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-[[!meta copyright="Copyright © 2011, 2012, 2013 Free Software Foundation,
-Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!tag open_issue_llvm]]
-
-Here's what's to be done for maintaining [[/LLVM]].
-
-Apart from the target-specific configuration machinery, there shouldn't be any
-major differences within LLVM between the GNU/Hurd and GNU/Linux ports, for
-example.  Especially all the compiler magic is all the same.
-
-[[!toc levels=2]]
-
-
-# [[General information|/llvm]]
-
-
-## Rebuild of the Debian archive with clang
-
-From [[!message-id "20120305195308.GA1904@zouish.org"]]:
-<http://sylvestre.ledru.info/blog/sylvestre/2012/02/29/rebuild_of_the_debian_archive_with_clang>,
-<http://clang.debian.net/>.
-
-
-# [[Sources|source_repositories/llvm]]
-
-
-# Configuration
-
-<!--
-
-For all of llvm, clang, compiler-rt, test-suite:
-
-git checkout reviewed
-git log --reverse --topo-order --pretty=fuller --stat=$COLUMNS,$COLUMNS -w -p -C --cc ..upstream/master
--i
-/^commit |^merge:|^---$|hurd|gnu|linux|nacl|nptl|glibc|[^e]gs:|/proc
-
--->
-
-Last reviewed up to the [[Git mirror's sources|source_repositories/llvm]]: llvm
-6f7becfe23f38e8c28e9422d883263974058aeed (2013-03-24), clang
-495cfa46300979642acde8d93a1f21c9291dac98 (2013-03-23), compiler-rt
-a06fe9183fbffb78798a444da9bc3040fdd444aa (2013-03-23), test-suite
-5a05572d268568fb15b48f374f9fc9f882adecd2 (2013-03-23).
-
-  * <http://anonscm.debian.org/viewvc/pkg-llvm/llvm/trunk/debian/patches/>.
-
-  * [low] Some more `PATH_MAX`/`MAXPATHLEN` things.
-
-  * `gs:` usage
-
-      * `lib/Target/X86/`, `test/CodeGen/X86/`, `test/MC/X86/`.
-
-      * `tools/clang/`
-
-            tools/clang/docs/LanguageExtensions.rst:          movl    %gs:(%eax), %eax
-            tools/clang/test/Sema/asm.c:  asm volatile ("movb %%gs:%P2,%b0" : "=q"(b) : "0"(0), "i"(5L));
-
-      * `compiler-rt` and `test-suite` not yet examined.
-
-  * [low] Linuxisms
-
-      * In some CMake files (`CMakeLists.txt`, for example).
-
-      * `test/`, `unittests`, `tools/clang/test/`, `tools/clang/unittests/` not
-        yet examined.
-
-          * In clang's `test/Driver/` a lot of testing can be generalized from
-            *Linux* to *GNU environment*, adding GNU/Hurd testing, too.
-
-      * LLVM commit 98fbe27ac8f0766ea94b89b8c03418131b72bea4 `Support for
-        HiPE-compatible code emission`
-
-        Only relevant for `CallingConv::HiPE`.
-
-            +  assert(ST->isTargetLinux() &&
-            +         "HiPE prologue is only supported on Linux operating systems.");
-
-      * `compiler-rt` and `test-suite` not yet examined.
-
-  * `/proc` usage
-
-      * `compiler-rt` and `test-suite` not yet examined.
-
-  * `libc++` (not currently using)
-
-    Some Hurd-porting work is said to have been done as Google Summer of Code
-    2012 Debian project,
-    <http://wiki.debian.org/SummerOfCode2012/StudentApplications/AndrejBelym>.
-
-  * [[sanitizers|_san]]
-
-    A lot of Linux-specific things.
-
-  * IRC, OFTC, #debian-hurd, 2013-09-05:
-
-        <gg0> how can this fix it on {kf,hurd}-i386?
