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$have_static_libgcc" = xyes; then
  26    ac_lto_plugin_ldflags="-Wc,-static-libgcc"
  27 fi
  28 AC_SUBST(ac_lto_plugin_ldflags)
  29
  30 GCC_CET_HOST_FLAGS(CET_HOST_FLAGS)
  31 AC_SUBST(CET_HOST_FLAGS)
  32
  33 if test x"$host_subdir" = x.; then
  34    gcc_build_dir=../gcc
  35 else
  36    gcc_build_dir=../../$host_subdir/gcc
  37 fi
  38 AC_SUBST(gcc_build_dir)
  39
  40 # Used for constructing correct paths for offload compilers.
  41 accel_dir_suffix=
  42 real_target_noncanonical=${target_noncanonical}
  43 if test x"$enable_as_accelerator_for" != x; then
  44   accel_dir_suffix=/accel/${target_noncanonical}
  45   real_target_noncanonical=${enable_as_accelerator_for}
  46 fi
  47 AC_SUBST(accel_dir_suffix)
  48 AC_SUBST(real_target_noncanonical)
  49
  50 # Determine what GCC version number to use in filesystem paths.
  51 GCC_BASE_VER
  52
  53 AC_MSG_CHECKING([whether symbol versioning is supported])
  54 lto_plugin_use_symver=no
  55 if test x$gcc_no_link = xyes; then
  56   # If we cannot link, we cannot build shared libraries, so do not use
  57   # symbol versioning.
  58   lto_plugin_use_symver=no
  59 else
  60   save_LDFLAGS="$LDFLAGS"
  61   LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
  62   cat > conftest.map <<EOF
  63 {
  64   global: *foo*; bar; local: *;
  65 };
  66 EOF
  67   AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=gnu],[lto_plugin_use_symver=no])
  68   if test x$lto_plugin_use_symver = xno; then
  69     case "$target_os" in
  70       solaris2*)
  71         LDFLAGS="$save_LDFLAGS"
  72         LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
  73         # Sun ld cannot handle wildcards and treats all entries as undefined.
  74         cat > conftest.map <<EOF
  75 {
  76   global: foo; local: *;
  77 };
  78 EOF
  79         AC_TRY_LINK([int foo;],[],[lto_plugin_use_symver=sun],[lto_plugin_use_symver=no])
  80           ;;
  81     esac
  82   fi
  83   LDFLAGS="$save_LDFLAGS"
  84 fi
  85 AC_MSG_RESULT($lto_plugin_use_symver)
  86 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER, [test "x$lto_plugin_use_symver" != xno])
  87 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_GNU, [test "x$lto_plugin_use_symver" = xgnu])
  88 AM_CONDITIONAL(LTO_PLUGIN_USE_SYMVER_SUN, [test "x$lto_plugin_use_symver" = xsun])
  89
  90 # Check for thread headers.
  91 use_locking=no
  92 ac_lto_plugin_extra_ldflags=
  93
  94 case $host in
  95   riscv*)
  96     # do not use locking as pthread depends on libatomic
  97     ;;
  98   *-linux*)
  99     use_locking=yes
 100     ;;
 101 esac
 102
 103 if test x$use_locking = xyes; then
 104   AC_CHECK_HEADER(pthread.h,
 105     [AC_DEFINE(HAVE_PTHREAD_LOCKING, 1, [Define if the system provides pthread locking mechanism.])])
 106
 107   ac_lto_plugin_extra_ldflags="-pthread"
 108 fi
 109
 110 AC_SUBST(ac_lto_plugin_extra_ldflags)
 111
 112 AM_PROG_LIBTOOL
 113 ACX_LT_HOST_FLAGS
 114 AC_SUBST(target_noncanonical)
 115 AC_TYPE_INT64_T
 116 AC_TYPE_UINT64_T
 117 AC_HEADER_SYS_WAIT
 118 AC_CONFIG_FILES(Makefile)
 119 AC_CONFIG_HEADERS(config.h)
 120 AC_OUTPUT