From b1b70e6c35624ceb89f68b9ba535e014bf5050c1 Mon Sep 17 00:00:00 2001 From: Norman Feske Date: Mon, 21 May 2018 19:15:41 +0200 Subject: [PATCH] tool/link.h: remove outdated comment --- tool/link.h | 33 --------------------------------- 1 file changed, 33 deletions(-) diff --git a/tool/link.h b/tool/link.h index 712c840e39..4dbf2cad92 100644 --- a/tool/link.h +++ b/tool/link.h @@ -2,39 +2,6 @@ * \brief Stub for compiling GCC support libraries without libc * \author Norman Feske * \date 2011-08-31 - * - * The target components of GCC tool chains (i.e. libsupc++, libgcc_eh, and - * libstdc++) depend on the presence of libc includes. For this reason, a C - * library for the target platform is normally regarded as a prerequisite for - * building a complete tool chain. However, for low-level operating-system - * code, this prerequisite is not satisfied. - * - * There are two traditional solutions to this problem. The first is to leave - * out those target components from the tool chain and live without full C++ - * support (using '-fno-rtti' and '-fno-exceptions'). Because Genode relies on - * such C++ features however, this is no option. The other traditional solution - * is to use a tool chain compiled for a different target platform such as - * Linux. However, this approach calls for subtle problems because the target - * components are compiled against glibc and make certain presumptions about - * the underlying OS environment. E.g., the 'libstdc++' library of a Linux tool - * chain contains references to glibc's 'stderr' symbol, which does not exist - * on Genode's libc derived from FreeBSD. More critical assumptions are related - * to the mechanism used for thread-local storage. - * - * This header file overcomes these problems by providing all function - * prototypes and type declarations that are mandatory for compiling GCC's - * target components. Using this libc stub, all GCC target components can be - * built without the need for additional libc support. Of course, for actually - * using these target components, the target OS has to provide the - * implementation of a small subset of functions declared herein. On Genode, - * this subset is provided by the 'cxx' library. - * - * The code of the target components expects usual C header file names such as - * 'stdio.h'. It does not include 'libgcc_libc_stub.h'. By creating symlinks - * for all those file names pointing to this file, we ensure that this file is - * always included on the first occurrence of the inclusion of any libc header - * file. The set of symlinks pointing to this libc stub are created - * automatically by the 'tool_chain' script. */ /*