-          http://anonscm.debian.org/viewvc/pkg-llvm/llvm-toolchain/branches/3.3/debian/patches/libstdc%2B%2B-header-i386.diff?view=markup&sortby=date&pathrev=830
-        <pinotree> what makes you think it does?
-        <pinotree> it fixes #714890, which has nothing to do with hurd or
-          kfreebsd
-        <gg0> i simple wouldn't add a patch that fixes it on one i386 arch
-          only, being aware there are others
-        <pinotree> meet sylvestre
-
-  * IRC, freenode, #hurd, 2013-09-05:
-
-        <pinotree> tschwinge: iirc you were working on llvm/clang, weren't you?
-        <tschwinge> pinotree: That's right.  I have patches to
-          follow-up/rework.  Stalled at the moment, as you probably already
-          guessed...  %-)
-        <pinotree> tschwinge: <Sylvestre> by the way, pinotree if you have time
-          for hurd stuff, I would be glad to have your help to port
-          llvm-toolchain-3.3 to hurd. I am having some issues with threading
-          aspects https://paste.debian.net/35466/
-        <pinotree> he's the debian packager of llvm
-        <tschwinge> That paste is for LLDB -- which I'd not assume to be in a
-          shape usable for Hurd.
-        <tschwinge> (I didn't look at it at all.)
-        <pinotree> tschwinge: if you look at the latest llvm-toolchain-3.3
-          debian source, there's a lldb-hurd.diff patch, which starts some
-          include header dance
-
-
-# Build
-
-Here's a log of a LLVM build run; this is from our [[Git repository's
-sources|source_repositories/llvm]], llvm
-dc218fb6ae3241f4b66e9bf2c9d6352efecc0a14 (2013-03-24), clang
-744290b5ecd48bddb4a6cf96d68cdc4a57e24e36 (2013-03-24), compiler-rt
-a06fe9183fbffb78798a444da9bc3040fdd444aa (2013-03-23), test-suite
-1821ab0ef1c73430705356fdfde3769460092382 (2013-03-24), run on
-kepler.SCHWINGE and coulomb.SCHWINGE.
-
-    $ export LC_ALL=C
-    $ (cd ../Horace_Silver/ && ln -sfn ../../../clang/tschwinge/Hank_Mobley tools/clang)
-    $ (cd ../Horace_Silver/ && ln -sfn ../../../compiler-rt/tschwinge/Doug_Watkins projects/compiler-rt)
-    $ (cd ../Horace_Silver/ && ln -sfn ../../../test-suite/tschwinge/Art_Blakey projects/test-suite)
-    $ ../Horace_Silver/configure --prefix="$PWD".install --enable-optimized SHELL=/bin/dash CC=gcc-4.7 CXX=g++-4.7 2>&1 | tee log_build
-    $ make VERBOSE=1 2>&1 | tee log_build_
-
-Different hosts may default to different shells and compiler versions; thus
-harmonized.
-
-Passing `--enable-debug-symbols`, the GNU/Hurd build on coulomb.SCHWINGE
-terminates with a SIGBUS
-when linking `Release+Debug+Asserts/bin/clang` (which is bigger than 500 MiB
-for the corresponding GNU/Linux build).  Using `--enable-debug-symbols
---enable-shared`, the GNU/Hurd build hang after `make[1]: Leaving directory
-[...]/tools/llvm-shlib`, after (successfully) linking
-`Release+Debug+Asserts/lib/libLLVM-3.3svn.so` (which is bigger than 250 MiB for
-the corresponding GNU/Linux build).  Also there is a separate
-`--enable-debug-runtime`.
-
-This takes up around 3.2 GiB, and needs roughly 1.5 h on kepler.SCHWINGE and
-5.25 h on coulomb.SCHWINGE.
-
-Configuring without `--enable-optimized` even crashes mighty darnassus,
-probably because of too-big files when linking.  Configuring with
-`--enable-optimized --enable-expensive-checks --disable-threads
---enable-debug-symbols --enable-debug-runtime` is fine.
