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annotate gcc/config/arm/uclinuxfdpiceabi.h @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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145
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1 /* Configuration file for ARM GNU/Linux FDPIC EABI targets.
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2 Copyright (C) 2018-2020 Free Software Foundation, Inc.
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3 Contributed by STMicroelectronics.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published
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9 by the Free Software Foundation; either version 3, or (at your
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10 option) any later version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 /* On uClibc EABI GNU/Linux, we want to force -mfdpic by default,
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22 which also means we produce PIE code by default. */
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23 #undef FDPIC_CC1_SPEC
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24 #define FDPIC_CC1_SPEC \
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25 "%{!mno-fdpic:-mfdpic %{!fno-PIE:%{!fpie:%{!fPIC:%{!fpic: -fPIE}}}}}"
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26
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27 /* Add --fdpic assembler flag by default. */
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28 #undef TARGET_FDPIC_ASM_SPEC
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29 #define TARGET_FDPIC_ASM_SPEC "%{!mno-fdpic: --fdpic}"
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30
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31 /* TARGET_BIG_ENDIAN_DEFAULT is set in
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32 config.gcc for big endian configurations. */
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33 #if TARGET_BIG_ENDIAN_DEFAULT
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34 #define TARGET_FDPIC_LINKER_EMULATION "armelfb_linux_fdpiceabi"
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35 #else
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36 #define TARGET_FDPIC_LINKER_EMULATION "armelf_linux_fdpiceabi"
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37 #endif
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38
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39 /* Unless we generate a shared library or a relocatable object, we
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40 force -pie. */
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41 /* -static is not supported, because we have to define the
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42 dynamic-linker, as we have some relocations to resolve at load
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43 time. We do not generate an error in case the user explictly passes
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44 the -dynamic-linker option to the linker. */
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45 #undef SUBTARGET_EXTRA_LINK_SPEC
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46 #define SUBTARGET_EXTRA_LINK_SPEC \
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47 "%{!mno-fdpic: -m " TARGET_FDPIC_LINKER_EMULATION \
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48 "%{!shared:%{!r: -pie}} }" \
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49 "%{mno-fdpic: -m " TARGET_LINKER_EMULATION "}" \
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50 "%{!r:%{!mno-fdpic: -z now}}"
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51
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52 #undef STARTFILE_SPEC
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53 #define STARTFILE_SPEC "%{!mno-fdpic:%{!shared:crtreloc.o%s}} " \
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54 LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)