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1 # _GCC_PICFLAG(FLAG, DISPATCH)
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2 # ----------------------------
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3 # Store PIC flag corresponding to DISPATCH triplet in FLAG.
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4 # Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
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5 AC_DEFUN([_GCC_PICFLAG], [
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6
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7 case "${$2}" in
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8 # PIC is the default on some targets or must not be used.
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9 *-*-darwin*)
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10 # For darwin, common symbols are not allowed in MH_DYLIB files
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11 case "${CFLAGS}" in
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12 # If we are using a compiler supporting mdynamic-no-pic
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13 # and the option has been tested as safe to add, then cancel
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14 # it here, since the code generated is incompatible with shared
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15 # libs.
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16 *-mdynamic-no-pic*) $1='-fno-common -mno-dynamic-no-pic' ;;
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17 *) $1=-fno-common ;;
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18 esac
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19 ;;
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20 alpha*-dec-osf5*)
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21 # PIC is the default.
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22 ;;
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23 hppa*64*-*-hpux*)
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24 # PIC is the default for 64-bit PA HP-UX.
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25 ;;
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26 i[[34567]]86-*-cygwin* | x86_64-*-cygwin*)
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27 ;;
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28 i[[34567]]86-*-mingw* | x86_64-*-mingw*)
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29 ;;
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30 i[[34567]]86-*-interix[[3-9]]*)
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31 # Interix 3.x gcc -fpic/-fPIC options generate broken code.
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32 # Instead, we relocate shared libraries at runtime.
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33 ;;
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34 i[[34567]]86-*-nto-qnx*)
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35 # QNX uses GNU C++, but need to define -shared option too, otherwise
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36 # it will coredump.
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37 $1='-fPIC -shared'
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38 ;;
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39 i[[34567]]86-pc-msdosdjgpp*)
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40 # DJGPP does not support shared libraries at all.
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41 ;;
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42 ia64*-*-hpux*)
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43 # On IA64 HP-UX, PIC is the default but the pic flag
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44 # sets the default TLS model and affects inlining.
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45 $1=-fPIC
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46 ;;
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47 mips-sgi-irix6*)
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48 # PIC is the default.
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49 ;;
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50 rs6000-ibm-aix* | powerpc-ibm-aix*)
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51 # All AIX code is PIC.
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52 ;;
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53
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54 # Some targets support both -fPIC and -fpic, but prefer the latter.
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55 # FIXME: Why?
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56 i[[34567]]86-*-* | x86_64-*-*)
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57 $1=-fpic
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58 ;;
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59 # FIXME: Override -fPIC default in libgcc only?
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60 sh-*-linux* | sh[[2346lbe]]*-*-linux*)
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61 $1=-fpic
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62 ;;
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63 # FIXME: Simplify to sh*-*-netbsd*?
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64 sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
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65 sh64-*-netbsd* | sh64l*-*-netbsd*)
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66 $1=-fpic
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67 ;;
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68 # Default to -fPIC unless specified otherwise.
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69 *)
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70 $1=-fPIC
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71 ;;
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72 esac
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73
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74 # If the user explicitly uses -fpic/-fPIC, keep that.
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75 case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in
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76 *-fpic*)
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77 $1=-fpic
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78 ;;
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79 *-fPIC*)
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80 $1=-fPIC
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81 ;;
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82 esac
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83 ])
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84
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85 # GCC_PICFLAG
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86 # -----------
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87 # Store host PIC flag in PICFLAG.
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88 AC_DEFUN([GCC_PICFLAG], [
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89 AC_REQUIRE([AC_CANONICAL_HOST])
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90 _GCC_PICFLAG([PICFLAG], [host])])
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91
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92 # GCC_PICFLAG_FOR_TARGET
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93 # ----------------------
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94 # Store target PIC flag in PICFLAG_FOR_TARGET.
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95 AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
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96 AC_REQUIRE([AC_CANONICAL_TARGET])
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97 _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])
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