-
-<!--
-
-    $ (make VERBOSE=1 && touch .go-install) 2>&1 | tee log_build_ && test -f .go-install && (make VERBOSE=1 install && touch .go-test) 2>&1 | tee log_install && test -f .go-test && { make -k VERBOSE=1 LIT_ARGS='-v --threads=1' check-all 2>&1 | tee log_test_check-all; make -k -C projects/test-suite/ 2>&1 | tee log_test_test-suite; }
-
-    $ (PATH=$HOME/tmp/source/autoconf/AUTOCONF-2.60.build.install/bin:$HOME/tmp/source/automake/automake-1.9.6.build.install/bin:$HOME/tmp/source/libtool/release-1-5-22.build.install/bin:$PATH; ./AutoRegen.sh)
-
--->
-
-
-## Analysis
-
-    $ toolchain/logs/process llvm build
-
-        -checking for mmap of files... yes
-        +checking for mmap of files... no
-         checking if /dev/zero is needed for mmap... no
-        +configure: WARNING: mmap() of files required but not found
-
-   Due to [[mmap_write-only]].
-
-        +In file included from [...]/lib/Support/Process.cpp:85:0:
-        +[...]/lib/Support/Unix/Process.inc: In function 'unsigned int getColumns(int)':
-        +[...]/lib/Support/Unix/Process.inc:227:21: warning: enumeral and non-enumeral type in conditional expression [enabled by default]
-
-           225    // Try to determine the width of the terminal.
-           226    struct winsize ws;
-           227    if (ioctl(FileID, TIOCGWINSZ, &ws) == 0)
-
-        include/llvm/Config/*
-        Makefile.config
-
-TODO
-
-
-# Install
-
-    $ make VERBOSE=1 install 2>&1 | tee log_install
-
-This takes up around 400 MiB, and needs roughly 1 min on kepler.SCHWINGE and 12
-min on coulomb.SCHWINGE.
-
-
-## Analysis
-
-    $ toolchain/logs/process llvm install
-
-TODO
-
-
-# Testsuite
-
-    $ make -k VERBOSE=1 LIT_ARGS='-v --threads=1' check-all 2>&1 | tee log_test_check-all
-    $ make -k -C projects/test-suite/ 2>&1 | tee log_test_test-suite
-
-`LIT_ARGS=-v` is default for `VERBOSE=1`, but we want only one worker thread,
-for stable order and usable test output log.
-
-This needs roughly 10 min (`check-all`) + 150 min (test-suite) = 160 min on
-kepler.SCHWINGE and 45 min (`check-all`) + 165 min (test-suite) = 210 min on
-coulomb.SCHWINGE.
-
-
-## Analysis
-
-    $ toolchain/logs/process llvm test
-
-  * `LLVM :: CodeGen/X86/mult-alt-generic-i686.ll`
-
-    This one, as well as a really large set of test from the test-suite fail on
-    coulomb.SCHWINGE no matter whether a GNU/Hurd or GNU/Linux system is booted
-    -- so all these are specific to the Athlon XP processor, hopefully.
-
-  * `Clang :: Index/crash-recovery-modules.m`
-
-    Also fails on GNU/Linux.  Tested `--enable-optimized
-    --enable-expensive-checks --disable-threads --enable-debug-symbols
-    --enable-debug-runtime`.  [[!LLVM_bug 11974]].
-
-  * `Clang :: Misc/dev-fd-fs.c`
-
-        $ cat < [...]/test/Misc/dev-fd-fs.c | Release+Debug+Asserts+Checks/bin/clang -x c /dev/fd/0 -E
-        clang: error: no such file or directory: '/dev/fd/0'
-        clang: error: no input files
-
-    Compare to:
-
-        $ cat < [...]/test/Misc/dev-fd-fs.c | gcc -x c /dev/fd/0 -E
-        gcc: error: /dev/fd/0: (ipc/mig) bad request message ID
-        gcc: warning: '-x c' after last input file has no effect
-        gcc: fatal error: no input files
-        compilation terminated.
