1 #
   2 # Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
   3 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4 #
   5 # This code is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License version 2 only, as
   7 # published by the Free Software Foundation.  Oracle designates this
   8 # particular file as subject to the "Classpath" exception as provided
   9 # by Oracle in the LICENSE file that accompanied this code.
  10 #
  11 # This code is distributed in the hope that it will be useful, but WITHOUT
  12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 # version 2 for more details (a copy is included in the LICENSE file that
  15 # accompanied this code).
  16 #
  17 # You should have received a copy of the GNU General Public License version
  18 # 2 along with this work; if not, write to the Free Software Foundation,
  19 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20 #
  21 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22 # or visit www.oracle.com if you need additional information or have any
  23 # questions.
  24 #
  25 
  26 AC_DEFUN_ONCE([FLAGS_SETUP_INIT_FLAGS],
  27 [
  28   # Option used to tell the compiler whether to create 32- or 64-bit executables
  29   if test "x$TOOLCHAIN_TYPE" = xxlc; then
  30     COMPILER_TARGET_BITS_FLAG="-q"
  31   else
  32     COMPILER_TARGET_BITS_FLAG="-m"
  33   fi
  34   AC_SUBST(COMPILER_TARGET_BITS_FLAG)
  35 
  36   # FIXME: figure out if we should select AR flags depending on OS or toolchain.
  37   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
  38     ARFLAGS="-r"
  39   elif test "x$OPENJDK_TARGET_OS" = xaix; then
  40     ARFLAGS="-X64"
  41   elif test "x$OPENJDK_TARGET_OS" = xwindows; then
  42     # lib.exe is used as AR to create static libraries.
  43     ARFLAGS="-nologo -NODEFAULTLIB:MSVCRT"
  44   else
  45     ARFLAGS=""
  46   fi
  47   AC_SUBST(ARFLAGS)
  48 
  49   ## Setup strip.
  50   # FIXME: should this really be per platform, or should it be per toolchain type?
  51   # strip is not provided by clang or solstudio; so guessing platform makes most sense.
  52   # FIXME: we should really only export STRIPFLAGS from here, not POST_STRIP_CMD.
  53   if test "x$OPENJDK_TARGET_OS" = xlinux; then
  54     STRIPFLAGS="-g"
  55   elif test "x$OPENJDK_TARGET_OS" = xsolaris; then
  56     STRIPFLAGS="-x"
  57   elif test "x$OPENJDK_TARGET_OS" = xmacosx; then
  58     STRIPFLAGS="-S"
  59   elif test "x$OPENJDK_TARGET_OS" = xaix; then
  60     STRIPFLAGS="-X32_64"
  61   fi
  62 
  63   if test "x$OPENJDK_TARGET_OS" != xwindows; then
  64     POST_STRIP_CMD="$STRIP $STRIPFLAGS"
  65   fi
  66   AC_SUBST(POST_STRIP_CMD)
  67 
  68   if test "x$OPENJDK_TARGET_OS" = xsolaris; then
  69     # FIXME: break out into MCSFLAGS
  70     POST_MCS_CMD="$MCS -d -a \"JDK $FULL_VERSION\""
  71   fi
  72   AC_SUBST(POST_MCS_CMD)
  73 
  74   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
  75     CC_OUT_OPTION=-Fo
  76     EXE_OUT_OPTION=-out:
  77     LD_OUT_OPTION=-out:
  78     AR_OUT_OPTION=-out:
  79   else
  80     # The option used to specify the target .o,.a or .so file.
  81     # When compiling, how to specify the to be created object file.
  82     CC_OUT_OPTION='-o$(SPACE)'
  83     # When linking, how to specify the to be created executable.
  84     EXE_OUT_OPTION='-o$(SPACE)'
  85     # When linking, how to specify the to be created dynamically linkable library.
  86     LD_OUT_OPTION='-o$(SPACE)'
  87     # When archiving, how to specify the to be create static archive for object files.
  88     AR_OUT_OPTION='rcs$(SPACE)'
  89   fi
  90   AC_SUBST(CC_OUT_OPTION)
  91   AC_SUBST(EXE_OUT_OPTION)
  92   AC_SUBST(LD_OUT_OPTION)
  93   AC_SUBST(AR_OUT_OPTION)
  94 
  95   # On Windows, we need to set RC flags.
  96   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
  97     RC_FLAGS="-nologo -l 0x409 -r"
  98     if test "x$VARIANT" = xOPT; then
  99       RC_FLAGS="$RC_FLAGS -d NDEBUG"
 100     fi
 101 
 102     # The version variables used to create RC_FLAGS may be overridden
 103     # in a custom configure script, or possibly the command line.
 104     # Let those variables be expanded at make time in spec.gmk.
 105     # The \$ are escaped to the shell, and the $(...) variables
 106     # are evaluated by make.
