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    AS_HELP_STRING([--enable-ctime-tests],[compile constant-time tests [default=yes if valgrind enabled]]), [],
    [SECP_SET_DEFAULT([enable_ctime_tests], [auto], [auto])])

AC_ARG_ENABLE(experimental,
    AS_HELP_STRING([--enable-experimental],[allow experimental configure options [default=no]]), [],
    [SECP_SET_DEFAULT([enable_experimental], [no], [yes])])

AC_ARG_ENABLE(exhaustive_tests,
    AS_HELP_STRING([--enable-exhaustive-tests],[compile exhaustive tests [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_exhaustive_tests], [yes], [yes])])

AC_ARG_ENABLE(examples,
    AS_HELP_STRING([--enable-examples],[compile the examples [default=no]]), [],
    [SECP_SET_DEFAULT([enable_examples], [no], [yes])])

AC_ARG_ENABLE(module_ecdh,
    AS_HELP_STRING([--enable-module-ecdh],[enable ECDH module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_ecdh], [yes], [yes])])

AC_ARG_ENABLE(module_recovery,
    AS_HELP_STRING([--enable-module-recovery],[enable ECDSA pubkey recovery module [default=no]]), [],
    [SECP_SET_DEFAULT([enable_module_recovery], [no], [yes])])

AC_ARG_ENABLE(module_extrakeys,
    AS_HELP_STRING([--enable-module-extrakeys],[enable extrakeys module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_extrakeys], [yes], [yes])])

AC_ARG_ENABLE(module_schnorrsig,
    AS_HELP_STRING([--enable-module-schnorrsig],[enable schnorrsig module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_schnorrsig], [yes], [yes])])

AC_ARG_ENABLE(module_musig,
    AS_HELP_STRING([--enable-module-musig],[enable MuSig2 module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_musig], [yes], [yes])])

AC_ARG_ENABLE(module_ellswift,
    AS_HELP_STRING([--enable-module-ellswift],[enable ElligatorSwift module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_ellswift], [yes], [yes])])

AC_ARG_ENABLE(external_default_callbacks,
    AS_HELP_STRING([--enable-external-default-callbacks],[enable external default callback functions [default=no]]), [],
    [SECP_SET_DEFAULT([enable_external_default_callbacks], [no], [no])])

# Test-only override of the (autodetected by the C code) "widemul" setting.
# Legal values are:
#  * int64 (for [u]int64_t),
#  * int128 (for [unsigned] __int128),
#  * int128_struct (for int128 implemented as a structure),
#  *  and auto (the default).
AC_ARG_WITH([test-override-wide-multiply], [] ,[set_widemul=$withval], [set_widemul=auto])

AC_ARG_WITH([asm], [AS_HELP_STRING([--with-asm=x86_64|arm32|no|auto],
[assembly to use (experimental: arm32) [default=auto]])],[req_asm=$withval], [req_asm=auto])

AC_ARG_WITH([ecmult-window], [AS_HELP_STRING([--with-ecmult-window=SIZE],
[window size for ecmult precomputation for verification, specified as integer in range [2..24].]
[Larger values result in possibly better performance at the cost of an exponentially larger precomputed table.]
[The table will store 2^(SIZE-1) * 64 bytes of data but can be larger in memory due to platform-specific padding and alignment.]
[A window size larger than 15 will require you delete the prebuilt precomputed_ecmult.c file so that it can be rebuilt.]
[For very large window sizes, use "make -j 1" to reduce memory use during compilation.]
[The default value is a reasonable setting for desktop machines (currently 15). [default=15]]
)],
[set_ecmult_window=$withval], [set_ecmult_window=15])

AC_ARG_WITH([ecmult-gen-kb], [AS_HELP_STRING([--with-ecmult-gen-kb=2|22|86],
[The size of the precomputed table for signing in multiples of 1024 bytes (on typical platforms).]
[Larger values result in possibly better signing/keygeneration performance at the cost of a larger table.]
[The default value is a reasonable setting for desktop machines (currently 86). [default=86]]
)],
[set_ecmult_gen_kb=$withval], [set_ecmult_gen_kb=86])

AC_ARG_WITH([valgrind], [AS_HELP_STRING([--with-valgrind=yes|no|auto],
[Build with extra checks for running inside Valgrind [default=auto]]
)],
[req_valgrind=$withval], [req_valgrind=auto])

###
### Handle config options (except for modules)
###

if test x"$req_valgrind" = x"no"; then
  enable_valgrind=no
else
  SECP_VALGRIND_CHECK
  if test x"$has_valgrind" != x"yes"; then
    if test x"$req_valgrind" = x"yes"; then
      AC_MSG_ERROR([Valgrind support explicitly requested but valgrind/memcheck.h header not available])
    fi
    enable_valgrind=no
  else
    enable_valgrind=yes
  fi
fi

if test x"$enable_ctime_tests" = x"auto"; then
    enable_ctime_tests=$enable_valgrind
fi

print_msan_notice=no
if test x"$enable_ctime_tests" = x"yes"; then
  SECP_MSAN_CHECK
  # MSan on Clang >=16 reports unitialized memory in function parameters and return values, even if
  # the uninitalized variable is never actually "used". This is called "eager" checking, and it's
  # sounds like good idea for normal use of MSan. However, it yields many false positives in the
  # ctime_tests because many return values depend on secret (i.e., "uninitialized") values, and
  # we're only interested in detecting branches (which count as "uses") on secret data.
  if test x"$msan_enabled" = x"yes"; then
    SECP_TRY_APPEND_CFLAGS([-fno-sanitize-memory-param-retval], SECP_CFLAGS)
    print_msan_notice=yes
  fi
fi

if test x"$enable_coverage" = x"yes"; then
    SECP_CONFIG_DEFINES="$SECP_CONFIG_DEFINES -DCOVERAGE=1"
    SECP_CFLAGS="-O0 --coverage $SECP_CFLAGS"
    # If coverage is enabled, and the user has not overridden CFLAGS,
    # override Autoconf's value "-g -O2" with "-g". Otherwise we'd end up
    # with "-O0 --coverage -g -O2".
    if test "$CFLAGS_overridden" = "no"; then
      CFLAGS="-g"
    fi
    LDFLAGS="--coverage $LDFLAGS"
else
    # Most likely the CFLAGS already contain -O2 because that is autoconf's default.
    # We still add it here because passing it twice is not an issue, and handling
    # this case would just add unnecessary complexity (see #896).
    SECP_CFLAGS="-O2 $SECP_CFLAGS"
fi