Wednesday, January 16, 2008

gcc - shared library

When I link the shared library in dynamic mode on FC5 (Fedoral Core 5), I got a failure when run my executables: "cannot restore segment prot after reloc: Permission denied", is it only happend on FC5?

# make compile
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-g++ -x c++ -c -Wall -Wno-unknown-pragmas -fno-common -fbounds-check -pipe -g -Wno-deprecated -pipe -o foo.o foo.cpp
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-g++ -shared -o libfoo.so foo.o -lc
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-ar -rcs libfoo.a foo.o
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-g++ -x c++ -c -Wall -Wno-unknown-pragmas -fno-common -fbounds-check -pipe -g -Wno-deprecated -pipe -o test.o test.cpp
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-g++ -dynamic -L. -lfoo -o test test.o
/opt/crosstool/i686-unknown-linux-gnu/gcc-3.4.1-glibc-2.3.3/bin/i686-unknown-linux-gnu-g++ -static -L. -lfoo -o test.static test.o libfoo.a
# ./test
./test: error while loading shared libraries: ./libfoo.so: cannot restore segment prot after reloc: Permission d[...]


Here is the solution:

# chcon -t textrel_shlib_t ./libfoo.so