1# Process this file with autoconf to produce a configure script, like so:
2# aclocal -I .. -I ../config && autoconf && autoheader && automake
3
4AC_PREREQ(2.64)
5AC_INIT(libmudflap, 1.0)
6AC_CONFIG_SRCDIR(mf-runtime.c)
7AC_CANONICAL_SYSTEM
8ACX_NONCANONICAL_TARGET
9
10AM_INIT_AUTOMAKE([no-dist])
11
12AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
13AC_ARG_ENABLE(version-specific-runtime-libs,
14[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
15[case "$enableval" in
16 yes) version_specific_libs=yes ;;
17 no)  version_specific_libs=no ;;
18 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
19 esac],
20[version_specific_libs=no])
21AC_MSG_RESULT($version_specific_libs)
22
23AM_MAINTAINER_MODE
24AC_EXEEXT
25
26AM_ENABLE_MULTILIB(, ..)
27
28target_alias=${target_alias-$host_alias}
29AC_SUBST(target_alias)
30
31AC_CONFIG_HEADERS(config.h)
32
33AC_LANG_C
34# The same as in boehm-gc and libstdc++. Have to borrow it from there.
35# We must force CC to /not/ be precious variables; otherwise
36# the wrong, non-multilib-adjusted value will be used in multilibs.
37# As a side effect, we have to subst CFLAGS ourselves.
38
39m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
40m4_define([_AC_ARG_VAR_PRECIOUS],[])
41AC_PROG_CC
42m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
43
44AC_SUBST(CFLAGS)
45
46if test "x$GCC" != "xyes"; then
47  AC_MSG_ERROR([libmudflap must be built with GCC])
48fi
49AC_PROG_CPP
50
51# Some hosts don't have dlsym(RTLD_NEXT, "symbol") for use in
52# symbol interposition.  We disable shared libraries for these.
53AC_MSG_CHECKING([whether dlsym(RTLD_NEXT,...) is available])
54AC_TRY_COMPILE([
55#define _GNU_SOURCE
56#include <dlfcn.h>
57],
58[void *foo = dlsym (RTLD_NEXT, "exit");],
59[AC_MSG_RESULT(yes)],
60[AC_MSG_RESULT(no)
61enable_shared=no])
62
63AC_CHECK_HEADERS(stdint.h execinfo.h signal.h dlfcn.h dirent.h pwd.h grp.h \
64  netdb.h sys/ipc.h sys/sem.h sys/shm.h sys/wait.h ctype.h mntent.h \
65  sys/mnttab.h sys/socket.h netinet/in.h arpa/inet.h dlfcn.h sys/mman.h)
66
67AC_CHECK_FUNCS(backtrace backtrace_symbols gettimeofday signal)
68AC_CHECK_FUNCS(fopen64 fseeko64 ftello64 stat64 freopen64)
69AC_CHECK_FUNCS(setbuf setbuffer setlinebuf setvbuf)
70AC_CHECK_FUNCS(strnlen memrchr strncpy memmem sethostname)
71AC_CHECK_FUNCS(__ctype_b_loc __ctype_tolower_loc __ctype_toupper_loc)
72AC_CHECK_FUNCS(getlogin cuserid getpwnam getpwuid getpwent getgrnam getgrgid getgrent)
73AC_CHECK_FUNCS(getlogin_r getpwnam_r getpwuid_r getgrnam_r getgrgid_r)
74AC_CHECK_FUNCS(getservent getservbyname getservbyport getaddrinfo gai_strerror)
75AC_CHECK_FUNCS(getprotoent getprotobyname getprotobynumber)
76AC_CHECK_FUNCS(getmntent setmntent addmntent)
77AC_CHECK_FUNCS(inet_ntoa mmap munmap)
78AC_CHECK_FUNCS(mmap64)
79AC_CHECK_FUNCS(__libc_freeres)
80AC_CHECK_FUNCS(rawmemchr stpcpy mempcpy)
81
82AC_TRY_COMPILE([#include <sys/types.h>
83#include <sys/ipc.h>
84#include <sys/sem.h>],[union semun foo;], [mf_have_semun=1], [mf_have_semun=0])
85if test $mf_have_semun = 1
86then
87  AC_DEFINE(HAVE_UNION_SEMUN, 1, [union semun defined in sys/ipc.h or sys/sem.h])
88fi
89
90
91AC_MSG_CHECKING([for socklen_t in sys/socket.h])
92AC_TRY_COMPILE([#define _POSIX_PII_SOCKET
93#include <sys/types.h>
94#include <sys/socket.h>], [socklen_t x = 5;],
95  [AC_DEFINE(HAVE_SOCKLEN_T, 1, [Define it socklen_t typedef is in sys/socket.h.])
