ceph/src/boost/libs/dll/example/b2_workarounds.hpp

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright Antony Polukhin, 2015-2022.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt
   6 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_DLL_EXAMPLE_COMMON_B2_WORKAROUNDS_HPP
   9 #define BOOST_DLL_EXAMPLE_COMMON_B2_WORKAROUNDS_HPP
  10
  11 #include <boost/dll/config.hpp>
  12 #include <boost/filesystem.hpp>
  13 #include <boost/system/error_code.hpp>
  14 #include <iostream>
  15 #include <cctype>
  16
  17 namespace b2_workarounds {
  18
  19
  20 inline boost::filesystem::path drop_version(const boost::filesystem::path& lhs) {
  21     boost::filesystem::path ext = lhs.filename().extension();
  22     if (ext.native().size() > 1 && std::isdigit(ext.string()[1])) {
  23         ext = lhs;
  24         ext.replace_extension().replace_extension().replace_extension();
  25         return ext;
  26     }
  27
  28     return lhs;
  29 }
  30
  31 inline bool is_shared_library(const std::string& s) {
  32     return (s.find(".dll") != std::string::npos || s.find(".so") != std::string::npos || s.find(".dylib") != std::string::npos)
  33             && s.find(".lib") == std::string::npos
  34             && s.find(".exp") == std::string::npos
  35             && s.find(".pdb") == std::string::npos
  36             && s.find(".manifest") == std::string::npos
  37             && s.find(".rsp") == std::string::npos
  38             && s.find(".obj") == std::string::npos
  39             && s.find(".a") == std::string::npos;
  40 }
  41
  42 inline bool is_shared_library(const char* p) {
  43     return b2_workarounds::is_shared_library(std::string(p));
  44 }
  45
  46 inline bool is_shared_library(const boost::filesystem::path& p) {
  47     return b2_workarounds::is_shared_library(p.string());
  48 }
  49
  50 inline boost::dll::fs::path first_lib_from_argv(int argc, char* argv[]) {
  51     BOOST_ASSERT(argc > 1);
  52     (void)argc;
  53
  54     for (int i = 1; i < argc; ++i) {
  55         if (b2_workarounds::is_shared_library(argv[i])) {
  56             return argv[i];
  57         }
  58
  59         std::cout << "b2_workarounds::first_lib_from_argv(argc, argv): skipping '" << argv[i] << "'" << std::endl;
  60     }
  61
  62     BOOST_ASSERT(false);
  63     return argv[1];
  64 }
  65
  66 // This ugly struct is required to drop library version from shared library generated by b2.
  67 struct argv_to_path_guard {
  68     const boost::filesystem::path original_;
  69     const boost::filesystem::path version_dropped_;
  70     const std::string just_path_;
  71     const bool same_;
  72
  73
  74     static inline boost::filesystem::path drop_b2_deco(const boost::filesystem::path& in) {
  75         std::size_t pos = in.filename().string().find("-");
  76         boost::filesystem::path res = in.parent_path() / in.filename().string().substr(0, in.filename().string().find("-"));
  77         if (pos != std::string::npos) {
  78             res += in.extension();
  79         }
  80         return res;
  81     }
  82
  83     inline explicit argv_to_path_guard(int argc, char* argv[])
  84         : original_(first_lib_from_argv(argc, argv))
  85         , version_dropped_( drop_b2_deco(drop_version(original_)) )
  86         , just_path_( version_dropped_.parent_path().string() )
  87         , same_(version_dropped_ == original_)
  88     {
  89         if (!same_) {
  90             boost::system::error_code ignore;
  91             boost::filesystem::remove(version_dropped_, ignore);
  92             boost::filesystem::copy(original_, version_dropped_, ignore);
  93         }
  94
  95         argv[1] = const_cast<char*>(just_path_.c_str());
  96     }
  97
  98     inline ~argv_to_path_guard() {
  99         if (!same_) {
 100             boost::system::error_code ignore;
 101             boost::filesystem::remove(version_dropped_, ignore);
 102         }
 103     }
 104 };
 105
 106 } // namespace b2_workarounds
 107
 108 #endif // BOOST_DLL_EXAMPLE_COMMON_B2_WORKAROUNDS_HPP
 109