autoconf/configure.ac

   1 dnl Initialize autoconf
   2 AC_INIT([[[LLVM]]],[[[1.1]]],[llvmbugs@cs.uiuc.edu])
   3
   4 dnl Place all of the extra autoconf files into the config subdirectory
   5 AC_CONFIG_AUX_DIR([autoconf])
   6
   7 dnl Quit if the source directory has already been configured.
   8 dnl NOTE: This relies upon undocumented autoconf behavior.
   9 if test ${srcdir} != "."
  10 then
  11         if test -f ${srcdir}/include/Config/config.h
  12         then
  13                 AC_MSG_ERROR([Already configured in ${srcdir}])
  14         fi
  15 fi
  16
  17 dnl Configure all of the projects present in our source tree.
  18 for i in `ls ${srcdir}/projects`
  19 do
  20   if test ${i} != "CVS"
  21   then
  22     if test -f ${srcdir}/projects/${i}/configure
  23     then
  24       AC_CONFIG_SUBDIRS(projects/${i})
  25     fi
  26   fi
  27 done
  28
  29 dnl Configure a header file
  30 AC_CONFIG_HEADERS(include/Config/config.h)
  31 AC_CONFIG_MAKEFILE(Makefile)
  32 AC_CONFIG_MAKEFILE(Makefile.common)
  33 AC_CONFIG_MAKEFILE(lib/Makefile)
  34 AC_CONFIG_MAKEFILE(runtime/Makefile)
  35 AC_CONFIG_MAKEFILE(test/Makefile)
  36 AC_CONFIG_MAKEFILE(test/Makefile.tests)
  37 AC_CONFIG_MAKEFILE(test/QMTest/llvm.py)
  38 AC_CONFIG_MAKEFILE(test/QMTest/llvmdb.py)
  39 AC_CONFIG_MAKEFILE(test/Programs/Makefile)
  40 AC_CONFIG_MAKEFILE(test/Programs/Makefile.programs)
  41 AC_CONFIG_MAKEFILE(test/Programs/TEST.aa.Makefile)
  42 AC_CONFIG_MAKEFILE(test/Programs/TEST.dsgraph.report)
  43 AC_CONFIG_MAKEFILE(test/Programs/TEST.micro.report)
  44 AC_CONFIG_MAKEFILE(test/Programs/TEST.aa.report)
  45 AC_CONFIG_MAKEFILE(test/Programs/TEST.example.Makefile)
  46 AC_CONFIG_MAKEFILE(test/Programs/TEST.nightly.Makefile)
  47 AC_CONFIG_MAKEFILE(test/Programs/TEST.buildrepo.Makefile)
  48 AC_CONFIG_MAKEFILE(test/Programs/TEST.jit.Makefile)
  49 AC_CONFIG_MAKEFILE(test/Programs/TEST.nightly.report)
  50 AC_CONFIG_MAKEFILE(test/Programs/TEST.dsgraph.Makefile)
  51 AC_CONFIG_MAKEFILE(test/Programs/TEST.jit.report)
  52 AC_CONFIG_MAKEFILE(test/Programs/TEST.typesafe.Makefile)
  53 AC_CONFIG_MAKEFILE(test/Programs/TEST.dsgraph.gnuplot)
  54 AC_CONFIG_MAKEFILE(test/Programs/TEST.micro.Makefile)
  55 AC_CONFIG_MAKEFILE(test/Programs/TEST.vtl.Makefile)
  56 AC_CONFIG_MAKEFILE(test/Programs/External/Makefile)
  57 AC_CONFIG_MAKEFILE(test/Programs/External/SPEC/Makefile)
  58 AC_CONFIG_MAKEFILE(test/Programs/External/SPEC/Makefile.spec)
  59 AC_CONFIG_MAKEFILE(test/Programs/External/SPEC/Makefile.spec95)
  60 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Makefile)
  61 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Makefile.multisrc)
  62 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/analyzer/test.in)
  63 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/distray/Makefile)
  64 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/distray/test.in)
  65 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/fourinarow/Makefile)
  66 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/fourinarow/test.in)
  67 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/mason/Makefile)
  68 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/mason/test.in)
  69 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/neural/Makefile)
  70 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/neural/test.in)
  71 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/pcompress2/Makefile)
  72 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/pcompress2/test.in)
  73 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/pifft/Makefile)
  74 AC_CONFIG_MAKEFILE(test/Programs/MultiSource/Benchmarks/FreeBench/pifft/test.in)
  75 AC_CONFIG_MAKEFILE(test/Programs/SingleSource/Makefile)
  76 AC_CONFIG_MAKEFILE(test/Programs/SingleSource/Makefile.singlesrc)
  77 AC_CONFIG_MAKEFILE(tools/Makefile)
  78 AC_CONFIG_MAKEFILE(utils/Makefile)
  79 AC_CONFIG_MAKEFILE(projects/Makefile)
  80
  81 dnl Find the install program (needs to be done before canonical stuff)
  82 AC_PROG_INSTALL
  83
  84 dnl Check which host for which we're compiling.  This will tell us which LLVM
  85 dnl compiler will be used for compiling SSA into object code.
