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[Ada] Fix bootstrap with old GCC

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gcc/ada/

	* adaint.c (__gnat_file_time): Use regular arithmetic instead of
	__builtin_*_overflow routines if GCC version 4 or less and
	compiler is g++.
This commit is contained in:
Dmitriy Anisimkov 2020-08-06 11:54:48 +06:00 committed by Pierre-Marie de Rodat
parent ed9a428d02
commit 3c2d338129
1 changed files with 11 additions and 1 deletions
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12
gcc/ada/adaint.c
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@ -1503,6 +1503,9 @@ extern long long __gnat_file_time(char* name)
t_write.ft_time = fad.ftLastWriteTime;
#if defined(__GNUG__) && __GNUG__ <= 4
result = (t_write.ll_time - w32_epoch_offset) * 100;
#else
/* Next code similar to (t_write.ll_time - w32_epoch_offset) * 100
but on overflow returns LLONG_MIN value. */
@ -1513,6 +1516,7 @@ extern long long __gnat_file_time(char* name)
if (__builtin_smulll_overflow(result, 100, &result)) {
return LLONG_MIN;
}
#endif
#else
@ -1521,6 +1525,12 @@ extern long long __gnat_file_time(char* name)
return LLONG_MIN;
}
#if defined(__GNUG__) && __GNUG__ <= 4
result = (sb.st_mtime - ada_epoch_offset) * 1E9;
#if defined(st_mtime)
result += sb.st_mtim.tv_nsec;
#endif
#else
/* Next code similar to
(sb.st_mtime - ada_epoch_offset) * 1E9 + sb.st_mtim.tv_nsec
but on overflow returns LLONG_MIN value. */
@ -1538,7 +1548,7 @@ extern long long __gnat_file_time(char* name)
return LLONG_MIN;
}
#endif
#endif
#endif
return result;
}