On Wed, Nov 22, 2017 at 10:49:12AM +0100, Felix von Leitner wrote: > > thanks for the quick help! > > > > > So I add an > > > > > > > > #ifndef IOV_MAX > > > > #define IOV_MAX 1024 > > > > #endif > > > > > > > > Same issue in msghdr.c. > > > > IOV_MAX *must* be provided by <limits.h>; if it isn't, then your > > > cross-compiling > > > environment is not quite functional. > > > A-ha! That gets me somewhere. I'll investigate. > > Interestingly enough, IOV_MAX is not even defined by limits.h on my > non-cross-setup that compiled strace just fine: > > $ gcc -E - > #include <limits.h> > IOV_MAX > [Ctrl-D] > > -> > > [...] > # 2 "<stdin>" 2 > > IOV_MAX > > Most bizarre. It does appear if I define _GNU_SOURCE — both on ARM and > on x86_64. > > Are you sure about this?
It's _XOPEN_SOURCE, but as configure.ac contains AC_USE_SYSTEM_EXTENSIONS, I suppose _GNU_SOURCE is defined anyway. > > > All these constants are generated during build, > > > their definitions should be in sen.h file. > > > All right! Turns out you run > > > cat -- linux/xtensa/syscallent.h > > > and the -- is a GNU extension that my cat does not understand. I'll > > re-run the build with GNU cat now. > > If I support "cat -- foo.c" in my cat, the build goes though (modulo the > IOV_MAX issue). We can get rid of "--" in this place, it's not needed that much. -- ldv
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