84 lines
2.5 KiB
Diff
84 lines
2.5 KiB
Diff
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From 90ed6b991b0cf11599ac6ede2e03d952368d588d Mon Sep 17 00:00:00 2001
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From: William Wold <wm@wmww.sh>
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Date: Sat, 12 Jan 2019 14:58:44 +0100
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Subject: [PATCH 6/7] William enters the dlvsym fray
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---
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src/common/sharedlibrary/CMakeLists.txt | 27 +++++++++++++++++++++
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src/common/sharedlibrary/shared_library.cpp | 9 +++++++
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2 files changed, 36 insertions(+)
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diff --git a/src/common/sharedlibrary/CMakeLists.txt b/src/common/sharedlibrary/CMakeLists.txt
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index 0889ccc2f3..27436c5701 100644
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--- a/src/common/sharedlibrary/CMakeLists.txt
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+++ b/src/common/sharedlibrary/CMakeLists.txt
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@@ -14,6 +14,33 @@
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#
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# Authored by: Alexandros Frantzis <alexandros.frantzis@canonical.com>
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+include(CheckCXXSymbolExists)
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+
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+list(APPEND CMAKE_REQUIRED_LIBRARIES dl)
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+list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
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+
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+check_cxx_symbol_exists("dlvsym" "dlfcn.h" HAS_DLVSYM)
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+check_cxx_symbol_exists("dlsym" "dlfcn.h" HAS_DLSYM)
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+
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+if (NOT HAS_DLVSYM)
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+ if (NOT HAS_DLSYM)
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+ message(
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+ FATAL_ERROR
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+ "Could not detect dlvsym or dlsym"
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+ )
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+ endif()
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+
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+ set_source_files_properties (
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+ "shared_library.cpp"
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+ PROPERTIES COMPILE_DEFINITIONS MIR_DONT_USE_DLVSYM="1"
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+ )
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+
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+ message(
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+ WARNING
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+ "dlvsym() not supported by libc. Mir may attempt to load ABI-incompatible platform modules"
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+ )
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+endif()
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+
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add_library(mirsharedsharedlibrary OBJECT
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module_deleter.cpp
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shared_library.cpp
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diff --git a/src/common/sharedlibrary/shared_library.cpp b/src/common/sharedlibrary/shared_library.cpp
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index c97e26b040..80cbdb4186 100644
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--- a/src/common/sharedlibrary/shared_library.cpp
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+++ b/src/common/sharedlibrary/shared_library.cpp
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@@ -17,6 +17,7 @@
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*/
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#include "mir/shared_library.h"
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+#include <mir/log.h>
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#include <boost/throw_exception.hpp>
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#include <boost/exception/info.hpp>
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@@ -56,6 +57,13 @@ void* mir::SharedLibrary::load_symbol(char const* function_name) const
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void* mir::SharedLibrary::load_symbol(char const* function_name, char const* version) const
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{
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+ // Some libc implementations (such as musl) do not support dlvsym
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+
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+#ifdef MIR_DONT_USE_DLVSYM
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+ // Load the function without checking the version
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+ log_debug("Cannot check \"%s\" symbol version is \"%s\": dlvsym() is unavailable", function_name, version);
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+ return load_symbol(function_name);
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+#else
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if (void* result = dlvsym(so, function_name, version))
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{
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return result;
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@@ -64,4 +72,5 @@ void* mir::SharedLibrary::load_symbol(char const* function_name, char const* ver
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{
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BOOST_THROW_EXCEPTION(std::runtime_error(dlerror()));
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}
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+#endif
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}
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--
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2.20.1
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