1 #
   2 # Copyright (c) 2011, 2018, 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 \$$$$ORIGIN[$]1'
 173       SET_SHARED_LIBRARY_ORIGIN="-Xlinker -z -Xlinker origin $SET_EXECUTABLE_ORIGIN"
 174       SET_SHARED_LIBRARY_NAME='-Xlinker -soname=[$]1'
 175       SET_SHARED_LIBRARY_MAPFILE='-Xlinker -version-script=[$]1'
 176     fi
 177   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 178     PICFLAG="-KPIC"
 179     C_FLAG_REORDER='-xF'
 180     CXX_FLAG_REORDER='-xF'
 181     SHARED_LIBRARY_FLAGS="-G"
 182     SET_EXECUTABLE_ORIGIN='-R\$$$$ORIGIN[$]1'
 183     SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"
 184     SET_SHARED_LIBRARY_NAME=''
 185     SET_SHARED_LIBRARY_MAPFILE='-M[$]1'
 186   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 187     PICFLAG="-qpic=large"
 188     C_FLAG_REORDER=''
 189     CXX_FLAG_REORDER=''
 190     SHARED_LIBRARY_FLAGS="-qmkshrobj"
 191     SET_EXECUTABLE_ORIGIN=""
 192     SET_SHARED_LIBRARY_ORIGIN=''
 193     SET_SHARED_LIBRARY_NAME=''
 194     SET_SHARED_LIBRARY_MAPFILE=''
 195   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 196     PICFLAG=""
 197     C_FLAG_REORDER=''
 198     CXX_FLAG_REORDER=''
 199     SHARED_LIBRARY_FLAGS="-LD"
 200     SET_EXECUTABLE_ORIGIN=''
 201     SET_SHARED_LIBRARY_ORIGIN=''
 202     SET_SHARED_LIBRARY_NAME=''
 203     SET_SHARED_LIBRARY_MAPFILE=''
 204   fi
 205 
 206   AC_SUBST(C_FLAG_REORDER)
 207   AC_SUBST(CXX_FLAG_REORDER)
 208   AC_SUBST(SHARED_LIBRARY_FLAGS)
 209   AC_SUBST(SET_EXECUTABLE_ORIGIN)
 210   AC_SUBST(SET_SHARED_LIBRARY_ORIGIN)
 211   AC_SUBST(SET_SHARED_LIBRARY_NAME)
 212   AC_SUBST(SET_SHARED_LIBRARY_MAPFILE)
 213 
 214   if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 215     CFLAGS_JDK="${CFLAGS_JDK} -D__solaris__"
 216     CXXFLAGS_JDK="${CXXFLAGS_JDK} -D__solaris__"
 217     CFLAGS_JDKLIB_EXTRA='-xstrconst'
 218   fi
 219   # The (cross) compiler is now configured, we can now test capabilities
 220   # of the target platform.
 221 ])
 222 
 223 # Documentation on common flags used for solstudio in HIGHEST.
 224 #
 225 # WARNING: Use of OPTIMIZATION_LEVEL=HIGHEST in your Makefile needs to be
 226 #          done with care, there are some assumptions below that need to
 227 #          be understood about the use of pointers, and IEEE behavior.
 228 #
 229 # -fns: Use non-standard floating point mode (not IEEE 754)
 230 # -fsimple: Do some simplification of floating point arithmetic (not IEEE 754)
 231 # -fsingle: Use single precision floating point with 'float'
 232 # -xalias_level=basic: Assume memory references via basic pointer types do not alias
 233 #   (Source with excessing pointer casting and data access with mixed
 234 #    pointer types are not recommended)
 235 # -xbuiltin=%all: Use intrinsic or inline versions for math/std functions
 236 #   (If you expect perfect errno behavior, do not use this)
 237 # -xdepend: Loop data dependency optimizations (need -xO3 or higher)
 238 # -xrestrict: Pointer parameters to functions do not overlap
 239 #   (Similar to -xalias_level=basic usage, but less obvious sometimes.
 240 #    If you pass in multiple pointers to the same data, do not use this)
 241 # -xlibmil: Inline some library routines
 242 #   (If you expect perfect errno behavior, do not use this)
 243 # -xlibmopt: Use optimized math routines (CURRENTLY DISABLED)
 244 #   (If you expect perfect errno behavior, do not use this)
 245 #  Can cause undefined external on Solaris 8 X86 on __sincos, removing for now
 246 
 247     # FIXME: this will never happen since sparc != sparcv9, ie 32 bit, which we don't build anymore.
