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. 5AC_DEFUN([_GCC_PICFLAG], [ 6 7case "${$2}" in 8 # PIC is the default on some targets or must not be used. 9 *-*-darwin*) 10 # PIC is the default on this platform 11 # Common symbols not allowed in MH_DYLIB files 12 $1=-fno-common 13 ;; 14 alpha*-dec-osf5*) 15 # PIC is the default. 16 ;; 17 hppa*64*-*-hpux*) 18 # PIC is the default for 64-bit PA HP-UX. 19 ;; 20 i[[34567]]86-*-cygwin* | i[[34567]]86-*-mingw* | x86_64-*-mingw*) 21 ;; 22 i[[34567]]86-*-interix[[3-9]]*) 23 # Interix 3.x gcc -fpic/-fPIC options generate broken code. 24 # Instead, we relocate shared libraries at runtime. 25 ;; 26 i[[34567]]86-*-nto-qnx*) 27 # QNX uses GNU C++, but need to define -shared option too, otherwise 28 # it will coredump. 29 $1='-fPIC -shared' 30 ;; 31 i[[34567]]86-pc-msdosdjgpp*) 32 # DJGPP does not support shared libraries at all. 33 ;; 34 ia64*-*-hpux*) 35 # On IA64 HP-UX, PIC is the default but the pic flag 36 # sets the default TLS model and affects inlining. 37 $1=-fPIC 38 ;; 39 mips-sgi-irix6*) 40 # PIC is the default. 41 ;; 42 rs6000-ibm-aix* | powerpc-ibm-aix*) 43 # All AIX code is PIC. 44 ;; 45 46 # Some targets support both -fPIC and -fpic, but prefer the latter. 47 # FIXME: Why? 48 i[[34567]]86-*-* | x86_64-*-*) 49 $1=-fpic 50 ;; 51 m68k-*-*) 52 $1=-fpic 53 ;; 54 # FIXME: Override -fPIC default in libgcc only? 55 sh-*-linux* | sh[[2346lbe]]*-*-linux*) 56 $1=-fpic 57 ;; 58 # FIXME: Simplify to sh*-*-netbsd*? 59 sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \ 60 sh64-*-netbsd* | sh64l*-*-netbsd*) 61 $1=-fpic 62 ;; 63 # Default to -fPIC unless specified otherwise. 64 *) 65 $1=-fPIC 66 ;; 67esac 68 69# If the user explicitly uses -fpic/-fPIC, keep that. 70case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in 71 *-fpic*) 72 $1=-fpic 73 ;; 74 *-fPIC*) 75 $1=-fPIC 76 ;; 77esac 78]) 79 80# GCC_PICFLAG 81# ----------- 82# Store host PIC flag in PICFLAG. 83AC_DEFUN([GCC_PICFLAG], [ 84 AC_REQUIRE([AC_CANONICAL_HOST]) 85 _GCC_PICFLAG([PICFLAG], [host])]) 86 87# GCC_PICFLAG_FOR_TARGET 88# ---------------------- 89# Store target PIC flag in PICFLAG_FOR_TARGET. 90AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [ 91 AC_REQUIRE([AC_CANONICAL_TARGET]) 92 _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])]) 93