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77008252 | 1 | # Process this file with autoconf to produce a configure script, like so: |
f2b5129c MM |
2 | # |
3 | # aclocal -I .. -I ../config && autoconf && autoheader && automake | |
77008252 JJ |
4 | |
5 | AC_PREREQ(2.59) | |
6 | AC_INIT(libssp, 1.0) | |
7 | AC_CONFIG_SRCDIR(ssp.c) | |
8 | AC_CANONICAL_SYSTEM | |
f2b5129c | 9 | ACX_NONCANONICAL_TARGET |
77008252 JJ |
10 | |
11 | AM_INIT_AUTOMAKE | |
12 | ||
13 | AC_MSG_CHECKING([for --enable-version-specific-runtime-libs]) | |
14 | AC_ARG_ENABLE(version-specific-runtime-libs, | |
15 | [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ], | |
16 | [case "$enableval" in | |
17 | yes) version_specific_libs=yes ;; | |
18 | no) version_specific_libs=no ;; | |
19 | *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);; | |
20 | esac], | |
21 | [version_specific_libs=no]) | |
22 | AC_MSG_RESULT($version_specific_libs) | |
23 | ||
24 | AM_MAINTAINER_MODE | |
be14fe72 JM |
25 | |
26 | GCC_NO_EXECUTABLES | |
77008252 JJ |
27 | |
28 | AM_ENABLE_MULTILIB(, ..) | |
29 | ||
30 | target_alias=${target_alias-$host_alias} | |
31 | AC_SUBST(target_alias) | |
32 | ||
33 | AC_CONFIG_HEADERS(config.h) | |
34 | ||
35 | AC_LANG_C | |
36 | # The same as in boehm-gc and libstdc++. Have to borrow it from there. | |
37 | # We must force CC to /not/ be precious variables; otherwise | |
38 | # the wrong, non-multilib-adjusted value will be used in multilibs. | |
39 | # As a side effect, we have to subst CFLAGS ourselves. | |
40 | ||
41 | m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS]) | |
42 | m4_define([_AC_ARG_VAR_PRECIOUS],[]) | |
43 | AC_PROG_CC | |
44 | m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS]) | |
45 | ||
46 | AC_SUBST(CFLAGS) | |
47 | ||
48 | if test "x$GCC" != "xyes"; then | |
49 | AC_MSG_ERROR([libssp must be built with GCC]) | |
50 | fi | |
51 | AC_PROG_CPP | |
52 | ||
53 | AC_MSG_CHECKING([whether -fstack-protector works]) | |
54 | save_CFLAGS="$CFLAGS" | |
55 | CFLAGS="$CFLAGS -fstack-protector -Werror" | |
56 | AC_TRY_COMPILE([ | |
57 | void __attribute__((noinline)) bar (char *x) | |
58 | { | |
59 | __builtin_memset (x, 0, 64); | |
60 | }],[char buf[64]; bar (buf);], | |
61 | [AC_MSG_RESULT(yes)], | |
62 | [AC_MSG_RESULT(no)]) | |
63 | CFLAGS="$save_CFLAGS" | |
64 | ||
65 | AC_MSG_CHECKING([whether hidden visibility is supported]) | |
66 | AC_TRY_COMPILE([ | |
67 | void __attribute__((visibility ("hidden"))) bar (void) {}],, | |
68 | [ssp_hidden=yes],[ssp_hidden=no]) | |
69 | AC_MSG_RESULT($ssp_hidden) | |
70 | if test x$ssp_hidden = xyes; then | |
71 | AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported]) | |
72 | fi | |
73 | ||
74 | AC_MSG_CHECKING([whether symbol versioning is supported]) | |
75 | cat > conftest.map <<EOF | |
76 | FOO_1.0 { | |
77 | global: *foo*; bar; local: *; | |
78 | }; | |
79 | EOF | |
80 | save_LDFLAGS="$LDFLAGS" | |
b615db81 | 81 | LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map" |
be14fe72 JM |
82 | if test x$gcc_no_link = xyes; then |
83 | # If we cannot link, we cannot build shared libraries, so do not use | |
84 | # symbol versioning. | |
85 | ssp_use_symver=no | |
86 | else | |
