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