 248     # Bug?
 249     #if test "x$OPENJDK_TARGET_CPU" = xsparc; then
 250     #  CFLAGS_JDK="${CFLAGS_JDK} -xmemalign=4s"
 251     #  CXXFLAGS_JDK="${CXXFLAGS_JDK} -xmemalign=4s"
 252     #fi
 253 
 254 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_OPTIMIZATION],
 255 [
 256 
 257   ###############################################################################
 258   #
 259   # Setup the opt flags for different compilers
 260   # and different operating systems.
 261   #
 262 
 263   # FIXME: this was indirectly the old default, but just inherited.
 264   # if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 265   #   C_FLAG_DEPS="-MMD -MF"
 266   # fi
 267 
 268   # Generate make dependency files
 269   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 270     C_FLAG_DEPS="-MMD -MF"
 271   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 272     C_FLAG_DEPS="-xMMD -xMF"
 273   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 274     C_FLAG_DEPS="-qmakedep=gcc -MF"
 275   fi
 276   CXX_FLAG_DEPS="$C_FLAG_DEPS"
 277   AC_SUBST(C_FLAG_DEPS)
 278   AC_SUBST(CXX_FLAG_DEPS)
 279 
 280   # Debug symbols
 281   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 282     if test "x$OPENJDK_TARGET_CPU_BITS" = "x64" && test "x$DEBUG_LEVEL" = "xfastdebug"; then
 283       CFLAGS_DEBUG_SYMBOLS="-g1"
 284       CXXFLAGS_DEBUG_SYMBOLS="-g1"
 285     else
 286       CFLAGS_DEBUG_SYMBOLS="-g"
 287       CXXFLAGS_DEBUG_SYMBOLS="-g"
 288     fi
 289   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 290     CFLAGS_DEBUG_SYMBOLS="-g -xs"
 291     CXXFLAGS_DEBUG_SYMBOLS="-g0 -xs"
 292   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 293     CFLAGS_DEBUG_SYMBOLS="-g"
 294     CXXFLAGS_DEBUG_SYMBOLS="-g"
 295   fi
 296   AC_SUBST(CFLAGS_DEBUG_SYMBOLS)
 297   AC_SUBST(CXXFLAGS_DEBUG_SYMBOLS)
 298 
 299   # Optimization levels
 300   if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 301     CC_HIGHEST="$CC_HIGHEST -fns -fsimple -fsingle -xalias_level=basic -xbuiltin=%all -xdepend -xrestrict -xlibmil"
 302 
 303     if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86"; then
 304       # FIXME: seems we always set -xregs=no%frameptr; put it elsewhere more global?
 305       C_O_FLAG_HIGHEST="-xO4 -Wu,-O4~yz $CC_HIGHEST -xregs=no%frameptr"
 306       C_O_FLAG_HI="-xO4 -Wu,-O4~yz -xregs=no%frameptr"
 307       C_O_FLAG_NORM="-xO2 -Wu,-O2~yz -xregs=no%frameptr"
 308       C_O_FLAG_NONE="-xregs=no%frameptr"
 309       CXX_O_FLAG_HIGHEST="-xO4 -Qoption ube -O4~yz $CC_HIGHEST -xregs=no%frameptr"
 310       CXX_O_FLAG_HI="-xO4 -Qoption ube -O4~yz -xregs=no%frameptr"
 311       CXX_O_FLAG_NORM="-xO2 -Qoption ube -O2~yz -xregs=no%frameptr"
 312       CXX_O_FLAG_NONE="-xregs=no%frameptr"
 313       if test "x$OPENJDK_TARGET_CPU_BITS" = "x32"; then
 314         C_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST -xchip=pentium"
 315         CXX_O_FLAG_HIGHEST="$CXX_O_FLAG_HIGHEST -xchip=pentium"
 316       fi
 317     elif test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then
 318       C_O_FLAG_HIGHEST="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0 $CC_HIGHEST -xprefetch=auto,explicit -xchip=ultra"
 319       C_O_FLAG_HI="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0"
 320       C_O_FLAG_NORM="-xO2 -Wc,-Qrm-s -Wc,-Qiselect-T0"
 321       C_O_FLAG_NONE=""
 322       CXX_O_FLAG_HIGHEST="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0 $CC_HIGHEST -xprefetch=auto,explicit -xchip=ultra"
 323       CXX_O_FLAG_HI="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
 324       CXX_O_FLAG_NORM="-xO2 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
 325       CXX_O_FLAG_NONE=""
 326     fi
 327   else
 328     # The remaining toolchains share opt flags between CC and CXX;
 329     # setup for C and duplicate afterwards.
