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Link with -rdynamic instead of -Wl,-export-dynamic.
[oota-llvm.git] / autoconf / configure.ac
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 7d0f9f1aa1fd665e920a7c7816b516747c4414a4..5be25af2adf2a2d7b98779b6fb41fca9a8ca7bb3 100644 (file)
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -31,9 +31,9 @@ dnl===
 dnl===-----------------------------------------------------------------------===
 dnl Initialize autoconf and define the package name, version number and
 dnl address for reporting bugs.
 dnl===-----------------------------------------------------------------------===
 dnl Initialize autoconf and define the package name, version number and
 dnl address for reporting bugs.
-AC_INIT([LLVM],[3.3svn],[http://llvm.org/bugs/])
+AC_INIT([LLVM],[3.4svn],[http://llvm.org/bugs/])
 AC_DEFINE([LLVM_VERSION_MAJOR], [3], [Major version of the LLVM API])
 AC_DEFINE([LLVM_VERSION_MAJOR], [3], [Major version of the LLVM API])
-AC_DEFINE([LLVM_VERSION_MINOR], [3], [Minor version of the LLVM API])
+AC_DEFINE([LLVM_VERSION_MINOR], [4], [Minor version of the LLVM API])
 
 dnl Provide a copyright substitution and ensure the copyright notice is included
 dnl in the output of --version option of the generated configure script.
 
 dnl Provide a copyright substitution and ensure the copyright notice is included
 dnl in the output of --version option of the generated configure script.
@@ -59,6 +59,11 @@ if test ${srcdir} != "." ; then
   fi
 fi
 
   fi
 fi
 
+dnl Default to empty (i.e. assigning the null string to) CFLAGS and CXXFLAGS,
+dnl instead of the autoconf default (for example, '-g -O2' for CC=gcc).
+${CFLAGS=}
+${CXXFLAGS=}
+
 dnl We need to check for the compiler up here to avoid anything else
 dnl starting with a different one.
 AC_PROG_CC(clang llvm-gcc gcc)
 dnl We need to check for the compiler up here to avoid anything else
 dnl starting with a different one.
 AC_PROG_CC(clang llvm-gcc gcc)
@@ -217,11 +222,16 @@ AC_CACHE_CHECK([type of operating system we're going to host on],
     llvm_cv_no_link_all_option="-Wl,-noall_load"
     llvm_cv_os_type="Minix"
     llvm_cv_platform_type="Unix" ;;
     llvm_cv_no_link_all_option="-Wl,-noall_load"
     llvm_cv_os_type="Minix"
     llvm_cv_platform_type="Unix" ;;
-  *-*-freebsd* | *-*-kfreebsd-gnu)
+  *-*-freebsd*)
     llvm_cv_link_all_option="-Wl,--whole-archive"
     llvm_cv_no_link_all_option="-Wl,--no-whole-archive"
     llvm_cv_os_type="FreeBSD"
     llvm_cv_platform_type="Unix" ;;
     llvm_cv_link_all_option="-Wl,--whole-archive"
     llvm_cv_no_link_all_option="-Wl,--no-whole-archive"
     llvm_cv_os_type="FreeBSD"
     llvm_cv_platform_type="Unix" ;;
+  *-*-kfreebsd-gnu)
+    llvm_cv_link_all_option="-Wl,--whole-archive"
+    llvm_cv_no_link_all_option="-Wl,--no-whole-archive"
+    llvm_cv_os_type="GNU/kFreeBSD"
+    llvm_cv_platform_type="Unix" ;;
   *-*-openbsd*)
     llvm_cv_link_all_option="-Wl,--whole-archive"
     llvm_cv_no_link_all_option="-Wl,--no-whole-archive"
   *-*-openbsd*)
     llvm_cv_link_all_option="-Wl,--whole-archive"
     llvm_cv_no_link_all_option="-Wl,--no-whole-archive"
@@ -312,8 +322,10 @@ AC_CACHE_CHECK([type of operating system we're going to target],
     llvm_cv_target_os_type="Darwin" ;;
   *-*-minix*)
     llvm_cv_target_os_type="Minix" ;;
     llvm_cv_target_os_type="Darwin" ;;
   *-*-minix*)
     llvm_cv_target_os_type="Minix" ;;
-  *-*-freebsd* | *-*-kfreebsd-gnu)
+  *-*-freebsd*)
     llvm_cv_target_os_type="FreeBSD" ;;
     llvm_cv_target_os_type="FreeBSD" ;;
+  *-*-kfreebsd-gnu)
+    llvm_cv_target_os_type="GNU/kFreeBSD" ;;
   *-*-openbsd*)
     llvm_cv_target_os_type="OpenBSD" ;;
   *-*-netbsd*)
   *-*-openbsd*)
     llvm_cv_target_os_type="OpenBSD" ;;
   *-*-netbsd*)
@@ -389,13 +401,14 @@ AC_CACHE_CHECK([target architecture],[llvm_cv_target_arch],
   sparc*-*)               llvm_cv_target_arch="Sparc" ;;
   powerpc*-*)             llvm_cv_target_arch="PowerPC" ;;
   arm*-*)                 llvm_cv_target_arch="ARM" ;;
   sparc*-*)               llvm_cv_target_arch="Sparc" ;;
   powerpc*-*)             llvm_cv_target_arch="PowerPC" ;;
   arm*-*)                 llvm_cv_target_arch="ARM" ;;
+  aarch64*-*)             llvm_cv_target_arch="AArch64" ;;
   mips-* | mips64-*)      llvm_cv_target_arch="Mips" ;;
   mipsel-* | mips64el-*)  llvm_cv_target_arch="Mips" ;;
   xcore-*)                llvm_cv_target_arch="XCore" ;;
   msp430-*)               llvm_cv_target_arch="MSP430" ;;
   hexagon-*)              llvm_cv_target_arch="Hexagon" ;;
   mips-* | mips64-*)      llvm_cv_target_arch="Mips" ;;
   mipsel-* | mips64el-*)  llvm_cv_target_arch="Mips" ;;
   xcore-*)                llvm_cv_target_arch="XCore" ;;
   msp430-*)               llvm_cv_target_arch="MSP430" ;;
   hexagon-*)              llvm_cv_target_arch="Hexagon" ;;
-  mblaze-*)               llvm_cv_target_arch="MBlaze" ;;
   nvptx-*)                llvm_cv_target_arch="NVPTX" ;;
   nvptx-*)                llvm_cv_target_arch="NVPTX" ;;
+  s390x-*)                llvm_cv_target_arch="SystemZ" ;;
   *)                      llvm_cv_target_arch="Unknown" ;;
 esac])
 
