Bad ld option -M during build of gcc ?

[Michel <Michel at arbornet dot org>]

Hello,

I might have found a bug in the build of gcc 3.2.2 for Sun Solaris.

Having a rather old version of gcc installed (it was 2.95), I decided to 
update it. I updated firstly binutils and bison to current versions 
(binutils-2.9.1 and bison-1.875).

OS is Sun Solaris 2.6.

During the build of gcc shared libraries, I have an error from ld in the 
following command:
/gnu/src/gcc-3.2.2/gcc/xgcc -B/gnu/src/gcc-3.2.2/gcc/ 
-B/gnu/sparc-sun-solaris2.6/bin/  -B/gnu/sparc-sun-solaris2.6/lib/ 
-isystem /gnu/sparc-sun-solaris2.6/include -O2 -DIN_GCC -W -Wall 
-Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem 
./include -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 
-D__GCC_FLOAT_NOT_NEEDED -shared -nodefaultlibs -Wl,-h,libgcc_s.so.1 
-Wl,-z,text -Wl,-z,defs -Wl,-M,libgcc/./libgcc.map -o libgcc_s.so.1 
libgcc/./_muldi3.o libgcc/./_negdi2.o libgcc/./_lshrdi3.o 
libgcc/./_ashldi3.o libgcc/./_ashrdi3.o libgcc/./_ffsdi2.o 
libgcc/./_clz.o libgcc/./_cmpdi2.o libgcc/./_ucmpdi2.o 
libgcc/./_floatdidf.o libgcc/./_floatdisf.o libgcc/./_fixunsdfsi.o 
libgcc/./_fixunssfsi.o libgcc/./_fixunsdfdi.o libgcc/./_fixdfdi.o 
libgcc/./_fixunssfdi.o libgcc/./_fixsfdi.o libgcc/./_fixxfdi.o 
libgcc/./_fixunsxfdi.o libgcc/./_floatdixf.o libgcc/./_fixunsxfsi.o 
libgcc/./_fixtfdi.o libgcc/./_fixunstfdi.o libgcc/./_floatditf.o 
libgcc/./_clear_cache.o libgcc/./_trampoline.o libgcc/./__main.o 
libgcc/./_exit.o libgcc/./_absvsi2.o libgcc/./_absvdi2.o 
libgcc/./_addvsi3.o libgcc/./_addvdi3.o libgcc/./_subvsi3.o 
libgcc/./_subvdi3.o libgcc/./_mulvsi3.o libgcc/./_mulvdi3.o 
libgcc/./_negvsi2.o libgcc/./_negvdi2.o libgcc/./_ctors.o 
libgcc/./_divdi3.o libgcc/./_moddi3.o libgcc/./_udivdi3.o 
libgcc/./_umoddi3.o libgcc/./_udiv_w_sdiv.o libgcc/./_udivmoddi4.o 
libgcc/./unwind-dw2.o libgcc/./unwind-dw2-fde.o libgcc/./unwind-sjlj.o 
-lc && rm -f libgcc_s.so && ln -s libgcc_s.so.1 libgcc_s.so

ld complains that libgcc.map has not a good format and tries without 
success to use it as ld script. The problem should be in the option: 
-Wl,-M,libgcc/./libgcc.map

gcc -Wl passes the rest of the options to ld. I checked the -M option of 
ld, it says :
$  ld --version
GNU ld 2.9.1
$ld --help
...
 -M, --print-map             Print map file on standard output
...
 -Map FILE                   Write a map file

=> My conclusion is that -M should have no parameter, while the build 
script expects to write the map file into libgcc.map. If this is right, 
the correct option should be:
-Wl,-Map,libgcc/./libgcc.map

=> I changed the file gcc/config/t-slibgcc-sld where this options is 
defined (if I am not wrong):
SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \
   -Wl,-h,$(SHLIB_SONAME) -Wl,-z,text -Wl,-z,defs \
   -Wl,*-Map*,$(SHLIB_MAP) -o $(SHLIB_NAME) \
   @multilib_flags@ $(SHLIB_OBJS) -lc && \
   rm -f $(SHLIB_SOLINK) && \
   $(LN_S) $(SHLIB_NAME) $(SHLIB_SOLINK)

I restarted the build from the beginning (make distclean; ./configure; 
make bootstrap) and it seems to work.

Hope that this helps,
Michel