 107     RC_FLAGS="$RC_FLAGS \
 108         -d \"JDK_BUILD_ID=\$(FULL_VERSION)\" \
 109         -d \"JDK_COMPANY=\$(COMPANY_NAME)\" \
 110         -d \"JDK_COMPONENT=\$(PRODUCT_NAME) \$(JDK_RC_PLATFORM_NAME) binary\" \
 111         -d \"JDK_VER=\$(JDK_MINOR_VERSION).\$(JDK_MICRO_VERSION).\$(if \$(JDK_UPDATE_VERSION),\$(JDK_UPDATE_VERSION),0).\$(COOKED_BUILD_NUMBER)\" \
 112         -d \"JDK_COPYRIGHT=Copyright \xA9 $COPYRIGHT_YEAR\" \
 113         -d \"JDK_NAME=\$(PRODUCT_NAME) \$(JDK_RC_PLATFORM_NAME) \$(JDK_MINOR_VERSION) \$(JDK_UPDATE_META_TAG)\" \
 114         -d \"JDK_FVER=\$(JDK_MINOR_VERSION),\$(JDK_MICRO_VERSION),\$(if \$(JDK_UPDATE_VERSION),\$(JDK_UPDATE_VERSION),0),\$(COOKED_BUILD_NUMBER)\""
 115   fi
 116   AC_SUBST(RC_FLAGS)
 117 
 118   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 119     # FIXME: likely bug, should be CCXXFLAGS_JDK? or one for C or CXX.
 120     CCXXFLAGS="$CCXXFLAGS -nologo"
 121   fi
 122 
 123   if test "x$SYSROOT" != "x"; then
 124     if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 125       if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 126         # Solaris Studio does not have a concept of sysroot. Instead we must
 127         # make sure the default include and lib dirs are appended to each 
 128         # compile and link command line.
 129         SYSROOT_CFLAGS="-I$SYSROOT/usr/include"
 130         SYSROOT_LDFLAGS="-L$SYSROOT/usr/lib$OPENJDK_TARGET_CPU_ISADIR \
 131             -L$SYSROOT/lib$OPENJDK_TARGET_CPU_ISADIR \
 132             -L$SYSROOT/usr/ccs/lib$OPENJDK_TARGET_CPU_ISADIR"
 133       fi
 134     elif test "x$TOOLCHAIN_TYPE" = xgcc; then
 135       SYSROOT_CFLAGS="--sysroot=\"$SYSROOT\""
 136       SYSROOT_LDFLAGS="--sysroot=\"$SYSROOT\""
 137     elif test "x$TOOLCHAIN_TYPE" = xclang; then
 138       SYSROOT_CFLAGS="-isysroot \"$SYSROOT\""
 139       SYSROOT_LDFLAGS="-isysroot \"$SYSROOT\""
 140     fi
 141     # Propagate the sysroot args to hotspot
 142     LEGACY_EXTRA_CFLAGS="$LEGACY_EXTRA_CFLAGS $SYSROOT_CFLAGS"
 143     LEGACY_EXTRA_CXXFLAGS="$LEGACY_EXTRA_CXXFLAGS $SYSROOT_CFLAGS"
 144     LEGACY_EXTRA_LDFLAGS="$LEGACY_EXTRA_LDFLAGS $SYSROOT_LDFLAGS"
 145   fi
 146   AC_SUBST(SYSROOT_CFLAGS)
 147   AC_SUBST(SYSROOT_LDFLAGS)
 148 ])
 149 
 150 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_LIBS],
 151 [
 152   ###############################################################################
 153   #
 154   # How to compile shared libraries.
 155   #
 156 
 157   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 158     PICFLAG="-fPIC"
 159     C_FLAG_REORDER=''
 160     CXX_FLAG_REORDER=''
 161 
 162     if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 163       # Linking is different on MacOSX
 164       SHARED_LIBRARY_FLAGS="-dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0 $PICFLAG"
 165       SET_EXECUTABLE_ORIGIN='-Xlinker -rpath -Xlinker @loader_path/.'
 166       SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"
 167       SET_SHARED_LIBRARY_NAME='-Xlinker -install_name -Xlinker @rpath/[$]1'
 168       SET_SHARED_LIBRARY_MAPFILE=''
 169     else
 170       # Default works for linux, might work on other platforms as well.
 171       SHARED_LIBRARY_FLAGS='-shared'
 172       SET_EXECUTABLE_ORIGIN='-Xlinker -rpath -Xlinker \$$$$ORIGIN[$]1'
 173       SET_SHARED_LIBRARY_ORIGIN="-Xlinker -z -Xlinker origin $SET_EXECUTABLE_ORIGIN"
 174       SET_SHARED_LIBRARY_NAME='-Xlinker -soname=[$]1'
 175       SET_SHARED_LIBRARY_MAPFILE='-Xlinker -version-script=[$]1'
 176     fi
 177   elif test "x$TOOLCHAIN_TYPE" = xclang; then
 178     PICFLAG=''
 179     C_FLAG_REORDER=''
 180     CXX_FLAG_REORDER=''
 181 
 182     if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 183       # Linking is different on MacOSX
 184       SHARED_LIBRARY_FLAGS="-dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0 $PICFLAG"
 185       SET_EXECUTABLE_ORIGIN='-Xlinker -rpath -Xlinker @loader_path/.'
 186       SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"
 187       SET_SHARED_LIBRARY_NAME='-Xlinker -install_name -Xlinker @rpath/[$]1'
 188       SET_SHARED_LIBRARY_MAPFILE=''
 189     else
 190       # Default works for linux, might work on other platforms as well.