   *)                      llvm_cv_target_arch="Unknown" ;;
 esac])
 
@@ -422,12 +435,13 @@ case $host in
   sparc*-*)               host_arch="Sparc" ;;
   powerpc*-*)             host_arch="PowerPC" ;;
   arm*-*)                 host_arch="ARM" ;;
   sparc*-*)               host_arch="Sparc" ;;
   powerpc*-*)             host_arch="PowerPC" ;;
   arm*-*)                 host_arch="ARM" ;;
+  aarch64*-*)             host_arch="AArch64" ;;
   mips-* | mips64-*)      host_arch="Mips" ;;
   mipsel-* | mips64el-*)  host_arch="Mips" ;;
   xcore-*)                host_arch="XCore" ;;
   msp430-*)               host_arch="MSP430" ;;
   hexagon-*)              host_arch="Hexagon" ;;
   mips-* | mips64-*)      host_arch="Mips" ;;
   mipsel-* | mips64el-*)  host_arch="Mips" ;;
   xcore-*)                host_arch="XCore" ;;
   msp430-*)               host_arch="MSP430" ;;
   hexagon-*)              host_arch="Hexagon" ;;
-  mblaze-*)               host_arch="MBlaze" ;;
+  s390x-*)                host_arch="SystemZ" ;;
   *)                      host_arch="Unknown" ;;
 esac
 
   *)                      host_arch="Unknown" ;;
 esac
 
@@ -501,6 +515,19 @@ case "$enableval" in
   *) AC_MSG_ERROR([Invalid setting for --enable-cxx11. Use "yes" or "no"]) ;;
 esac
 
   *) AC_MSG_ERROR([Invalid setting for --enable-cxx11. Use "yes" or "no"]) ;;
 esac
 
