0ac341f145
Bring in https://github.com/jedisct1/libsodium at 461ac93b260b91db8ad957f5a576860e3e9c88a1 (August 7, 2018), unmodified. libsodium is derived from Daniel J. Bernstein et al.'s 2011 NaCl ("Networking and Cryptography Library," pronounced "salt") software library. At the risk of oversimplifying, libsodium primarily exists to make it easier to use NaCl. NaCl and libsodium provide high quality implementations of a number of useful cryptographic concepts (as well as the underlying primitics) seeing some adoption in newer network protocols. I considered but dismissed cleaning up the directory hierarchy and discarding artifacts of other build systems in favor of remaining close to upstream (and easing future updates). Nothing is integrated into the build system yet, so in that sense, no functional change.
43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
# SYNOPSIS
|
|
#
|
|
# AX_CHECK_CATCHABLE_SEGV
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# Check whether segmentation violations can be caught using signal handlers.
|
|
|
|
#serial 1
|
|
|
|
AC_DEFUN([AX_CHECK_CATCHABLE_SEGV], [dnl
|
|
AC_PREREQ(2.64)
|
|
AS_VAR_PUSHDEF([CACHEVAR], [ax_cv_check_[]_AC_LANG_ABBREV[]CATCHABLE_SEGV])dnl
|
|
AC_CACHE_CHECK([whether segmentation violations can be caught when using the _AC_LANG compiler], CACHEVAR, [
|
|
AC_RUN_IFELSE([
|
|
AC_LANG_PROGRAM([[
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
static void sig(int _) { exit(0); }
|
|
]], [[
|
|
volatile unsigned char * volatile x = (volatile unsigned char *) malloc(8);
|
|
size_t i;
|
|
|
|
signal(SIGSEGV, sig);
|
|
signal(SIGBUS, sig);
|
|
#if !defined(__SANITIZE_ADDRESS__) && !defined(__EMSCRIPTEN__)
|
|
for (i = 0; i < 10000000; i += 1024) { x[-i] = x[i] = (unsigned char) i; }
|
|
#endif
|
|
free((void *) x);
|
|
exit(1)
|
|
]])],
|
|
[AS_VAR_SET(CACHEVAR, [yes])],
|
|
[AS_VAR_SET(CACHEVAR, [no])],
|
|
[AS_VAR_SET(CACHEVAR, [unknown])]
|
|
)
|
|
])
|
|
AS_VAR_IF(CACHEVAR, yes,
|
|
[AC_DEFINE([HAVE_CATCHABLE_SEGV], [1], [Define if segmentation violations can be caught using signal handlers])],
|
|
[AC_MSG_WARN([On this platform, segmentation violations cannot be caught using signal handlers. This is expected if you enabled a tool such as Address Sanitizer (-fsanitize=address), but be aware that using Address Sanitizer may also significantly reduce performance.])]
|
|
)
|
|
AS_VAR_POPDEF([CACHEVAR])dnl
|
|
])
|