 330     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 331       if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 332         # On MacOSX we optimize for size, something
 333         # we should do for all platforms?
 334         C_O_FLAG_HIGHEST="-Os"
 335         C_O_FLAG_HI="-Os"
 336         C_O_FLAG_NORM="-Os"
 337         C_O_FLAG_NONE=""
 338       else
 339         C_O_FLAG_HIGHEST="-O3"
 340         C_O_FLAG_HI="-O3"
 341         C_O_FLAG_NORM="-O2"
 342         C_O_FLAG_NONE="-O0"
 343       fi
 344     elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 345       C_O_FLAG_HIGHEST="-O3"
 346       C_O_FLAG_HI="-O3 -qstrict"
 347       C_O_FLAG_NORM="-O2"
 348       C_O_FLAG_NONE=""
 349     elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 350       C_O_FLAG_HIGHEST="-O2"
 351       C_O_FLAG_HI="-O1"
 352       C_O_FLAG_NORM="-O1"
 353       C_O_FLAG_NONE="-Od"
 354     fi
 355     CXX_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST"
 356     CXX_O_FLAG_HI="$C_O_FLAG_HI"
 357     CXX_O_FLAG_NORM="$C_O_FLAG_NORM"
 358     CXX_O_FLAG_NONE="$C_O_FLAG_NONE"
 359   fi
 360 
 361   AC_SUBST(C_O_FLAG_HIGHEST)
 362   AC_SUBST(C_O_FLAG_HI)
 363   AC_SUBST(C_O_FLAG_NORM)
 364   AC_SUBST(C_O_FLAG_NONE)
 365   AC_SUBST(CXX_O_FLAG_HIGHEST)
 366   AC_SUBST(CXX_O_FLAG_HI)
 367   AC_SUBST(CXX_O_FLAG_NORM)
 368   AC_SUBST(CXX_O_FLAG_NONE)
 369 ])
 370 
 371 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_JDK],
 372 [
 373   # Special extras...
 374   if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 375     if test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then
 376       CFLAGS_JDKLIB_EXTRA="${CFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
 377       CXXFLAGS_JDKLIB_EXTRA="${CXXFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
 378     fi
 379   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 380     LDFLAGS_JDK="${LDFLAGS_JDK} -q64 -brtl -bnolibpath -liconv -bexpall"
 381     CFLAGS_JDK="${CFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
 382     CXXFLAGS_JDK="${CXXFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
 383   elif test "x$TOOLCHAIN_TYPE" = xgcc; then
 384     $2CXXSTD_CXXFLAG="-std=gnu++98"
 385     FLAGS_CXX_COMPILER_CHECK_ARGUMENTS([[$]$2CXXSTD_CXXFLAG -Werror],
 386                                        [], [$2CXXSTD_CXXFLAG=""])
 387     $2CXXFLAGS_JDK="${$2CXXFLAGS_JDK} ${$2CXXSTD_CXXFLAG}"
 388     $2JVM_CFLAGS="${$2JVM_CFLAGS} ${$2CXXSTD_CXXFLAG}"
 389     AC_SUBST($2CXXSTD_CXXFLAG)
 390   fi
 391 
 392   if test "x$CFLAGS" != "x${ADDED_CFLAGS}"; then
 393     AC_MSG_WARN([Ignoring CFLAGS($CFLAGS) found in environment. Use --with-extra-cflags])
 394   fi
 395 
 396   if test "x$CXXFLAGS" != "x${ADDED_CXXFLAGS}"; then
 397     AC_MSG_WARN([Ignoring CXXFLAGS($CXXFLAGS) found in environment. Use --with-extra-cxxflags])
 398   fi
 399 
 400   if test "x$LDFLAGS" != "x${ADDED_LDFLAGS}"; then
 401     AC_MSG_WARN([Ignoring LDFLAGS($LDFLAGS) found in environment. Use --with-extra-ldflags])
 402   fi
 403 
 404   AC_ARG_WITH(extra-cflags, [AS_HELP_STRING([--with-extra-cflags],
 405       [extra flags to be used when compiling jdk c-files])])
 406 
 407   AC_ARG_WITH(extra-cxxflags, [AS_HELP_STRING([--with-extra-cxxflags],
 408       [extra flags to be used when compiling jdk c++-files])])
 409 
 410   AC_ARG_WITH(extra-ldflags, [AS_HELP_STRING([--with-extra-ldflags],
 411       [extra flags to be used when linking jdk])])
 412 
