http://sourceware.org/bugzilla/show_bug.cgi?id=12565
--- Comment #2 from Jonathan Larmour <jifl-bugzilla at jifvik dot org>
2011-03-15 19:52:27 UTC ---
Yes here's a definite way to reproduce. I can definitely confirm it's
platform-independent in fact as I've reproduced it with native Linux. Here it
is in annoying detail purely for completeness. Take shortcuts where you like:
1. Build binutils for native linux (I used CVS of 2011-03-10), and put the bin/
directory at the head of your PATH:
mkdir -p /tmp/b12565/build
cd /tmp/b12565/build
~/src/binutils/src/configure --prefix=/tmp/b12565/install
make all install
export PATH=/tmp/b12565/install/bin:$PATH
2. Create a helloworld app just for testing:
mkdir /tmp/b12565/c
cd /tmp/b12565/c
cat > helloworld.c <<EOF
#include <stdio.h>
int main(int argc, char *argv[])
{
printf("Hello world!\n");
return 0;
}
EOF
3. Build it with full verbosity, and with -g:
gcc -g -o helloworld helloworld.c -v -Wl,-v --save-temps
4. As a baseline, look at its .debug_info section:
readelf -x .debug_info helloworld | less
Notice it has useful stuff in.
5. Extract the default linker script with:
ld --verbose | sed -n '/^======/,/^======/p' |egrep -v ^====== > script.ld
6. Modify the .debug_info line of script.ld to add NOLOAD:
.debug_info 0 (NOLOAD) : { *(.debug_info .gnu.linkonce.wi.*) }
7. Cut'and'paste the link line (invoking ld) you will have seen in step (3) but
appending -T./script.ld
8. Look at .debug_info again, and you'll see it is zeroed:
readelf -x .debug_info helloworld | less
Again, as a reminder, I'm just using .debug_info as an example section which
isn't meant to be loaded. The problem is not specific to it of course.
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