1 # _GCC_PICFLAG(FLAG, DISPATCH) 2 # ---------------------------- 3 # Store PIC flag corresponding to DISPATCH triplet in FLAG. 4 # Explit use of -fpic in CFLAGS corresponding to FLAG overrides default. 5 AC_DEFUN([_GCC_PICFLAG], [ 6 7 case "${$2}" in 8 # PIC is the default on some targets or must not be used. 9 *-*-darwin*) 10 # For darwin, common symbols are not allowed in MH_DYLIB files 11 case "${CFLAGS}" in 12 # If we are using a compiler supporting mdynamic-no-pic 13 # and the option has been tested as safe to add, then cancel 14 # it here, since the code generated is incompatible with shared 15 #libs. 16 *-mdynamic-no-pic*) $1='-fno-common -mno-dynamic-no-pic' ;; 17 *) $1=-fno-common ;; 18 esac 19 ;; 20 alpha*-dec-osf5*) 21 # PIC is the default. 22 ;; 23 hppa*64*-*-hpux*) 24 # PIC is the default for 64-bit PA HP-UX. 25 ;; 26 i[[34567]]86-*-cygwin* | x86_64-*-cygwin*) 27 ;; 28 i[[34567]]86-*-mingw* | x86_64-*-mingw*) 29 ;; 30 i[[34567]]86-*-interix[[3-9]]*) 31 # Interix 3.x gcc -fpic/-fPIC options generate broken code. 32 # Instead, we relocate shared libraries at runtime. 33 ;; 34 i[[34567]]86-*-nto-qnx*) 35 # QNX uses GNU C++, but need to define -shared option too, otherwise 36 # it will coredump. 37 $1='-fPIC -shared' 38 ;; 39 i[[34567]]86-pc-msdosdjgpp*) 40 # DJGPP does not support shared libraries at all. 41 ;; 42 ia64*-*-hpux*) 43 # On IA64 HP-UX, PIC is the default but the pic flag 44 # sets the default TLS model and affects inlining. 45 $1=-fPIC 46 ;; 47 mips-sgi-irix6*) 48 # PIC is the default. 49 ;; 50 rs6000-ibm-aix* | powerpc-ibm-aix*) 51 # All AIX code is PIC. 52 ;; 53 54 # Some targets support both -fPIC and -fpic, but prefer the latter. 55 # FIXME: Why? 56 i[[34567]]86-*-* | x86_64-*-*) 57 $1=-fpic 58 ;; 59 # FIXME: Override -fPIC default in libgcc only? 60 sh-*-linux* | sh[[2346lbe]]*-*-linux*) 61 $1=-fpic 62 ;; 63 # FIXME: Simplify to sh*-*-netbsd*? 64 sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \ 65 sh64-*-netbsd* | sh64l*-*-netbsd*) 66 $1=-fpic 67 ;; 68 # Default to -fPIC unless specified otherwise. 69 *) 70 $1=-fPIC 71 ;; 72 esac 73 74 # If the user explicitly uses -fpic/-fPIC, keep that. 75 case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in 76 *-fpic*) 77 $1=-fpic 78 ;; 79 *-fPIC*) 80 $1=-fPIC 81 ;; 82 esac 83 ]) 84 85 # GCC_PICFLAG 86 # ----------- 87 # Store host PIC flag in PICFLAG. 88 AC_DEFUN([GCC_PICFLAG], [ 89 AC_REQUIRE([AC_CANONICAL_HOST]) 90 _GCC_PICFLAG([PICFLAG], [host])]) 91 92 # GCC_PICFLAG_FOR_TARGET 93 # ---------------------- 94 # Store target PIC flag in PICFLAG_FOR_TARGET. 95 AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [ 96 AC_REQUIRE([AC_CANONICAL_TARGET]) 97 _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])]) 98
