSG_RESULT(yes); | ||
| +else | ||
| + Py_BOLT='false' | ||
| + AC_MSG_RESULT(no); | ||
| +fi], | ||
| +[AC_MSG_RESULT(no)]) | ||
| + | ||
| +AC_SUBST(PREBOLT_RULE) | ||
| +if test "$Py_BOLT" = 'true' ; then | ||
| + PREBOLT_RULE="${DEF_MAKE_ALL_RULE}" | ||
| + DEF_MAKE_ALL_RULE="bolt-opt" | ||
| + DEF_MAKE_RULE="build_all" | ||
| + | ||
| + # These flags are required for bolt to work: | ||
| + CFLAGS_NODIST="$CFLAGS_NODIST -fno-reorder-blocks-and-partition" | ||
| + LDFLAGS_NODIST="$LDFLAGS_NODIST -Wl,--emit-relocs" | ||
| + | ||
| + # These flags are required to get good performance from bolt: | ||
| + CFLAGS_NODIST="$CFLAGS_NODIST -fno-pie" | ||
| + # We want to add these no-pie flags to linking executables but not shared libraries: | ||
| + LINKCC="$LINKCC -fno-pie -no-pie" | ||
| + # Designate the DWARF version into 4 since the LLVM-BOLT does not support DWARF5 yet. | ||
| + CFLAGS="$CFLAGS -gdwarf-4" | ||
| + LDFLAGS="$LDFLAGS -gdwarf-4" | ||
| + AC_SUBST(LLVM_BOLT) | ||
| + AC_PATH_TOOL(LLVM_BOLT, llvm-bolt, '', ${llvm_path}) | ||
| + if test -n "${LLVM_BOLT}" -a -x "${LLVM_BOLT}" | ||
| + then | ||
| + AC_MSG_RESULT("Found llvm-bolt") | ||
| + else | ||
| + AC_MSG_ERROR([llvm-bolt is required for a --enable-bolt build but could not be found.]) | ||
| + fi | ||
| + | ||
| + AC_SUBST(MERGE_FDATA) | ||
| + AC_PATH_TOOL(MERGE_FDATA, merge-fdata, '', ${llvm_path}) | ||
| + if test -n "${MERGE_FDATA}" -a -x "${MERGE_FDATA}" | ||
| + then | ||
| + AC_MSG_RESULT("Found merge-fdata") | ||
| + else | ||
| + AC_MSG_ERROR([merge-fdata is required for a --enable-bolt build but could not be found.]) | ||
| + fi | ||
| +fi | ||
| + | ||
| # Enable PGO flags. | ||
| AC_SUBST(PGO_PROF_GEN_FLAG) | ||
| AC_SUBST(PGO_PROF_USE_FLAG) |