configure.ac revision 1.1.1.1 
1dnl                                            -*- Autoconf -*-
2dnl Process this file with autoconf to produce a configure script.
3dnl
4dnl   Copyright (C) 2019-2020 Free Software Foundation, Inc.
5dnl
6dnl This file is free software; you can redistribute it and/or modify
7dnl it under the terms of the GNU General Public License as published by
8dnl the Free Software Foundation; either version 2 of the License, or
9dnl (at your option) any later version.
10dnl
11dnl This program is distributed in the hope that it will be useful,
12dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
13dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14dnl GNU General Public License for more details.
15dnl
16dnl You should have received a copy of the GNU General Public License
17dnl along with this program; see the file COPYING.  If not see
18dnl <http://www.gnu.org/licenses/>.
19dnl
20
21AC_PREREQ(2.64)
22AC_INIT([libctf], 1.2.0)
23AC_CONFIG_SRCDIR(ctf-impl.h)
24AC_CONFIG_MACRO_DIR(../config)
25AC_CONFIG_MACRO_DIR(../bfd)
26AC_USE_SYSTEM_EXTENSIONS
27AM_INIT_AUTOMAKE
28
29# Checks for programs.
30AC_PROG_MAKE_SET
31AC_PROG_CC
32AC_PROG_RANLIB
33AM_PROG_AR
34ZW_GNU_GETTEXT_SISTER_DIR
35
36dnl Default to a non shared library.  This may be overridden by the
37dnl configure option --enable-shared.
38AC_DISABLE_SHARED
39
40LT_INIT
41AC_SYS_LARGEFILE
42
43MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
44AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
45AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
46AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
47
48# Figure out what compiler warnings we can enable.
49# See config/warnings.m4 for details.
50
51ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wno-narrowing -Wwrite-strings \
52			  -Wmissing-format-attribute], [warn])
53ACX_PROG_CC_WARNING_OPTS([-Wstrict-prototypes -Wmissing-prototypes \
54			  -Wold-style-definition], [c_warn])
55ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
56
57# Only enable with --enable-werror-always until existing warnings are
58# corrected.
59ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
60
61AM_MAINTAINER_MODE
62AM_INSTALL_LIBBFD
63ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_libctf_warn_cflags])
64
65AC_FUNC_MMAP
66# Needed for BFD capability checks.
67AC_SEARCH_LIBS(dlopen, dl)
68AM_ZLIB
69
70GCC_ENABLE([libctf-hash-debugging], [no], [], [Enable expensive debugging of CTF deduplication type hashing])
71if test "${enable_libctf_hash_debugging}" = yes; then
72    AC_DEFINE(ENABLE_LIBCTF_HASH_DEBUGGING, 1, [Enable expensive debugging of CTF deduplication type hashing])
73fi
74AM_CONDITIONAL(ENABLE_LIBCTF_HASH_DEBUGGING, test "${enable_libctf_hash_debugging}" = yes)
75
76# Similar to GDB_AC_CHECK_BFD.
77OLD_CFLAGS=$CFLAGS
78OLD_LDFLAGS=$LDFLAGS
79OLD_LIBS=$LIBS
80# Put the old CFLAGS/LDFLAGS last, in case the user's (C|LD)FLAGS
81# points somewhere with bfd, with -I/foo/lib and -L/foo/lib.  We
82# always want our bfd.
83CFLAGS="-I${srcdir}/../include -I../bfd -I${srcdir}/../bfd $CFLAGS"
84ZLIBDIR=`echo $zlibdir | sed 's,\$(top_builddir)/,,g'`
85LDFLAGS="-L../bfd -L../libiberty $ZLIBDIR $LDFLAGS"
86intl=`echo $LIBINTL | sed 's,${top_builddir}/,,g'`
87LIBS="-lbfd -liberty -lz $intl $LIBS"
88AC_CACHE_CHECK([for ELF support in BFD], ac_cv_libctf_bfd_elf,
89[AC_TRY_LINK([#include <stdlib.h>
90	     #include "bfd.h"
91	     #include "elf-bfd.h"],
92	    [(void) bfd_section_from_elf_index (NULL, 0);
93	     return 0;],
94	    [ac_cv_libctf_bfd_elf=yes],
95	    [ac_cv_libctf_bfd_elf=no])])
96CFLAGS=$OLD_CFLAGS
97LDFLAGS=$OLD_LDFLAGS
98LIBS=$OLD_LIBS
99
100if test $ac_cv_libctf_bfd_elf = yes; then
101  AC_DEFINE([HAVE_BFD_ELF], 1,
102	    [Whether libbfd was configured for an ELF target.])
103fi
104
105AC_C_BIGENDIAN
106AC_CHECK_HEADERS(byteswap.h endian.h)
107AC_CHECK_FUNCS(pread)
108
109dnl Check for bswap_{16,32,64}
110AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64], [], [], [[#include <byteswap.h>]])
111AC_CHECK_DECLS([asprintf, vasprintf, stpcpy])
112
113dnl Check for qsort_r.  (Taken from gnulib.)
