1 | #!/bin/bash |
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2 | # |
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3 | # Copyright 2015 The Bazel Authors. All rights reserved. |
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4 | # |
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5 | # Licensed under the Apache License, Version 2.0 (the "License"); |
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6 | # you may not use this file except in compliance with the License. |
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7 | # You may obtain a copy of the License at |
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8 | # |
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9 | # http://www.apache.org/licenses/LICENSE-2.0 |
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10 | # |
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11 | # Unless required by applicable law or agreed to in writing, software |
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12 | # distributed under the License is distributed on an "AS IS" BASIS, |
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13 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | # See the License for the specific language governing permissions and |
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15 | # limitations under the License. |
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16 | # |
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17 | # OS X relpath is not really working. This is a wrapper script around gcc |
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18 | # to simulate relpath behavior. |
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19 | # |
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20 | # This wrapper uses install_name_tool to replace all paths in the binary |
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21 | # (bazel-out/.../path/to/original/library.so) by the paths relative to |
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22 | # the binary. It parses the command line to behave as rpath is supposed |
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23 | # to work. |
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24 | # |
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25 | # See https://blogs.oracle.com/dipol/entry/dynamic_libraries_rpath_and_mac |
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26 | # on how to set those paths for Mach-O binaries. |
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27 | # |
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28 | set -eu |
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29 | |
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30 | GCC=/usr/bin/gcc |
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31 | INSTALL_NAME_TOOL="/usr/bin/install_name_tool" |
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32 | |
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33 | LIBS= |
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34 | LIB_DIRS= |
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35 | RPATHS= |
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36 | OUTPUT= |
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37 | # let parse the option list |
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38 | for i in "$@"; do |
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39 | if [[ "${OUTPUT}" = "1" ]]; then |
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40 | OUTPUT=$i |
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41 | elif [[ "$i" =~ ^-l(.*)$ ]]; then |
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42 | LIBS="${BASH_REMATCH[1]} $LIBS" |
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43 | elif [[ "$i" =~ ^-L(.*)$ ]]; then |
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44 | LIB_DIRS="${BASH_REMATCH[1]} $LIB_DIRS" |
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45 | elif [[ "$i" =~ ^-Wl,-rpath,\@loader_path/(.*)$ ]]; then |
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46 | RPATHS="${BASH_REMATCH[1]} ${RPATHS}" |
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47 | elif [[ "$i" = "-o" ]]; then |
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48 | # output is coming |
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49 | OUTPUT=1 |
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50 | fi |
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51 | done |
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52 | |
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53 | # Call gcc |
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54 | ${GCC} "$@" |
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55 | |
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56 | function get_library_path() { |
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57 | for libdir in ${LIB_DIRS}; do |
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58 | if [ -f ${libdir}/lib$1.so ]; then |
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59 | echo "${libdir}/lib$1.so" |
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60 | elif [ -f ${libdir}/lib$1.dylib ]; then |
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61 | echo "${libdir}/lib$1.dylib" |
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62 | fi |
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63 | done |
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64 | } |
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65 | |
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66 | # A convenient method to return the actual path even for non symlinks |
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67 | # and multi-level symlinks. |
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68 | function get_realpath() { |
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69 | local previous="$1" |
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70 | local next=$(readlink "${previous}") |
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71 | while [ -n "${next}" ]; do |
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72 | previous="${next}" |
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73 | next=$(readlink "${previous}") |
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74 | done |
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75 | echo "${previous}" |
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76 | } |
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77 | |
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78 | # Get the path of a lib inside a tool |
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79 | function get_otool_path() { |
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80 | # the lib path is the path of the original lib relative to the workspace |
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81 | get_realpath $1 | sed 's|^.*/bazel-out/|bazel-out/|' |
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82 | } |
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83 | |
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84 | # Do replacements in the output |
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85 | for rpath in ${RPATHS}; do |
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86 | for lib in ${LIBS}; do |
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87 | unset libname |
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88 | if [ -f "$(dirname ${OUTPUT})/${rpath}/lib${lib}.so" ]; then |
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89 | libname="lib${lib}.so" |
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90 | elif [ -f "$(dirname ${OUTPUT})/${rpath}/lib${lib}.dylib" ]; then |
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91 | libname="lib${lib}.dylib" |
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92 | fi |
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93 | # ${libname-} --> return $libname if defined, or undefined otherwise. This is to make |
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94 | # this set -e friendly |
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95 | if [[ -n "${libname-}" ]]; then |
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96 | libpath=$(get_library_path ${lib}) |
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97 | if [ -n "${libpath}" ]; then |
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98 | ${INSTALL_NAME_TOOL} -change $(get_otool_path "${libpath}") \ |
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99 | "@loader_path/${rpath}/${libname}" "${OUTPUT}" |
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100 | fi |
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101 | fi |
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102 | done |
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103 | done |
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104 | |
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