On 4/2/20 4:09 AM, Tobias Burnus wrote:
> Interestingly, only those two testcases use the effective-target check:
> gcc.dg/analyzer/sigsetjmp-5.c, gcc.dg/analyzer/sigsetjmp-6.c
> 
> Regarding the link test: No header file is included – it just
> defines the function ("extern char $funcname();") and calls it.

This is the same way configure scripts test for the existence of a 
library function; the test case is just an arbitrary reference to the 
named function that will generate an undefined symbol error from the 
linker if the standard libraries don't provide a definition.

> The check fails as "sigsetjmp" does not exist in glibc –
> the symbol is "__sigsetjmp" in glibc.

I've checked in this followup patch to make it also test for the 
presence of __sigsetjmp, and verified that the test case now runs and 
passes on x86_64_linux-gnu.

-Sandra