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author | Jonathan Wakely <jwakely@redhat.com> | 2019-05-29 15:45:35 +0100 |
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committer | Jonathan Wakely <redi@gcc.gnu.org> | 2019-05-29 15:45:35 +0100 |
commit | b0c0d878a8b5bf39dbea4c192fed26d340524439 (patch) | |
tree | 0fe0e765cf8c296b2c62be34aa53081dbb7e80a1 /libstdc++-v3/configure.ac | |
parent | 0617e23c9531373d3b232152c0d81a2c707858d9 (diff) | |
download | gcc-b0c0d878a8b5bf39dbea4c192fed26d340524439.zip gcc-b0c0d878a8b5bf39dbea4c192fed26d340524439.tar.gz gcc-b0c0d878a8b5bf39dbea4c192fed26d340524439.tar.bz2 |
PR libstdc++/85494 use rdseed and rand_s in std::random_device
Add support for additional sources of randomness to std::random_device,
to allow using RDSEED for Intel CPUs and rand_s for Windows. When
supported these can be selected using the tokens "rdseed" and "rand_s".
For *-w64-mingw32 targets the "default" token will now use rand_s, and
for other i?86-*-* and x86_64-*-* targets it will try to use "rdseed"
first, then "rdrand", and finally "/dev/urandom".
To simplify the declaration of std::random_device in <bits/random.h> the
constructors now unconditionally call _M_init instead of _M_init_pretr1,
and the function call operator now unconditionally calls _M_getval. The
library code now decides whether _M_init and _M_getval should use a real
source of randomness or the mt19937 engine.
Existing code compiled against old libstdc++ headers will still call
_M_init_pretr1 and _M_getval_pretr1, but those functions now forward to
_M_init and _M_getval if a real source of randomness is available. This
means existing code compiled for mingw-w64 will start to use rand_s just
by linking to a new libstdc++.dll.
* acinclude.m4 (GLIBCXX_CHECK_X86_RDSEED): Define macro to check if
the assembler supports rdseed.
* config.h.in: Regenerate.
* configure: Regenerate.
* configure.ac: Use GLIBCXX_CHECK_X86_RDSEED.
* config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_CRT_RAND_S): Define.
* doc/html/*: Regenerate.
* doc/xml/manual/status_cxx2011.xml: Document new tokens.
* include/bits/random.h (random_device::random_device()): Always call
_M_init rather than _M_init_pretr1.
(random_device::random_device(const string&)): Likewise.
(random_device::operator()()): Always call _M_getval().
(random_device::_M_file): Replace first member of union with an
anonymous struct, with _M_file as its first member.
* src/c++11/random.cc [_GLIBCXX_X86_RDRAND] (USE_RDRAND): Define.
[_GLIBCXX_X86_RDSEED] (USE_RDSEED): Define.
(USE_MT19937): Define if none of the above are defined.
(USE_POSIX_FILE_IO): Define.
(_M_strtoul): Remove.
[USE_RDSEED] (__x86_rdseed): Define new function.
[_GLIBCXX_USE_CRT_RAND_S] (__winxp_rand_s): Define new function.
(random_device::_M_init(const string&)): Initialize new union members.
Add support for "rdseed" and "rand_s" tokens. Decide what the
"default" token does according to which USE_* macros are defined.
[USE_POSIX_FILE_IO]: Store a file descriptor.
[USE_MT19937]: Forward to _M_init_pretr1 instead.
(random_device::_M_init_pretr1(const string&)) [USE_MT19937]: Inline
code from _M_strtoul.
[!USE_MT19937]: Call _M_init, transforming the old default token or
numeric tokens to "default".
(random_device::_M_fini()) [USE_POSIX_FILE_IO]: Use close not fclose.
(random_device::_M_getval()): Use new union members to obtain a
random number from the stored function pointer or file descriptor.
[USE_MT19937]: Obtain a value from the mt19937 engine.
(random_device::_M_getval_pretr1()): Call _M_getval().
(random_device::_M_getentropy()) [USE_POSIX_FILE_IO]: Use _M_fd
instead of fileno.
[!USE_MT19937] (mersenne_twister): Do not instantiate when not needed.
* testsuite/26_numerics/random/random_device/85494.cc: New test.
From-SVN: r271740
Diffstat (limited to 'libstdc++-v3/configure.ac')
-rw-r--r-- | libstdc++-v3/configure.ac | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac index dadd882..2e3a1a9 100644 --- a/libstdc++-v3/configure.ac +++ b/libstdc++-v3/configure.ac @@ -417,6 +417,8 @@ GCC_CHECK_ASSEMBLER_HWCAP # Check if assembler supports rdrand opcode. GLIBCXX_CHECK_X86_RDRAND +# Check if assembler supports rdseed opcode. +GLIBCXX_CHECK_X86_RDSEED # This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE. GLIBCXX_CONFIGURE_TESTSUITE |