 413   CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
 414   CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
 415   LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"
 416 
 417   # Hotspot needs these set in their legacy form
 418   LEGACY_EXTRA_CFLAGS="$LEGACY_EXTRA_CFLAGS $with_extra_cflags"
 419   LEGACY_EXTRA_CXXFLAGS="$LEGACY_EXTRA_CXXFLAGS $with_extra_cxxflags"
 420   LEGACY_EXTRA_LDFLAGS="$LEGACY_EXTRA_LDFLAGS $with_extra_ldflags"
 421 
 422   AC_SUBST(LEGACY_EXTRA_CFLAGS)
 423   AC_SUBST(LEGACY_EXTRA_CXXFLAGS)
 424   AC_SUBST(LEGACY_EXTRA_LDFLAGS)
 425 
 426   ###############################################################################
 427   #
 428   # Now setup the CFLAGS and LDFLAGS for the JDK build.
 429   # Later we will also have CFLAGS and LDFLAGS for the hotspot subrepo build.
 430   #
 431 
 432   # Setup compiler/platform specific flags to CFLAGS_JDK,
 433   # CXXFLAGS_JDK and CCXXFLAGS_JDK (common to C and CXX?)
 434   if test "x$TOOLCHAIN_TYPE" = xgcc; then
 435     # these options are used for both C and C++ compiles
 436     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -Wall -Wno-parentheses -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2 \
 437         -pipe -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE"
 438     case $OPENJDK_TARGET_CPU_ARCH in
 439       arm )
 440         # on arm we don't prevent gcc to omit frame pointer but do prevent strict aliasing
 441         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
 442         ;;
 443       ppc )
 444         # on ppc we don't prevent gcc to omit frame pointer nor strict-aliasing
 445         ;;
 446       * )
 447         CCXXFLAGS_JDK="$CCXXFLAGS_JDK -fno-omit-frame-pointer"
 448         CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
 449         ;;
 450     esac
 451     TOOLCHAIN_CHECK_COMPILER_VERSION(6, FLAGS_SETUP_GCC6_COMPILER_FLAGS)
 452   elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 453     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -DTRACING -DMACRO_MEMSYS_OPS -DBREAKPTS"
 454     if test "x$OPENJDK_TARGET_CPU_ARCH" = xx86; then
 455       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DcpuIntel -Di586 -D$OPENJDK_TARGET_CPU_LEGACY_LIB"
 456       CFLAGS_JDK="$CFLAGS_JDK -erroff=E_BAD_PRAGMA_PACK_VALUE"
 457     fi
 458   
 459     CFLAGS_JDK="$CFLAGS_JDK -xc99=%none -xCC -errshort=tags -Xa -v -mt -W0,-noglobal"
 460     CXXFLAGS_JDK="$CXXFLAGS_JDK -errtags=yes +w -mt -features=no%except -DCC_NOEX -norunpath -xnolib"
 461   elif test "x$TOOLCHAIN_TYPE" = xxlc; then
 462     CFLAGS_JDK="$CFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"
 463     CXXFLAGS_JDK="$CXXFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"
 464   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 465     CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK \
 466         -Zi -MD -Zc:wchar_t- -W3 -wd4800 \
 467         -DWIN32_LEAN_AND_MEAN \
 468         -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE \
 469         -DWIN32 -DIAL"
 470     if test "x$OPENJDK_TARGET_CPU" = xx86_64; then
 471       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_AMD64_ -Damd64"
 472     else
 473       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_X86_ -Dx86"
 474     fi
 475     # If building with Visual Studio 2010, we can still use _STATIC_CPPLIB to
 476     # avoid bundling msvcpNNN.dll. Doesn't work with newer versions of visual
 477     # studio.
