lto-plugin/configure.ac

   1 AC_INIT([LTO plugin for ld], 0.1,,[lto-plugin])
   2 AC_CANONICAL_SYSTEM
   3 GCC_TOPLEV_SUBDIRS
   4 AM_INIT_AUTOMAKE([foreign no-dist])
   5 AM_MAINTAINER_MODE
   6 AC_ARG_WITH(libiberty,
   7   [AS_HELP_STRING([--with-libiberty=PATH],
   8     [specify the directory where to find libiberty [../libiberty]])],
   9   [], with_libiberty=../libiberty)
  10 AC_SUBST(with_libiberty)
  11 AC_USE_SYSTEM_EXTENSIONS
  12 AC_PROG_CC
  13 AC_SYS_LARGEFILE
  14 ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_lto_plugin_warn_cflags])
  15
  16 # Check whether -static-libgcc is supported.
  17 saved_LDFLAGS="$LDFLAGS"
  18 LDFLAGS="$LDFLAGS -static-libgcc"
  19 AC_MSG_CHECKING([for -static-libgcc])
  20 AC_LINK_IFELSE([AC_LANG_SOURCE([
  21   int main() {}])], [have_static_libgcc=yes], [have_static_libgcc=no])
  22 AC_MSG_RESULT($have_static_libgcc);
  23 LDFLAGS="$saved_LDFLAGS"
  24 # Need -Wc to get it through libtool.
  25 if test "x$have_static_libgcc" = xyes; then
  26    ac_lto_plugin_ldflags="-Wc,-static-libgcc"
  27 fi
  28
  29 # Enable --enable-host-bind-now
  30 AC_ARG_ENABLE(host-bind-now,
  31 [AS_HELP_STRING([--enable-host-bind-now],
  32        [link host code as BIND_NOW])])
  33 AC_SUBST(enable_host_bind_now)
  34
  35 if test x$enable_host_bind_now = xyes; then
  36   ac_lto_plugin_ldflags="$ac_lto_plugin_ldflags -Wl,-z,now"
  37 fi
  38
  39 AC_SUBST(ac_lto_plugin_ldflags)
  40
  41 GCC_CET_HOST_FLAGS(CET_HOST_FLAGS)
  42 AC_SUBST(CET_HOST_FLAGS)
  43
  44 if test x"$host_subdir" = x.; then
  45    gcc_build_dir=../gcc
  46 else
  47    gcc_build_dir=../../$host_subdir/gcc
  48 fi
  49 AC_SUBST(gcc_build_dir)
  50
  51 # Used for constructing correct paths for offload compilers.
  52 accel_dir_suffix=
  53 real_target_noncanonical=${target_noncanonical}
  54 if test x"$enable_as_accelerator_for" != x; then
  55   accel_dir_suffix=/accel/${target_noncanonical}
  56   real_target_noncanonical=${enable_as_accelerator_for}
  57 fi
  58 AC_SUBST(accel_dir_suffix)
  59 AC_SUBST(real_target_noncanonical)
  60
  61 # Determine what GCC version number to use in filesystem paths.
  62 GCC_BASE_VER
  63
  64 AC_MSG_CHECKING([whether symbol versioning is supported])
  65 lto_plugin_use_symver=no
  66 if test x$gcc_no_link = xyes; then
  67   # If we cannot link, we cannot build shared libraries, so do not use
  68   # symbol versioning.
  69   lto_plugin_use_symver=no
  70 else
  71   save_LDFLAGS="$LDFLAGS"
  72   LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
  73   cat > conftest.map <<EOF
  74 {
  75   global: *foo*; bar; local: *;
  76 };
  77 EOF
  78   AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=gnu],[lto_plugin_use_symver=no])
  79   if test x$lto_plugin_use_symver = xno; then
  80     case "$target_os" in
  81       solaris2*)
  82         LDFLAGS="$save_LDFLAGS"
  83         LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
  84         # Sun ld cannot handle wildcards and treats all entries as undefined.
  85         cat > conftest.map <<EOF
  86 {
  87   global: foo; local: *;
  88 };
  89 EOF
  90         AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=sun],[lto_plugin_use_symver=no])
  91           ;;
  92     esac
  93   fi
  94   LDFLAGS="$save_LDFLAGS"
  95 fi
  96 AC_MSG_RESULT($lto_plugin_use_symver)
  97 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER, [test "x$lto_plugin_use_symver" != xno])
  98 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_GNU, [test "x$lto_plugin_use_symver" = xgnu])
  99 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_SUN, [test "x$lto_plugin_use_symver" = xsun])
 100
 101 # Check for thread headers.
 102 use_locking=no
 103 ac_lto_plugin_extra_ldflags=
 104
 105 case $host in
 106   riscv*)
 107     # do not use locking as pthread depends on libatomic
 108     ;;
 109   *-linux*)
 110     use_locking=yes
 111     ;;
 112 esac
 113
 114 if test x$use_locking = xyes; then
 115   AC_CHECK_HEADER(pthread.h,
 116     [AC_DEFINE(HAVE_PTHREAD_LOCKING, 1, [Define if the system provides pthread locking mechanism.])])
 117
 118   ac_lto_plugin_extra_ldflags="-pthread"
 119 fi
 120
 121 AC_SUBST(ac_lto_plugin_extra_ldflags)
 122
 123 AM_PROG_LIBTOOL
 124 ACX_LT_HOST_FLAGS
 125 AC_SUBST(target_noncanonical)
 126 AC_TYPE_INT64_T
 127 AC_TYPE_UINT64_T
 128 AC_HEADER_SYS_WAIT
 129 AC_CONFIG_FILES(Makefile)
 130 AC_CONFIG_HEADERS(config.h)
 131 AC_OUTPUT