macos – 禁用汇编程序警告“.section __TEXT,__ textcoal_nt,co

我找到了LLVM Commit r250349,Stop generating coal sections.这是负责的代码,但我不清楚如何禁用警告.

+  // Issue a warning if the target is not powerpc and Section is a *coal* section.
+  Triple TT = getParser().getContext().getObjectFileInfo()->getTargetTriple();
+  Triple::ArchType ArchTy = TT.getArch();
+
+  if (ArchTy != Triple::ppc && ArchTy != Triple::ppc64) {
+    StringRef NonCoalSection = StringSwitch<StringRef>(Section)
+                                   .Case("__textcoal_nt","__text")
+                                   .Case("__const_coal","__const")
+                                   .Case("__datacoal_nt","__data")
+                                   .Default(Section);
+
+    if (!Section.equals(NonCoalSection)) {
+      StringRef SectionVal(Loc.getPointer());
+      size_t B = SectionVal.find(',') + 1,E = SectionVal.find(',',B);
+      SMLoc BLoc = SMLoc::getFromPointer(SectionVal.data() + B);
+      SMLoc ELoc = SMLoc::getFromPointer(SectionVal.data() + E);
+      getParser().Warning(Loc,"section "" + Section + "" is deprecated",+                          SMRange(BLoc,ELoc));
+      getParser().Note(Loc,"change section name to "" + NonCoalSection +
+                       """,SMRange(BLoc,ELoc));
+    }
+  }
+

我无法重定向2> / dev / null因为此时配置有点脆弱,它会丢弃其他警告和错误.

如何在煤炭部分禁用Clang汇编程序警告？

当GCC编译器遇到-Wa,-q时,它使用/ opt / local / bin / clang作为汇编程序而不是/ opt / local / bin / as.以下是相关版本.

$/opt/local/bin/g++-mp-6 --version
g++-mp-6 (MacPorts gcc6 6.1.0_0) 6.1.0
Copyright (C) 2016 Free Software Foundation,Inc.

$/opt/local/bin/clang --version
clang version 3.8.0 (branches/release_38 262722)
Target: x86_64-apple-darwin12.6.0

$/opt/local/bin/as -version
Apple Inc version cctools-877.8,GNU assembler version 1.38

向WBXFLAGS添加-Wno弃用不会抑制警告.我也尝试过-fno-tree-coalesce-vars没有快乐(这可能会影响性能).

以下sed在OS X上使用sed或gsed不匹配：

$CXXFLAGS="-DNDEBUG -g2 -O2" make CXX=/opt/local/bin/g++-mp-6 2>&1 | 
  gsed -e '/(__TEXT|__DATA)/,+2d'
/opt/local/bin/g++-mp-6 -DNDEBUG -g2 -O2 -fPIC -march=native -Wa,-q -pipe -c rijndael.cpp
<stdin>:3:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3:11: note: change section name to "__text"
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
...

/opt/local/bin/g++-mp-6 -DNDEBUG -g2 -O2 -fPIC -march=native -Wa,-q -DMACPORTS_GCC_COMPILER=1 -c cryptlib.cpp
<stdin>:3:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:2665:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:2665:11: note: change section name to "__text"
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3925:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3925:11: note: change section name to "__text"
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3963:11: warning: section "__textcoal_nt" is deprecated
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~
<stdin>:3963:11: note: change section name to "__text"
        .section __TEXT,pure_instructions
                 ^      ~~~~~~~~~~~~~

[Hundred of these ommitted for each source file]

以下是相关的GCC和LLVM错误报告：

> GCC Issue 71767 – Endless stream of warnings when using GCC with -Wa,-q and Clang Integrated Assembler
> LLVM Issue 28427 – Endless stream of warnings when using GCC with -Wa,-q and Clang Integrated Assembler