 478     if test "x$TOOLCHAIN_VERSION" = "x2010"; then
 479       CCXXFLAGS_JDK="$CCXXFLAGS_JDK \
 480           -D_STATIC_CPPLIB -D_DISABLE_DEPRECATE_STATIC_CPPLIB"
 481     fi
 482   fi
 483 
 484   ###############################################################################
 485 
 486   # Adjust flags according to debug level.
 487   case $DEBUG_LEVEL in
 488     fastdebug )
 489       CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
 490       CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
 491       C_O_FLAG_HI="$C_O_FLAG_NORM"
 492       C_O_FLAG_NORM="$C_O_FLAG_NORM"
 493       CXX_O_FLAG_HI="$CXX_O_FLAG_NORM"
 494       CXX_O_FLAG_NORM="$CXX_O_FLAG_NORM"
 495       JAVAC_FLAGS="$JAVAC_FLAGS -g"
 496       ;;
 497     slowdebug )
 498       CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
 499       CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
 500       C_O_FLAG_HI="$C_O_FLAG_NONE"
 501       C_O_FLAG_NORM="$C_O_FLAG_NONE"
 502       CXX_O_FLAG_HI="$CXX_O_FLAG_NONE"
 503       CXX_O_FLAG_NORM="$CXX_O_FLAG_NONE"
 504       JAVAC_FLAGS="$JAVAC_FLAGS -g"
 505       ;;
 506   esac
 507 
 508   # Setup LP64
 509   CCXXFLAGS_JDK="$CCXXFLAGS_JDK $ADD_LP64"
 510 
 511   # Set some common defines. These works for all compilers, but assume
 512   # -D is universally accepted.
 513 
 514   # Setup endianness
 515   if test "x$OPENJDK_TARGET_CPU_ENDIAN" = xlittle; then
 516     # The macro _LITTLE_ENDIAN needs to be defined the same to avoid the
 517     #   Sun C compiler warning message: warning: macro redefined: _LITTLE_ENDIAN
 518     #   (The Solaris X86 system defines this in file /usr/include/sys/isa_defs.h).
 519     #   Note: -Dmacro         is the same as    #define macro 1
 520     #         -Dmacro=        is the same as    #define macro
 521     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 522       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_LITTLE_ENDIAN="
 523     else
 524       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_LITTLE_ENDIAN"
 525     fi
 526   else
 527     # Same goes for _BIG_ENDIAN. Do we really need to set *ENDIAN on Solaris if they
 528     # are defined in the system?
 529     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 530       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_BIG_ENDIAN="
 531     else
 532       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_BIG_ENDIAN"
 533     fi
 534   fi
 535   
 536   # Setup target OS define. Use OS target name but in upper case.
 537   OPENJDK_TARGET_OS_UPPERCASE=`$ECHO $OPENJDK_TARGET_OS | $TR 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
 538   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D$OPENJDK_TARGET_OS_UPPERCASE"
 539 
 540   # Setup target CPU
 541   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DARCH='\"$OPENJDK_TARGET_CPU_LEGACY\"' -D$OPENJDK_TARGET_CPU_LEGACY"
 542   
 543   # Setup debug/release defines
 544   if test "x$DEBUG_LEVEL" = xrelease; then
 545     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DNDEBUG"
 546     if test "x$OPENJDK_TARGET_OS" = xsolaris; then
 547       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DTRIMMED"
 548     fi
 549   else
 550     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DDEBUG"
 551   fi
 552 
 553   # Setup release name
 554   CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DRELEASE='\"\$(RELEASE)\"'"
 555 
 556 
 557   # Set some additional per-OS defines.
 558   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 559     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_ALLBSD_SOURCE -D_DARWIN_UNLIMITED_SELECT"
 560   elif test "x$OPENJDK_TARGET_OS" = xaix; then
 561     # FIXME: PPC64 should not be here.
 562     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DPPC64"
 563   elif test "x$OPENJDK_TARGET_OS" = xbsd; then
 564     CCXXFLAGS_JDK="$CCXXFLAGS_JDK -D_ALLBSD_SOURCE"
 565   fi
 566 
 567   # Additional macosx handling
 568   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 569     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 570       # FIXME: This needs to be exported in spec.gmk due to closed legacy code.