+dnl --enable-fission : check whether or not to use -gsplit-dwarf on the command
+dnl line
+AC_ARG_ENABLE(split-dwarf,
+              AS_HELP_STRING([--enable-split-dwarf],
+                             [Use split-dwarf if available (default is NO)]),,
+                             enableval=default)
+case "$enableval" in
+  yes) AC_SUBST(ENABLE_SPLIT_DWARF,[1]) ;;
+  no)  AC_SUBST(ENABLE_SPLIT_DWARF,[0]) ;;
+  default) AC_SUBST(ENABLE_SPLIT_DWARF,[0]);;
+  *) AC_MSG_ERROR([Invalid setting for --enable-split-dwarf. Use "yes" or "no"]) ;;
+esac
+
 dnl --enable-clang-arcmt: check whether to enable clang arcmt
 clang_arcmt="yes"
 AC_ARG_ENABLE(clang-arcmt,
 dnl --enable-clang-arcmt: check whether to enable clang arcmt
 clang_arcmt="yes"
 AC_ARG_ENABLE(clang-arcmt,
@@ -640,12 +667,13 @@ else
     PowerPC)     AC_SUBST(TARGET_HAS_JIT,1) ;;
     x86_64)      AC_SUBST(TARGET_HAS_JIT,1) ;;
     ARM)         AC_SUBST(TARGET_HAS_JIT,1) ;;
     PowerPC)     AC_SUBST(TARGET_HAS_JIT,1) ;;
     x86_64)      AC_SUBST(TARGET_HAS_JIT,1) ;;
     ARM)         AC_SUBST(TARGET_HAS_JIT,1) ;;
+    AArch64)     AC_SUBST(TARGET_HAS_JIT,0) ;;
     Mips)        AC_SUBST(TARGET_HAS_JIT,1) ;;
     XCore)       AC_SUBST(TARGET_HAS_JIT,0) ;;
     MSP430)      AC_SUBST(TARGET_HAS_JIT,0) ;;
     Hexagon)     AC_SUBST(TARGET_HAS_JIT,0) ;;
     Mips)        AC_SUBST(TARGET_HAS_JIT,1) ;;
     XCore)       AC_SUBST(TARGET_HAS_JIT,0) ;;
     MSP430)      AC_SUBST(TARGET_HAS_JIT,0) ;;
     Hexagon)     AC_SUBST(TARGET_HAS_JIT,0) ;;
-    MBlaze)      AC_SUBST(TARGET_HAS_JIT,0) ;;
     NVPTX)       AC_SUBST(TARGET_HAS_JIT,0) ;;
     NVPTX)       AC_SUBST(TARGET_HAS_JIT,0) ;;
+    SystemZ)     AC_SUBST(TARGET_HAS_JIT,1) ;;
     *)           AC_SUBST(TARGET_HAS_JIT,0) ;;
   esac
 fi
     *)           AC_SUBST(TARGET_HAS_JIT,0) ;;
   esac
 fi
@@ -700,6 +728,21 @@ case "$enableval" in
   *) AC_MSG_ERROR([Invalid setting for --enable-pthreads. Use "yes" or "no"]) ;;
 esac
 
   *) AC_MSG_ERROR([Invalid setting for --enable-pthreads. Use "yes" or "no"]) ;;
 esac
 