114AC_CHECK_FUNCS_ONCE([qsort_r])
115if test $ac_cv_func_qsort_r = yes; then
116  AC_CACHE_CHECK([for qsort_r signature], [ac_cv_libctf_qsort_r_signature],
117    [AC_LINK_IFELSE(
118       [AC_LANG_PROGRAM([[#undef qsort_r
119                          #include <stdlib.h>
120                          void qsort_r (void *, size_t, size_t,
121                                        int (*) (void const *, void const *,
122                                                 void *),
123                                        void *);
124                          void (*p) (void *, size_t, size_t,
125                                     int (*) (void const *, void const *,
126                                              void *),
127                                     void *) = qsort_r;
128                        ]])],
129       [ac_cv_libctf_qsort_r_signature=GNU],
130       [AC_LINK_IFELSE(
131          [AC_LANG_PROGRAM([[#undef qsort_r
132	                     #include <stdlib.h>
133                             void qsort_r (void *, size_t, size_t, void *,
134                                           int (*) (void *,
135                                                    void const *,
136                                                    void const *));
137                             void (*p) (void *, size_t, size_t, void *,
138                                        int (*) (void *, void const *,
139                                                 void const *)) = qsort_r;
140                           ]])],
141          [ac_cv_libctf_qsort_r_signature=BSD],
142          [ac_cv_libctf_qsort_r_signature=unknown])])])
143fi
144
145case x$ac_cv_libctf_qsort_r_signature in
146  xGNU)     AC_DEFINE([HAVE_QSORT_R_ARG_LAST], 1,
147	     [Whether a qsort_r exists with a void *arg as its last arg.]);;
148  xBSD)     AC_DEFINE([HAVE_QSORT_R_COMPAR_LAST], 1,
149	     [Whether a qsort_r exists with the compar function as its last arg.]);;
150  *) ac_cv_libctf_qsort_r_signature=unknown;;
151esac
152
153AM_CONDITIONAL(NEED_CTF_QSORT_R, test "${ac_cv_libctf_qsort_r_signature}" = unknown)
154
155AC_CACHE_CHECK([for O_CLOEXEC], [ac_cv_libctf_macro_O_CLOEXEC],
156  [AC_LINK_IFELSE(
157    [AC_LANG_PROGRAM([[#include <fcntl.h>
158                       #ifndef O_CLOEXEC
159                         choke me;
160                       #endif
161                     ]],
162                     [[return O_CLOEXEC;]])],
163    [ac_cv_libctf_macro_O_CLOEXEC=yes],
164    [ac_cv_libctf_macro_O_CLOEXEC=no])])
165
166if test $ac_cv_libctf_macro_O_CLOEXEC = yes; then
167  AC_DEFINE([HAVE_O_CLOEXEC], 1,
168	    [Whether the platform has a definition of O_CLOEXEC.])
169fi
170
171# Horrible hacks to build DLLs on Windows and a shared library elsewhere.
172SHARED_LIBADD=
173SHARED_LDFLAGS=
174BFD_LIBADD=
175BFD_DEPENDENCIES=
176if test "$enable_shared" = "yes"; then
177# When building a shared libctf, link against the pic version of libiberty
178# so that apps that use libctf won't need libiberty just to satisfy any
179# libctf references.
180# We can't do that if a pic libiberty is unavailable since including non-pic
181# code would insert text relocations into libctf.
182# Note that linking against libbfd as we do here, which is itself linked
183# against libiberty, may not satisfy all the libctf libiberty references
184# since libbfd may not pull in the entirety of libiberty.
185changequote(,)dnl
186  x=`sed -n -e 's/^[ 	]*PICFLAG[ 	]*=[ 	]*//p' < ../libiberty/Makefile | sed -n '$p'`
187changequote([,])dnl
188  if test -n "$x"; then
189    SHARED_LIBADD="-L`pwd`/../libiberty/pic -liberty"
190  fi
191
192  case "${host}" in
193  # More hacks to build DLLs on Windows.
194    *-*-cygwin*)
195      SHARED_LDFLAGS="-no-undefined"
196      SHARED_LIBADD="-L`pwd`/../libiberty -liberty -L`pwd`/../intl -lintl -lcygwin"
197      BFD_LIBADD="-L`pwd`/../bfd -lbfd"
198      ;;
199
200    *-*-darwin*)
201      BFD_LIBADD="-Wl,`pwd`/../bfd/.libs/libbfd.dylib"
202      BFD_DEPENDENCIES="../bfd/libbfd.la"
203      ;;
204    *)
205      case "$host_vendor" in
206	hp)
207	  BFD_LIBADD="-Wl,`pwd`/../bfd/.libs/libbfd.sl"
208	  ;;
209	*)
210	  BFD_LIBADD="-Wl,`pwd`/../bfd/.libs/libbfd.so"
211	  ;;
212      esac
213      BFD_DEPENDENCIES="../bfd/libbfd.la"
214      ;;
215  esac
216fi
217AC_SUBST(SHARED_LDFLAGS)
218AC_SUBST(SHARED_LIBADD)
219AC_SUBST(BFD_LIBADD)
220AC_SUBST(BFD_DEPENDENCIES)
221
222# Use a version script, if possible, or an -export-symbols-regex otherwise.
223VERSION_FLAGS='-export-symbols-regex ctf_.*'
224if $LD --help 2>&1 | grep -- --version-script >/dev/null; then
225    VERSION_FLAGS="-Wl,--version-script='$srcdir/libctf.ver'"
226fi
227AC_SUBST(VERSION_FLAGS)
228
229AC_CONFIG_FILES(Makefile)
230AC_CONFIG_HEADERS(config.h)
231AC_OUTPUT
232