libctf/configure.ac

   1 dnl                                            -*- Autoconf -*-
   2 dnl Process this file with autoconf to produce a configure script.
   3 dnl
   4 dnl   Copyright (C) 2019-2023 Free Software Foundation, Inc.
   5 dnl
   6 dnl This file is free software; you can redistribute it and/or modify
   7 dnl it under the terms of the GNU General Public License as published by
   8 dnl the Free Software Foundation; either version 2 of the License, or
   9 dnl (at your option) any later version.
  10 dnl
  11 dnl This program is distributed in the hope that it will be useful,
  12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 dnl GNU General Public License for more details.
  15 dnl
  16 dnl You should have received a copy of the GNU General Public License
  17 dnl along with this program; see the file COPYING.  If not see
  18 dnl <http://www.gnu.org/licenses/>.
  19 dnl
  20
  21 AC_PREREQ(2.64)
  22 AC_INIT([libctf], 1.2.0)
  23 AC_CONFIG_SRCDIR(ctf-impl.h)
  24 AC_CANONICAL_BUILD
  25 AC_CANONICAL_HOST
  26 AC_CANONICAL_TARGET
  27 AC_USE_SYSTEM_EXTENSIONS
  28 AM_INIT_AUTOMAKE
  29 AM_SILENT_RULES([yes])
  30
  31 # Checks for programs.
  32 AC_PROG_MAKE_SET
  33 AC_PROG_CC
  34 AC_PROG_RANLIB
  35 AM_PROG_AR
  36 ZW_GNU_GETTEXT_SISTER_DIR
  37
  38 dnl Default to a non shared library.  This may be overridden by the
  39 dnl configure option --enable-shared.
  40 AC_DISABLE_SHARED
  41
  42 LT_INIT
  43 AC_SYS_LARGEFILE
  44 LT_OUTPUT
  45
  46 MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
  47 AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
  48 AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
  49 AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
  50
  51 # Figure out what compiler warnings we can enable.
  52 # See config/warnings.m4 for details.
  53
  54 ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wno-narrowing -Wwrite-strings \
  55                           -Wmissing-format-attribute], [warn])
  56 ACX_PROG_CC_WARNING_OPTS([-Wstrict-prototypes -Wmissing-prototypes \
  57                           -Wold-style-definition], [c_warn])
  58 ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
  59
  60 # Only enable with --enable-werror-always until existing warnings are
  61 # corrected.
  62 ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
  63
  64 AM_MAINTAINER_MODE
  65 AM_INSTALL_LIBBFD
  66 ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_libctf_warn_cflags])
  67
  68 AC_FUNC_MMAP
  69 # Needed for BFD capability checks.
  70 AC_SEARCH_LIBS(dlsym, dl)
  71 AM_ZLIB
  72
  73 GCC_ENABLE([libctf-hash-debugging], [no], [], [Enable expensive debugging of CTF deduplication type hashing])
  74 if test "${enable_libctf_hash_debugging}" = yes; then
  75     AC_DEFINE(ENABLE_LIBCTF_HASH_DEBUGGING, 1, [Enable expensive debugging of CTF deduplication type hashing])
  76 fi
  77 AM_CONDITIONAL(ENABLE_LIBCTF_HASH_DEBUGGING, test "${enable_libctf_hash_debugging}" = yes)
  78
  79 # Similar to GDB_AC_CHECK_BFD.
  80 OLD_CFLAGS=$CFLAGS
  81 OLD_LDFLAGS=$LDFLAGS
  82 OLD_LIBS=$LIBS
  83 OLD_CC=$CC
  84 # Put the old CFLAGS/LDFLAGS last, in case the user's (C|LD)FLAGS
  85 # points somewhere with bfd, with -I/foo/lib and -L/foo/lib.  We
  86 # always want our bfd.
  87 CC="./libtool --quiet --mode=link $OLD_CC"
  88 CFLAGS="-I${srcdir}/../include -I../bfd -I${srcdir}/../bfd $CFLAGS"
  89 LDFLAGS="-L../bfd -L../libiberty $LDFLAGS"
  90 intl=`echo $LIBINTL | sed 's,${top_builddir}/,,g'`
  91 LIBS="-lbfd -liberty $intl $LIBS"
  92 AC_CACHE_CHECK([for ELF support in BFD], ac_cv_libctf_bfd_elf,
  93 [AC_TRY_LINK([#include <stdlib.h>
  94              #include <string.h>
  95              #include "bfd.h"
  96              #include "elf-bfd.h"],
  97             [(void) bfd_section_from_elf_index (NULL, 0);
  98              return 0;],
  99             [ac_cv_libctf_bfd_elf=yes],
 100             [ac_cv_libctf_bfd_elf=no])])
 101 CFLAGS=$OLD_CFLAGS
 102 LDFLAGS=$OLD_LDFLAGS
 103 LIBS=$OLD_LIBS
 104 CC=$OLD_CC
 105
 106 if test $ac_cv_libctf_bfd_elf = yes; then
 107   AC_DEFINE([HAVE_BFD_ELF], 1,
 108             [Whether libbfd was configured for an ELF target.])