  86 AC_CANONICAL_TARGET
  87
  88 dnl Set the "OS" Makefile variable based on the system we are building on.
  89 dnl We will use the build machine information to set some variables.
  90 case $build in
  91         *-*-linux*)
  92              AC_SUBST(OS,[Linux])
  93                          if test -d /home/vadve/lattner/local/x86/llvm-gcc
  94                          then
  95                            AC_SUBST(LLVMGCCDIR,[/home/vadve/lattner/local/x86/llvm-gcc/])
  96                          fi
  97                  ;;
  98
  99         *-*-solaris*)
 100              AC_SUBST(OS,[SunOS])
 101                          if test -d /home/vadve/lattner/local/sparc/llvm-gcc
 102                          then
 103                    AC_SUBST(LLVMGCCDIR,[/home/vadve/lattner/local/sparc/llvm-gcc/])
 104                          fi
 105                  ;;
 106
 107         *-*-darwin*)
 108              AC_SUBST(OS,[Darwin])
 109                  ;;
 110
 111         *)       AC_SUBST(OS,[Unknown])
 112                  ;;
 113 esac
 114
 115 dnl If we are targetting a Sparc machine running Solaris, pretend that it is
 116 dnl V9, since that is all that we support at the moment, and autoconf will only
 117 dnl tell us we're a sparc.
 118 case $target in
 119         sparc*-*-solaris*)  AC_SUBST(target,[[sparcv9-sun-solaris2.8]])
 120                             ;;
 121 esac
 122
 123 dnl Determine what our target architecture is and configure accordingly.
 124 dnl This will allow Makefiles to make a distinction between the hardware and
 125 dnl the OS.
 126 case $target in
 127         i*86-*)           AC_SUBST(ARCH,[x86])
 128                           ;;
 129         sparc*-*)         AC_SUBST(ARCH,[Sparc])
 130                           ;;
 131         powerpc*-*)       AC_SUBST(ARCH,[PowerPC])
 132                           ;;
 133         *)                AC_SUBST(ARCH,[Unknown])
 134                           ;;
 135 esac
 136
 137 dnl Check for compilation tools
 138 AC_PROG_CXX
 139 AC_PROG_CC(gcc)
 140 AC_PROG_CPP
 141
 142 dnl Ensure that compilation tools are GCC; we use GCC specific extensions
 143 if test "$GCC" != "yes"
 144 then
 145         AC_MSG_ERROR([gcc required but not found])
 146 fi
 147 if test "$GXX" != "yes"
 148 then
 149         AC_MSG_ERROR([g++ required but not found])
 150 fi
 151
 152 dnl Verify that GCC is version 3.0 or higher
 153 gccmajor=`$CC --version | head -n 1 | awk '{print $NF;}' | cut -d. -f1`
 154 if test "$gccmajor" -lt "3"
 155 then
 156         AC_MSG_ERROR([gcc 3.x required, but you have a lower version])
 157 fi
 158
 159 dnl Check for GNU Make.  We use its extensions too, so don't build without it
 160 CHECK_GNU_MAKE
 161 if test -z "$_cv_gnu_make_command"
 162 then
 163         AC_MSG_ERROR([GNU Make required but not found])
 164 fi
 165
 166 dnl Checks for other tools
 167 AC_PROG_FLEX
 168 AC_PROG_BISON
 169 AC_PROG_LIBTOOL
 170