+dnl Allow disablement of zlib
+AC_ARG_ENABLE(zlib,
+              AS_HELP_STRING([--enable-zlib],
+                             [Use zlib for compression/decompression if
+                              available (default is YES)]),,
+                              enableval=default)
+case "$enableval" in
+  yes) AC_SUBST(LLVM_ENABLE_ZLIB,[1]) ;;
+  no)  AC_SUBST(LLVM_ENABLE_ZLIB,[0]) ;;
+  default) AC_SUBST(LLVM_ENABLE_ZLIB,[1]) ;;
+  *) AC_MSG_ERROR([Invalid setting for --enable-zlib. Use "yes" or "no"]) ;;
+esac
+AC_DEFINE_UNQUOTED([LLVM_ENABLE_ZLIB],$LLVM_ENABLE_ZLIB,
+                   [Define if zlib is enabled])
+
 dnl Allow building without position independent code
 AC_ARG_ENABLE(pic,
   AS_HELP_STRING([--enable-pic],
 dnl Allow building without position independent code
 AC_ARG_ENABLE(pic,
   AS_HELP_STRING([--enable-pic],
@@ -771,20 +814,21 @@ dnl Allow specific targets to be specified for building (or not)
 TARGETS_TO_BUILD=""
 AC_ARG_ENABLE([targets],AS_HELP_STRING([--enable-targets],
     [Build specific host targets: all or target1,target2,... Valid targets are:
 TARGETS_TO_BUILD=""
 AC_ARG_ENABLE([targets],AS_HELP_STRING([--enable-targets],
     [Build specific host targets: all or target1,target2,... Valid targets are:
-     host, x86, x86_64, sparc, powerpc, arm, mips, hexagon,
-     xcore, msp430, nvptx, and cpp (default=all)]),,
+     host, x86, x86_64, sparc, powerpc, arm, aarch64, mips, hexagon,
+     xcore, msp430, nvptx, systemz, r600, and cpp (default=all)]),,
     enableval=all)
 if test "$enableval" = host-only ; then
   enableval=host
 fi
 case "$enableval" in
     enableval=all)
 if test "$enableval" = host-only ; then
   enableval=host
 fi
 case "$enableval" in
-  all) TARGETS_TO_BUILD="X86 Sparc PowerPC ARM Mips XCore MSP430 CppBackend MBlaze NVPTX Hexagon" ;;
+  all) TARGETS_TO_BUILD="X86 Sparc PowerPC AArch64 ARM Mips XCore MSP430 CppBackend NVPTX Hexagon SystemZ R600" ;;
   *)for a_target in `echo $enableval|sed -e 's/,/ /g' ` ; do
       case "$a_target" in
         x86)      TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
         x86_64)   TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
         sparc)    TARGETS_TO_BUILD="Sparc $TARGETS_TO_BUILD" ;;
         powerpc)  TARGETS_TO_BUILD="PowerPC $TARGETS_TO_BUILD" ;;
   *)for a_target in `echo $enableval|sed -e 's/,/ /g' ` ; do
       case "$a_target" in
         x86)      TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
         x86_64)   TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
         sparc)    TARGETS_TO_BUILD="Sparc $TARGETS_TO_BUILD" ;;
         powerpc)  TARGETS_TO_BUILD="PowerPC $TARGETS_TO_BUILD" ;;
+        aarch64)  TARGETS_TO_BUILD="AArch64 $TARGETS_TO_BUILD" ;;
         arm)      TARGETS_TO_BUILD="ARM $TARGETS_TO_BUILD" ;;
         mips)     TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
         mipsel)   TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
         arm)      TARGETS_TO_BUILD="ARM $TARGETS_TO_BUILD" ;;
         mips)     TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
         mipsel)   TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
@@ -794,20 +838,22 @@ case "$enableval" in
         msp430)   TARGETS_TO_BUILD="MSP430 $TARGETS_TO_BUILD" ;;
         cpp)      TARGETS_TO_BUILD="CppBackend $TARGETS_TO_BUILD" ;;
         hexagon)  TARGETS_TO_BUILD="Hexagon $TARGETS_TO_BUILD" ;;
         msp430)   TARGETS_TO_BUILD="MSP430 $TARGETS_TO_BUILD" ;;
         cpp)      TARGETS_TO_BUILD="CppBackend $TARGETS_TO_BUILD" ;;
         hexagon)  TARGETS_TO_BUILD="Hexagon $TARGETS_TO_BUILD" ;;
-        mblaze)   TARGETS_TO_BUILD="MBlaze $TARGETS_TO_BUILD" ;;
