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R.. GitHub STOP HELPING ICE
R.. GitHub STOP HELPING ICE

Reputation: 215261

How to stop gcc from passing -L with standard library paths to the linker

I have a script that needs to prevent gcc from passing -L with the standard library paths to ld. Using -nostdlib inhibits the -lc -lgcc etc. but not the -L. Using -Wl,-nostdlib prevents the linker from using its own standard path, but doesn't stop gcc from passing -L with the standard paths. Is there any way to ensure that gcc calls the linker with nothing in the library path expect the directories I explicitly write on the command line?

Upvotes: 7

Views: 2130

Answers (1)

R.. GitHub STOP HELPING ICE
R.. GitHub STOP HELPING ICE

Reputation: 215261

I found a solution but it depends on gcc 4.4 or later for the -wrapper option (slightly updated version of the script):

inc=/path/to/alt/incl
lib=/path/to/alt/libs
crt=/path/to/alt/crt1.o
gcc -wrapper sh,-c,'
x= ; z= ; s= ; for i ; do
[ "$z" ] || set -- ; z=1
case "$i" in
-shared) s=1 ; set -- "$@" "$i" ;;
-Lxxxxxx) x=1 ;;
-xxxxxx) x= ; [ "$s" ] || set -- "$@" '"'$crt'"' ;;
*) [ "$x" ] || set -- "$@" "$i" ;;
esac
done
exec "$0" "$@"
' -nostdinc -nostdlib -isystem "$inc" -Wl,-xxxxxx "$@" -L"$lib" -Lxxxxxx -Wl,-nostdlib -lc -lgcc

My version of this wrapper is tuned to re-add alternate crt1.o and libc and libgcc files in place of the ones it prevents access to, but you could just as easily omit them if needed.

Upvotes: 4

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