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On Friday 31 May 2013 22:25:24 Andrew Pinski wrote: > On Fri, May 31, 2013 at 4:55 PM, Mike Frysinger wrote: > > On Friday 31 May 2013 14:53:04 Mike Frysinger wrote: > >> On Friday 31 May 2013 12:47:54 Steve Ellcey wrote: > >> > Some new tests have been added to the GCC testsuite (cilk tests) that > >> > check the value of argc and they expect it to be 1 if there are no > >> > arguments to the test program (and there are none) but I am getting 0 > >> > when I run the tests under the gnu simulator. Does anyone know why > >> > this is? I don't know if this is specific to my target (mips-mti-elf) > >> > or a general simulator problem. Perhaps it is related to my linker > >> > script? The mips-mti-elf target is built with newlib. Could someone > >> > else who uses the gnu simulator and newlib try this. It works fine > >> > for me under the qemu simulator. > >> > >> unfortunately, the argc/argv handling tends to be target specific and > >> spread across newlib, libgloss, and the sim (target specific pieces). > >> you might even see different behavior if the env is gdb rather than the > >> run frontend :). > >> > >> i'd have to dig into the specific mips lower startup code to see how it > >> transfers things, but this does work for Blackfin targets: > > > > ok, there's a bit of history here :). you can start here: > > http://sourceware.org/ml/newlib/2012/msg00134.html > > ... > > however, considering Jie's findings in the referenced thread, and no one > > has spoken up since, and it seems everyone's sim (except for Blackfin & > > SuperH) have been broken, then i guess it's time to call it. let's > > recommend people implement SYS_arg{c, n, nlen}, and document the > > process. hell, i really need to bite my tongue and write *any* sim > > documentation as i don't believe anyone has ever written any :(. > > This won't help non-gdb based simulators where the problem also exist. > I test gdb and gcc using a non-gdb based simulator all the time. The > environment is designed for a bare metal environment where there is no > argv or argc (well the bootloader does pass arguments down to the > program but it is hard to do using the simulator except using a > separate file and it never passes the application name either even via > the bootloader). perhaps, but it doesn't preclude fixing the GNU sim (not to be pedantic, but `run` isn't gdb based, it's entirely standalone). this is a long standing issue and it isn't unreasonable for people to expect this to work. > I think it is better to just fix the GCC testsuite rather than fixing > the simulators. or make it XFAIL when the sim is known to suck. -mike
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