gcc.sh

# if we have a c file name test.c

gcc -S test.c # translate the c lang into Assemble lang

gcc -c test.c # get the object file

gcc -DNODEBUG ... # Define a macro named NODEBUG

gcc -Og/O1/O2/O3 ... # The different levels of optmization

gcc -L/-l ... # contain the refer library when compiling

gcc -Werror -Wwarning -w ... # diable or allow the print of warning

gcc -g ... # for GDB debug

ar [cr] test_all.a test1.o test2.o # build up a new lib with test1.c & test2.c

ldd test.so[/usr/lib/xxx.so] # find the details of 'so' type file

# How to solve './tests: error while loading shared libraries: xxx.so.0:
# cannot open shared object file: No such file or directory'
sudo echo '/usr/local/lib' >> /etc/ld.so.conf
sudo /sbin/ldconfig –v # add xx.so to the ldd environment