         nvptx)    TARGETS_TO_BUILD="NVPTX $TARGETS_TO_BUILD" ;;
         nvptx)    TARGETS_TO_BUILD="NVPTX $TARGETS_TO_BUILD" ;;
+        systemz)  TARGETS_TO_BUILD="SystemZ $TARGETS_TO_BUILD" ;;
+        r600)     TARGETS_TO_BUILD="R600 $TARGETS_TO_BUILD" ;;
         host) case "$llvm_cv_target_arch" in
             x86)         TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
             x86_64)      TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
             Sparc)       TARGETS_TO_BUILD="Sparc $TARGETS_TO_BUILD" ;;
             PowerPC)     TARGETS_TO_BUILD="PowerPC $TARGETS_TO_BUILD" ;;
         host) case "$llvm_cv_target_arch" in
             x86)         TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
             x86_64)      TARGETS_TO_BUILD="X86 $TARGETS_TO_BUILD" ;;
             Sparc)       TARGETS_TO_BUILD="Sparc $TARGETS_TO_BUILD" ;;
             PowerPC)     TARGETS_TO_BUILD="PowerPC $TARGETS_TO_BUILD" ;;
+            AArch64)     TARGETS_TO_BUILD="AArch64 $TARGETS_TO_BUILD" ;;
             ARM)         TARGETS_TO_BUILD="ARM $TARGETS_TO_BUILD" ;;
             Mips)        TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
             ARM)         TARGETS_TO_BUILD="ARM $TARGETS_TO_BUILD" ;;
             Mips)        TARGETS_TO_BUILD="Mips $TARGETS_TO_BUILD" ;;
-            MBlaze)      TARGETS_TO_BUILD="MBlaze $TARGETS_TO_BUILD" ;;
             XCore)       TARGETS_TO_BUILD="XCore $TARGETS_TO_BUILD" ;;
             MSP430)      TARGETS_TO_BUILD="MSP430 $TARGETS_TO_BUILD" ;;
             Hexagon)     TARGETS_TO_BUILD="Hexagon $TARGETS_TO_BUILD" ;;
             NVPTX)       TARGETS_TO_BUILD="NVPTX $TARGETS_TO_BUILD" ;;
             XCore)       TARGETS_TO_BUILD="XCore $TARGETS_TO_BUILD" ;;
             MSP430)      TARGETS_TO_BUILD="MSP430 $TARGETS_TO_BUILD" ;;
             Hexagon)     TARGETS_TO_BUILD="Hexagon $TARGETS_TO_BUILD" ;;
             NVPTX)       TARGETS_TO_BUILD="NVPTX $TARGETS_TO_BUILD" ;;
+            SystemZ)     TARGETS_TO_BUILD="SystemZ $TARGETS_TO_BUILD" ;;
             *)       AC_MSG_ERROR([Can not set target to build]) ;;
           esac ;;
         *) AC_MSG_ERROR([Unrecognized target $a_target]) ;;
             *)       AC_MSG_ERROR([Can not set target to build]) ;;
           esac ;;
         *) AC_MSG_ERROR([Unrecognized target $a_target]) ;;
@@ -1149,15 +1195,15 @@ if test "$DOTTY" != "echo dotty" ; then
   AC_DEFINE_UNQUOTED([LLVM_PATH_DOTTY],"$DOTTY${EXEEXT}",
    [Define to path to dotty program if found or 'echo dotty' otherwise])
 fi
   AC_DEFINE_UNQUOTED([LLVM_PATH_DOTTY],"$DOTTY${EXEEXT}",
    [Define to path to dotty program if found or 'echo dotty' otherwise])
 fi
-AC_PATH_PROG(XDOT_PY, [xdot.py], [echo xdot.py])
-if test "$XDOT_PY" != "echo xdot.py" ; then
-  AC_DEFINE([HAVE_XDOT_PY],[1],[Define if the xdot.py program is available])
+AC_PATH_PROGS(XDOT, [xdot xdot.py], [echo xdot])
+if test "$XDOT" != "echo xdot" ; then
+  AC_DEFINE([HAVE_XDOT],[1],[Define if the xdot program is available])
   dnl If we're targeting for mingw we should emit windows paths, not msys
   if test "$llvm_cv_os_type" = "MingW" ; then
   dnl If we're targeting for mingw we should emit windows paths, not msys
   if test "$llvm_cv_os_type" = "MingW" ; then
-    XDOT_PY=`echo $XDOT_PY | sed 's/^\/\([[A-Za-z]]\)\//\1:\//' `
+    XDOT=`echo $XDOT | sed 's/^\/\([[A-Za-z]]\)\//\1:\//' `
   fi
   fi
-  AC_DEFINE_UNQUOTED([LLVM_PATH_XDOT_PY],"$XDOT_PY${EXEEXT}",
-   [Define to path to xdot.py program if found or 'echo xdot.py' otherwise])
+  AC_DEFINE_UNQUOTED([LLVM_PATH_XDOT],"$XDOT${EXEEXT}",
+   [Define to path to xdot program if found or 'echo xdot' otherwise])
 fi
 
