Hello. I've been experimenting building GCC with --enable-libstdcxx-debug, both on Linux and MSYS2, and there's one thing I'm not sure of and I wonder if you could help me understand it.
GCC docs say that configuring GCC with --enable-libstdcxx-debug will build debug libraries "in addition to what is normally built", i.e., in addition to the optimized libraries. I've tested this on Linux (Fedora 22, gcc 5.2.0), and it works as expected. It builds two versions of libstdc++.a and a libstdc++.so (libstdc++.so.6.0.21), which are installed in <prefix>/lib/gcc/x86_64-redhat-linux/5.2.0 (optimized version, or "what is normally built"), and in <prefix>/lib/gcc/x86_64-redhat-linux/5.2.0/debug (debug version). However, using --enable-libstdcxx-debug on MSYS2 gives me a different result. I got a single libstdc++.dll, in <prefix>/bin, and two versions of libstdc++.a, one in <prefix>/lib/gcc/x86_64-w64-mingw32/5.2.0 and another in <prefix>/lib/gcc/x86_64-w64-mingw32/5.2.0/debug. My first hypothesis was that --enable-libstdcxx-debug on MSYS2 was not creating the debug DLL (which I expected to find in <prefix>/lib/gcc/x86_64-w64-mingw32/5.2.0/debug). However, when I compared the versions of libstdc++.dll created using --enable-libstdcxx-debug vs. --disable-libstdcxx-debug, I noticed they were different. So, my conclusion, so far, is that --disable-libstdcxx-debug acts similar on Linux and MSYS2, and that --enable-libstdcxx-debug, on MSYS2, has the following behaviour: - Does not create the libstdc++.dll that is "normally built", i.e., the optimized version. - Creates the debug version of libstdc++.dll and installs it in <prefix>/bin. - Creates the debug version of libstdc++.a and installs it in <prefix>/lib/gcc/x86_64-w64-mingw32/5.2.0/debug. - Created the libstdc++.a that is "normally built", i.e., the optimized version, and installs it in <prefix>lib/gcc/x86_64-w64-mingw32/5.2.0. <http://5.2.0.0/> Is my reasoning correct, or am I missing something? Thanks for your help. --- Paulo Caetano http://cidebycide.blogspot.pt/
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