 191       SHARED_LIBRARY_FLAGS='-shared'
 192       SET_EXECUTABLE_ORIGIN='-Xlinker -rpath -Xlinker \$$$$ORIGIN[$]1'
 193       SET_SHARED_LIBRARY_ORIGIN="-Xlinker -z -Xlinker origin $SET_EXECUTABLE_ORIGIN"
 194       SET_SHARED_LIBRARY_NAME='-Xlinker -soname=[$]1'
 195       SET_SHARED_LIBRARY_MAPFILE='-Xlinker -version-script=[$]1'
 196     fi
 197   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 198     PICFLAG="-KPIC"
 199     C_FLAG_REORDER='-xF'
 200     CXX_FLAG_REORDER='-xF'
 201     SHARED_LIBRARY_FLAGS="-G"
 202     SET_EXECUTABLE_ORIGIN='-R\$$$$ORIGIN[$]1'
 203     SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"
 204     SET_SHARED_LIBRARY_NAME=''
 205     SET_SHARED_LIBRARY_MAPFILE='-M[$]1'
 206   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 207     PICFLAG="-qpic=large"
 208     C_FLAG_REORDER=''
 209     CXX_FLAG_REORDER=''
 210     SHARED_LIBRARY_FLAGS="-qmkshrobj"
 211     SET_EXECUTABLE_ORIGIN=""
 212     SET_SHARED_LIBRARY_ORIGIN=''
 213     SET_SHARED_LIBRARY_NAME=''
 214     SET_SHARED_LIBRARY_MAPFILE=''
 215   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 216     PICFLAG=""
 217     C_FLAG_REORDER=''
 218     CXX_FLAG_REORDER=''
 219     SHARED_LIBRARY_FLAGS="-LD"
 220     SET_EXECUTABLE_ORIGIN=''
 221     SET_SHARED_LIBRARY_ORIGIN=''
 222     SET_SHARED_LIBRARY_NAME=''
 223     SET_SHARED_LIBRARY_MAPFILE=''
 224   fi
 225 
 226   AC_SUBST(C_FLAG_REORDER)
 227   AC_SUBST(CXX_FLAG_REORDER)
 228   AC_SUBST(SHARED_LIBRARY_FLAGS)
 229   AC_SUBST(SET_EXECUTABLE_ORIGIN)
 230   AC_SUBST(SET_SHARED_LIBRARY_ORIGIN)
 231   AC_SUBST(SET_SHARED_LIBRARY_NAME)
 232   AC_SUBST(SET_SHARED_LIBRARY_MAPFILE)
 233 
 234   if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 235     CFLAGS_JDK="${CFLAGS_JDK} -D__solaris__"
 236     CXXFLAGS_JDK="${CXXFLAGS_JDK} -D__solaris__"
 237     CFLAGS_JDKLIB_EXTRA='-xstrconst'
 238   fi
 239   # The (cross) compiler is now configured, we can now test capabilities
 240   # of the target platform.
 241 ])
 242 
 243 # Documentation on common flags used for solstudio in HIGHEST.
 244 #
 245 # WARNING: Use of OPTIMIZATION_LEVEL=HIGHEST in your Makefile needs to be
 246 #          done with care, there are some assumptions below that need to
 247 #          be understood about the use of pointers, and IEEE behavior.
 248 #
 249 # -fns: Use non-standard floating point mode (not IEEE 754)
 250 # -fsimple: Do some simplification of floating point arithmetic (not IEEE 754)
 251 # -fsingle: Use single precision floating point with 'float'
 252 # -xalias_level=basic: Assume memory references via basic pointer types do not alias
 253 #   (Source with excessing pointer casting and data access with mixed
 254 #    pointer types are not recommended)
 255 # -xbuiltin=%all: Use intrinsic or inline versions for math/std functions
 256 #   (If you expect perfect errno behavior, do not use this)
 257 # -xdepend: Loop data dependency optimizations (need -xO3 or higher)
 258 # -xrestrict: Pointer parameters to functions do not overlap
 259 #   (Similar to -xalias_level=basic usage, but less obvious sometimes.
 260 #    If you pass in multiple pointers to the same data, do not use this)
 261 # -xlibmil: Inline some library routines
 262 #   (If you expect perfect errno behavior, do not use this)
 263 # -xlibmopt: Use optimized math routines (CURRENTLY DISABLED)
 264 #   (If you expect perfect errno behavior, do not use this)
 265 #  Can cause undefined external on Solaris 8 X86 on __sincos, removing for now
 266 
 267     # FIXME: this will never happen since sparc != sparcv9, ie 32 bit, which we don't build anymore.
 268     # Bug?
 269     #if test "x$OPENJDK_TARGET_CPU" = xsparc; then
 270     #  CFLAGS_JDK="${CFLAGS_JDK} -xmemalign=4s"
 271     #  CXXFLAGS_JDK="${CXXFLAGS_JDK} -xmemalign=4s"
 272     #fi
 273 
 274 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_OPTIMIZATION],
 275 [
 276 
 277   ###############################################################################
 278   #
 279   # Setup the opt flags for different compilers
 280   # and different operating systems.
