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GCC Cheat Sheet

HowTo

Linking

  • Mix Static and Dynamic Linking

    gcc <options> <sources> -o <binary> -Wl,-Bstatic <list of static libs> -Wl,Bdynamic <list of dynamic libs>

  • Link all static

    gcc -static ...

  • Link libgcc static

    gcc -static-gcc ...

  • Partial static linking

    gcc ... -Wl,-Bstatic <list of static libs> -Wl,Bdynamic <list of dynamic libs>

Warnings

  • Useful warnings

    -Wall -Wunused -Wextra -Wno-pointer-sign -Wno-unused-parameter

  • Static code analysis

    -fanalyzer

Symbols

  • Debug symbols

    CFLAGS='-g3 -ggdb -O0' ./configure

Hardening

  • Stack protect

    -fstack-protector

  • Fortify source

    -D_FORTIFY_SOURCE=<1/2>

  • Check hardening (Debian):

    hardening-check <binary>

  • Dump GCC distribution settings

    gcc -dumpspecs

Reading List