96   AC_MSG_RESULT(yes)],
97  [AC_MSG_RESULT(no)])
98
99AC_LIBTOOL_DLOPEN
100AM_PROG_LIBTOOL
101AC_SUBST(enable_shared)
102AC_SUBST(enable_static)
103
104AC_CHECK_HEADER(stdint.h, [MF_HAVE_STDINT_H=1], [MF_HAVE_STDINT_H=0])
105AC_SUBST(MF_HAVE_STDINT_H)
106if test $MF_HAVE_STDINT_H = 1
107then
108   MF_HAVE_UINTPTR_T=1
109else
110   AC_TRY_COMPILE([#include <sys/types.h>], [uintptr_t k = 0;],
111	[MF_HAVE_UINTPTR_T=1], [MF_HAVE_UINTPTR_T=0])
112fi
113AC_SUBST(MF_HAVE_UINTPTR_T)
114
115AC_CHECK_HEADERS(pthread.h)
116
117AC_MSG_CHECKING([for thread model used by GCC])
118target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
119AC_MSG_RESULT([$target_thread_file])
120
121# We only support posix threads, or no threads at all.
122posix_threads=
123case ${target_thread_file} in
124  posix)
125    posix_threads=yes
126    ;;
127  single)
128    ;;
129  *)
130    echo "${target_thread_file} is an unsupported thread package" 1>&2
131    exit 1
132    ;;
133esac
134
135AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$posix_threads" != "x"])
136if test "x$posix_threads" != "x"
137then
138        build_libmudflapth=1
139else
140        build_libmudflapth=0
141fi
142AC_SUBST(build_libmudflapth)
143
144AC_CHECK_LIB(dl, dlsym)
145
146AC_CHECK_FUNC(connect,, AC_CHECK_LIB(socket, connect))
147AC_CHECK_FUNC(sched_yield,, AC_CHECK_LIB(rt, sched_yield))
148
149# Calculate toolexeclibdir
150# Also toolexecdir, though it's only used in toolexeclibdir
151case ${version_specific_libs} in
152  yes)
153    # Need the gcc compiler version to know where to install libraries
154    # and header files if --enable-version-specific-runtime-libs option
155    # is selected.
156    toolexecdir='$(libdir)/gcc/$(target_alias)'
157    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
158    ;;
159  no)
160    if test -n "$with_cross_host" &&
161       test x"$with_cross_host" != x"no"; then
162      # Install a library built with a cross compiler in tooldir, not libdir.
163      toolexecdir='$(exec_prefix)/$(target_alias)'
164      toolexeclibdir='$(toolexecdir)/lib'
165    else
166      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
167      toolexeclibdir='$(libdir)'
168    fi
169    multi_os_directory=`$CC -print-multi-os-directory`
170    case $multi_os_directory in
171      .) ;; # Avoid trailing /.
172      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
173    esac
174    ;;
175esac
176AC_SUBST(toolexecdir)
177AC_SUBST(toolexeclibdir)
178
179includedir=${toolexecdir}/include
180AC_SUBST(includedir)
181
182pthread_create_version='""'
183if test "x$enable_shared" = "xyes" && test "x$posix_threads" != "x"; then
184  # NB: don't check for -lpthread here, because then it would be
185  # added to LIBS.  For the thread-unaware libmudflap.la, we don't
186  # want it there.