 109 fi
 110
 111 AC_C_BIGENDIAN
 112 AC_CHECK_HEADERS(byteswap.h endian.h)
 113 AC_CHECK_FUNCS(pread)
 114
 115 dnl Check for bswap_{16,32,64}
 116 AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64], [], [], [[#include <byteswap.h>]])
 117 AC_CHECK_DECLS([asprintf, vasprintf, stpcpy])
 118
 119 dnl Check for qsort_r.  (Taken from gnulib.)
 120 AC_CHECK_FUNCS_ONCE([qsort_r])
 121 if test $ac_cv_func_qsort_r = yes; then
 122   AC_CACHE_CHECK([for qsort_r signature], [ac_cv_libctf_qsort_r_signature],
 123     [AC_LINK_IFELSE(
 124        [AC_LANG_PROGRAM([[#undef qsort_r
 125                           #include <stdlib.h>
 126                           void qsort_r (void *, size_t, size_t,
 127                                         int (*) (void const *, void const *,
 128                                                  void *),
 129                                         void *);
 130                           void (*p) (void *, size_t, size_t,
 131                                      int (*) (void const *, void const *,
 132                                               void *),
 133                                      void *) = qsort_r;
 134                         ]])],
 135        [ac_cv_libctf_qsort_r_signature=GNU],
 136        [AC_LINK_IFELSE(
 137           [AC_LANG_PROGRAM([[#undef qsort_r
 138                              #include <stdlib.h>
 139                              void qsort_r (void *, size_t, size_t, void *,
 140                                            int (*) (void *,
 141                                                     void const *,
 142                                                     void const *));
 143                              void (*p) (void *, size_t, size_t, void *,
 144                                         int (*) (void *, void const *,
 145                                                  void const *)) = qsort_r;
 146                            ]])],
 147           [ac_cv_libctf_qsort_r_signature=BSD],
 148           [ac_cv_libctf_qsort_r_signature=unknown])])])
 149 fi
 150
 151 case x$ac_cv_libctf_qsort_r_signature in
 152   xGNU)     AC_DEFINE([HAVE_QSORT_R_ARG_LAST], 1,
 153              [Whether a qsort_r exists with a void *arg as its last arg.]);;
 154   xBSD)     AC_DEFINE([HAVE_QSORT_R_COMPAR_LAST], 1,
 155              [Whether a qsort_r exists with the compar function as its last arg.]);;
 156   *) ac_cv_libctf_qsort_r_signature=unknown;;
 157 esac
 158
 159 AM_CONDITIONAL(NEED_CTF_QSORT_R, test "${ac_cv_libctf_qsort_r_signature}" = unknown)
 160
 161 AC_CACHE_CHECK([for O_CLOEXEC], [ac_cv_libctf_macro_O_CLOEXEC],
 162   [AC_LINK_IFELSE(
 163     [AC_LANG_PROGRAM([[#include <fcntl.h>
 164                        #ifndef O_CLOEXEC
 165                          choke me;
 166                        #endif
 167                      ]],
 168                      [[return O_CLOEXEC;]])],
 169     [ac_cv_libctf_macro_O_CLOEXEC=yes],
 170     [ac_cv_libctf_macro_O_CLOEXEC=no])])
 171
 172 if test $ac_cv_libctf_macro_O_CLOEXEC = yes; then
 173   AC_DEFINE([HAVE_O_CLOEXEC], 1,
 174             [Whether the platform has a definition of O_CLOEXEC.])
 175 fi
 176
 177 build_info=
 178 makeinfo_too_old=
 179 AC_CHECK_PROGS([MAKEINFO], makeinfo, [$MISSING makeinfo])
 180 case " $build_configdirs " in
 181   *" texinfo "*) MAKEINFO='$$r/$(BUILD_SUBDIR)/texinfo/makeinfo/makeinfo' ;;
 182 esac
 183 changequote(,)
 184     # We require texinfo to be 6.3 or later, for a working synindex
 185     # and validatemenus: otherwise we fall back to /bin/true.
 186     if ${MAKEINFO} --version \
 187        | egrep 'texinfo[^0-9]*(6\.[3-9]|[7-9]|[1-6][0-9])' >/dev/null 2>&1; then
 188       build_info=yes
 189     else
 190         build_info=
 191         makeinfo_too_old=t
 192     fi
 193 changequote([,])
 194 if test -n "$makeinfo_too_old"; then
 195     AC_MSG_WARN([
 196 *** Makeinfo is too old. Info documentation will not be built.])
 197 fi
 198 AC_SUBST(MAKEINFO)
 199 AM_CONDITIONAL(BUILD_INFO, test "${build_info}" = yes)
 200
 201 CTF_LIBADD="-L`pwd`/../libiberty -liberty"
 202 SHARED_LDFLAGS=
 203
 204 # Horrible hacks to build DLLs on Windows and a shared library elsewhere.
 205 if test "$enable_shared" = "yes"; then
 206 # When building a shared libctf, link against the pic version of libiberty
 207 # so that apps that use libctf won't need libiberty just to satisfy any
 208 # libctf references.  We can't do that if a pic libiberty is unavailable
 209 # since including non-pic # code would insert text relocations into libctf.
