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gh-101060: conditionally add -fno-reorder-blocks-and-partition #101061

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Jan 24, 2023
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gh-101060: conditionally add -fno-reorder-blocks-and-partition #101061

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Build/2023-01-15-11-22-15.gh-issue-101060.0mYk9E.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Conditionally add ``-fno-reorder-blocks-and-partition`` in configure.
Effectively fixes ``--enable-bolt`` when using Clang, as this appears to be
a GCC-only flag.
41 changes: 40 additions & 1 deletion configure
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7 changes: 6 additions & 1 deletion configure.ac
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Expand Up @@ -1939,8 +1939,13 @@ if test "$Py_BOLT" = 'true' ; then
DEF_MAKE_ALL_RULE="bolt-opt"
DEF_MAKE_RULE="build_all"

# -fno-reorder-blocks-and-partition is required for bolt to work.
# Possibly GCC only.
AX_CHECK_COMPILE_FLAG([-fno-reorder-blocks-and-partition],[
CFLAGS_NODIST="$CFLAGS_NODIST -fno-reorder-blocks-and-partition"
])

# 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:
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