AC_INIT([LTO plugin for ld], 0.1,,[lto-plugin])
AC_CANONICAL_SYSTEM
GCC_TOPLEV_SUBDIRS
AM_INIT_AUTOMAKE([foreign no-dist])
AM_MAINTAINER_MODE
AC_ARG_WITH(libiberty,
[AS_HELP_STRING([--with-libiberty=PATH],
[specify the directory where to find libiberty [../libiberty]])],
[], with_libiberty=../libiberty)
AC_SUBST(with_libiberty)
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
AC_SYS_LARGEFILE
ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_lto_plugin_warn_cflags])
# Check whether -static-libgcc is supported.
saved_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -static-libgcc"
AC_MSG_CHECKING([for -static-libgcc])
AC_LINK_IFELSE([AC_LANG_SOURCE([
int main() {}])], [have_static_libgcc=yes], [have_static_libgcc=no])
AC_MSG_RESULT($have_static_libgcc);
LDFLAGS="$saved_LDFLAGS"
# Need -Wc to get it through libtool.
if test "x$have_static_libgcc" = xyes; then
ac_lto_plugin_ldflags="-Wc,-static-libgcc"
fi
if test x"$host_subdir" = x.; then
gcc_build_dir=../gcc
else
gcc_build_dir=../../$host_subdir/gcc
fi
AC_SUBST(gcc_build_dir)
# Used for constructing correct paths for offload compilers.
accel_dir_suffix=
real_target_noncanonical=${target_noncanonical}
if test x"$enable_as_accelerator_for" != x; then
accel_dir_suffix=/accel/${target_noncanonical}
real_target_noncanonical=${enable_as_accelerator_for}
fi
AC_SUBST(accel_dir_suffix)
AC_SUBST(real_target_noncanonical)
# Determine what GCC version number to use in filesystem paths.
GCC_BASE_VER
AC_MSG_CHECKING([whether symbol versioning is supported])
lto_plugin_use_symver=no
if test x$gcc_no_link = xyes; then
# If we cannot link, we cannot build shared libraries, so do not use
# symbol versioning.
lto_plugin_use_symver=no
else
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
cat > conftest.map <<EOF
{
global: *foo*; bar; local: *;
};
EOF
AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=gnu],[lto_plugin_use_symver=no])
if test x$lto_plugin_use_symver = xno; then
case "$target_os" in
solaris2*)
LDFLAGS="$save_LDFLAGS"
LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
# Sun ld cannot handle wildcards and treats all entries as undefined.
cat > conftest.map <<EOF
{
global: foo; local: *;
};
EOF
AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=sun],[lto_plugin_use_symver=no])
;;
esac
fi
LDFLAGS="$save_LDFLAGS"
fi
AC_MSG_RESULT($lto_plugin_use_symver)
AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER, [test "x$lto_plugin_use_symver" != xno])
AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_GNU, [test "x$lto_plugin_use_symver" = xgnu])
AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_SUN, [test "x$lto_plugin_use_symver" = xsun])
# Check for thread headers.
use_locking=no
ac_lto_plugin_extra_ldflags=
case $host in
riscv*)
# do not use locking as pthread depends on libatomic
;;
*-linux*)
use_locking=yes
;;
esac
if test x$use_locking = xyes; then
AC_CHECK_HEADER(pthread.h,
[AC_DEFINE(HAVE_PTHREAD_LOCKING, 1, [Define if the system provides pthread locking mechanism.])])
