1 #!/bin/bash 2 set -e -o pipefail 3 4 # This script wraps the go cross compilers. 5 # 6 # It ensures that Go binaries are linked with an external linker 7 # by default (cross clang). Appropriate flags are added to build a 8 # position independent executable (PIE) for ASLR. 9 # "export GOPIE=0" to temporarily disable this behavior. 10 11 function pie_enabled() 12 { 13 [[ "${GOPIE}" != "0" ]] 14 } 15 16 function has_ldflags() 17 { 18 # Check if any linker flags are present in argv. 19 for arg in "$@" 20 do 21 case "${arg}" in 22 -ldflags | -ldflags=*) return 0 ;; 23 -linkmode | -linkmode=*) return 0 ;; 24 -buildmode | -buildmode=*) return 0 ;; 25 -installsuffix | -installsuffix=*) return 0 ;; 26 -extld | -extld=*) return 0 ;; 27 -extldflags | -extldflags=*) return 0 ;; 28 esac 29 done 30 return 1 31 } 32 33 pie_flags=() 34 if pie_enabled && ! has_ldflags "$@" 35 then 36 case "$1" in 37 build | install | run | test) 38 # Add "-buildmode=pie" to "go build|install|run|test" commands. 39 pie_flags=( "$1" ) 40 shift 41 [[ "${GOOS}" == "android" ]] || pie_flags+=( "-buildmode=pie" ) 42 ;; 43 tool) 44 case "$2" in 45 asm) 46 # Handle direct assembler invocations ("go tool asm <args>"). 47 pie_flags=( "$1" "$2" "-shared" ) 48 shift 2 49 ;; 50 compile) 51 # Handle direct compiler invocations ("go tool compile <args>"). 52 pie_flags=( "$1" "$2" "-shared" ) 53 shift 2 54 [[ "${GOOS}" == "android" ]] || pie_flags+=( "-installsuffix=shared" ) 55 ;; 56 link) 57 # Handle direct linker invocations ("go tool link <args>"). 58 pie_flags=( "$1" "$2" "-extld" "${CC}" "-buildmode=pie" ) 59 shift 2 60 [[ "${GOOS}" == "android" ]] || pie_flags+=( "-installsuffix=shared" ) 61 ;; 62 esac 63 ;; 64 esac 65 fi 66 67 exec go "${pie_flags[@]}" "$@" 68
