Enabling Debugging During Build
Whether ports are built with debugging symbols can be controlled by the settings in /etc/make.conf.
Enable debugging for all ports:
Enable debugging for select ports:
WITH_DEBUG_PORTS= mail/dovecot security/krb5
If debugging is enabled for a specific port, the ports system will:
- Add DEBUG_FLAGS (defaults to -g) to CFLAGS
- Tries to prevent the binaries from being stripped (including checking the install target to replace "install-strip" with "install")
To customize the changes to CFLAGS in debugging mode:
DEBUG_FLAGS= -g -O0
This will instruct the compiler to:
- -g: Generate debug information
- -O0: Disable compiler optimizations
Checking Debugging Symbols
After a port has been built with the above debugging steps, you can check they have worked by using file(1) to analyze the installed binaries.
$ file /usr/local/sbin/dovecot /usr/local/sbin/dovecot: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf.so.1, for FreeBSD 12.0 (1200054), FreeBSD-style, with debug_info, not stripped
Note that this file has debug_info and is not stripped.