Problems bootstrapping GCC on x86_64-unknown-cygwin

[Steven Bosscher]

Hello,

I'd like to bootstrap GCC5 on cygwin64, but my builds fail.

The tail of my buildlog looks like this:

----- 8< -----
make[3]: Leaving directory '/home/steven/devel/build-orig/gcc'
mkdir -p -- x86_64-unknown-cygwin/libgcc
Checking multilib configuration for libgcc...
Configuring stage 1 in x86_64-unknown-cygwin/libgcc
configure: creating cache ./config.cache
checking build system type... x86_64-unknown-cygwin
checking host system type... x86_64-unknown-cygwin
checking for --enable-version-specific-runtime-libs... no
checking for a BSD-compatible install... /usr/bin/install -c
checking for gawk... gawk
checking for x86_64-unknown-cygwin-ar... ar
checking for x86_64-unknown-cygwin-lipo... lipo
checking for x86_64-unknown-cygwin-nm... /home/steven/devel/build-orig/./gcc/nm
checking for x86_64-unknown-cygwin-ranlib... ranlib
checking for x86_64-unknown-cygwin-strip... strip
checking whether ln -s works... yes
checking for x86_64-unknown-cygwin-gcc...
/home/steven/devel/build-orig/./gcc/xgcc
-B/home/steven/devel/build-orig/./gcc/
-B/usr/local/x86_64-unknown-cygwin/bin/
-B/usr/local/x86_64-unknown-cygwin/lib/ -isystem
/usr/local/x86_64-unknown-cygwin/include -isystem
/usr/local/x86_64-unknown-cygwin/sys-include
checking for C compiler default output file name...
configure: error: in
`/home/steven/devel/build-orig/x86_64-unknown-cygwin/libgcc':
configure: error: C compiler cannot create executables
See `config.log' for more details.
Makefile:13857: recipe for target 'configure-stage1-target-libgcc' failed
make[2]: *** [configure-stage1-target-libgcc] Error 77
make[2]: Leaving directory '/home/steven/devel/build-orig'
Makefile:18001: recipe for target 'stage1-bubble' failed
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory '/home/steven/devel/build-orig'
Makefile:894: recipe for target 'all' failed
make: *** [all] Error 2
----- 8< -----


The problem is in configure for libgcc. config.log shows this:

----- 8< -----
configure:3379: $? = 1
configure:3395: /home/steven/devel/build-orig/./gcc/xgcc
-B/home/steven/devel/build-orig/./gcc/
-B/usr/local/x86_64-unknown-cygwin/bin/
-B/usr/local/x86_64-unknown-cygwin/lib/ -isystem
/usr/local/x86_64-unknown-cygwin/include -isystem
/usr/local/x86_64-unknown-cygwin/sys-include    -o conftest -g -O2
conftest.c  >&5
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find crtbegin.o: No such file or directory
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc_s
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc_s
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find crtend.o: No such file or directory
configure:3398: $? = 0
configure:3427: checking for C compiler default output file name
configure:3449: /home/steven/devel/build-orig/./gcc/xgcc
-B/home/steven/devel/build-orig/./gcc/
-B/usr/local/x86_64-unknown-cygwin/bin/
-B/usr/local/x86_64-unknown-cygwin/lib/ -isystem
/usr/local/x86_64-unknown-cygwin/include -isystem
/usr/local/x86_64-unknown-cygwin/sys-include    -g -O2   conftest.c
>&5
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find crtbegin.o: No such file or directory
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc_s
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc_s
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lgcc
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find crtend.o: No such file or directory
configure:3453: $? = 0
configure:3490: result:
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"
| /* end confdefs.h.  */
|
| int
| main ()
| {
|
|   ;
|   return 0;
| }
configure:3496: error: in
`/home/steven/devel/build-orig/x86_64-unknown-cygwin/libgcc':
configure:3500: error: C compiler cannot create executables
See `config.log' for more details.
----- 8< -----


I've seen builds fail this way before and just gave up, but this time
I'd like to know: What am I doing wrong?!

Configuration same as Tim Prince (in CC) who reports test results for
this on gcc-testresults:
----- 8< -----
$ cat gcc/configargs.h
/* Generated automatically. */
static const char configuration_arguments[] = "../trunk/configure
--target=x86_64-unknown-cygwin --enable-languages=c,c++,fortran
--disable-libsanitizer --enable-libgomp --enable-threads=posix
--disable-__cxa_atexit --with-dwarf2 --without-libiconv-prefix
--without-libintl-prefix --with-system-zlib --disable-werror
--without-cloog --without-isl --disable-nls";
static const char thread_model[] = "posix";

static const struct {
  const char *name, *value;
} configure_default_options[] = { { "cpu", "generic" }, { "arch", "x86-64" } };
----- 8< -----

Help?

Thanks,

Ciao!
Steven