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Adds a --enable-lto option (Link Time Optimization) #9464

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Merged
zwoop merged 1 commit into from
Feb 28, 2023
Merged

Adds a --enable-lto option (Link Time Optimization) #9464

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3 changes: 3 additions & 0 deletions build/common.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,9 @@ EOF
if test -n "$CXX"; then
echo "CXX=\"$CXX\"; export CXX" >> $1
fi
if test -n "$LD"; then
echo "LD=\"$LD\"; export LD" >> $1
fi
if test -n "$CFLAGS"; then
echo "CFLAGS=\"$CFLAGS\"; export CFLAGS" >> $1
fi
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25 changes: 25 additions & 0 deletions configure.ac
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Expand Up @@ -233,6 +233,17 @@ AC_ARG_ENABLE([tsan],
)
AC_MSG_RESULT([$enable_tsan])

#
# Enable Link Time Optimization. This may need different settings per compiler?
#
AC_MSG_CHECKING([whether to enable LTO])
AC_ARG_ENABLE([lto],
[AS_HELP_STRING([--enable-lto],[turn on Link Time Optimization])],
[],
[enable_lto=no]
)
AC_MSG_RESULT([$enable_lto])

#
# Fast SDK APIs, this disables the parameter checks (assert)
# on all APIs.
Expand Down Expand Up @@ -938,6 +949,19 @@ AS_IF([test x"$enable_werror" = "xyes"], [
TS_ADDTO(debug_opt, -Werror)
])

# Add the necessary flags for LTO
AS_IF([test x"$enable_lto" = "xyes"], [
AS_IF([test "x$ax_cv_c_compiler_vendor" = "xclang"], [
TS_ADDTO(AM_CXXFLAGS, [-flto=thin -fuse-ld=lld])
TS_ADDTO(AM_CFLAGS, [-flto=thin -fuse-ld=lld])
TS_ADDTO(AM_LDFLAGS, [-flto=thin -fuse-ld=lld])
], [
TS_ADDTO(AM_CXXFLAGS, [-flto])
TS_ADDTO(AM_CFLAGS, [-flto])
TS_ADDTO(AM_LDFLAGS, [-flto])
])
])

cc_oflag_opt=$release_opt
cc_oflag_dbg=$debug_opt
cxx_oflag_opt="$release_opt $cxx_opt $cxx_rel"
Expand Down Expand Up @@ -2419,6 +2443,7 @@ AC_MSG_NOTICE([Build option summary:
CC: $CC
CXX: $CXX
CPP: $CPP
LD: $LD
CFLAGS: $CFLAGS
CXXFLAGS: $CXXFLAGS
CPPFLAGS: $CPPFLAGS
Expand Down