Hi Erik, looks like gcc7 and current clang already print the macro and show it plus the position of the error / warning in it .
See https://clang.llvm.org/diagnostics.html Automatic Macro Expansion for an example . With Visual Studio I could not find anything similar , I asked our local Visual Studio experts for help, maybe I overlooked something . Best regards, Matthias > ------------------------------ > > Message: 4 > Date: Wed, 5 Sep 2018 09:57:06 -0700 > From: Erik Joelsson <erik.joels...@oracle.com> > To: "Baesken, Matthias" <matthias.baes...@sap.com>, > "'hotspot-...@openjdk.java.net'" <hotspot- > d...@openjdk.java.net>, > "'build-dev@openjdk.java.net'" <build-dev@openjdk.java.net> > Cc: "Simonis, Volker" <volker.simo...@sap.com> > Subject: Re: RFR : [XS] 8209942: [epsilon] range function for > EpsilonTLABElasticity causes compiler warning > Message-ID: <c77b314f-7c7c-dbe0-38bb-9a07a726b...@oracle.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > > > On 2018-09-05 04:03, Baesken, Matthias wrote: > > Hello, when compiling jdk/jdk on Windows, (with VS2017 update level > 15.8 and not disabling warnings as errors ) > > I came across this warning leading to build error : > > > > C:/jdk-just- > clone/src/hotspot/share/runtime/flags/jvmFlagRangeList.cpp(341): error > C2220: warning treated as error - no 'object' file generated > > C:/jdk-just- > clone/src/hotspot/share/runtime/flags/jvmFlagRangeList.cpp(341): warning > C4305: 'argument': truncation from 'const intx' to 'double' > > > > Would have been helpful to have a compiler flag set that really ***shows > the code*** leading to the warning/error (because it comes from heavy > macro expansion). > > > Do you know of such a flag? If so we certain would like to add it. > > /Erik > >
