libctf/configure.ac

   1 dnl                                            -*- Autoconf -*-
   2 dnl Process this file with autoconf to produce a configure script.
   3 dnl
   4 dnl   Copyright (C) 2019-2022 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_CONFIG_MACRO_DIR(..)
  25 AC_CONFIG_MACRO_DIR(../config)
  26 AC_CONFIG_MACRO_DIR(../bfd)
  27 AC_CANONICAL_BUILD
  28 AC_CANONICAL_HOST
  29 AC_CANONICAL_TARGET
  30 AC_USE_SYSTEM_EXTENSIONS
  31 AM_INIT_AUTOMAKE
  32 AM_SILENT_RULES([yes])
  33
  34 # Checks for programs.
  35 AC_PROG_MAKE_SET
  36 AC_PROG_CC
  37 AC_PROG_RANLIB
  38 AM_PROG_AR
  39 ZW_GNU_GETTEXT_SISTER_DIR
  40
  41 dnl Default to a non shared library.  This may be overridden by the
  42 dnl configure option --enable-shared.
  43 AC_DISABLE_SHARED
  44
  45 LT_INIT
  46 AC_SYS_LARGEFILE
  47
  48 MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
  49 AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
  50 AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
  51 AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
  52
  53 # Figure out what compiler warnings we can enable.
  54 # See config/warnings.m4 for details.
  55
  56 ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wno-narrowing -Wwrite-strings \
  57                           -Wmissing-format-attribute], [warn])
  58 ACX_PROG_CC_WARNING_OPTS([-Wstrict-prototypes -Wmissing-prototypes \
  59                           -Wold-style-definition], [c_warn])
  60 ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
  61
  62 # Only enable with --enable-werror-always until existing warnings are
  63 # corrected.
  64 ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
  65
  66 AM_MAINTAINER_MODE
  67 AM_INSTALL_LIBBFD
  68 ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_libctf_warn_cflags])
  69
  70 AC_FUNC_MMAP
  71 # Needed for BFD capability checks.
  72 AC_SEARCH_LIBS(dlsym, dl)
  73 AM_ZLIB
  74 AC_ZSTD
  75
  76 GCC_ENABLE([libctf-hash-debugging], [no], [], [Enable expensive debugging of CTF deduplication type hashing])
  77 if test "${enable_libctf_hash_debugging}" = yes; then
  78     AC_DEFINE(ENABLE_LIBCTF_HASH_DEBUGGING, 1, [Enable expensive debugging of CTF deduplication type hashing])
  79 fi
  80 AM_CONDITIONAL(ENABLE_LIBCTF_HASH_DEBUGGING, test "${enable_libctf_hash_debugging}" = yes)
  81
  82 # Similar to GDB_AC_CHECK_BFD.
  83 OLD_CFLAGS=$CFLAGS
  84 OLD_LDFLAGS=$LDFLAGS
  85 OLD_LIBS=$LIBS
  86 # Put the old CFLAGS/LDFLAGS last, in case the user's (C|LD)FLAGS
  87 # points somewhere with bfd, with -I/foo/lib and -L/foo/lib.  We
  88 # always want our bfd.
  89 CFLAGS="-I${srcdir}/../include -I../bfd -I${srcdir}/../bfd $CFLAGS"
  90 ZLIBDIR=`echo $zlibdir | sed 's,\$(top_builddir)/,,g'`
  91 LDFLAGS="-L../bfd -L../libiberty $ZLIBDIR $LDFLAGS"
  92 intl=`echo $LIBINTL | sed 's,${top_builddir}/,,g'`
  93 LIBS="-lbfd -liberty -lz $ZSTD_LIBS $intl $LIBS"
  94 AC_CACHE_CHECK([for ELF support in BFD], ac_cv_libctf_bfd_elf,
  95 [AC_TRY_LINK([#include <stdlib.h>
  96              #include <string.h>
  97              #include "bfd.h"
  98              #include "elf-bfd.h"],
  99             [(void) bfd_section_from_elf_index (NULL, 0);
 100              return 0;],
 101             [ac_cv_libctf_bfd_elf=yes],
 102             [ac_cv_libctf_bfd_elf=no])])
 103 CFLAGS=$OLD_CFLAGS
 104 LDFLAGS=$OLD_LDFLAGS
 105 LIBS=$OLD_LIBS
 106
 107 if test $ac_cv_libctf_bfd_elf = yes; then
 108   AC_DEFINE([HAVE_BFD_ELF], 1,
 109             [Whether libbfd was configured for an ELF target.])
 110 fi
 111
 112 AC_C_BIGENDIAN
 113 AC_CHECK_HEADERS(byteswap.h endian.h)
 114 AC_CHECK_FUNCS(pread)
 115
 116 dnl Check for bswap_{16,32,64}
 117 AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64], [], [], [[#include <byteswap.h>]])
 118 AC_CHECK_DECLS([asprintf, vasprintf, stpcpy])
 119
 120 dnl Check for qsort_r.  (Taken from gnulib.)
