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 "${$2}" in 8 # PIC is the default on some targets or must not be used. 9 *-*-darwin*) 10 # For darwin, common symbols are not allowed in MH_DYLIB files 11 case "${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 loongarch*-*-*) 48 $1=-fpic 49 ;; 50 mips-sgi-irix6*) 51 # PIC is the default. 52 ;; 53 rs6000-ibm-aix* | powerpc-ibm-aix*) 54 # All AIX code is PIC. 55 ;; 56 57 # Some targets support both -fPIC and -fpic, but prefer the latter. 58 # FIXME: Why? 59 i[[34567]]86-*-* | x86_64-*-*) 60 $1=-fpic 61 ;; 62 # FIXME: Override -fPIC default in libgcc only? 63 sh-*-linux* | sh[[2346lbe]]*-*-linux*) 64 $1=-fpic 65 ;; 66 sh*-*-netbsd*) 67 $1=-fpic 68 ;; 69 # Default to -fPIC unless specified otherwise. 70 *) 71 $1=-fPIC 72 ;; 73esac 74 75# If the user explicitly uses -fpic/-fPIC, keep that. 76case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in 77 *-fpic*) 78 $1=-fpic 79 ;; 80 *-fPIC*) 81 $1=-fPIC 82 ;; 83esac 84]) 85 86# GCC_PICFLAG 87# ----------- 88# Store host PIC flag in PICFLAG. 89AC_DEFUN([GCC_PICFLAG], [ 90 AC_REQUIRE([AC_CANONICAL_HOST]) 91 _GCC_PICFLAG([PICFLAG], [host])]) 92 93# GCC_PICFLAG_FOR_TARGET 94# ---------------------- 95# Store target PIC flag in PICFLAG_FOR_TARGET. 96AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [ 97 AC_REQUIRE([AC_CANONICAL_TARGET]) 98 _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])]) 99