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AC_DEFUN([PDNS_ENABLE_LTO],[
AC_ARG_ENABLE([lto],
AS_HELP_STRING([--enable-lto], [enable Link-Time Optimizations (LTO) support @<:@default=no@:>@]),
[enable_lto=$enableval],
[enable_lto=no]
)
AS_IF([test "x$enable_lto" != "xno"], [
dnl If thin is not supported, we try to fallback to auto
AS_IF([test "x$enable_lto" == "xthin"], [
gl_COMPILER_OPTION_IF([-flto=thin], [
CFLAGS="-flto=thin $CFLAGS"
CXXFLAGS="-flto=thin $CXXFLAGS"
LDFLAGS="-flto=thin $LDFLAGS"
], [enable_lto=auto])
])
dnl If auto is not supported, we try to fallback -flto
AS_IF([test "x$enable_lto" == "xauto"], [
gl_COMPILER_OPTION_IF([-flto=auto], [
CFLAGS="-flto=auto $CFLAGS"
CXXFLAGS="-flto=auto $CXXFLAGS"
LDFLAGS="-flto=auto $LDFLAGS"
], [enable_lto=yes])
])
AS_IF([test "x$enable_lto" == "xyes"], [
gl_COMPILER_OPTION_IF([-flto], [
CFLAGS="-flto $CFLAGS"
CXXFLAGS="-flto $CXXFLAGS"
LDFLAGS="-flto $LDFLAGS"
], [enable_lto=no])
])
])
AC_MSG_CHECKING([whether link-time optimization is supported])
AC_MSG_RESULT([$enable_lto])
])
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