 121 AC_CHECK_FUNCS_ONCE([qsort_r])
 122 if test $ac_cv_func_qsort_r = yes; then
 123   AC_CACHE_CHECK([for qsort_r signature], [ac_cv_libctf_qsort_r_signature],
 124     [AC_LINK_IFELSE(
 125        [AC_LANG_PROGRAM([[#undef qsort_r
 126                           #include <stdlib.h>
 127                           void qsort_r (void *, size_t, size_t,
 128                                         int (*) (void const *, void const *,
 129                                                  void *),
 130                                         void *);
 131                           void (*p) (void *, size_t, size_t,
 132                                      int (*) (void const *, void const *,
 133                                               void *),
 134                                      void *) = qsort_r;
 135                         ]])],
 136        [ac_cv_libctf_qsort_r_signature=GNU],
 137        [AC_LINK_IFELSE(
 138           [AC_LANG_PROGRAM([[#undef qsort_r
 139                              #include <stdlib.h>
 140                              void qsort_r (void *, size_t, size_t, void *,
 141                                            int (*) (void *,
 142                                                     void const *,
 143                                                     void const *));
 144                              void (*p) (void *, size_t, size_t, void *,
 145                                         int (*) (void *, void const *,
 146                                                  void const *)) = qsort_r;
 147                            ]])],
 148           [ac_cv_libctf_qsort_r_signature=BSD],
 149           [ac_cv_libctf_qsort_r_signature=unknown])])])
 150 fi
 151
 152 case x$ac_cv_libctf_qsort_r_signature in
 153   xGNU)     AC_DEFINE([HAVE_QSORT_R_ARG_LAST], 1,
 154              [Whether a qsort_r exists with a void *arg as its last arg.]);;
 155   xBSD)     AC_DEFINE([HAVE_QSORT_R_COMPAR_LAST], 1,
 156              [Whether a qsort_r exists with the compar function as its last arg.]);;
 157   *) ac_cv_libctf_qsort_r_signature=unknown;;
 158 esac
 159
 160 AM_CONDITIONAL(NEED_CTF_QSORT_R, test "${ac_cv_libctf_qsort_r_signature}" = unknown)
 161
 162 AC_CACHE_CHECK([for O_CLOEXEC], [ac_cv_libctf_macro_O_CLOEXEC],
 163   [AC_LINK_IFELSE(
 164     [AC_LANG_PROGRAM([[#include <fcntl.h>
 165                        #ifndef O_CLOEXEC
 166                          choke me;
 167                        #endif
 168                      ]],
 169                      [[return O_CLOEXEC;]])],
 170     [ac_cv_libctf_macro_O_CLOEXEC=yes],
 171     [ac_cv_libctf_macro_O_CLOEXEC=no])])
 172
 173 if test $ac_cv_libctf_macro_O_CLOEXEC = yes; then
 174   AC_DEFINE([HAVE_O_CLOEXEC], 1,
 175             [Whether the platform has a definition of O_CLOEXEC.])
 176 fi
 177
 178 build_info=
 179 makeinfo_too_old=
 180 AC_CHECK_PROGS([MAKEINFO], makeinfo, [$MISSING makeinfo])
 181 case " $build_configdirs " in
 182   *" texinfo "*) MAKEINFO='$$r/$(BUILD_SUBDIR)/texinfo/makeinfo/makeinfo' ;;
 183 esac
 184 changequote(,)
 185     # We require texinfo to be 6.3 or later, for a working synindex
 186     # and validatemenus: otherwise we fall back to /bin/true.
 187     if ${MAKEINFO} --version \
 188        | egrep 'texinfo[^0-9]*(6\.[3-9]|[7-9][0-9])' >/dev/null 2>&1; then
 189       build_info=yes
 190     else
 191         build_info=
 192         makeinfo_too_old=t
 193     fi
 194 changequote([,])
 195 if test -n "$makeinfo_too_old"; then
 196     AC_MSG_WARN([
 197 *** Makeinfo is too old. Info documentation will not be built.])
 198 fi
 199 AC_SUBST(MAKEINFO)
 200 AM_CONDITIONAL(BUILD_INFO, test "${build_info}" = yes)
 201
 202 CTF_LIBADD="-L`pwd`/../libiberty -liberty"
 203 SHARED_LDFLAGS=
 204
 205 # Horrible hacks to build DLLs on Windows and a shared library elsewhere.
 206 if test "$enable_shared" = "yes"; then
 207 # When building a shared libctf, link against the pic version of libiberty
 208 # so that apps that use libctf won't need libiberty just to satisfy any
 209 # libctf references.  We can't do that if a pic libiberty is unavailable
 210 # since including non-pic # code would insert text relocations into libctf.
