------- Comment #5 from oblivian at users dot sourceforge dot net 2008-04-03
01:40 -------
Is this something special in the compiler specs for libc?
I created this test file conftest.c
#include <stdio.h>
int testing_lib()
{
printf("hello world!\n");
return 0;
}
And ran a scaled down libgcc command with the stage 1 compiler:
/media/disk/build/scripts/tools/toolchain-pass-1/build/./gcc/xgcc
-B/media/disk/build/scripts/tools/toolchain-pass-1/build/./gcc/
-B/tools/usr/i686-pc-linux-gnu/bin/ -B/tools/usr/i686-pc-linux-gnu/lib/
-isystem /tools/usr/i686-pc-linux-gnu/include -isystem
/tools/usr/i686-pc-linux-gnu/sys-include
-L/media/disk/build/scripts/tools/toolchain-pass-1/build/./ld -O2 -O2 -g -g
-O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -isystem ./include -fPIC -g
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -shared
-nodefaultlibs -Wl,--soname=libgcc_s.so.1 -o ./conftest.so.1.tmp conftest.c -lm
-lc
------------------------------------------------------------------------------
conftest.c:4: warning: function declaration isn't a prototype
conftest.c: In function 'testing_lib':
conftest.c:4: warning: old-style function definition
/media/disk/build/scripts/tools/toolchain-pass-1/build/gcc/../ld/ld-new: cannot
find /tools/lib/libc.so.6 inside /tools
collect2: ld returned 1 exit status
------------------------------------------------------------------------------
Now running the same command without -lc
------------------------------------------------------------------------------
/media/disk/build/scripts/tools/toolchain-pass-1/build/./gcc/xgcc
-B/media/disk/build/scripts/tools/toolchain-pass-1/build/./gcc/
-B/tools/usr/i686-pc-linux-gnu/bin/ -B/tools/usr/i686-pc-linux-gnu/lib/
-isystem /tools/usr/i686-pc-linux-gnu/include -isystem
/tools/usr/i686-pc-linux-gnu/sys-include
-L/media/disk/build/scripts/tools/toolchain-pass-1/build/./ld -O2 -O2 -g -g
-O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -isystem ./include -fPIC -g
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -shared
-nodefaultlibs -Wl,--soname=libgcc_s.so.1 -o ./conftest.so.1.tmp conftest.c -lm
conftest.c:4: warning: function declaration isn't a prototype
conftest.c: In function 'testing_lib':
conftest.c:4: warning: old-style function definition
-------------------------------------------------------------------------------
Despite the warnings it creates the shared library file
and running
ldd conftest.so.1.tmp
linux-gate.so.1 => (0xb7eec000)
libm.so.6 => /tools/lib/libm.so.6 (0xb7ebf000)
/tools/lib/ld-linux.so.2 (0xb7eed000)
libc.so.6 => /tools/lib/libc.so.6 (0xb7d94000)
The new file not only is linked with the correct libm, but also libc????
Where is this special handling of -lc?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35804
