On Sat, 2019-03-23 at 22:54 +0530, Vinaya Dandur wrote: > My mistake. Thanks, but even if you include <signal.h> the issue still > exists. Yes TRAP_BRKPT is not included in signal.h, however gcc somehow > finds the definition for TRAP_BRKPT and I don't know how. This works in > other hosts.
A peruse of the sigaction man page for GNU/Linux might be enlightening: http://man7.org/linux/man-pages/man2/sigaction.2.html > Since glibc 2.20, the definitions of most of these symbols are > obtained from <signal.h> by defining feature test macros (before > including any header file) as follows: > > * _XOPEN_SOURCE with the value 500 or greater; > * _XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED; or > * _POSIX_C_SOURCE with the value 200809L or greater. > > For the TRAP_* constants, the symbol definitions are provided only > in the first two cases. Before glibc 2.20, no feature test macros > were required to obtain these symbols. So if you add #define _XOPEN_SOURCE 500 or both #define _XOPEN_SOURCE and #define _XOPEN_SOURCE_EXTENDED before your first #include, or if you add -D_XOPEN_SOURCE=500 or both -D_XOPEN_SOURCE and -D_XOPEN_SOURCE_EXTENDED to your compile line, then things should work. This is a question related to the GNU libc project, not GCC.
