在OS X上使用MacPorts GCC并通过-Wa,-q登记Clang Integrated Assembler时,汇编程序会为每个文件生成一个警告流.警告的示例如下所示(其中很多,Stack Overflow编辑器不允许我粘贴整个流).
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
