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tst-setcontext10.c: Undef _FORTIFY_SOURCE
When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called, instead of longjmp. ____longjmp_chk compares the relative stack values to decide if it is called from a stack frame which called setjmp. If not, ____longjmp_chk assumes that an alternate signal stack is used. Since comparing the relative stack values isn't reliable with user context, when there is no signal, ____longjmp_chk will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk in user context test.
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@ -16,6 +16,15 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called,
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instead of longjmp. ____longjmp_chk compares the relative stack
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values to decide if it is called from a stack frame which called
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setjmp. If not, ____longjmp_chk assumes that an alternate signal
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stack is used. Since comparing the relative stack values isn't
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reliable with user context, when there is no signal, ____longjmp_chk
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will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk. */
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#undef _FORTIFY_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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