87 | AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no]) | |
88 | fi | |
77008252 JJ |
89 | LDFLAGS="$save_LDFLAGS" |
90 | AC_MSG_RESULT($ssp_use_symver) | |
91 | AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes]) | |
92 | ||
93 | AC_CHECK_HEADERS(alloca.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h) | |
94 | ||
be14fe72 JM |
95 | if test x$gcc_no_link = xyes; then |
96 | # Presume the ISO C functions are available; add target-specific | |
97 | # configuration here if required. | |
98 | AC_DEFINE(HAVE_STRNCPY) | |
99 | AC_DEFINE(HAVE_STRNCAT) | |
100 | else | |
101 | AC_CHECK_FUNCS(mempcpy strncpy strncat) | |
102 | fi | |
77008252 JJ |
103 | |
104 | AC_MSG_CHECKING([whether vsnprintf is usable]) | |
105 | AC_RUN_IFELSE(AC_LANG_PROGRAM([ | |
106 | #include <stdarg.h> | |
107 | #include <string.h> | |
108 | #include <stdio.h> | |
109 | int foo (char *buf, size_t n, const char *fmt, ...) | |
110 | { | |
111 | va_list ap; | |
112 | int ret; | |
113 | va_start (ap, fmt); | |
114 | ret = vsnprintf (buf, n, fmt, ap); | |
115 | va_end (ap); | |
116 | return ret; | |
117 | }], | |
118 | [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf)); | |
119 | if (foo (buf, 4, ".%s.", "CDEFG") != 7) | |
120 | return 1; | |
121 | return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]), | |
122 | [ssp_have_usable_vsnprintf=define], | |
123 | [ssp_have_usable_vsnprintf=undef], | |
124 | [ssp_have_usable_vsnprintf=undef]) | |
125 | if test "x$ssp_have_usable_vsnprintf" = xdefine; then | |
126 | AC_MSG_RESULT(yes) | |
127 | AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works]) | |
128 | else | |
129 | AC_MSG_RESULT(no) | |
130 | fi | |
131 | AC_SUBST(ssp_have_usable_vsnprintf) | |
132 | ||
133 | AM_PROG_LIBTOOL | |
134 | AC_SUBST(enable_shared) | |
135 | AC_SUBST(enable_static) | |
136 | ||
137 | # Calculate toolexeclibdir | |
138 | # Also toolexecdir, though it's only used in toolexeclibdir | |
139 | case ${version_specific_libs} in | |
140 | yes) | |
141 | # Need the gcc compiler version to know where to install libraries | |
142 | # and header files if --enable-version-specific-runtime-libs option | |
143 | # is selected. | |
144 | toolexecdir='$(libdir)/gcc/$(target_alias)' | |
145 | toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)' | |
146 | ;; | |
147 | no) | |
148 | if test -n "$with_cross_host" && | |
149 | test x"$with_cross_host" != x"no"; then | |
150 | # Install a library built with a cross compiler in tooldir, not libdir. | |
151 | toolexecdir='$(exec_prefix)/$(target_alias)' | |
152 | toolexeclibdir='$(toolexecdir)/lib' | |
153 | else | |
154 | toolexecdir='$(libdir)/gcc-lib/$(target_alias)' | |
155 | toolexeclibdir='$(libdir)' | |
156 | fi | |
157 | multi_os_directory=`$CC -print-multi-os-directory` | |
158 | case $multi_os_directory in | |
159 | .) ;; # Avoid trailing /. | |
160 | *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;; | |
161 | esac | |
162 | ;; | |
163 | esac | |
164 | AC_SUBST(toolexecdir) | |
165 | AC_SUBST(toolexeclibdir) | |
166 | ||
167 | if test ${multilib} = yes; then | |
168 | multilib_arg="--enable-multilib" | |
169 | else | |
170 | multilib_arg= | |
171 | fi | |
172 | ||
173 | AC_CONFIG_FILES([Makefile ssp/ssp.h]) | |
174 | AC_OUTPUT |