Building GCC 10.x warning question.

Code:

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../../gcc-git/gcc/cp/coroutines.cc:2700:22: warning: defaulted and deleted functions only available with '-std=c++11' or '-std=gnu++11'
 2700 |  var_nest_node () = default;

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gcc/coroutines.cc at master * gcc-mirror/gcc * GitHub

I am building a very recent (less than one week old) MinGW64 GCC for MSys2 (an cygwin clone) for 32 and 64 bit MinGW GCC work.

And, I got over an thousand warnings at first; I am now trying to reduce the warnings by removing or ignoring the un-important ones.

I have no idea if this is one to ignore or try to fix.

Can someone tell me which it is?

Tim S.

Wait, so you're not compiling with respect to C++11 or later?

Quote:

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Originally Posted by laserlight

Wait, so you're not compiling with respect to C++11 or later?

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Found the exact command; will try using C++11 standard next. -std=gnu++11

Code:

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i686-w64-mingw32-g++ -std=gnu++98 -fno-PIE -c  -DIN_GCC_FRONTEND -g -D__USE_MINGW_ACCESS -DIN_GCC    -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag -Wno-format -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings  -DHAVE_CONFIG_H -I. -Icp -I../../gcc-git/gcc -I../../gcc-git/gcc/cp -I../../gcc-git/gcc/../include -I../../gcc-git/gcc/../libcpp/include -I/mingw32/include -I/mingw32/include -I/mingw32/include  -I../../gcc-git/gcc/../libdecnumber -I../../gcc-git/gcc/../libdecnumber/bid -I../libdecnumber -I../../gcc-git/gcc/../libbacktrace -I/mingw32/include -D__USE_MINGW_ANSI_STDIO=1 -I/mingw32/include -o cp/coroutines.o -MT cp/coroutines.o -MMD -MP -MF cp/.deps/coroutines.TPo ../../gcc-git/gcc/cp/coroutines.cc

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I was thinking that might be the correct solution; but, since it was not already done by the MSys2 package I am trying to fix I was not sure.

It takes about 12 hours to build so could be a day or two before I can confirm it does not cause a new problem

Edit: I am having issues finding where "gnu++98" is being set; could be a few weeks before I locate it.

Edit2: Looks like I will ignore it the warning only looks to happen on stage 1 or before; stages 2 and 3 do not have the warning.

Tim S.

What is the version of g++ that you're using? I believe g++ has defaulted to C++11 or later for a few major versions now, e.g., a quick check shows g++ 6.5 will default to the GNU dialect of C++14.

Since, I posted the first post in this thread I have found that GCC sets explicit versions of at least different 4 values; still have not found where std=gnu++98 is set.

But, I have decided to ignore this warning since it only happens once in building stage 1 (or at least before stage 2) of GCC.

Tim S.