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1 /* Definitions of ELF target support for Altera Nios II.
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2 Copyright (C) 2012-2018 Free Software Foundation, Inc.
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3 Contributed by Jonah Graham (jgraham@altera.com),
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4 Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com).
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5 Contributed by Mentor Graphics, Inc.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published
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11 by the Free Software Foundation; either version 3, or (at your
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12 option) any later version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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17 License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23
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24 /* Specs to support the additional command-line options for Nios II ELF
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25 toolchains. */
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26
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27 /* -msmallc chooses an alternate C library.
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28 -msys-lib= specifies an additional low-level system/hosting library and
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29 is typically used to suck in a library provided by a HAL BSP. */
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30 #undef LIB_SPEC
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31 #define LIB_SPEC \
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32 "--start-group %{msmallc: -lsmallc} %{!msmallc: -lc} -lgcc \
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33 %{msys-lib=*: -l%*} \
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34 --end-group \
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35 "
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36
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37 /* Linking with -mhal suppresses inclusion of the GCC-provided crt* begin/end
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38 code. Normally in this case you also link with -msys-crt0= to specify
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39 the startup code provided by the HAL BSP instead. */
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40 #undef STARTFILE_SPEC
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41 #define STARTFILE_SPEC \
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42 "%{mhal:" \
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43 "%{msys-crt0=*:%*} %{!msys-crt0=*:crt0%O%s} " \
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44 "%{msys-crt0=:%eYou need a C startup file for -msys-crt0=};" \
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45 ":crti%O%s crtbegin%O%s}"
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46
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47 #undef ENDFILE_SPEC
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48 #define ENDFILE_SPEC "%{!mhal:crtend%O%s crtn%O%s}"
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49
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50 /* The ELF target doesn't support the Nios II Linux ABI. */
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51 #define TARGET_LINUX_ABI 0
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52
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53 /* Default -fdelete-null-pointer-checks to off, to prevent the compiler
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54 from treating accesses to address zero as traps. On bare-metal Nios II
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55 targets address zero may legitimately be mapped to memory (e.g., the
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56 hardware description may specify this as the address of the interrupt
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57 vector). Users can override this on the command line to get the
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58 additional optimizations it enables. */
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59 #define SUBTARGET_OVERRIDE_OPTIONS \
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60 if (flag_delete_null_pointer_checks < 0) \
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61 flag_delete_null_pointer_checks = 0
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