On 2020-04-17 17:33, Charles Russell wrote: > On 4/17/2020 2:46 PM, Brian Inglis wrote: > >> Try running under strace: >> >> $ strace -o prog.strace prog -options... args... >> >> or gdb: >> >> $ gdb prog >> (gdb) run -options... args... >> SEGV diagnostics >> (gdb) bt >> (gdb) q >> >> and attach or paste all output. > > The following is the case where I got an error message. Not actually a > segfault. > (Sorry, I'm not a programmer.) The executable, gdb, and strace all produce the > same output: > ----------- > At line 889 of file cgcrez.f (unit = 6, file = 'stdout') > Fortran runtime error: Missing initial left parenthesis in format > ^
> Here is the indicated line, using list mode in vim to show that there are no > unexpected nonprinting characters: > > 887 write(6,'(i6,1p3e9.2,x,e9.2,x,0pf6.3,x,1p2e10.2,''@'')')$ > 888 & iter, reldf,reldb,$ > 889 & gnorms, x1min, -cosag, beta(1),beta(np)$ > 890 $ > > This code compiled and ran on cygwin in the past, and checks out now in debian > stable. > > In my other case, which I may or may not be able to find again, the program > failed with no explicit error message like the one above. Stepping through > with > gdb showed that it was also crashing in a valid write statement. Do you perhaps need an extra pair of parentheses to repeat the formatted output, perhaps from the second specifier, as you have 5 variable format specifiers and 8 variables? Showing a bit more context with all variable declarations would help, and you can use cat -A (== -vET) to show non-printing characters e.g. $ egrep -nw 'iter|reldf|reldb|gnorms|x1min|cosag|beta|write' cgcrez.f | cat -A -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