 dnl Find the install program
 fi
 
 dnl Find the install program
@@ -1193,7 +1239,7 @@ AC_LINK_GET_VERSION
 dnl Determine whether the linker supports the -R option.
 AC_LINK_USE_R
 
 dnl Determine whether the linker supports the -R option.
 AC_LINK_USE_R
 
-dnl Determine whether the linker supports the -export-dynamic option.
+dnl Determine whether the compiler supports the -rdynamic option.
 AC_LINK_EXPORT_DYNAMIC
 
 dnl Determine whether the linker supports the --version-script option.
 AC_LINK_EXPORT_DYNAMIC
 
 dnl Determine whether the linker supports the --version-script option.
@@ -1262,39 +1308,21 @@ AC_MSG_CHECKING([optional compiler flags])
 CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
 CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
 CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
 CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
 CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
 CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
+
 dnl GCC's potential uninitialized use analysis is weak and presents lots of
 dnl false positives, so disable it.
 dnl GCC's potential uninitialized use analysis is weak and presents lots of
 dnl false positives, so disable it.
+NO_UNINITIALIZED=
+NO_MAYBE_UNINITIALIZED=
 if test "$GXX" = "yes"
 then
   CXX_FLAG_CHECK(NO_MAYBE_UNINITIALIZED, [-Wno-maybe-uninitialized])
   dnl gcc 4.7 introduced -Wmaybe-uninitialized to distinguish cases which are
 if test "$GXX" = "yes"
 then
   CXX_FLAG_CHECK(NO_MAYBE_UNINITIALIZED, [-Wno-maybe-uninitialized])
   dnl gcc 4.7 introduced -Wmaybe-uninitialized to distinguish cases which are
-  dnl known to be uninitialized from cases which might be uninitialized.  We 
+  dnl known to be uninitialized from cases which might be uninitialized.  We
   dnl still want to catch the first kind of errors.
   dnl still want to catch the first kind of errors.
-  if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized"
+  if test -z "$NO_MAYBE_UNINITIALIZED"
   then
     CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
   then
     CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
-  else
-    dnl Some versions of gcc accept unsupported -W flags if there is
-    dnl no warning but stop with an error when a warning is
-    dnl encountered.  If this gcc is earlier than 4.7, just use
-    dnl -Wno-uninitialized.
-    gxx_version=`$CXX -dumpversion`
-    gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
-    gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
-    gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
-
-    if    test "$gxx_version_major" -ge "4" \
-       && test "$gxx_version_minor" -ge "7"; then
-      dnl AC_SUBST doesn't work with empty strings.
-      NO_UNINITIALIZED=
-    else
-      NO_MAYBE_UNINITIALIZED=
-      CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
-    fi
   fi
   fi
-else
-  NO_UNINITIALIZED=
-  NO_MAYBE_UNINITIALIZED=
 fi
 AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
 
 fi
 AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
 
@@ -1376,6 +1404,11 @@ if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
                  [Have pthread_getspecific]))
 fi
 
                  [Have pthread_getspecific]))
 fi
 
+dnl zlib is optional; used for compression/uncompression
+if test "$LLVM_ENABLE_ZLIB" -eq 1 ; then
+  AC_CHECK_LIB(z, compress2)
+fi
+
 dnl Allow extra x86-disassembler library
 AC_ARG_WITH(udis86,
   AS_HELP_STRING([--with-udis86=<path>],
 dnl Allow extra x86-disassembler library
 AC_ARG_WITH(udis86,
   AS_HELP_STRING([--with-udis86=<path>],
@@ -1495,13 +1528,17 @@ AC_HEADER_STAT
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
 
-AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
+AC_LANG_PUSH([C++])
+AC_CHECK_HEADERS([cxxabi.h])
+AC_LANG_POP([C++])
+AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h link.h])
 AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h termios.h unistd.h])
 AC_CHECK_HEADERS([malloc.h setjmp.h signal.h stdint.h termios.h unistd.h])
-AC_CHECK_HEADERS([utime.h windows.h])
+AC_CHECK_HEADERS([utime.h])
 AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h sys/uio.h])
 AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h sys/uio.h])
-AC_CHECK_HEADERS([sys/types.h sys/ioctl.h malloc/malloc.h mach/mach.h])
+AC_CHECK_HEADERS([sys/ioctl.h malloc/malloc.h mach/mach.h])
 AC_CHECK_HEADERS([valgrind/valgrind.h])
 AC_CHECK_HEADERS([fenv.h])
 AC_CHECK_HEADERS([valgrind/valgrind.h])
 AC_CHECK_HEADERS([fenv.h])
+AC_CHECK_DECLS([FE_ALL_EXCEPT, FE_INEXACT], [], [], [[#include <fenv.h>]])
 if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
   AC_CHECK_HEADERS(pthread.h,
                    AC_SUBST(HAVE_PTHREAD, 1),
 if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
   AC_CHECK_HEADERS(pthread.h,
                    AC_SUBST(HAVE_PTHREAD, 1),
@@ -1509,6 +1546,13 @@ if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
 else
   AC_SUBST(HAVE_PTHREAD, 0)
 fi
 else
   AC_SUBST(HAVE_PTHREAD, 0)
 fi
+if test "$LLVM_ENABLE_ZLIB" -eq 1 ; then
+  AC_CHECK_HEADERS(zlib.h,
+                   AC_SUBST(HAVE_LIBZ, 1),
+                   AC_SUBST(HAVE_LIBZ, 0))
+else
+  AC_SUBST(HAVE_LIBZ, 0)
+fi
 
 dnl Try to find ffi.h.
 if test "$llvm_cv_enable_libffi" = "yes" ; then
 
 dnl Try to find ffi.h.
 if test "$llvm_cv_enable_libffi" = "yes" ; then
@@ -1563,12 +1607,14 @@ dnl===-----------------------------------------------------------------------===
 
 AC_CHECK_FUNCS([backtrace ceilf floorf roundf rintf nearbyintf getcwd ])
 AC_CHECK_FUNCS([powf fmodf strtof round ])
 
 AC_CHECK_FUNCS([backtrace ceilf floorf roundf rintf nearbyintf getcwd ])
 AC_CHECK_FUNCS([powf fmodf strtof round ])
+AC_CHECK_FUNCS([log log2 log10 exp exp2])
 AC_CHECK_FUNCS([getpagesize getrusage getrlimit setrlimit gettimeofday ])
 AC_CHECK_FUNCS([isatty mkdtemp mkstemp ])
 AC_CHECK_FUNCS([getpagesize getrusage getrlimit setrlimit gettimeofday ])
 AC_CHECK_FUNCS([isatty mkdtemp mkstemp ])
-AC_CHECK_FUNCS([mktemp posix_spawn pread realpath sbrk setrlimit strdup ])
+AC_CHECK_FUNCS([mktemp posix_spawn pread realpath sbrk setrlimit ])
 AC_CHECK_FUNCS([strerror strerror_r setenv arc4random ])
 AC_CHECK_FUNCS([strtoll strtoq sysconf malloc_zone_statistics ])
 AC_CHECK_FUNCS([setjmp longjmp sigsetjmp siglongjmp writev])
 AC_CHECK_FUNCS([strerror strerror_r setenv arc4random ])
 AC_CHECK_FUNCS([strtoll strtoq sysconf malloc_zone_statistics ])
 AC_CHECK_FUNCS([setjmp longjmp sigsetjmp siglongjmp writev])
+AC_CHECK_FUNCS([futimes futimens])
 AC_C_PRINTF_A
 AC_FUNC_RAND48
 
