1.\" $OpenBSD: clang-local.1,v 1.2 2016/09/27 19:33:57 pascal Exp $ 2.\" 3.\" Copyright (c) 2016 Pascal Stumpf <pascal@stumpf.co> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.\" 18.Dd $Mdocdate: September 27 2016 $ 19.Dt CLANG-LOCAL 1 20.Os 21.Sh NAME 22.Nm clang-local 23.Nd OpenBSD-specific behavior of LLVM/clang 24.Sh DESCRIPTION 25On 26.Ox , 27the LLVM/clang compiler exhibits the following characteristics: 28.Bl -dash 29.It 30.Nm clang 31comes with stack protection enabled by default, equivalent to the 32.Fl fstack-protector-strong 33option on other systems. 34The system will report any violation of the stack protector cookie along 35with the function name via 36.Xr syslog 3 37at 38.Dv LOG_CRIT 39priority. 40.It 41.Nm clang 42will generate PIE code by default, allowing the system to load the resulting 43binary at a random location. 44This behavior can be turned off by passing 45.Fl fno-pie 46to the compiler and 47.Fl nopie 48to the linker. 49.It 50The 51.Fl fstrict-aliasing 52option is turned off by default unless 53.Fl Ofast 54has been selected. 55.It 56The 57.Fl pg 58flag is an alias of 59.Fl p . 60.El 61.Sh SEE ALSO 62.Xr clang 1 63