 281   #
 282 
 283   # FIXME: this was indirectly the old default, but just inherited.
 284   # if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 285   #   C_FLAG_DEPS="-MMD -MF"
 286   # fi
 287 
 288   # Generate make dependency files
 289   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 290     C_FLAG_DEPS="-MMD -MF"
 291   elif test "x$TOOLCHAIN_TYPE" = xclang; then
 292     C_FLAG_DEPS="-MMD -MF"
 293   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 294     C_FLAG_DEPS="-xMMD -xMF"
 295   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 296     C_FLAG_DEPS="-qmakedep=gcc -MF"
 297   fi
 298   CXX_FLAG_DEPS="$C_FLAG_DEPS"
 299   AC_SUBST(C_FLAG_DEPS)
 300   AC_SUBST(CXX_FLAG_DEPS)
 301 
 302   # Debug symbols
 303   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 304     if test "x$OPENJDK_TARGET_CPU_BITS" = "x64" && test "x$DEBUG_LEVEL" = "xfastdebug"; then
 305       CFLAGS_DEBUG_SYMBOLS="-g1"
 306       CXXFLAGS_DEBUG_SYMBOLS="-g1"
 307     else
 308       CFLAGS_DEBUG_SYMBOLS="-g"
 309       CXXFLAGS_DEBUG_SYMBOLS="-g"
 310     fi
 311   elif test "x$TOOLCHAIN_TYPE" = xclang; then
 312     CFLAGS_DEBUG_SYMBOLS="-g"
 313     CXXFLAGS_DEBUG_SYMBOLS="-g"
 314   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 315     CFLAGS_DEBUG_SYMBOLS="-g -xs"
 316     CXXFLAGS_DEBUG_SYMBOLS="-g0 -xs"
 317   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 318     CFLAGS_DEBUG_SYMBOLS="-g"
 319     CXXFLAGS_DEBUG_SYMBOLS="-g"
 320   fi
 321   AC_SUBST(CFLAGS_DEBUG_SYMBOLS)
 322   AC_SUBST(CXXFLAGS_DEBUG_SYMBOLS)
 323 
 324   # Optimization levels
 325   if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 326     CC_HIGHEST="$CC_HIGHEST -fns -fsimple -fsingle -xbuiltin=%all -xdepend -xrestrict -xlibmil"
 327 
 328     if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86"; then
 329       # FIXME: seems we always set -xregs=no%frameptr; put it elsewhere more global?
 330       C_O_FLAG_HIGHEST="-xO4 -Wu,-O4~yz $CC_HIGHEST -xalias_level=basic -xregs=no%frameptr"
 331       C_O_FLAG_HI="-xO4 -Wu,-O4~yz -xregs=no%frameptr"
 332       C_O_FLAG_NORM="-xO2 -Wu,-O2~yz -xregs=no%frameptr"
 333       C_O_FLAG_NONE="-xregs=no%frameptr"
 334       CXX_O_FLAG_HIGHEST="-xO4 -Qoption ube -O4~yz $CC_HIGHEST -xregs=no%frameptr"
 335       CXX_O_FLAG_HI="-xO4 -Qoption ube -O4~yz -xregs=no%frameptr"
 336       CXX_O_FLAG_NORM="-xO2 -Qoption ube -O2~yz -xregs=no%frameptr"
 337       CXX_O_FLAG_NONE="-xregs=no%frameptr"
 338       if test "x$OPENJDK_TARGET_CPU_BITS" = "x32"; then
 339         C_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST -xchip=pentium"
 340         CXX_O_FLAG_HIGHEST="$CXX_O_FLAG_HIGHEST -xchip=pentium"
 341       fi
 342     elif test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then
 343       C_O_FLAG_HIGHEST="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0 $CC_HIGHEST -xalias_level=basic -xprefetch=auto,explicit -xchip=ultra"
 344       C_O_FLAG_HI="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0"
 345       C_O_FLAG_NORM="-xO2 -Wc,-Qrm-s -Wc,-Qiselect-T0"
 346       C_O_FLAG_NONE=""
 347       CXX_O_FLAG_HIGHEST="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0 $CC_HIGHEST -xprefetch=auto,explicit -xchip=ultra"
 348       CXX_O_FLAG_HI="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
 349       CXX_O_FLAG_NORM="-xO2 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
 350       CXX_O_FLAG_NONE=""
 351     fi
 352   else
 353     # The remaining toolchains share opt flags between CC and CXX;
 354     # setup for C and duplicate afterwards.
 355     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 356       if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 357         # On MacOSX we optimize for size, something
 358         # we should do for all platforms?