 210 # Note that linking against libbfd as we do here, which is itself linked
 211 # against libiberty, may not satisfy all the libctf libiberty references
 212 # since libbfd may not pull in the entirety of libiberty.
 213 # Also, jam libintl into the right place in all of this: after libiberty,
 214 # which uses it, but before -lcygwin, which it uses.
 215 changequote(,)dnl
 216   x=`sed -n -e 's/^[    ]*PICFLAG[      ]*=[    ]*//p' < ../libiberty/Makefile | sed -n '$p'`
 217 changequote([,])dnl
 218   if test -n "$x"; then
 219     CTF_LIBADD="-L`pwd`/../libiberty/pic -liberty"
 220   fi
 221 fi
 222
 223 CTF_LIBADD="$CTF_LIBADD $LIBINTL"
 224
 225 if test "$enable_shared" = "yes"; then
 226   case "${host}" in
 227   # More hacks to build DLLs on Windows.
 228     *-*-cygwin*)
 229       SHARED_LDFLAGS="-no-undefined"
 230       CTF_LIBADD="$CTF_LIBADD -lcygwin"
 231       ;;
 232   esac
 233 fi
 234 AC_SUBST(SHARED_LDFLAGS)
 235 AC_SUBST(CTF_LIBADD)
 236
 237 AC_PATH_PROG([EXPECT], [expect])
 238 AC_CACHE_CHECK([for Tcl supporting try/catch], [ac_cv_libctf_tcl_try],
 239   [ac_cv_libctf_tcl_try=`if test -z $EXPECT; then echo no; else $EXPECT << EOF
 240 if @<:@llength @<:@info commands try@:>@@:>@ then { puts yes } else { puts no }
 241 EOF
 242 fi`
 243 ])
 244
 245 HAVE_TCL_TRY=false
 246 if test "${ac_cv_libctf_tcl_try}" = "yes"; then
 247     HAVE_TCL_TRY=true
 248 fi
 249 AC_SUBST(HAVE_TCL_TRY)
 250
 251 # Use a version script, if possible, or an -export-symbols-regex otherwise.
 252 decommented_version_script=
 253 AC_CACHE_CHECK([for linker versioning flags], [ac_cv_libctf_version_script],
 254   [echo 'FOO { global: mai*; local: ctf_fo*; };' > conftest.ver
 255    old_LDFLAGS="$LDFLAGS"
 256    old_CFLAGS="$CFLAGS"
 257    LDFLAGS="$LDFLAGS -shared -Wl,--version-script=conftest.ver"
 258    CFLAGS="$CFLAGS -fPIC"
 259    AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
 260                                     int main (void) { return ctf_foo(); }]])],
 261                   [ac_cv_libctf_version_script="-Wl,--version-script='$srcdir/libctf.ver'"],
 262                   [])
 263    LDFLAGS="$old_LDFLAGS"
 264
 265    if test -z "$ac_cv_libctf_version_script"; then
 266      LDFLAGS="$LDFLAGS -shared -Wl,-B,local -Wl,-z,gnu-version-script=conftest.ver"
 267      AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
 268                                       int main (void) { return ctf_foo(); }]])],
 269                     [ac_cv_libctf_version_script="-Wl,-B,local -Wl,-z,gnu-version-script"
 270                      decommented_version_script=t],
 271                     [])
 272      LDFLAGS="$old_LDFLAGS"
 273    fi
 274    CFLAGS="$old_CFLAGS"
 275
 276    if test -z "$ac_cv_libctf_version_script"; then
 277      ac_cv_libctf_version_script='-export-symbols-regex ctf_.*'
 278    fi
 279    rm -f conftest.ver])
 280 if test -n "$decommented_version_script"; then
 281    # Solaris's version scripts use shell-style comments rather than the C-style
 282    # used by GNU ld.  Use cpp to strip the comments out.  (cpp exists under this
 283    # name on all platforms that support ld -z gnu-version-script.)
 284    # Also ensure that no symbols exist in the version script for libctf-nobfd.so
 285    # that do not exist in the shared library itself, since some linkers add such
 286    # symbols with type NOTYPE.
 287    /lib/cpp < $srcdir/libctf.ver > libctf-decommented.ver
 288    grep -v 'libctf only' $srcdir/libctf.ver | /lib/cpp > libctf-nobfd-decommented.ver
 289    VERSION_FLAGS="$ac_cv_libctf_version_script='libctf-decommented.ver'"
 290    VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script='libctf-nobfd-decommented.ver'"
 291 else
 292    VERSION_FLAGS="$ac_cv_libctf_version_script"
 293    VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script"
 294 fi
 295 AC_SUBST(VERSION_FLAGS)
 296 AC_SUBST(VERSION_FLAGS_NOBFD)
 297
 298 AC_CONFIG_FILES(Makefile)
 299 AC_CONFIG_HEADERS(config.h)
 300 AC_OUTPUT
 301
 302 GNU_MAKE_JOBSERVER