 571       # FIXME: clean this up, and/or move it elsewhere.
 572 
 573       # Setting these parameters makes it an error to link to macosx APIs that are
 574       # newer than the given OS version and makes the linked binaries compatible 
 575       # even if built on a newer version of the OS.
 576       # The expected format is X.Y.Z
 577       MACOSX_VERSION_MIN=10.7.0
 578       AC_SUBST(MACOSX_VERSION_MIN)
 579     
 580       # The macro takes the version with no dots, ex: 1070
 581       # Let the flags variables get resolved in make for easier override on make
 582       # command line.
 583       CCXXFLAGS_JDK="$CCXXFLAGS_JDK -DMAC_OS_X_VERSION_MAX_ALLOWED=\$(subst .,,\$(MACOSX_VERSION_MIN)) -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
 584       LDFLAGS_JDK="$LDFLAGS_JDK -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
 585     fi
 586   fi
 587 
 588   # Setup some hard coded includes
 589   CCXXFLAGS_JDK="$CCXXFLAGS_JDK \
 590       -I${JDK_OUTPUTDIR}/include \
 591       -I${JDK_OUTPUTDIR}/include/$OPENJDK_TARGET_OS \
 592       -I${JDK_TOPDIR}/src/share/javavm/export \
 593       -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_EXPORT_DIR/javavm/export \
 594       -I${JDK_TOPDIR}/src/share/native/common \
 595       -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_API_DIR/native/common"
 596 
 597   # The shared libraries are compiled using the picflag.
 598   CFLAGS_JDKLIB="$CCXXFLAGS_JDK $CFLAGS_JDK $PICFLAG $CFLAGS_JDKLIB_EXTRA"
 599   CXXFLAGS_JDKLIB="$CCXXFLAGS_JDK $CXXFLAGS_JDK $PICFLAG $CXXFLAGS_JDKLIB_EXTRA "
 600 
 601   # Executable flags
 602   CFLAGS_JDKEXE="$CCXXFLAGS_JDK $CFLAGS_JDK"
 603   CXXFLAGS_JDKEXE="$CCXXFLAGS_JDK $CXXFLAGS_JDK"
 604 
 605   AC_SUBST(CFLAGS_JDKLIB)
 606   AC_SUBST(CFLAGS_JDKEXE)
 607   AC_SUBST(CXXFLAGS_JDKLIB)
 608   AC_SUBST(CXXFLAGS_JDKEXE)
 609 
 610   # Setup LDFLAGS et al.
 611   #
 612   # Now this is odd. The JDK native libraries have to link against libjvm.so
 613   # On 32-bit machines there is normally two distinct libjvm.so:s, client and server.
 614   # Which should we link to? Are we lucky enough that the binary api to the libjvm.so library
 615   # is identical for client and server? Yes. Which is picked at runtime (client or server)?
 616   # Neither, since the chosen libjvm.so has already been loaded by the launcher, all the following
 617   # libraries will link to whatever is in memory. Yuck.
 618   #
 619   # Thus we offer the compiler to find libjvm.so first in server then in client. It works. Ugh.
 620   if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
 621     LDFLAGS_JDK="$LDFLAGS_JDK -nologo -opt:ref -incremental:no"
 622     if test "x$OPENJDK_TARGET_CPU_BITS" = "x32"; then
 623       LDFLAGS_JDK="$LDFLAGS_JDK -safeseh"
 624     fi
 625     # TODO: make -debug optional "--disable-full-debug-symbols"
 626     LDFLAGS_JDK="$LDFLAGS_JDK -debug"
 627     LDFLAGS_JDKLIB="${LDFLAGS_JDK} -dll -libpath:${JDK_OUTPUTDIR}/lib"
 628     LDFLAGS_JDKLIB_SUFFIX=""
 629     if test "x$OPENJDK_TARGET_CPU_BITS" = "x64"; then
 630       LDFLAGS_STACK_SIZE=1048576
 631     else
 632       LDFLAGS_STACK_SIZE=327680
 633     fi
 634     LDFLAGS_JDKEXE="${LDFLAGS_JDK} /STACK:$LDFLAGS_STACK_SIZE"
 635   else
 636     if test "x$TOOLCHAIN_TYPE" = xgcc; then
 637       # If this is a --hash-style=gnu system, use --hash-style=both, why?
