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