I just want to point out using double quotes within ./configure --with-cc-opt values, for example,
will yield compilation errors like this (with nginx 1.0.4, for example):
gcc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Wunused-function -Wunused-variable -Wunused-value -Werror -g -Dfoo='"bar"' -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs \ -o objs/src/core/nginx.o \ src/core/nginx.c src/core/nginx.c: In function ‘main’: src/core/nginx.c:255: error: expected ‘)’ before ‘bar’
The logic for implementing "nginx -V" does not take into account special characters like double quotes, it seems.
This is quite inconvenient when 3rd-party modules want to expose string literal C macros to the end user to configure behaviors without manually editing the "config" file of that module.
Hopefully it can be fixed in the official version of nginx :)