 359         C_O_FLAG_HIGHEST="-Os"
 360         C_O_FLAG_HI="-Os"
 361         C_O_FLAG_NORM="-Os"
 362         C_O_FLAG_NONE=""
 363       else
 364         C_O_FLAG_HIGHEST="-O3"
 365         C_O_FLAG_HI="-O3"
 366         C_O_FLAG_NORM="-O2"
 367         C_O_FLAG_NONE="-O0"
 368       fi
 369     elif test "x$TOOLCHAIN_TYPE" = xclang; then
 370       if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 371         # On MacOSX we optimize for size, something
 372         # we should do for all platforms?
 373         C_O_FLAG_HIGHEST="-Os"
 374         C_O_FLAG_HI="-Os"
 375         C_O_FLAG_NORM="-Os"
 376         C_O_FLAG_NONE=""
 377       else
 378         C_O_FLAG_HIGHEST="-O3"
 379         C_O_FLAG_HI="-O3"
 380         C_O_FLAG_NORM="-O2"
 381         C_O_FLAG_NONE="-O0"
 382       fi
 383     elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 384       C_O_FLAG_HIGHEST="-O3"
 385       C_O_FLAG_HI="-O3 -qstrict"
 386       C_O_FLAG_NORM="-O2"
 387       C_O_FLAG_NONE=""
 388     elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 389       C_O_FLAG_HIGHEST="-O2"
 390       C_O_FLAG_HI="-O1"
 391       C_O_FLAG_NORM="-O1"
 392       C_O_FLAG_NONE="-Od"
 393     fi
 394     CXX_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST"
 395     CXX_O_FLAG_HI="$C_O_FLAG_HI"
 396     CXX_O_FLAG_NORM="$C_O_FLAG_NORM"
 397     CXX_O_FLAG_NONE="$C_O_FLAG_NONE"
 398   fi
 399 
 400   AC_SUBST(C_O_FLAG_HIGHEST)
 401   AC_SUBST(C_O_FLAG_HI)
 402   AC_SUBST(C_O_FLAG_NORM)
 403   AC_SUBST(C_O_FLAG_NONE)
 404   AC_SUBST(CXX_O_FLAG_HIGHEST)
 405   AC_SUBST(CXX_O_FLAG_HI)
 406   AC_SUBST(CXX_O_FLAG_NORM)
 407   AC_SUBST(CXX_O_FLAG_NONE)
 408 ])
 409 
 410 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_JDK],
 411 [
 412   # Special extras...
 413   if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 414     if test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then
 415       CFLAGS_JDKLIB_EXTRA="${CFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
 416       CXXFLAGS_JDKLIB_EXTRA="${CXXFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
 417     fi
 418   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 419     LDFLAGS_JDK="${LDFLAGS_JDK} -q64 -brtl -bnolibpath -liconv -bexpall"
 420     CFLAGS_JDK="${CFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
 421     CXXFLAGS_JDK="${CXXFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
 422   fi
 423 
 424   if test "x$CFLAGS" != "x${ADDED_CFLAGS}"; then
 425     AC_MSG_WARN([Ignoring CFLAGS($CFLAGS) found in environment. Use --with-extra-cflags])
 426   fi
 427 
 428   if test "x$CXXFLAGS" != "x${ADDED_CXXFLAGS}"; then
 429     AC_MSG_WARN([Ignoring CXXFLAGS($CXXFLAGS) found in environment. Use --with-extra-cxxflags])
 430   fi
 431 
 432   if test "x$LDFLAGS" != "x${ADDED_LDFLAGS}"; then
 433     AC_MSG_WARN([Ignoring LDFLAGS($LDFLAGS) found in environment. Use --with-extra-ldflags])
 434   fi
 435 
 436   AC_ARG_WITH(extra-cflags, [AS_HELP_STRING([--with-extra-cflags],
 437       [extra flags to be used when compiling jdk c-files])])
 438 
 439   AC_ARG_WITH(extra-cxxflags, [AS_HELP_STRING([--with-extra-cxxflags],
 440       [extra flags to be used when compiling jdk c++-files])])
 441 
 442   AC_ARG_WITH(extra-ldflags, [AS_HELP_STRING([--with-extra-ldflags],
 443       [extra flags to be used when linking jdk])])
 444 
 445   CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
 446   CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
 447   LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"
 448 
 449   # Hotspot needs these set in their legacy form
 450   LEGACY_EXTRA_CFLAGS="$LEGACY_EXTRA_CFLAGS $with_extra_cflags"
 451   LEGACY_EXTRA_CXXFLAGS="$LEGACY_EXTRA_CXXFLAGS $with_extra_cxxflags"
 452   LEGACY_EXTRA_LDFLAGS="$LEGACY_EXTRA_LDFLAGS $with_extra_ldflags"
 453 
 454   AC_SUBST(LEGACY_EXTRA_CFLAGS)
 455   AC_SUBST(LEGACY_EXTRA_CXXFLAGS)
 456   AC_SUBST(LEGACY_EXTRA_LDFLAGS)
 457 
 458   ###############################################################################
 459   #
 460   # Now setup the CFLAGS and LDFLAGS for the JDK build.
 461   # Later we will also have CFLAGS and LDFLAGS for the hotspot subrepo build.
 462   #
 463 
 464   # Setup compiler/platform specific flags to CFLAGS_JDK,
 465   # CXXFLAGS_JDK and CCXXFLAGS_JDK (common to C and CXX?)
