Excerpts from Jakub Jelinek via Gcc-patches's message of Dezember 15, 2022
12:16 pm:
> We seem to have a problem in other testsuites too:
> grep ' valid for .*but not for' */*.log | sort -u
> gcc/gcc.log:/home/jakub/src/gcc/gcc/testsuite/gcc.dg/pragma-diag-6.c:2:30:
> warning: option '-Wnoexcept' is valid for C++/ObjC++ but not for C [-Wpragmas]
> gdc/gdc.log:cc1plus: warning: command-line option '-fextern-std=c++11' is
> valid for D but not for C++
> gdc/gdc.log:cc1plus: warning: command-line option '-fpreview=in' is valid for
> D but not for C++
> gfortran/gfortran.log:cc1: warning: command-line option '-fcheck=all' is
> valid for Fortran but not for C
> g++/g++.log:cc1: warning: command-line option '-nostdinc++' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++11' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++14' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++17' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++20' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++23' is valid for
> C++/ObjC++ but not for C
> g++/g++.log:cc1: warning: command-line option '-std=gnu++98' is valid for
> C++/ObjC++ but not for C
> rust/rust.log:cc1plus: warning: command-line option
> '-frust-incomplete-and-experimental-compiler-do-not-use' is valid for Rust
> but not for C++
> rust/rust.log:cc1: warning: command-line option
> '-frust-incomplete-and-experimental-compiler-do-not-use' is valid for Rust
> but not for C
> (of course, some of them could be from tests that this valid for but not for
> messages work right, that is clearly the case of pragma-diag-6.c).
>
> In gcc/testsuite/lib/target-supports.exp (check_compile) we already
> determine extension for the check_compile snippet based on magic comments
> with default to .c (Rust nor Modula 2 don't have any, should that be
> changed?), shouldn't we at that point based on the language filter out
> known options that will not work?
>
> So, given the above, at least when in gdc testsuite and language is
> not D filter out -fextern-std=* and -fpreview=in, for gfortran testsuite
> and language not Fortran filter out -fcheck=all, when in g++ testsuite and
> language is not C++ filter out -nostdinc++, -std=gnu++* and when
> in rust testsuite and language is not Rust filter out
> -frust-incomplete-and-experimental-compiler-do-not-use ?
>
For the gdc testsuite, those warnings arise because both language files
are compiled in the same invocation (dg-additional-sources "cpp11.cpp"),
so it ends up looking something like:
gdc -fextern-std=c++11 testcpp11.d cpp11.cpp -o testcpp11.exe
So ruling out some sort of filtering done by the gdc driver when
delegating calls to the C/C++/D language compilers, is there a way to
get dejagnu to compile dg-additional-sources one-at-a-time?
Iain.