 AC_C_PRINTF_A
 AC_FUNC_RAND48
 
@@ -1707,7 +1753,6 @@ if test "${prefix}" = "NONE" ; then
 fi
 eval LLVM_PREFIX="${prefix}";
 eval LLVM_BINDIR="${prefix}/bin";
 fi
 eval LLVM_PREFIX="${prefix}";
 eval LLVM_BINDIR="${prefix}/bin";
-eval LLVM_LIBDIR="${prefix}/lib";
 eval LLVM_DATADIR="${prefix}/share/llvm";
 eval LLVM_DOCSDIR="${prefix}/share/doc/llvm";
 eval LLVM_ETCDIR="${prefix}/etc/llvm";
 eval LLVM_DATADIR="${prefix}/share/llvm";
 eval LLVM_DOCSDIR="${prefix}/share/doc/llvm";
 eval LLVM_ETCDIR="${prefix}/etc/llvm";
@@ -1717,7 +1762,6 @@ eval LLVM_MANDIR="${prefix}/man";
 LLVM_CONFIGTIME=`date`
 AC_SUBST(LLVM_PREFIX)
 AC_SUBST(LLVM_BINDIR)
 LLVM_CONFIGTIME=`date`
 AC_SUBST(LLVM_PREFIX)
 AC_SUBST(LLVM_BINDIR)
-AC_SUBST(LLVM_LIBDIR)
 AC_SUBST(LLVM_DATADIR)
 AC_SUBST(LLVM_DOCSDIR)
 AC_SUBST(LLVM_ETCDIR)
 AC_SUBST(LLVM_DATADIR)
 AC_SUBST(LLVM_DOCSDIR)
 AC_SUBST(LLVM_ETCDIR)
@@ -1737,8 +1781,6 @@ AC_DEFINE_UNQUOTED(LLVM_PREFIX,"$LLVM_PREFIX",
                    [Installation prefix directory])
 AC_DEFINE_UNQUOTED(LLVM_BINDIR, "$LLVM_BINDIR",
                    [Installation directory for binary executables])
                    [Installation prefix directory])
 AC_DEFINE_UNQUOTED(LLVM_BINDIR, "$LLVM_BINDIR",
                    [Installation directory for binary executables])
-AC_DEFINE_UNQUOTED(LLVM_LIBDIR, "$LLVM_LIBDIR",
-                   [Installation directory for libraries])
 AC_DEFINE_UNQUOTED(LLVM_DATADIR, "$LLVM_DATADIR",
                    [Installation directory for data files])
 AC_DEFINE_UNQUOTED(LLVM_DOCSDIR, "$LLVM_DOCSDIR",
 AC_DEFINE_UNQUOTED(LLVM_DATADIR, "$LLVM_DATADIR",
                    [Installation directory for data files])
 AC_DEFINE_UNQUOTED(LLVM_DOCSDIR, "$LLVM_DOCSDIR",
@@ -1753,7 +1795,7 @@ AC_DEFINE_UNQUOTED(LLVM_MANDIR, "$LLVM_MANDIR",
                    [Installation directory for man pages])
 AC_DEFINE_UNQUOTED(LLVM_CONFIGTIME, "$LLVM_CONFIGTIME",
                    [Time at which LLVM was configured])
                    [Installation directory for man pages])
 AC_DEFINE_UNQUOTED(LLVM_CONFIGTIME, "$LLVM_CONFIGTIME",
                    [Time at which LLVM was configured])
-AC_DEFINE_UNQUOTED(LLVM_HOSTTRIPLE, "$host",
+AC_DEFINE_UNQUOTED(LLVM_HOST_TRIPLE, "$host",
                    [Host triple LLVM will be executed on])
 AC_DEFINE_UNQUOTED(LLVM_DEFAULT_TARGET_TRIPLE, "$target",
                    [Target triple LLVM will generate code for by default])
                    [Host triple LLVM will be executed on])
 AC_DEFINE_UNQUOTED(LLVM_DEFAULT_TARGET_TRIPLE, "$target",
                    [Target triple LLVM will generate code for by default])
@@ -1798,7 +1840,7 @@ for a_binding in $BINDINGS_TO_BUILD ; do
         AC_SUBST(OCAML_LIBDIR,$ocaml_stdlib)
       else
         # ocaml stdlib is outside our prefix; use libdir/ocaml
         AC_SUBST(OCAML_LIBDIR,$ocaml_stdlib)
       else
         # ocaml stdlib is outside our prefix; use libdir/ocaml
-        AC_SUBST(OCAML_LIBDIR,$LLVM_LIBDIR/ocaml)
+        AC_SUBST(OCAML_LIBDIR,${prefix}/lib/ocaml)
       fi
     fi
     ;;
       fi
     fi
     ;;
@@ -1821,7 +1863,7 @@ AC_SUBST(RPATH)
 
 dnl Determine linker rdynamic flag
 if test "$llvm_cv_link_use_export_dynamic" = "yes" ; then
 
 dnl Determine linker rdynamic flag
 if test "$llvm_cv_link_use_export_dynamic" = "yes" ; then
-  RDYNAMIC="-Wl,-export-dynamic"
+  RDYNAMIC="-rdynamic"
 else
   RDYNAMIC=""
 fi
 else
   RDYNAMIC=""
 fi
C/C++ LLVM-based compilers that forbids OOTA behaviors