 466   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 467     # these options are used for both C and C++ compiles
 468     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -Wall -Wno-parentheses -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2 \
 469         -pipe -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE"
 470     case $OPENJDK_TARGET_CPU_ARCH in
 471       arm )
 472         # on arm we don't prevent gcc to omit frame pointer but do prevent strict aliasing
 473         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
 474         ;;
 475       ppc )
 476         # on ppc we don't prevent gcc to omit frame pointer nor strict-aliasing
 477         ;;
 478       * )
 479         CCXXFLAGS_JDK="$CCXXFLAGS_JDK -fno-omit-frame-pointer"
 480         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
 481         ;;
 482     esac
 483   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 484     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -DTRACING -DMACRO_MEMSYS_OPS -DBREAKPTS"
 485     if test "x$OPENJDK_TARGET_CPU_ARCH" = xx86; then
 486       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DcpuIntel -Di586 -D$OPENJDK_TARGET_CPU_LEGACY_LIB"
 487       CFLAGS_JDK="$CFLAGS_JDK -erroff=E_BAD_PRAGMA_PACK_VALUE"
 488     fi
 489   
 490     CFLAGS_JDK="$CFLAGS_JDK -xc99=%none -xCC -errshort=tags -Xa -v -mt -W0,-noglobal"
 491     CXXFLAGS_JDK="$CXXFLAGS_JDK -errtags=yes +w -mt -features=no%except -DCC_NOEX -norunpath -xnolib"
 492   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 493     CFLAGS_JDK="$CFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"
 494     CXXFLAGS_JDK="$CXXFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"
 495   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 496     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -Zi -MD -Zc:wchar_t- -W3 -wd4800 \
 497     -D_STATIC_CPPLIB -D_DISABLE_DEPRECATE_STATIC_CPPLIB -DWIN32_LEAN_AND_MEAN \
 498     -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE \
 499     -DWIN32 -DIAL"
 500     if test "x$OPENJDK_TARGET_CPU" = xx86_64; then
 501       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_AMD64_ -Damd64"
 502     else
 503       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_X86_ -Dx86"
 504     fi
 505   fi
 506 
 507   ###############################################################################
 508 
 509   # Adjust flags according to debug level.
 510   case $DEBUG_LEVEL in
 511     fastdebug )
 512       CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
 513       CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
 514       C_O_FLAG_HI="$C_O_FLAG_NORM"
 515       C_O_FLAG_NORM="$C_O_FLAG_NORM"
 516       CXX_O_FLAG_HI="$CXX_O_FLAG_NORM"
 517       CXX_O_FLAG_NORM="$CXX_O_FLAG_NORM"
 518       JAVAC_FLAGS="$JAVAC_FLAGS -g"
 519       ;;
 520     slowdebug )
 521       CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
 522       CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
 523       C_O_FLAG_HI="$C_O_FLAG_NONE"
 524       C_O_FLAG_NORM="$C_O_FLAG_NONE"
 525       CXX_O_FLAG_HI="$CXX_O_FLAG_NONE"
 526       CXX_O_FLAG_NORM="$CXX_O_FLAG_NONE"
 527       JAVAC_FLAGS="$JAVAC_FLAGS -g"
 528       ;;
 529   esac
 530 
 531   # Setup LP64
 532   CCXXFLAGS_JDK="$CCXXFLAGS_JDK $ADD_LP64"
 533 
 534   # Set some common defines. These works for all compilers, but assume
 535   # -D is universally accepted.
 536 
 537   # Setup endianness
 538   if test "x$OPENJDK_TARGET_CPU_ENDIAN" = xlittle; then
 539     # The macro _LITTLE_ENDIAN needs to be defined the same to avoid the
 540     #   Sun C compiler warning message: warning: macro redefined: _LITTLE_ENDIAN
 541     #   (The Solaris X86 system defines this in file /usr/include/sys/isa_defs.h).
 542     #   Note: -Dmacro         is the same as    #define macro 1
 543     #         -Dmacro=        is the same as    #define macro
 544     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 545       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_LITTLE_ENDIAN="
 546     else
 547       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_LITTLE_ENDIAN"
 548     fi
 549   else
 550     # Same goes for _BIG_ENDIAN. Do we really need to set *ENDIAN on Solaris if they
 551     # are defined in the system?
 552     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 553       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_BIG_ENDIAN="
 554     else
 555       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_BIG_ENDIAN"
 556     fi
 557   fi
 558   
 559   # Setup target OS define. Use OS target name but in upper case.
 560   OPENJDK_TARGET_OS_UPPERCASE=`$ECHO $OPENJDK_TARGET_OS | $TR 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
 561   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D$OPENJDK_TARGET_OS_UPPERCASE"
 562 
 563   # Setup target CPU
 564   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DARCH='\"$OPENJDK_TARGET_CPU_LEGACY\"' -D$OPENJDK_TARGET_CPU_LEGACY"
 565   
 566   # Setup debug/release defines
 567   if test "x$DEBUG_LEVEL" = xrelease; then
 568     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DNDEBUG"
 569     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 570       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DTRIMMED"
 571     fi
 572   else
 573     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DDEBUG"
 574   fi
 575 
 576   # Setup release name
 577   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DRELEASE='\"\$(RELEASE)\"'"
 578 
 579 
 580   # Set some additional per-OS defines.