 171 dnl Checks for tools we can get away with not having:
 172 AC_PATH_PROG(DOT,[dot],[true dot])
 173 AC_PATH_PROG(ETAGS,[etags],[true etags])
 174 dnl Check if we know how to tell etags we are using C++:
 175 etags_version=`$ETAGS --version 2>&1`
 176 case "$etags_version" in
 177         *[Ee]xuberant*) ETAGSFLAGS="--language-force=c++" ;;
 178         *GNU\ Emacs*) ETAGSFLAGS="-l c++" ;;
 179         *) ETAGSFLAGS="" ;;
 180 esac
 181 AC_SUBST(ETAGSFLAGS,$ETAGSFLAGS)
 182 AC_PATH_PROG(PYTHON,[python],[true python])
 183 if test "$PYTHON" = "false"
 184 then
 185         AC_MSG_WARN([Python is required for the test suite, but it was not found])
 186 fi
 187 AC_PATH_PROG(QMTEST,[qmtest],[true qmtest])
 188 if test "$QMTEST" = "false"
 189 then
 190         AC_MSG_WARN([QMTest is required for the test suite, but it was not found])
 191 fi
 192
 193 dnl Verify that the version of python available is high enough for qmtest
 194 pyversion=`$PYTHON -V 2>&1 | cut -d\  -f2`
 195 pymajor=`echo $pyversion | cut -d. -f1`
 196 pyminor=`echo $pyversion | cut -d. -f2`
 197
 198 if test "$pymajor" -ge "2"
 199 then
 200         if test "$pymajor" -eq "2"
 201         then
 202                 if test "$pyminor" -lt "2"
 203                 then
 204                         AC_MSG_WARN([QMTest requires Python 2.2 or later])
 205                 fi
 206         fi
 207 else
 208         AC_MSG_WARN([QMTest requires Python 2.2 or later])
 209 fi
 210
 211 dnl Verify that the source directory is valid
 212 AC_CONFIG_SRCDIR(["Makefile.config.in"])
 213
 214 dnl Checks for libraries:
 215 dnl libelf is for sparc only; we can ignore it if we don't have it
 216 AC_CHECK_LIB(elf, elf_begin)
 217
 218 dnl dlopen() is required for plugin support.
 219 AC_SEARCH_LIBS(dlopen,dl,AC_DEFINE([HAVE_DLOPEN],[1],[Define if dlopen() is available on this platform.]),AC_MSG_WARN([dlopen() not found - disabling plugin support]))
 220
 221 dnl mallinfo is optional; the code can compile (minus features) without it
 222 AC_SEARCH_LIBS(mallinfo,malloc,AC_DEFINE([HAVE_MALLINFO],[1],[Define if mallinfo() is available on this platform.]))
 223
 224 dnl pthread locking functions are optional - but llvm will not be thread-safe
 225 dnl without locks.
 226 AC_SEARCH_LIBS(pthread_mutex_lock,pthread,HAVE_PTHREAD_MUTEX_LOCK=1,HAVE_PTHREAD_MUTEX_LOCK=0)
 227 AC_SUBST(HAVE_PTHREAD_MUTEX_LOCK)
 228
 229 dnl Checks for header files.
 230 dnl We don't check for ancient stuff or things that are guaranteed to be there
 231 dnl by the C++ standard. We always use the <cfoo> versions of <foo.h> C headers.
 232 AC_HEADER_STDC
 233 AC_HEADER_SYS_WAIT
 234
 235 dnl Checks for POSIX and other various system-specific header files
 236 AC_CHECK_HEADERS(fcntl.h limits.h sys/time.h unistd.h malloc.h sys/mman.h sys/resource.h dlfcn.h link.h execinfo.h)
 237
 238 dnl Check for things that need to be included in public headers, and so
 239 dnl for which we may not have access to a HAVE_* preprocessor #define.
