[Bug libstdc++/86934] Feature test macros in should respect _GLIBCXX_HOSTED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86934 Jonathan Wakely changed: What|Removed |Added Target Milestone|--- |9.4 Status|NEW |RESOLVED Resolution|--- |FIXED --- Comment #3 from Jonathan Wakely --- I think this is fixed since r277849 for gcc-10.1 and has been backported to the gcc-9 branch.
[Bug libstdc++/86934] Feature test macros in should respect _GLIBCXX_HOSTED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86934 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek --- (In reply to Jonathan Wakely from comment #1) > That should be simple, just include and and > compile with -Wsystem-headers to check for redefinition warnings. As discussed on IRC, for i in 98 11 14 17 2a; do echo '#include ' | g++ -D_GLIBCXX_VERSION_INCLUDED -E -std=c++$i -dD -xc++ - | grep '^[[:blank:]]*#[[:blank:]]*define[[:blank:]]*__cpp_' | sort -u > /tmp/1; echo '#include ' | g++ -E -std=c++$i -dD -xc++ - | grep '^[[:blank:]]*#[[:blank:]]*define[[:blank:]]*__cpp_' | sort -u > /tmp/2; diff -up /tmp/1 /tmp/2; done is a more thorough way of checking not just the case where both and other headers define the same __cpp_lib* macro differently, but also when one defines one and the other doesn't.
[Bug libstdc++/86934] Feature test macros in should respect _GLIBCXX_HOSTED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86934 --- Comment #1 from Jonathan Wakely --- (In reply to Jonathan Wakely from comment #0) > The current header doesn't account for the fact that many features > are not defined for freestanding builds. > > Also, the --enable-libstdcxx-filesystem-ts configure option means that > isn't always present, even for hsoted builds (but that should > change for GCC 9 anyway). That was PR 86756 and is fixed now. > I'm not sure how to do this cleanly so that is always consistent > with the real values in other headers. We could generate from a > script that processes the headers (separately for freestanding and hosted > headers) and just extracts the __cpp_lib_* macros and the preprocessor > conditions they depend on. Or maybe just a script that generates the file from input like: filesystem 201703 c++17 launder 201606 c++17 _GLIBCXX_HAVE_BUILTIN_LAUNDER shared_timed_mutex 201402 c++14 _GLIBCXX_HAS_GTHREADS > Also, in https://gcc.gnu.org/ml/libstdc++/2018-07/msg00128.html I said: > > It would be nice if we had tests to check that every macro in >matches the other definition of it (i.e. either both are > defined to the same value, or neither is defined). That should be simple, just include and and compile with -Wsystem-headers to check for redefinition warnings.
[Bug libstdc++/86934] Feature test macros in should respect _GLIBCXX_HOSTED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86934 Jonathan Wakely changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2018-08-13 Ever confirmed|0 |1