 581   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 582     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_ALLBSD_SOURCE -D_DARWIN_UNLIMITED_SELECT"
 583   elif test "x$OPENJDK_TARGET_OS" = xaix; then
 584     # FIXME: PPC64 should not be here.
 585     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DPPC64"
 586   elif test "x$OPENJDK_TARGET_OS" = xbsd; then
 587     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_ALLBSD_SOURCE"
 588   fi
 589 
 590   # Additional macosx handling
 591   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 592     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 593       # FIXME: This needs to be exported in spec.gmk due to closed legacy code.
 594       # FIXME: clean this up, and/or move it elsewhere.
 595 
 596       # Setting these parameters makes it an error to link to macosx APIs that are
 597       # newer than the given OS version and makes the linked binaries compatible 
 598       # even if built on a newer version of the OS.
 599       # The expected format is X.Y.Z
 600       MACOSX_VERSION_MIN=10.7.0
 601       AC_SUBST(MACOSX_VERSION_MIN)
 602     
 603       # The macro takes the version with no dots, ex: 1070
 604       # Let the flags variables get resolved in make for easier override on make
 605       # command line.
 606       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DMAC_OS_X_VERSION_MAX_ALLOWED=\$(subst .,,\$(MACOSX_VERSION_MIN)) -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
 607       LDFLAGS_JDK="$LDFLAGS_JDK -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
 608     fi
 609   fi
 610 
 611   # Setup some hard coded includes
 612   CCXXFLAGS_JDK="$CCXXFLAGS_JDK \
 613       -I${JDK_OUTPUTDIR}/include \
 614       -I${JDK_OUTPUTDIR}/include/$OPENJDK_TARGET_OS \
 615       -I${JDK_TOPDIR}/src/share/javavm/export \
 616       -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_EXPORT_DIR/javavm/export \
 617       -I${JDK_TOPDIR}/src/share/native/common \
 618       -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_API_DIR/native/common"
 619 
 620   # The shared libraries are compiled using the picflag.
 621   CFLAGS_JDKLIB="$CCXXFLAGS_JDK $CFLAGS_JDK $PICFLAG $CFLAGS_JDKLIB_EXTRA"
 622   CXXFLAGS_JDKLIB="$CCXXFLAGS_JDK $CXXFLAGS_JDK $PICFLAG $CXXFLAGS_JDKLIB_EXTRA "
 623 
 624   # Executable flags
 625   CFLAGS_JDKEXE="$CCXXFLAGS_JDK $CFLAGS_JDK"
 626   CXXFLAGS_JDKEXE="$CCXXFLAGS_JDK $CXXFLAGS_JDK"
 627 
 628   AC_SUBST(CFLAGS_JDKLIB)
 629   AC_SUBST(CFLAGS_JDKEXE)
 630   AC_SUBST(CXXFLAGS_JDKLIB)
 631   AC_SUBST(CXXFLAGS_JDKEXE)
 632 
 633   # Setup LDFLAGS et al.
 634   #
 635   # Now this is odd. The JDK native libraries have to link against libjvm.so
 636   # On 32-bit machines there is normally two distinct libjvm.so:s, client and server.
 637   # Which should we link to? Are we lucky enough that the binary api to the libjvm.so library
 638   # is identical for client and server? Yes. Which is picked at runtime (client or server)?
 639   # Neither, since the chosen libjvm.so has already been loaded by the launcher, all the following
 640   # libraries will link to whatever is in memory. Yuck.
 641   #
 642   # Thus we offer the compiler to find libjvm.so first in server then in client. It works. Ugh.
 643   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 644     LDFLAGS_JDK="$LDFLAGS_JDK -nologo -opt:ref -incremental:no"
 645     if test "x$OPENJDK_TARGET_CPU_BITS" = "x32"; then
 646       LDFLAGS_JDK="$LDFLAGS_JDK -safeseh"
 647     fi
 648     # TODO: make -debug optional "--disable-full-debug-symbols"
 649     LDFLAGS_JDK="$LDFLAGS_JDK -debug"
 650     LDFLAGS_JDKLIB="${LDFLAGS_JDK} -dll -libpath:${JDK_OUTPUTDIR}/lib"
 651     LDFLAGS_JDKLIB_SUFFIX=""
 652     if test "x$OPENJDK_TARGET_CPU_BITS" = "x64"; then
 653       LDFLAGS_STACK_SIZE=1048576
 654     else
 655       LDFLAGS_STACK_SIZE=327680
 656     fi
 657     LDFLAGS_JDKEXE="${LDFLAGS_JDK} /STACK:$LDFLAGS_STACK_SIZE"
 658   else
 659     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 660       # If this is a --hash-style=gnu system, use --hash-style=both, why?