 240 dnl (primarily used in DataTypes.h)
 241 AC_CHECK_HEADER([sys/types.h],
 242                 [INCLUDE_SYS_TYPES_H='#include <sys/types.h>'],
 243                 [INCLUDE_SYS_TYPES_H=''])
 244 AC_SUBST(INCLUDE_SYS_TYPES_H)
 245 AC_CHECK_HEADER([inttypes.h],
 246                 [INCLUDE_INTTYPES_H='#include <inttypes.h>'],
 247                 [INCLUDE_INTTYPES_H=''])
 248 AC_SUBST(INCLUDE_INTTYPES_H)
 249
 250 dnl Check for types
 251 AC_TYPE_PID_T
 252 AC_TYPE_SIZE_T
 253 AC_CHECK_TYPES([int64_t],,AC_MSG_ERROR([Type int64_t required but not found]))
 254 AC_CHECK_TYPES([uint64_t],,AC_MSG_ERROR([Type uint64_t required but not found]))
 255 AC_HEADER_TIME
 256 AC_STRUCT_TM
 257
 258 dnl Check for various C features
 259 AC_C_PRINTF_A
 260
 261 dnl Check for the endianness of the target
 262 AC_C_BIGENDIAN(AC_SUBST([ENDIAN],[big]),AC_SUBST([ENDIAN],[little]))
 263
 264 dnl Check for C++ extensions
 265 AC_CXX_HAVE_HASH_MAP
 266 AC_CXX_HAVE_HASH_SET
 267 AC_CXX_HAVE_STD_ITERATOR
 268 AC_CXX_HAVE_BI_ITERATOR
 269 AC_CXX_HAVE_FWD_ITERATOR
 270
 271 dnl Checks for library functions.
 272 AC_FUNC_ALLOCA
 273 AC_FUNC_MMAP
 274 if test "$ac_cv_func_mmap_fixed_mapped" = "no"
 275 then
 276         AC_MSG_ERROR([mmap() required but not found])
 277 fi
 278 AC_FUNC_MMAP_FILE
 279 if test "$ac_cv_func_mmap_file" = "no"
 280 then
 281         AC_MSG_ERROR([mmap() of files required but not found])
 282 fi
 283 AC_HEADER_MMAP_ANONYMOUS
 284 AC_TYPE_SIGNAL
 285 AC_CHECK_FUNCS(getcwd gettimeofday strdup strtoq strtoll backtrace)
 286 AC_CHECK_FUNC(mprotect,,AC_MSG_ERROR([Function mprotect() required but not found]))
 287
 288 dnl Determine if the linker supports the -R option.
 289 AC_LINK_USE_R
 290
 291 dnl --enable/--with command-line options:
 292 dnl Check whether they want to do an optimized build:
 293 AC_ARG_ENABLE(optimized,AC_HELP_STRING([--enable-optimized],[Compile with optimizations enabled (default is NO)]),,enableval=no)
 294 if test ${enableval} = "no"
 295 then
 296         AC_SUBST(ENABLE_OPTIMIZED,[[]])
 297 else
 298         AC_SUBST(ENABLE_OPTIMIZED,[[ENABLE_OPTIMIZED=1]])
 299 fi
 300
 301 dnl Spec 2000 Benchmarks
 302 AC_ARG_ENABLE(spec2000,AC_HELP_STRING([--enable-spec2000],[Compile SPEC 2000 benchmarks (default is NO)]),,enableval=no)
 303 if test ${enableval} = "no"
 304 then
 305         if test -d /home/vadve/shared/benchmarks/speccpu2000/benchspec
 306         then
 307                 AC_SUBST(SPEC2000_ROOT,[/home/vadve/shared/benchmarks/speccpu2000/benchspec])
 308                 AC_SUBST(USE_SPEC2000,[[USE_SPEC2000=1]])
 309         else
 310                 AC_SUBST(USE_SPEC2000,[[]])
 311                 AC_SUBST(SPEC2000_ROOT,[])
 312         fi
 313 else
 314         if test ${enableval} = ""
 315         then
 316                 AC_SUBST(SPEC2000_ROOT,[/home/vadve/shared/benchmarks/speccpu2000/benchspec])
 317         else
 318                 AC_SUBST(SPEC2000_ROOT,[${enableval}])
 319         fi
 320         AC_SUBST(USE_SPEC2000,[[USE_SPEC2000=1]])
