On Thu, Dec 15, 2022 at 12:39:38PM +0100, Iain Buclaw wrote:
> 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?
Through extra code in *.exp file certainly, invoke
gdc -c cpp11.cpp -o cpp11.o
and
gdc -fextern-std=c++11 testcpp11.d cpp11.o -o testcpp11.exe
afterwards, but for dg-additional-sources I don't think so.
Maybe it would be nice to be able to pass options only to a certain
gcc backend binary and not to others, similarly to how
-Wa,option passes options to assembler, -Wp,option to preprocessor and
-Wl,option to linker.
-Wc,language,option ?
Then one could
gdc -Wc,d,-fextern-std=c++11 testcpp11.d cpp11.cpp -o testcpp11.exe
or
gccrs -Wc,rust,-frust-incomplete-and-experimental-compiler-do-not-use
whatever.rs something.c -o whatever
etc.
If we do, one would need to use it with care, because then e.g. for
gcc -Wc,c,-fsanitize=address
the driver wouldn't know it should link in -lasan etc.
Jakub
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