[Bug bootstrap/18810] Operation not supported while installing 4.0.0 on apple-darmin-7.6.0.

[peter at pogma dot com]

------- Additional Comments From peter at pogma dot com  2005-02-10 03:08 -------
My /dev/null also gets unlinked during 'sudo make install', so I decided to find the problem.  I made a 
shared library that contained an unlink function:
#include <sys/syscall.h>
#include <string.h>

int unlink(const char *path)
{
  if (!strcmp("/dev/null",path)) {
        sleep(180);
        return 0;
  }
  return syscall(SYS_unlink,path);
}

and used DYLD_INSERT_LIBRARIES before doing make install as root. Doing this, I discovered that my 
gcc/libgcc.mk contains:
vis_hide := $(strip $(subst @,-,\
    $(shell if echo 'void foo(void); void foo(void) {}' | \
          $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) $(INCLUDES) -fvisibility=hidden -Werror \
          -c -xc - -o /dev/null 2> /dev/null; \
          then echo @fvisibility=hidden @DHIDE_EXPORTS; \
          fi)))

and that darwin's as has a write_object.c which at aoround line 582 has:
	(void)unlink(out_file_name);

I suggest changing the bit of gcc/mklibgcc.in that says:
  # Test -fvisibility=hidden.  We need both a -fvisibility=hidden on
  # the command line, and a #define to prevent libgcc2.h etc from
  # overriding that with #pragmas.  The dance with @ is to prevent
  # echo from seeing anything it might take for an option.
  echo "vis_hide := \$(strip \$(subst @,-,\\"
  echo "    \$(shell if echo 'void foo(void); void foo(void) {}' | \\"
  echo "          $gcc_compile -fvisibility=hidden -Werror \\"
  echo "          -c -xc - -o /dev/null 2> /dev/null; \\"
  echo "          then echo @fvisibility=hidden @DHIDE_EXPORTS; \\"
  echo "          fi)))"
  echo

So the -o /dev/null goes away. It shouldn't be too hard to make a temporary file name and rm the temp 
file here.





-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18810