 638       # We have previously set HAS_GNU_HASH if this is the case
 639       if test -n "$HAS_GNU_HASH"; then
 640         LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker --hash-style=both "
 641       fi
 642       if test "x$OPENJDK_TARGET_OS" = xlinux; then
 643         # And since we now know that the linker is gnu, then add:
 644         #   -z defs, to forbid undefined symbols in object files
 645         #   -z noexecstack, to mark stack regions as non-executable
 646         LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -z -Xlinker defs -Xlinker -z -Xlinker noexecstack"
 647         if test "x$DEBUG_LEVEL" = "xrelease"; then
 648           # When building release libraries, tell the linker optimize them.
 649           # Should this be supplied to the OSS linker as well?
 650           LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -O1"
 651         fi
 652       fi
 653     fi
 654 
 655     if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 656       LDFLAGS_JDK="$LDFLAGS_JDK -z defs -xildoff -ztext"
 657       LDFLAGS_CXX_JDK="$LDFLAGS_CXX_JDK -norunpath -xnolib"
 658     fi
 659 
 660     LDFLAGS_JDKLIB="${LDFLAGS_JDK} $SHARED_LIBRARY_FLAGS \
 661         -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}"
 662 
 663     # On some platforms (mac) the linker warns about non existing -L dirs.
 664     # Add server first if available. Linking aginst client does not always produce the same results.
 665     # Only add client dir if client is being built. Add minimal (note not minimal1) if only building minimal1.
 666     # Default to server for other variants.
 667     if test "x$JVM_VARIANT_SERVER" = xtrue; then
 668       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
 669     elif test "x$JVM_VARIANT_CLIENT" = xtrue; then
 670       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/client"
 671     elif test "x$JVM_VARIANT_MINIMAL1" = xtrue; then
 672       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/minimal"
 673     else
 674       LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
 675     fi
 676 
 677     LDFLAGS_JDKLIB_SUFFIX="-ljava -ljvm"
 678     if test "x$TOOLCHAIN_TYPE" = xsolstudio; then
 679       LDFLAGS_JDKLIB_SUFFIX="$LDFLAGS_JDKLIB_SUFFIX -lc"
 680     fi
 681 
 682     LDFLAGS_JDKEXE="${LDFLAGS_JDK}"
 683     if test "x$OPENJDK_TARGET_OS" = xlinux; then
 684       LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE -Xlinker --allow-shlib-undefined"
 685     fi
 686   fi
 687   AC_SUBST(LDFLAGS_JDKLIB)
 688   AC_SUBST(LDFLAGS_JDKEXE)
 689   AC_SUBST(LDFLAGS_JDKLIB_SUFFIX)
 690   AC_SUBST(LDFLAGS_JDKEXE_SUFFIX)
 691   AC_SUBST(LDFLAGS_CXX_JDK)
 692 ])
 693 
 694 
 695 # FLAGS_C_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
 696 #                                  [RUN-IF-FALSE])
 697 # ------------------------------------------------------------
 698 # Check that the C compiler supports an argument
 699 AC_DEFUN([FLAGS_C_COMPILER_CHECK_ARGUMENTS],
 700 [
 701   AC_MSG_CHECKING([if the C compiler supports "$1"])
 702   supports=yes
 703 
 704   saved_cflags="$CFLAGS"
 705   CFLAGS="$CFLAGS $1"
 706   AC_LANG_PUSH([C])
 707   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
 708       [supports=no])
 709   AC_LANG_POP([C])
 710   CFLAGS="$saved_cflags"
 711 
 712   AC_MSG_RESULT([$supports])
 713   if test "x$supports" = "xyes" ; then
 714     m4_ifval([$2], [$2], [:])
 715   else
 716     m4_ifval([$3], [$3], [:])
 717   fi
 718 ])
 719 
 720 # FLAGS_CXX_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
 721 #                                    [RUN-IF-FALSE])