187
188  # glibc-related hacks.  dlsym() may pick the wrong version of
189  # interposed functions like pthread_create on modern glibc.
190  # We need to find the proper symbol version string, and use
191  # the nonstandard dlvsym().
192  AC_CHECK_FUNCS(dlvsym)
193  AC_CHECK_TOOL(NM, nm)
194  if test "x$ac_cv_have_dlvsym" != "x"; then
195    # Try compiling a simple pthreads program.  Find the shared libraries it
196    # ends up with.  Then use "nm" on those libraries to extract the
197    # default symbol versioning suffix ("@@"), if any.  But that's tricky.
198    # Rather, run nm on the resulting executable.  Unfortunately, autoconf
199    # doesn't appear to have a macro that builds a test executable for
200    # subsequent analysis ... so we do it by hand here.
201    cat >> conftest.c << EOF
202#include <pthread.h>
203int main () { void *p = (void *) & pthread_create; return (int) p; }
204EOF
205    oldLIBS="$LIBS"
206    LIBS="$LIBS -lpthread"
207    pthread_create_version="\"\""
208    AC_MSG_CHECKING(pthread_create symbol version)
209    if eval $ac_link 2>&5 && test -s conftest${ac_exeext}; then
210      version=`$NM conftest${ac_exeect} | grep 'pthread_create@@' | sed -e 's/^.*@@//'`
211      if test "x$version" != "x"; then
212        pthread_create_version="\"$version\""
213      fi
214    fi
215    AC_MSG_RESULT($pthread_create_version)
216    LIBS="$oldLIBS"
217  fi
218fi
219AC_DEFINE_UNQUOTED(PTHREAD_CREATE_VERSION, $pthread_create_version, [pthread_create symbol version])
220
221
222# Figure out whether the compiler supports "-ffunction-sections -fdata-sections",
223# similarly to how libstdc++ does it
224ac_test_CFLAGS="${CFLAGS+set}"
225ac_save_CFLAGS="$CFLAGS"
226
227# Check for -ffunction-sections -fdata-sections
228AC_MSG_CHECKING([for gcc that supports -ffunction-sections -fdata-sections])
229CFLAGS='-Werror -ffunction-sections -fdata-sections'
230AC_TRY_COMPILE(, [int foo;], [ac_fdsections=yes], [ac_fdsections=no])
231if test "$ac_test_CFLAGS" = set; then
232  CFLAGS="$ac_save_CFLAGS"
233else
234  # this is the suspicious part
235  CFLAGS=""
236fi
237if test x"$ac_fdsections" = x"yes"; then
238  SECTION_FLAGS='-ffunction-sections -fdata-sections'
239fi
240AC_MSG_RESULT($ac_fdsections)
241AC_SUBST(SECTION_FLAGS)
242
243
244# Check for the name of the symbol used for the entry point.
245AC_CACHE_CHECK([for the name of the symbol used for the entry point],
246  [mudflap_cv_entry_point], [
247for name in _start __start unknown; do
248  AC_LINK_IFELSE([AC_LANG_PROGRAM([extern char $name@<:@@:>@;], [$name@<:@0@:>@ = 0;])],
249		 [break])
250done
251mudflap_cv_entry_point="$name"])
252if test "$mudflap_cv_entry_point" = unknown; then
253  AC_MSG_ERROR([none of the known symbol names works])
254fi
255AC_DEFINE_UNQUOTED([ENTRY_POINT], [$mudflap_cv_entry_point],
256  [Define to the name of the symbol used for the entry point.])
257
258
259if test ${multilib} = yes; then
260  multilib_arg="--enable-multilib"
261else
262  multilib_arg=
263fi
264
265# See if we support thread-local storage.
266GCC_CHECK_TLS
267GCC_CHECK_EMUTLS
268
269AC_CONFIG_FILES([Makefile testsuite/Makefile testsuite/mfconfig.exp])
270AC_OUTPUT
271