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configure: Add --enable-lto for explicit toggle of -flto.

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This commit is contained in:
Jason Volk 2019-01-22 13:13:36 -08:00
parent 706563195e
commit 74612e9474
1 changed files with 30 additions and 6 deletions
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36
configure.ac
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@ -227,6 +227,26 @@ AC_ARG_ENABLE(optimize, AC_HELP_STRING([--enable-optimize], [Enable optimization
AM_CONDITIONAL([OPTIMIZE], [[[[ "$OPTIMIZE" = "1" ]]]])
dnl
dnl Explicit link-time-optimization switch
dnl
AC_MSG_CHECKING(whether to enable link-time optimization)
AC_ARG_ENABLE(lto, AC_HELP_STRING([--enable-lto], [Enable link-time optimization]),
[
AC_MSG_RESULT([yes])
AC_SUBST(LTO, 1)
], [
AM_COND_IF(DEBUG,
[
AC_MSG_RESULT([no])
], [
AC_MSG_RESULT([no, link-time optimization is explicit-only at this time])
])
])
AM_CONDITIONAL([LTO], [[[[ "$LTO" = "1" ]]]])
dnl
dnl Explicit optimization level switch
dnl
@ -399,6 +419,14 @@ dnl
CXXFLAGS+=" -O$optimize_level"
AM_COND_IF([LTO],
[
lto="yes"
CXXFLAGS+=" -flto"
], [
lto="no"
])
AM_COND_IF([OPTIMIZE],
[
CXXFLAGS+=" -fweb"
@ -413,14 +441,9 @@ AM_COND_IF([OPTIMIZE],
CXXFLAGS+=" -fira-hoist-pressure"
CXXFLAGS+=" -fbranch-target-load-optimize"
CXXFLAGS+=" -frerun-loop-opt"
dnl TODO: lto cannot be enabled until subobject linkage for json::tuple
dnl is resolved
dnl
dnl CXXFLAGS+=" -flto"
CXXFLAGS+=" -fdevirtualize-at-ltrans"
dnl remember to axe this when lto is enabled
dnl Note these flags are unreliable with LTO
CXXFLAGS+=" -g"
CXXFLAGS+=" -ggdb"
], [
@ -1488,6 +1511,7 @@ echo "Precompiled headers ............... $build_pch"
echo "Developer debug ................... $debug"
echo "Developer assert .................. $assert"
echo "Optimized build ................... $optimize"
echo "Link-time optimized ............... $lto"
echo "Optimization level ................ $optimize_level"
echo "Generic binary .................... $enable_generic"
echo "Logging level ..................... $LOG_LEVEL"