 211 # Note that linking against libbfd as we do here, which is itself linked
 212 # against libiberty, may not satisfy all the libctf libiberty references
 213 # since libbfd may not pull in the entirety of libiberty.
 214 # Also, jam libintl into the right place in all of this: after libiberty,
 215 # which uses it, but before -lcygwin, which it uses.
 216 changequote(,)dnl
 217   x=`sed -n -e 's/^[    ]*PICFLAG[      ]*=[    ]*//p' < ../libiberty/Makefile | sed -n '$p'`
 218 changequote([,])dnl
 219   if test -n "$x"; then
 220     CTF_LIBADD="-L`pwd`/../libiberty/pic -liberty"
 221   fi
 222 fi
 223
 224 CTF_LIBADD="$CTF_LIBADD $LIBINTL"
 225
 226 if test "$enable_shared" = "yes"; then
 227   case "${host}" in
 228   # More hacks to build DLLs on Windows.
 229     *-*-cygwin*)
 230       SHARED_LDFLAGS="-no-undefined"
 231       CTF_LIBADD="$CTF_LIBADD -lcygwin"
 232       ;;
 233   esac
 234 fi
 235 AC_SUBST(SHARED_LDFLAGS)
 236 AC_SUBST(CTF_LIBADD)
 237
 238 AC_PATH_PROG([EXPECT], [expect])
 239 AC_CACHE_CHECK([for Tcl supporting try/catch], [ac_cv_libctf_tcl_try],
 240   [ac_cv_libctf_tcl_try=`if test -z $EXPECT; then echo no; else $EXPECT << EOF
 241 if @<:@llength @<:@info commands try@:>@@:>@ then { puts yes } else { puts no }
 242 EOF
 243 fi`
 244 ])
 245 AM_CONDITIONAL(TCL_TRY, test "${ac_cv_libctf_tcl_try}" = yes)
 246
 247 # Use a version script, if possible, or an -export-symbols-regex otherwise.
 248 decommented_version_script=
 249 AC_CACHE_CHECK([for linker versioning flags], [ac_cv_libctf_version_script],
 250   [echo 'FOO { global: mai*; local: ctf_fo*; };' > conftest.ver
 251    old_LDFLAGS="$LDFLAGS"
 252    old_CFLAGS="$CFLAGS"
 253    LDFLAGS="$LDFLAGS -shared -Wl,--version-script=conftest.ver"
 254    CFLAGS="$CFLAGS -fPIC"
 255    AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
 256                                     int main (void) { return ctf_foo(); }]])],
 257                   [ac_cv_libctf_version_script="-Wl,--version-script='$srcdir/libctf.ver'"],
 258                   [])
 259    LDFLAGS="$old_LDFLAGS"
 260
 261    if test -z "$ac_cv_libctf_version_script"; then
 262      LDFLAGS="$LDFLAGS -shared -Wl,-B,local -Wl,-z,gnu-version-script=conftest.ver"
 263      AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
 264                                       int main (void) { return ctf_foo(); }]])],
 265                     [ac_cv_libctf_version_script="-Wl,-B,local -Wl,-z,gnu-version-script"
 266                      decommented_version_script=t],
 267                     [])
 268      LDFLAGS="$old_LDFLAGS"
 269    fi
 270    CFLAGS="$old_CFLAGS"
 271
 272    if test -z "$ac_cv_libctf_version_script"; then
 273      ac_cv_libctf_version_script='-export-symbols-regex ctf_.*'
 274    fi
 275    rm -f conftest.ver])
 276 if test -n "$decommented_version_script"; then
 277    # Solaris's version scripts use shell-style comments rather than the C-style
 278    # used by GNU ld.  Use cpp to strip the comments out.  (cpp exists under this
 279    # name on all platforms that support ld -z gnu-version-script.)
 280    # Also ensure that no symbols exist in the version script for libctf-nobfd.so
 281    # that do not exist in the shared library itself, since some linkers add such
 282    # symbols with type NOTYPE.
 283    /lib/cpp < $srcdir/libctf.ver > libctf-decommented.ver
 284    grep -v 'libctf only' $srcdir/libctf.ver | /lib/cpp > libctf-nobfd-decommented.ver
 285    VERSION_FLAGS="$ac_cv_libctf_version_script='libctf-decommented.ver'"
 286    VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script='libctf-nobfd-decommented.ver'"
 287 else
 288    VERSION_FLAGS="$ac_cv_libctf_version_script"
 289    VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script"
 290 fi
 291 AC_SUBST(VERSION_FLAGS)
 292 AC_SUBST(VERSION_FLAGS_NOBFD)
 293
 294 AC_CONFIG_FILES(Makefile)
 295 AC_CONFIG_HEADERS(config.h)
 296 AC_OUTPUT
 297
 298 GNU_MAKE_JOBSERVER