 321 fi
 322
 323 dnl Spec 95 Benchmarks
 324 AC_ARG_ENABLE(spec95,AC_HELP_STRING([--enable-spec95],[Compile SPEC 95 benchmarks (default is NO)]),,enableval=no)
 325 if test ${enableval} = "no"
 326 then
 327         if test -d /home/vadve/shared/benchmarks/spec95/benchspec
 328         then
 329                 AC_SUBST(SPEC95_ROOT,[/home/vadve/shared/benchmarks/spec95/benchspec])
 330                 AC_SUBST(USE_SPEC95,[[USE_SPEC95=1]])
 331         else
 332                 AC_SUBST(USE_SPEC95,[[]])
 333                 AC_SUBST(SPEC95_ROOT,[])
 334         fi
 335 else
 336         if test ${enableval} = ""
 337         then
 338                 AC_SUBST(SPEC95_ROOT,[/home/vadve/shared/benchmarks/spec95/benchspec])
 339         else
 340                 AC_SUBST(SPEC95_ROOT,[${enableval}])
 341         fi
 342         AC_SUBST(USE_SPEC95,[[USE_SPEC95=1]])
 343 fi
 344
 345 dnl Povray External Benchmark
 346 AC_ARG_ENABLE(povray,AC_HELP_STRING([--enable-povray],[Compile Povray benchmark (default is NO)]),,enableval=no)
 347 if test ${enableval} = "no"
 348 then
 349         if test -d /home/vadve/criswell/Downloads/povray-3.50c
 350         then
 351                 AC_SUBST(POVRAY_ROOT,[/home/vadve/criswell/Downloads/povray-3.50c])
 352                 AC_SUBST(USE_POVRAY,[[USE_POVRAY=1]])
 353         else
 354                 AC_SUBST(USE_POVRAY,[[]])
 355                 AC_SUBST(POVRAY_ROOT,[])
 356         fi
 357 else
 358         if test ${enableval} = ""
 359         then
 360                 AC_SUBST(POVRAY_ROOT,[/home/vadve/criswell/Downloads/povray-3.50c])
 361         else
 362                 AC_SUBST(POVRAY_ROOT,[${enableval}])
 363         fi
 364         AC_SUBST(USE_POVRAY,[[USE_POVRAY=1]])
 365 fi
 366
 367
 368 dnl Precompiled Bytecode Option
 369 AC_ARG_ENABLE(precompiled_bytecode,AC_HELP_STRING([--enable-precompiled_bytecode],[Use pre-compiled bytecode (default is NO)]),,enableval=no)
 370 if test ${enableval} = "no"
 371 then
 372         AC_SUBST(UPB,[[]])
 373 else
 374         AC_SUBST(UPB,[[USE_PRECOMPILED_BYTECODE=1]])
 375 fi
 376
 377 dnl LLC Diff Option
 378 AC_ARG_ENABLE(llc_diffs,AC_HELP_STRING([--enable-llc_diffs],[Enable LLC Diffs when testing (default is YES)]),,enableval=yes)
 379 if test ${enableval} = "no"
 380 then
 381         AC_SUBST(DISABLE_LLC_DIFFS,[DISABLE_LLC_DIFFS:=1])
 382 else
 383         AC_SUBST(DISABLE_LLC_DIFFS,[[]])
 384 fi
 385
 386 dnl JIT Option
 387 AC_ARG_ENABLE(jit,AC_HELP_STRING([--enable-jit],[Enable Just In Time Compiling (default is YES)]),,enableval=default)
 388 if test ${enableval} = "no"
 389 then
 390         AC_SUBST(JIT,[[]])
 391 else
 392         case $target in
 393                 *i*86*)
 394                         AC_SUBST(JIT,[[TARGET_HAS_JIT=1]])
 395                         ;;
 396                 *sparc*)
 397                         AC_SUBST(JIT,[[TARGET_HAS_JIT=1]])
 398                         ;;
 399                 *)
 400                         AC_SUBST(JIT,[[]])
