add llvm configure flags to enable/disable target OSes/Envs

autoconf/configure.ac

 dnl === configure.ac --------------------------------------------------------===
 dnl                     The LLVM Compiler Infrastructure
 dnl
 dnl This file is distributed under the University of Illinois Open Source
 dnl License. See LICENSE.TXT for details.
 dnl
 dnl===-----------------------------------------------------------------------===
 dnl This is the LLVM configuration script. It is processed by the autoconf
 dnl program to produce a script named configure. This script contains the
 dnl configuration checks that LLVM needs in order to support multiple platforms.
@@ skipping 685 matching lines @@
   fi
   if test -f ${srcdir}/lib/Target/${target_to_build}/Disassembler/Makefile ; then
     LLVM_ENUM_DISASSEMBLERS="LLVM_DISASSEMBLER($target_to_build) $LLVM_ENUM_DISASSEMBLERS";
   fi
 done
 AC_SUBST(LLVM_ENUM_TARGETS)
 AC_SUBST(LLVM_ENUM_ASM_PRINTERS)
 AC_SUBST(LLVM_ENUM_ASM_PARSERS)
 AC_SUBST(LLVM_ENUM_DISASSEMBLERS)
 
+dnl Allow specific target OSes to be supported in the build (or not).
+TARGET_OSES_TO_BUILD=""
+AC_ARG_ENABLE([target-oses],AS_HELP_STRING([--enable-target-oses],
+    [Build specific target OSes: all or target_os1,target_os2,...
+     Valid targets are:
+     host, AuroraUX, Cygwin, Darwin, DragonFly, Freebsd, IOS, KFreeBSD, Linux,
+     Lv2, MacOSX, MinGW32, NetBSD, OpenBSD, Psp, Solaris, Win32, Haiku, Minix,
+     RTEMS, NativeClient, (default=all)]),,
+    enableval=all)
+if test "$enableval" = host-only ; then
+  enableval=host
+fi
+case "$enableval" in
+  all)
+    TARGET_OSES_TO_BUILD="AuroraUX Cygwin Darwin DragonFly FreeBSD IOS KFreeBSD Linux Lv2 MacOSX MinGW32 NetBSD OpenBSD Psp Solaris Win32 Haiku Minix RTEMS NativeClient" ;;
+  *)
+    for a_target in `echo $enableval | sed -e 's/,/ /g' ` ; do
+      case "$a_target" in
+        AuroraUX)  TARGET_OSES_TO_BUILD="AuroraUX $TARGET_OSES_TO_BUILD" ;;
+        Cygwin)    TARGET_OSES_TO_BUILD="Cygwin $TARGET_OSES_TO_BUILD" ;;
+        Darwin)    TARGET_OSES_TO_BUILD="Darwin $TARGET_OSES_TO_BUILD" ;;
+        DragonFly) TARGET_OSES_TO_BUILD="DragonFly $TARGET_OSES_TO_BUILD" ;;
+        FreeBSD)   TARGET_OSES_TO_BUILD="FreeBSD $TARGET_OSES_TO_BUILD" ;;
+        IOS)       TARGET_OSES_TO_BUILD="IOS $TARGET_OSES_TO_BUILD" ;;
+        KFreeBSD)  TARGET_OSES_TO_BUILD="KFreeBSD $TARGET_OSES_TO_BUILD" ;;
+        Linux)     TARGET_OSES_TO_BUILD="Linux $TARGET_OSES_TO_BUILD" ;;
+        Lv2)       TARGET_OSES_TO_BUILD="Lv2 $TARGET_OSES_TO_BUILD" ;;
+        MacOSX)    TARGET_OSES_TO_BUILD="MacOSX $TARGET_OSES_TO_BUILD" ;;
+        MinGW32)   TARGET_OSES_TO_BUILD="MinGW32 $TARGET_OSES_TO_BUILD" ;;
+        NetBSD)    TARGET_OSES_TO_BUILD="NetBSD $TARGET_OSES_TO_BUILD" ;;
+        OpenBSD)   TARGET_OSES_TO_BUILD="OpenBSD $TARGET_OSES_TO_BUILD" ;;
+        Psp)       TARGET_OSES_TO_BUILD="Psp $TARGET_OSES_TO_BUILD" ;;
+        Solaris)   TARGET_OSES_TO_BUILD="Solaris $TARGET_OSES_TO_BUILD" ;;
+        Win32)     TARGET_OSES_TO_BUILD="Win32 $TARGET_OSES_TO_BUILD" ;;
+        Haiku)     TARGET_OSES_TO_BUILD="Haiku $TARGET_OSES_TO_BUILD" ;;
+        Minix)     TARGET_OSES_TO_BUILD="Minix $TARGET_OSES_TO_BUILD" ;;
+        RTEMS)     TARGET_OSES_TO_BUILD="RTEMS $TARGET_OSES_TO_BUILD" ;;
+        NativeClient)
+          TARGET_OSES_TO_BUILD="NativeClient $TARGET_OSES_TO_BUILD" ;;
+        host)
+          case "$llvm_cv_os_type" in
+            AuroraUX)  TARGET_OSES_TO_BUILD="AuroraUX $TARGET_OSES_TO_BUILD" ;;
+            Cygwin)    TARGET_OSES_TO_BUILD="Cygwin $TARGET_OSES_TO_BUILD" ;;