-
-    These work:
-
-        $ Release+Debug+Asserts+Checks/bin/clang -x c /dev/fd/0 -E < [...]/test/Misc/dev-fd-fs.c
-        [...]
-        int x;
-        $ gcc -x c /dev/fd/0 -E < [...]/test/Misc/dev-fd-fs.c
-        [...]
-        int x;
-
-        #include <stdio.h>
-        #include <unistd.h>
-        
-        int main(int argc, char *argv[])
-        {   
-          while (argc > 0)
-            {
-              int err;
-              char *f = argv[argc -1];
-        
-              err = access(f, F_OK);
-              if (err < 0)
-                printf("%s: %m\n", f);
-        
-              argc--;
-            }
-        
-          return 0;
-        }
-
-        $ ./a.out /dev/fd/0 < /dev/null
-        $ cat < /dev/null | ./a.out /dev/fd/0
-        /dev/fd/0: (ipc/mig) bad request message ID
-
-    `file_check_access` fails with `MIG_BAD_ID`, meaning this RPC is not
-    implemented.
-
-    The difference is that the former directly refers to the `/dev/null`
-    instance, whereas the latter goes through an intermediate pflocal instance.
-
-    Similarly:
-
-        $ stat /dev/fd/0 < /dev/null
-          File: `/dev/fd/0'
-          Size: 0               Blocks: 0          IO Block: 1048576 character special file
-        Device: 17h/23d Inode: 342820      Links: 1     Device type: 0,0
-        Access: (0666/crw-rw-rw-)  Uid: (    0/    root)   Gid: (    0/    root)
-        Access: 2012-11-27 16:03:19.000000000 +0100
-        Modify: 2012-11-27 16:03:19.000000000 +0100
-        Change: 2012-11-27 16:03:19.000000000 +0100
-         Birth: -
-        $ cat < /dev/null | stat /dev/fd/0
-          File: `/dev/fd/0'
-          Size: 0               Blocks: 0          IO Block: 65536  fifo
-        Device: 9h/9d   Inode: 0           Links: 0
-        Access: (0000/p---------)  Uid: (    0/    root)   Gid: (    0/    root)
-        Access: 1970-01-01 01:00:00.000000000 +0100
-        Modify: 1970-01-01 01:00:00.000000000 +0100
-        Change: 1970-01-01 01:00:00.000000000 +0100
-         Birth: -
-
-    `io_stat_request` fills in these values.    
-
-  * `Clang :: Tooling/clang-check-builtin-headers.cpp`
-
-    Fails: `fatal error: 'stddef.h' file not found`; succeeds when ran
-    manually.
-
-  * With `--enable-optimized --enable-expensive-checks --disable-threads
-    --enable-debug-symbols --enable-debug-runtime`, there are a few new FAILs
-    for both GNU/Linux and GNU/Hurd:
-
-      * `Clang :: Tooling/auto-detect-from-source-parent-of-cwd.cpp`
-
-      * `Clang :: Tooling/auto-detect-from-source-parent.cpp`
-
-      * `Clang :: Tooling/clang-check-autodetect-dir.cpp`
-
-    For all three, the `clang-check` invocation fails.  [[!LLVM_bug 15194]].
-
-  * Several tests are not considered on GNU/Hurd.
