I&#39;m currently stuck on building due to the ipcmon subproject and a &quot;__sprintf_chk&quot; error under Ubuntu 12.04:<div><br></div><blockquote style="margin:0 0 0 40px;border:none;padding:0px"><div><div><font face="courier new, monospace">/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L741&#39;:</font></div>



</div><div><div><font face="courier new, monospace">(.text+0x4088): undefined reference to `__sprintf_chk&#39;</font></div></div><div><div><font face="courier new, monospace">/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</font></div>



</div><div><div><font face="courier new, monospace">(.text+0x45c3): undefined reference to `__sprintf_chk&#39;</font></div></div><div><div><font face="courier new, monospace">/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</font></div>



</div><div><div><font face="courier new, monospace">(.text+0x473b): undefined reference to `__sprintf_chk&#39;</font></div></div><div><div><font face="courier new, monospace">/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</font></div>



</div><div><div><font face="courier new, monospace">(.text+0x4833): undefined reference to `__sprintf_chk&#39;</font></div></div><div><div><font face="courier new, monospace">/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `d_print_mod_list&#39;:</font></div>



</div><div><div><font face="courier new, monospace">(.text+0x62e9): undefined reference to `__sprintf_chk&#39;</font></div></div><div><div><font face="courier new, monospace">make[3]: *** [ipcmon] Error 1</font></div></div>



<div><div><font face="courier new, monospace">make[3]: Leaving directory `/home/dustin/tudos.build/l4/pkg/ipcmon/server/src/OBJ-x86_586-l4v2&#39;</font></div></div><div><div><font face="courier new, monospace">make[2]: *** [/home/dustin/tudos.build/l4/pkg/ipcmon/server/src/OBJ-x86_586-l4v2] Error 2</font></div>



</div><div><div><font face="courier new, monospace">make[2]: Leaving directory `/home/dustin/tudos/l4/pkg/ipcmon/server/src&#39;</font></div></div><div><div><font face="courier new, monospace">make[1]: *** [src] Error 2</font></div>



</div><div><div><font face="courier new, monospace">make[1]: Leaving directory `/home/dustin/tudos/l4/pkg/ipcmon/server&#39;</font></div></div><div><div><font face="courier new, monospace">make: *** [server] Error 2</font></div>



</div><div><div><br></div></div></blockquote><div>I tried disabling the substitution. According to the GCC documentation, any one of three separate options will do it:</div>
<div><br></div><div><div>       -fstack-protector</div><div>           Emit extra code to check for buffer overflows, such as stack smashing attacks.  This is done by adding a guard</div><div>           variable to functions with vulnerable objects.  This includes functions that call alloca, and functions with</div>


<div>           buffers larger than 8 bytes.  The guards are initialized when a function is entered and then checked when the</div><div>           function exits.  If a guard check fails, an error message is printed and the program exits.</div>


<div><br></div><div>           NOTE: In Ubuntu 6.10 and later versions this option is enabled by default for C, C++, ObjC, ObjC++, if none of</div><div>           -fno-stack-protector, -nostdlib, nor -ffreestanding are found.</div>


</div><div><br></div><div>So, I added all three of the options (at the bottom) to binary.inc:</div><div><br></div><div><div>CXXFLAGS+= $(BID_CFLAGS_GSTAB) $(BID_CFLAGS_OMIT_FP)</div><div>CXXFLAGS+= $(CXXFLAGS_$(OSYSTEM))</div>


<div>CXXFLAGS+= $(CXXFLAGS_$(@:.o=.cc))  $(CXXFLAGS_$(@:.o=.cc)_$(OSYSTEM))</div><div>CXXFLAGS+= $(CXXFLAGS_$(@:.o=.cpp)) $(CXXFLAGS_$(@:.o=.cpp)_$(OSYSTEM))</div><div>CXXFLAGS+= $(OPTS) $(filter-out -Wmissing-declarations -Wstrict-prototypes -Wmissing-prototypes,$(WARNINGS))</div>


<div>CXXFLAGS+= -fno-common <span style="background-color:rgb(153,255,153)">-fno-stack-protector -nostdlib -ffreestanding</span></div></div><div><br></div><div>I also added the same options on to the back of CFLAGS, just to be thorough. This is the output. As you can see, they make it into the command-line (there&#39;s some duplication due to our redundant adds), but I&#39;m still getting the same error:</div>

<div><br></div><div><div>  ... Compiling ipcmon-server.o</div><div>LD_PRELOAD=/home/dustin/tudos.build/l4/tool/gendep/libgendep.so GENDEP_TARGET=ipcmon-server.o GENDEP_BINARY=cc1   gcc -m32 -c  -DLOG_TAG=\&quot;ipcmon\&quot;    -DUSE_UCLIBC=y -DRAM_BASE=0x0    -DSYSTEM_x86_586_l4v2 -DARCH_x86 -DCPUTYPE_586 -DL4API_l4v2 -DCONFIG_L4_CALL_SYSCALLS -DCONFIG_L4_ABS_SYSCALLS  -I/home/dustin/tudos.build/l4/pkg/ipcmon/idl/OBJ-x86-l4v2 -I/home/dustin/tudos.build/l4/include/x86/l4v2 -I/home/dustin/tudos.build/l4/include/l4v2 -I/home/dustin/tudos.build/l4/include/x86 -I/home/dustin/tudos.build/l4/include -I/home/dustin/tudos/l4/../dice/include -I/home/drops/include/x86/l4v2 -I/home/drops/include/l4v2 -I/home/drops/include/x86 -I/home/drops/include -nostdinc -I/home/dustin/tudos.build/l4/include/x86/uclibc -I/home/dustin/tudos.build/l4/include/uclibc -I/home/dustin/tudos.build/l4/include/uclibc++ -I/home/drops/include/x86/uclibc -I/home/drops/include/uclibc -I/home/drops/include/uclibc++ -I/usr/lib/gcc/i686-linux-gnu/4.6/include -I/usr/lib/gcc/i686-linux-gnu/4.6/include-fixed -gstabs+      -g -O2 -fno-strict-aliasing  -march=i586 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations  -fno-common <span style="background-color:rgb(153,255,153)">-fno-stack-protector -nostdlib -ffreestanding -fno-stack-protector</span> -g /home/dustin/tudos.build/l4/pkg/ipcmon/idl/OBJ-x86-l4v2/ipcmon-server.c -o ipcmon-server.o</div>