 401                         ;;
 402         esac
 403 fi
 404
 405 dnl Find the LLVM GCC-based C/C++ front end
 406 AC_ARG_WITH(llvmgccdir,AC_HELP_STRING([--with-llvmgccdir],[Location of LLVM GCC front-end]),AC_SUBST(LLVMGCCDIR,[$withval]))
 407 AC_MSG_CHECKING([for llvm-gcc])
 408 LLVM_GCC_CHECK=no
 409 if test -d "$LLVMGCCDIR"
 410 then
 411         if test -x "$LLVMGCCDIR/bin/gcc"
 412         then
 413                 LLVM_GCC_CHECK="$LLVMGCCDIR/bin/gcc"
 414         fi
 415 fi
 416 llvmgccwarn=no
 417 AC_MSG_RESULT($LLVM_GCC_CHECK)
 418 if test "$LLVM_GCC_CHECK" = "no"
 419 then
 420     llvmgccwarn=yes
 421 fi
 422 AC_MSG_CHECKING([whether llvm-gcc is sane])
 423 LLVM_GCC_SANE=no
 424 if test -x "$LLVM_GCC_CHECK"
 425 then
 426         cp /dev/null conftest.c
 427     "$LLVM_GCC_CHECK" -S -o - conftest.c | grep implementation > /dev/null 2>&1
 428         if test $? -eq 0
 429         then
 430                 LLVM_GCC_SANE=yes
 431         fi
 432         rm conftest.c
 433         llvmcc1path=`"$LLVM_GCC_CHECK" --print-prog-name=cc1`
 434         AC_SUBST(LLVMCC1,$llvmcc1path)
 435         llvmcc1pluspath=`"$LLVM_GCC_CHECK" --print-prog-name=cc1plus`
 436         AC_SUBST(LLVMCC1PLUS,$llvmcc1pluspath)
 437 fi
 438 AC_MSG_RESULT($LLVM_GCC_SANE)
 439 if test "$LLVM_GCC_SANE" = "no"
 440 then
 441         llvmgccwarn=yes
 442 fi
 443
 444 dnl Location of the bytecode repository
 445 AC_ARG_WITH(bcrepos,AC_HELP_STRING([--with-bcrepos],[Location of Bytecode Repository]),AC_SUBST(BCR,[$withval]),AC_SUBST(BCR,[/home/vadve/lattner/LLVMPrograms]))
 446
 447 dnl Location of PAPI
 448 AC_ARG_WITH(papi,AC_HELP_STRING([--with-papi],[Location of PAPI]),AC_SUBST(PAPIDIR,[$withval]),AC_SUBST(PAPIDIR,[/home/vadve/shared/Sparc/papi-2.3.4.1]))
 449
 450 dnl Get libtool's idea of what the shared library suffix is.
 451 dnl (This is a hack; it relies on undocumented behavior.)
 452 AC_MSG_CHECKING([for shared library suffix])
 453 eval "SHLIBEXT=$shrext"
 454 AC_MSG_RESULT($SHLIBEXT)
 455 dnl Propagate it to the Makefiles and config.h (for gccld & bugpoint).
 456 AC_SUBST(SHLIBEXT,$SHLIBEXT)
 457 AC_DEFINE_UNQUOTED(SHLIBEXT,"$SHLIBEXT",
 458                    [Extension that shared libraries have, e.g., ".so".])
 459
 460 dnl Create the output files
 461 AC_OUTPUT(Makefile.config
 462  include/Support/DataTypes.h
 463  include/Support/ThreadSupport.h
 464  include/Support/hash_map
 465  include/Support/hash_set
 466  include/Support/iterator)
 467
 468 dnl Warn loudly if llvm-gcc was not obviously working
 469 if test $llvmgccwarn = yes
 470 then
 471         AC_MSG_WARN([***** llvm C/C++ front end was not found, or does not])
 472         AC_MSG_WARN([***** appear to be working.])
 473         AC_MSG_WARN([***** ])
 474         AC_MSG_WARN([***** Please check configure's --with-llvmgccdir option.])
 475         AC_MSG_WARN([***** Runtime libraries (in llvm/runtime) will not be built,])
 476         AC_MSG_WARN([***** but you should be able to build the llvm tools.])
 477 fi
 478