 722 # ------------------------------------------------------------
 723 # Check that the C++ compiler supports an argument
 724 AC_DEFUN([FLAGS_CXX_COMPILER_CHECK_ARGUMENTS],
 725 [
 726   AC_MSG_CHECKING([if the C++ compiler supports "$1"])
 727   supports=yes
 728 
 729   saved_cxxflags="$CXXFLAGS"
 730   CXXFLAGS="$CXXFLAG $1"
 731   AC_LANG_PUSH([C++])
 732   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
 733       [supports=no])
 734   AC_LANG_POP([C++])
 735   CXXFLAGS="$saved_cxxflags"
 736   
 737   AC_MSG_RESULT([$supports])
 738   if test "x$supports" = "xyes" ; then
 739     m4_ifval([$2], [$2], [:])
 740   else
 741     m4_ifval([$3], [$3], [:])
 742   fi
 743 ])
 744 
 745 # FLAGS_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
 746 #                                [RUN-IF-FALSE])
 747 # ------------------------------------------------------------
 748 # Check that the C and C++ compilers support an argument
 749 AC_DEFUN([FLAGS_COMPILER_CHECK_ARGUMENTS],
 750 [
 751   FLAGS_C_COMPILER_CHECK_ARGUMENTS([$1],
 752                        [C_COMP_SUPPORTS="yes"],
 753                        [C_COMP_SUPPORTS="no"])
 754   FLAGS_CXX_COMPILER_CHECK_ARGUMENTS([$1],
 755                      [CXX_COMP_SUPPORTS="yes"],
 756                      [CXX_COMP_SUPPORTS="no"])
 757 
 758   AC_MSG_CHECKING([if both compilers support "$1"])
 759   supports=no
 760   if test "x$C_COMP_SUPPORTS" = "xyes" -a "x$CXX_COMP_SUPPORTS" = "xyes"; then supports=yes; fi
 761   
 762   AC_MSG_RESULT([$supports])
 763   if test "x$supports" = "xyes" ; then
 764     m4_ifval([$2], [$2], [:])
 765   else
 766     m4_ifval([$3], [$3], [:])
 767   fi
 768 ])
 769 
 770 AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_MISC],
 771 [
 772   # Some Zero and Shark settings.
 773   # ZERO_ARCHFLAG tells the compiler which mode to build for
 774   case "${OPENJDK_TARGET_CPU}" in
 775     s390)
 776       ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}31"
 777       ;;
 778     *)
 779       ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"
 780   esac
 781   FLAGS_COMPILER_CHECK_ARGUMENTS([$ZERO_ARCHFLAG], [], [ZERO_ARCHFLAG=""])
 782   AC_SUBST(ZERO_ARCHFLAG)
 783 
 784   # Check that the compiler supports -mX (or -qX on AIX) flags
 785   # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does
 786   FLAGS_COMPILER_CHECK_ARGUMENTS([${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}],
 787       [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],
 788       [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
 789   AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)
 790 ])
 791 
 792 AC_DEFUN_ONCE([FLAGS_SETUP_GCC6_COMPILER_FLAGS],
 793 [
 794   # These flags are required for GCC 6 builds as undefined behaviour in OpenJDK code
 795   # runs afoul of the more aggressive versions of these optimisations.
 796   # Notably, value range propagation now assumes that the this pointer of C++
 797   # member functions is non-null.
 798   NO_DELETE_NULL_POINTER_CHECKS_CFLAG="-fno-delete-null-pointer-checks"
 799   FLAGS_COMPILER_CHECK_ARGUMENTS([$NO_DELETE_NULL_POINTER_CHECKS_CFLAG -Werror],
 800                                      [], [NO_DELETE_NULL_POINTER_CHECKS_CFLAG=""])
 801   AC_SUBST([NO_DELETE_NULL_POINTER_CHECKS_CFLAG])
 802   NO_LIFETIME_DSE_CFLAG="-fno-lifetime-dse"
 803   FLAGS_COMPILER_CHECK_ARGUMENTS([$NO_LIFETIME_DSE_CFLAG -Werror],
 804                                      [], [NO_LIFETIME_DSE_CFLAG=""])
 805   CFLAGS_JDK="${CFLAGS_JDK} ${NO_DELETE_NULL_POINTER_CHECKS_CFLAG} ${NO_LIFETIME_DSE_CFLAG}"
 806   AC_SUBST([NO_LIFETIME_DSE_CFLAG])
 807 ])
 808