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use of register keyword gives undefined reference to `LC0'

[This was originally posted on the cygwin mailing list - I was asked to
post it to gcc-bugs]

On the 'cygwin' platform, using the -g flag to gcc results in the following
program compiling but failing to link. The error message is

gcc -g test.c
/cygdrive/c/TEMP/ccJVVXiI.o(.stab+0x1c4): In function `test':
/support/crbrb.c:11: undefined reference to `LC0'
collect2: ld returned 1 exit status

Contents of test.c is

int main(){
    return 0;
void test(double *b)
    register double a = 0.0;
    int k;
    for (k = 0; k < 1; k++) {
        *b = a;

Removing the 'register' keywork or switching off the debug option 'fixes'
the problem. This bug seems platform specific  eg gcc 3.2 on [intel] linux
works ok.

Version Information:
gcc -v
Reading specs from /bin/../lib/gcc-lib/i686-pc-cygwin/3.2/specs
Configured with: /netrel/src/gcc-3.2-3/configure
--enable-languages=c,c++,f77,java --enable-libgcj --enable-threads=posix
--with-system-zlib --enable-nls --without-included-gettext
--enable-interpreter --disable-sjlj-exceptions
--disable-version-specific-runtime-libs --enable-shared
--build=i686-pc-linux --host=i686-pc-cygwin --target=i686-pc-cygwin
--enable-haifa --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc
--libdir=/usr/lib --includedir=/nonexistent/include --libexecdir=/usr/sbin
Thread model: posix
gcc version 3.2 20020927 (prerelease)


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