+            Darwin)    TARGET_OSES_TO_BUILD="Darwin $TARGET_OSES_TO_BUILD" ;;
+            DragonFly) TARGET_OSES_TO_BUILD="DragonFly $TARGET_OSES_TO_BUILD" ;;
+            FreeBSD)   TARGET_OSES_TO_BUILD="FreeBSD $TARGET_OSES_TO_BUILD" ;;
+            IOS)       TARGET_OSES_TO_BUILD="IOS $TARGET_OSES_TO_BUILD" ;;
+            KFreeBSD)  TARGET_OSES_TO_BUILD="KFreeBSD $TARGET_OSES_TO_BUILD" ;;
+            Linux)     TARGET_OSES_TO_BUILD="Linux $TARGET_OSES_TO_BUILD" ;;
+            Lv2)       TARGET_OSES_TO_BUILD="Lv2 $TARGET_OSES_TO_BUILD" ;;
+            MacOSX)    TARGET_OSES_TO_BUILD="MacOSX $TARGET_OSES_TO_BUILD" ;;
+            MinGW32)   TARGET_OSES_TO_BUILD="MinGW32 $TARGET_OSES_TO_BUILD" ;;
+            NetBSD)    TARGET_OSES_TO_BUILD="NetBSD $TARGET_OSES_TO_BUILD" ;;
+            OpenBSD)   TARGET_OSES_TO_BUILD="OpenBSD $TARGET_OSES_TO_BUILD" ;;
+            Psp)       TARGET_OSES_TO_BUILD="Psp $TARGET_OSES_TO_BUILD" ;;
+            Solaris)   TARGET_OSES_TO_BUILD="Solaris $TARGET_OSES_TO_BUILD" ;;
+            Win32)     TARGET_OSES_TO_BUILD="Win32 $TARGET_OSES_TO_BUILD" ;;
+            Haiku)     TARGET_OSES_TO_BUILD="Haiku $TARGET_OSES_TO_BUILD" ;;
+            Minix)     TARGET_OSES_TO_BUILD="Minix $TARGET_OSES_TO_BUILD" ;;
+            RTEMS)     TARGET_OSES_TO_BUILD="RTEMS $TARGET_OSES_TO_BUILD" ;;
+            NativeClient)
+             TARGET_OSES_TO_BUILD="NativeClient $TARGET_OSES_TO_BUILD" ;;
+            *) AC_MSG_ERROR([Unrecognized target/host os $llvm_cv_os_type]) ;;
+          esac
+          ;;
+        *) AC_MSG_ERROR([Unrecognized target os $a_target]) ;;
+      esac
+    done
+  ;;
+esac
+AC_SUBST(TARGET_OSES_TO_BUILD,$TARGET_OSES_TO_BUILD)
+
+dnl Allow specific target environments to be supported in the build (or not).
+TARGET_ENVS_TO_BUILD=""
+AC_ARG_ENABLE([target-envs],AS_HELP_STRING([--enable-target-envs],
+    [Build specific target environments: all or target_env1,target_env2,...
+     Valid targets are:
+     eabi, gnueabi, gnu, macho, (default=all)]),,
+    enableval=all)
+case "$enableval" in
+  all)
+    TARGET_ENVS_TO_BUILD="eabi gnueabi gnu macho" ;;
+  *)
+    for a_target in `echo $enableval | sed -e 's/,/ /g' ` ; do
+      case "$a_target" in
+        eabi)    TARGET_ENVS_TO_BUILD="eabi $TARGET_ENVS_TO_BUILD" ;;
+        gnueabi) TARGET_ENVS_TO_BUILD="gnueabi $TARGET_ENVS_TO_BUILD" ;;
+        gnu)     TARGET_ENVS_TO_BUILD="gnu $TARGET_ENVS_TO_BUILD" ;;
+        macho)   TARGET_ENVS_TO_BUILD="macho $TARGET_ENVS_TO_BUILD" ;;
+        *) AC_MSG_ERROR([Unrecognized target environment $a_target]) ;;
+      esac
+    done
+  ;;
+esac
+AC_SUBST(TARGET_ENVS_TO_BUILD,$TARGET_ENVS_TO_BUILD)
+
 dnl Prevent the CBackend from using printf("%a") for floating point so older
 dnl C compilers that cannot deal with the 0x0p+0 hex floating point format
 dnl can still compile the CBE's output
 AC_ARG_ENABLE([cbe-printf-a],AS_HELP_STRING([--enable-cbe-printf-a],
   [Enable C Backend output with hex floating point via %a  (default is YES)]),,
   enableval=default)
 case "$enableval" in
   yes) AC_SUBST(ENABLE_CBE_PRINTF_A,[1]) ;;
   no)  AC_SUBST(ENABLE_CBE_PRINTF_A,[0]) ;;
   default)  AC_SUBST(ENABLE_CBE_PRINTF_A,[1]) ;;
@@ skipping 1056 matching lines @@
 AC_CONFIG_MAKEFILE(test/Makefile.tests)
 AC_CONFIG_MAKEFILE(unittests/Makefile)
 AC_CONFIG_MAKEFILE(tools/Makefile)
 AC_CONFIG_MAKEFILE(utils/Makefile)
 AC_CONFIG_MAKEFILE(projects/Makefile)
 AC_CONFIG_MAKEFILE(bindings/Makefile)
 AC_CONFIG_MAKEFILE(bindings/ocaml/Makefile.ocaml)
 
 dnl Finally, crank out the output
 AC_OUTPUT