 661       # We have previously set HAS_GNU_HASH if this is the case
 662       if test -n "$HAS_GNU_HASH"; then
 663         LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker --hash-style=both "
 664       fi
 665       if test "x$OPENJDK_TARGET_OS" = xlinux; then
 666         # And since we now know that the linker is gnu, then add -z defs, to forbid
 667         # undefined symbols in object files.
 668         LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -z -Xlinker defs"
 669         if test "x$DEBUG_LEVEL" = "xrelease"; then
 670           # When building release libraries, tell the linker optimize them.
 671           # Should this be supplied to the OSS linker as well?
 672           LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -O1"
 673         fi
 674       fi
 675     fi
 676 
 677     if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 678       LDFLAGS_JDK="$LDFLAGS_JDK -z defs -xildoff -ztext"
 679       LDFLAGS_CXX_JDK="$LDFLAGS_CXX_JDK -norunpath -xnolib"
 680     fi
 681 
 682     LDFLAGS_JDKLIB="${LDFLAGS_JDK} $SHARED_LIBRARY_FLAGS \
 683         -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}"
 684 
 685     # On some platforms (mac) the linker warns about non existing -L dirs.
 686     # Add server first if available. Linking aginst client does not always produce the same results.
 687     # Only add client dir if client is being built. Add minimal (note not minimal1) if only building minimal1.
 688     # Default to server for other variants.
 689     if test "x$JVM_VARIANT_SERVER" = xtrue; then
 690       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
 691     elif test "x$JVM_VARIANT_CLIENT" = xtrue; then
 692       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/client"
 693     elif test "x$JVM_VARIANT_MINIMAL1" = xtrue; then
 694       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/minimal"
 695     else
 696       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
 697     fi
 698 
 699     LDFLAGS_JDKLIB_SUFFIX="-ljava -ljvm"
 700     if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 701       LDFLAGS_JDKLIB_SUFFIX="$LDFLAGS_JDKLIB_SUFFIX -lc"
 702     fi
 703 
 704     LDFLAGS_JDKEXE="${LDFLAGS_JDK}"
 705     if test "x$OPENJDK_TARGET_OS" = xlinux; then
 706       LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE -Xlinker --allow-shlib-undefined"
 707     fi
 708   fi
 709   AC_SUBST(LDFLAGS_JDKLIB)
 710   AC_SUBST(LDFLAGS_JDKEXE)
 711   AC_SUBST(LDFLAGS_JDKLIB_SUFFIX)
 712   AC_SUBST(LDFLAGS_JDKEXE_SUFFIX)
 713   AC_SUBST(LDFLAGS_CXX_JDK)
 714 ])
 715 
 716 
 717 # FLAGS_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
 718 #                                   [RUN-IF-FALSE])
 719 # ------------------------------------------------------------
 720 # Check that the c and c++ compilers support an argument
 721 AC_DEFUN([FLAGS_COMPILER_CHECK_ARGUMENTS],
 722 [
 723   AC_MSG_CHECKING([if compiler supports "$1"])
 724   supports=yes
 725 
 726   saved_cflags="$CFLAGS"
 727   CFLAGS="$CFLAGS $1"
 728   AC_LANG_PUSH([C])
 729   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
 730       [supports=no])
 731   AC_LANG_POP([C])
 732   CFLAGS="$saved_cflags"
 733 
 734   saved_cxxflags="$CXXFLAGS"
 735   CXXFLAGS="$CXXFLAG $1"
 736   AC_LANG_PUSH([C++])
 737   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
 738       [supports=no])
 739   AC_LANG_POP([C++])
 740   CXXFLAGS="$saved_cxxflags"
 741 
 742   AC_MSG_RESULT([$supports])
 743   if test "x$supports" = "xyes" ; then
 744     m4_ifval([$2], [$2], [:])
 745   else
 746     m4_ifval([$3], [$3], [:])
 747   fi
 748 ])
 749 
 750 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_MISC],
 751 [
 752   # Some Zero and Shark settings.
 753   # ZERO_ARCHFLAG tells the compiler which mode to build for
 754   case "${OPENJDK_TARGET_CPU}" in
 755     s390)
 756       ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}31"
 757       ;;
 758     *)
 759       ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"
 760   esac
 761   FLAGS_COMPILER_CHECK_ARGUMENTS([$ZERO_ARCHFLAG], [], [ZERO_ARCHFLAG=""])
 762   AC_SUBST(ZERO_ARCHFLAG)
 763 
 764   # Check that the compiler supports -mX (or -qX on AIX) flags
 765   # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does
 766   FLAGS_COMPILER_CHECK_ARGUMENTS([${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}],
 767       [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],
 768       [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
 769   AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)
 770 
 771   case "${TOOLCHAIN_TYPE}" in
 772     microsoft)
 773       CFLAGS_WARNINGS_ARE_ERRORS="/WX"
 774       ;;
 775     solstudio)
 776       CFLAGS_WARNINGS_ARE_ERRORS="-errtags -errwarn=%all"
 777       ;;
 778     gcc)
 779       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
 780       ;;
 781     clang)
 782       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
 783       ;;
 784   esac
 785   AC_SUBST(CFLAGS_WARNINGS_ARE_ERRORS)
 786 ])
--- EOF ---