From e54c80ab9def177802bb2bd758041933db24f76a Mon Sep 17 00:00:00 2001 From: q66 Date: Sun, 14 Apr 2024 14:47:34 +0200 Subject: [PATCH 16/29] clang: add fortify include paths for musl triplets + enable fortify --- clang/lib/Driver/ToolChains/Linux.cpp | 12 ++++++++---- clang/lib/Frontend/InitPreprocessor.cpp | 5 +++++ 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp index 2ac0139dc..9a9b40a25 100644 --- a/clang/lib/Driver/ToolChains/Linux.cpp +++ b/clang/lib/Driver/ToolChains/Linux.cpp @@ -688,10 +688,14 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, if (getTriple().getOS() == llvm::Triple::RTEMS) return; - // Add an include of '/include' directly. This isn't provided by default by - // system GCCs, but is often used with cross-compiling GCCs, and harmless to - // add even when Clang is acting as-if it were a system compiler. - addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include")); + if (getTriple().isMusl()) { + addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include/fortify")); + } else { + // Preserve original clang behavior for non-musl triples, but for musl + // this just gets in the way and none of our crosstoolchains are ever + // actually built this way (and we'd have to figure out fortify for it) + addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include")); + } addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include")); diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index 17f624e96..c239342fa 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -1523,6 +1523,11 @@ static void InitializePredefinedMacros(const TargetInfo &TI, #undef TARGET_OS } + // Enable fortify by default on musl when optimizing, but not with asan + if (TI.getTriple().isMusl() && LangOpts.Optimize && + !LangOpts.Sanitize.has(SanitizerKind::Address)) + Builder.defineMacro("_FORTIFY_SOURCE", "3"); + // Get other target #defines. TI.getTargetDefines(LangOpts, Builder); } -- 2.49.0