diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/configure.ac b/configure.ac index 6d3390a..507ab54 100644 --- a/configure.ac +++ b/configure.ac @@ -1651,17 +1651,8 @@ AC_ARG_ENABLE(lto, enable_lto=$enableval, enable_lto=yes; default_enable_lto=yes) -ACX_ELF_TARGET_IFELSE([], -if test x"$default_enable_lto" = x"yes" ; then - enable_lto=no -else - if test x"$enable_lto" = x"yes"; then - AC_MSG_ERROR([LTO support requires an ELF target.]) - fi -fi -default_enable_lto=no) -if test x"$enable_lto" = x"yes" ; then +ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then # Make sure that libelf.h and gelf.h are available. AC_ARG_WITH(libelf, [ --with-libelf=PATH Specify prefix directory for the installed libelf package Equivalent to --with-libelf-include=PATH/include @@ -1777,7 +1768,25 @@ to specify its location.]) # Flags needed for libelf. AC_SUBST(libelflibs) AC_SUBST(libelfinc) -fi +fi],[if test x"$default_enable_lto" = x"yes" ; then + # On non-ELF platforms, LTO must be explicitly enabled. + enable_lto=no + else + # Apart from ELF platforms, only Windows supports LTO so far. It + # would also be nice to check the binutils support, but we don't + # have gcc_GAS_CHECK_FEATURE available here. For now, we'll just + # warn during gcc/ subconfigure; unless you're bootstrapping with + # -flto it won't be needed until after installation anyway. + case $target in + *-cygwin*|*-mingw*) ;; + *-apple-darwin*) ;; + *) if test x"$enable_lto" = x"yes"; then + AC_MSG_ERROR([LTO support is not enabled for this target.]) + fi + ;; + esac + fi + default_enable_lto=no]) # By default, C is the only stage 1 language. |