<div>  ==&gt; Linking ipcmon</div><div>LD_PRELOAD=/home/dustin/tudos.build/l4/tool/gendep/libgendep.so GENDEP_TARGET=ipcmon GENDEP_BINARY=ld  GENDEP_BINARY_ALT1=ld ld -m elf_i386 -o ipcmon /home/dustin/tudos.build/l4/lib/x86_586/crt0.o components.o capdescriptor.o capmanager.o blacklist.o whitelist.o ipcmon-server.o -Ttext=0x1000000 --hash-style=sysv  -L/home/dustin/tudos.build/l4/lib/x86_586/l4v2 -L/home/dustin/tudos.build/l4/lib/x86_586 -L/home/dustin/tudos.build/l4/lib -L/home/drops/lib/x86_586/l4v2 -L/home/drops/lib/x86_586 -L/home/drops/lib  -T/home/dustin/tudos.build/l4/lib/x86_586/main_stat.ld  -lparsecmdline -static -lgeneric_ts -ll4env -ll4rm -ldm_generic -ldm_mem -lthread -lsemaphore -llogserver_capsule -lnames -ll4util_root -ll4util -lsigma0 -lroot -ll4env -ll4env_err -ll4rm -ldm_generic -ldm_mem -lthread -lslab -ll4sys -luc_c++ -lc++start.o /usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a -lmain -lcxx_base -nostdlib  -luc_c -luclibc_support -u mmap_anon -lc_be_simple_mem -lc_be_mmap -lc_be_mmap_util -lc_be_l4env_start_stop -lc_be_minimal_log_io -luc_be_simple_sleep -ll4env -llogserver_capsule -ll4rm -ldm_generic -ldm_mem -lthread -lgeneric_ts -luc_c /usr/lib/gcc/i686-linux-gnu/4.6/libgcc_eh.a /usr/lib/gcc/i686-linux-gnu/4.6/libgcc.a  -luc_c -ll4sys -ll4util -luc_be_minimal_io -Ttext=0x1000000 --warn-common -gc-sections</div>

<div>/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L741&#39;:</div><div>(.text+0x4088): undefined reference to `__sprintf_chk&#39;</div><div>/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</div>

<div>(.text+0x45c3): undefined reference to `__sprintf_chk&#39;</div><div>/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</div><div>(.text+0x473b): undefined reference to `__sprintf_chk&#39;</div>

<div>/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `.L747&#39;:</div><div>(.text+0x4833): undefined reference to `__sprintf_chk&#39;</div><div>/usr/lib/gcc/i686-linux-gnu/4.6/libsupc++.a(cp-demangle.o): In function `d_print_mod_list&#39;:</div>

<div>(.text+0x62e9): undefined reference to `__sprintf_chk&#39;</div><div>make[3]: *** [ipcmon] Error 1</div><div>make[3]: Leaving directory `/home/dustin/tudos.build/l4/pkg/ipcmon/server/src/OBJ-x86_586-l4v2&#39;</div><div>

make[2]: *** [/home/dustin/tudos.build/l4/pkg/ipcmon/server/src/OBJ-x86_586-l4v2] Error 2</div><div>make[2]: Leaving directory `/home/dustin/tudos/l4/pkg/ipcmon/server/src&#39;</div><div>make[1]: *** [src] Error 2</div><div>

make[1]: Leaving directory `/home/dustin/tudos/l4/pkg/ipcmon/server&#39;</div><div>make: *** [server] Error 2</div></div><div><br></div>
<div>Then, I built a test program, which builds perfectly:</div><div><br></div><div><div>#include &lt;stdio.h&gt;</div><div><br></div><div>void main()</div><div>{</div><div>        char message[100];</div><div>        __sprintf_chk(message, 0, 100, &quot;Test.&quot;);</div>

<div><br></div><div>        printf(&quot;Out: %s\n&quot;, message);</div><div>}</div></div><div><br></div><div>The output:</div><div><br></div><div><div>$ gcc -o sprintfchk_test sprintfchk_test.c</div><div>$ ./sprintfchk_test</div>

<div>Out: Test.</div></div><div><br></div><div>I then thought &quot;maybe it&#39;s the GCC version&quot;, since your list of dependencies indicates GCC 3 (my version is 4.6.3). So, I tried 3.0.4, 3.1.0, and 3.4.6, but none of them would build due to hard build errors (clearly, I&#39;m missing some required flags).</div>

<div><br></div><div>I&#39;d appreciate some help with this error. Obviously, I&#39;d prefer Ubuntu, but what distributions would you suggest for building?</div>
<div><br></div><div><br></div><div>Dustin</div>