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Building GLibc in the Cygwin VM

Add the following lines to C:\cygwin\usr\include\cygwin\stat.h (before the last #endif):
```
#ifndef stat64
#define stat64 stat
#endif
```

Update C:\Cygwin\opt\crosstool\src\build_gcc_cross.sh :

#!/bin/bash

export TARGET=i586-linux-gnu
export PREFIX=/opt/crosstool/gcc-4.9.2-glibc-2.19/$TARGET
export PATH=$PATH:$PREFIX/bin

cd /opt/crosstool/src/build-glibc
find . -delete
../glibc-2.19/configure --prefix=/usr \
    --with-headers=$PREFIX/usr/include \
    --enable-add-ons=nptl --enable-kernel=3.0.0 \
    --with-binutils=$PREFIX --build=i686-pc-cygwin \
    --host=$TARGET --enable-shared --disable-profile \
    --with-tls --with-__thread --without-gd --without-cvs \
    libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes libc_cv_ssp=no
if [ "$?" -ne "0" ]; then
    echo "=== build script: failed to configure glibc ==="
    exit 1
fi
make
if [ "$?" -ne "0" ]; then
    echo "=== build script: failed to make glibc ==="
    exit 1
fi
make install_root=$PREFIX install
if [ "$?" -ne "0" ]; then
    echo "=== build script: failed to install glibc ==="
    exit 1
fi

echo "=== build script: OK ==="

Run C:\Cygwin\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
If there are no errors, shutdown Cygwin VM and make snapshot "SNAP-6".
Replace TARGET=i586-linux-gnu with TARGET=x86_64-linux-gnu, then run C:\Cygwin\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
If there are no errors, shutdown Cygwin VM and make snapshot "SNAP-7".
Undo stat64 preprocessor hack in C:\cygwin\usr\include\cygwin\stat.h.

Notes:

Glibc build will take a lot of time, 4-5 times more than binutils + gcc.
libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes options are here to disable linker tests. Because we run glibc build in the cross-environment, these tests create binary files which can't be executed and so fail the test.
nptl is a modern library to support POSIX threads in Linux; and it obsoletes linuxthreads, so they should be disabled.
"--enable-kernel" sets minimum version of Linux kernel for this glibc to run on. 3.0.0 should be good enough these days.
"--prefix=/usr" is not dangerous and will not hurt your /usr in host system, unless you call "make install" in plain and wrong way. This is an old glibc joke.
If glibc build for x86 drops out with complaints about missing __sync_bool_compare_and_swap_4 then you have probably misconfigured gcc on the previous step (forgot about "--with-arch=i586"). Try again!
If you want to build glibc for i686-linux-gnu or i686-pc-linux-gnu target, then you're likely to get the following error messages:
../sysdeps/i386/fpu/s_frexp.S: Assembler messages:
../sysdeps/i386/fpu/s_frexp.S:66: Error: invalid identifier for ".ifdef"
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1'
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1'
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1'
../sysdeps/i386/fpu/s_frexp.S:66: Error: unrecognized symbol type ""
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1'
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1'
../sysdeps/i386/fpu/s_frexp.S:66: Error: expected comma after name `' in .size directive
../sysdeps/i386/fpu/s_frexp.S:66: Error: ".endif" without ".if"
../sysdeps/i386/fpu/s_frexp.S:66: Error: junk `.get_pc_thunk.dx' after expression

In order to fix or prevent these errors, make the following corrections in the build_gcc_cross.sh:
```
make asm-CPPFLAGS="-D __i686=__i686"
if [ "$?" -ne "0" ]; then
    echo "=== build script: failed to make glibc ==="
    exit 1
fi
make asm-CPPFLAGS="-D __i686=__i686" install_root=$PREFIX install
if [ "$?" -ne "0" ]; then
    echo "=== build script: failed to install glibc ==="
    exit 1
fi
```
Also you may get error message about various missing syscalls (__-prefixed) if you forgot to replace .oS with .oZ in makefiles (Cygwin case-insensitive filesystem).
Without libc_cv_ssp=no configure option, you may encounter the following error:
/opt/crosstool/src/build-glibc/resolv/libresolv_pic.a(gethnamaddr.os): In function `getanswer':
/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:180: undefined reference to `__stack_chk_guard'
/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:483: undefined reference to `__stack_chk_guard'
/opt/crosstool/src/build-glibc/resolv/libresolv_pic.a(gethnamaddr.os): In function `__GI_res_gethostbyname2':
/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:510: undefined reference to `__stack_chk_guard'
/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:636: undefined reference to `__stack_chk_guard'
/opt/crosstool/src/build-glibc/resolv/libresolv_pic.a(gethnamaddr.os): In function `res_gethostbyaddr':
/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:644: undefined reference to `__stack_chk_guard'
/opt/crosstool/src/build-glibc/resolv/libresolv_pic.a(gethnamaddr.os):/opt/crosstool/src/glibc-2.19/resolv/gethnamaddr.c:783: more undefined references to `__stack_chk_guard' follow
collect2: error: ld returned 1 exit status
make[2]: *** [../Makerules:438: /opt/crosstool/src/build-glibc/resolv/libresolv.so] Error 1
make[2]: Leaving directory '/opt/crosstool/src/glibc-2.19/resolv'
make[1]: *** [Makefile:213: resolv/others] Error 2
make[1]: Leaving directory '/opt/crosstool/src/glibc-2.19'
make: *** [Makefile:9: all] Error 2
Without applying glibc--cygwin-sunrpc-hdrs-libs.diff patch, you may encounter the following error:
/opt/crosstool/src/build-glibc/sunrpc/cross-rpc_main.o:rpc_main.c:(.text+0x1f): undefined reference to `libintl_setlocale'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:169: /opt/crosstool/src/build-glibc/sunrpc/cross-rpcgen] Error 1
make[2]: Leaving directory '/opt/crosstool/src/glibc-2.19/sunrpc'
make[1]: *** [Makefile:213: sunrpc/others] Error 2
make[1]: Leaving directory '/opt/crosstool/src/glibc-2.19'
make: *** [Makefile:9: all] Error 2
=== build script: failed to make glibc ===

If you didn't add stat64 preprocessor hack to C:\cygwin\usr\include\cygwin\stat.h as explained above, you will get the following error during build:

rpc_main.c: In function `find_cpp':
rpc_main.c:329:17: error: storage size of `buf' isn't known
rpc_main.c: In function `checkfiles':
rpc_main.c:1117:17: error: storage size of `buf' isn't known
Makefile:165: recipe for target 
`/opt/crosstool/src/build-glibc/sunrpc/cross-rpc_main.o' failed
make[2]: *** [/opt/crosstool/src/build-glibc/sunrpc/cross-rpc_main.o] Error 1
make[2]: Leaving directory `/opt/crosstool/src/glibc-2.19/sunrpc'
Makefile:213: recipe for target `sunrpc/others' failed
make[1]: *** [sunrpc/others] Error 2
make[1]: Leaving directory `/opt/crosstool/src/glibc-2.19'
Makefile:9: recipe for target `all' failed
make: *** [all] Error 2

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Building GLibc in the Cygwin VM

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