-
-        -PASS: Clang-Unit :: ASTMatchers/[...]/tschwinge/Horace_Silver.build/tools/clang/unittests/ASTMatchers/Release+Asserts/ASTMatchersTests/HasNameDeathTest.DiesOnEmptyName
-        -PASS: Clang-Unit :: ASTMatchers/[...]/tschwinge/Horace_Silver.build/tools/clang/unittests/ASTMatchers/Release+Asserts/ASTMatchersTests/HasNameDeathTest.DiesOnEmptyPattern
-        -PASS: Clang-Unit :: ASTMatchers/[...]/tschwinge/Horace_Silver.build/tools/clang/unittests/ASTMatchers/Release+Asserts/ASTMatchersTests/IsDerivedFromDeathTest.DiesOnEmptyBaseName
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.SemanticsDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringDecimalDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringDecimalExponentDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringDecimalSignificandDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringHexadecimalDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringHexadecimalExponentDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APFloatTest.StringHexadecimalSignificandDeath
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/APIntTest.StringDeath
-        -PASS: LLVM-Unit :: Support/[...]/tschwinge/Horace_Silver.build/unittests/Support/Release+Asserts/SupportTests/LeakDetector.Death1
-        -PASS: LLVM-Unit :: Support/[...]/tschwinge/Horace_Silver.build/unittests/Support/Release+Asserts/SupportTests/ValueHandle.AssertingVH_Asserts
-
-        GTEST_HAS_DEATH_TEST utils/unittest/googletest/include/gtest/internal/gtest-port.h
-
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/PackedVectorTest.SignedValues
-        -PASS: LLVM-Unit :: ADT/[...]/tschwinge/Horace_Silver.build/unittests/ADT/Release+Asserts/ADTTests/PackedVectorTest.UnsignedValues
-
-        EXPECT_DEBUG_DEATH utils/unittest/googletest/include/gtest/gtest-death-test.h
-
-  * Differences in test-suite, that are not evidently floating-point issues,
-    GNU/Linux vs. GNU/Hurd on coulomb.SCHWINGE:
-
-         gcc-4.6 -I/media/erich/home/thomas/tmp/llvm/tschwinge/Horace_Silver.build/projects/test-suite/SingleSource/UnitTests -I/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/SingleSource/UnitTests -I/home/thomas/tmp/llvm/tschwinge/Horace_Silver.build/projects/test-suite/../../../Horace_Silver/projects/test-suite/include -I../../include -I/home/thomas/tmp/llvm/tschwinge/Horace_Silver.build/include -I/home/thomas/tmp/llvm/tschwinge/Horace_Silver/include -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -DNDEBUG  -O3  /media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/SingleSource/UnitTests/2007-04-25-weak.c -lm -o Output/2007-04-25-weak.native  -lstdc++ 
-        +/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/SingleSource/UnitTests/2007-04-25-weak.c:3:1: warning: 'weak_import' attribute directive ignored [-Wattributes]
-        +/tmp/ccWGwKvo.o: In function `main':
-        +2007-04-25-weak.c:(.text.startup+0x7): undefined reference to `test_weak'
-        +collect2: ld returned 1 exit status
-        +make[2]: [Output/2007-04-25-weak.native] Error 1 (ignored)
-
-    On GNU/Linux, the clamav tests are compiled with `-DC_LINUX`.
-
-        +/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/MultiSource/Applications/lambda-0.1.3/lambda.cc:63:12: error: use of undeclared identifier 'MAXPATHLEN'
-        +                char buf[MAXPATHLEN+1];
-
-    ..., with follow-up failures.
-
-    `projects/test-suite/MultiSource/Applications/obsequi` is not at all
-    considered for GNU/Hurd.
-
-        +/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/MultiSource/Benchmarks/Olden/voronoi/newvor.c:178:25: warning: implicit declaration of function 'memalign' is invalid in C99 [-Wimplicit-function-declaration]
-        +    char* base = (char*)memalign(align_size, alloc_size);
-        +                        ^
-        +1 warning generated.
-
-        +/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/MultiSource/Benchmarks/Prolangs-C/archie-client/get_vdir.c:213:20: error: use of undeclared identifier 'MAXPATHLEN'
-        +                    char        l_name[MAX_DIR_LINESIZE];
-        +                                       ^
-        +/media/erich/home/thomas/tmp/llvm/test-suite/tschwinge/Art_Blakey/MultiSource/Benchmarks/Prolangs-C/archie-client/pprot.h:39:37: note: expanded from macro 'MAX_DIR_LINESIZE'
-        +#define        MAX_DIR_LINESIZE 160+MAXPATHLEN /* Max linesize in directory */
-        +                                    ^
-
-    ..., and several more.