config/lib-prefix.m4

   1 # lib-prefix.m4 serial 14
   2 dnl Copyright (C) 2001-2005, 2008-2019 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Bruno Haible.
   8
   9 dnl AC_LIB_PREFIX adds to the CPPFLAGS and LDFLAGS the flags that are needed
  10 dnl to access previously installed libraries. The basic assumption is that
  11 dnl packages should use other packages that are installed with the same
  12 dnl --prefix option.  This macro is not needed if only AC_LIB_LINKFLAGS is
  13 dnl used to locate libraries, but is otherwise very convenient.
  14 AC_DEFUN([AC_LIB_PREFIX],
  15 [
  16   AC_BEFORE([$0], [AC_LIB_LINKFLAGS])
  17   AC_REQUIRE([AC_PROG_CC])
  18   AC_REQUIRE([AC_CANONICAL_HOST])
  19   AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
  20   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  21   dnl By default, look in $includedir and $libdir.
  22   use_additional=yes
  23   AC_LIB_WITH_FINAL_PREFIX([
  24     eval additional_includedir=\"$includedir\"
  25     eval additional_libdir=\"$libdir\"
  26   ])
  27   AC_ARG_WITH([lib-prefix],
  28 [[  --with-lib-prefix[=DIR] search for libraries in DIR/include and DIR/lib
  29   --without-lib-prefix    don't search for libraries in includedir and libdir]],
  30 [
  31     if test "X$withval" = "Xno"; then
  32       use_additional=no
  33     else
  34       if test "X$withval" = "X"; then
  35         AC_LIB_WITH_FINAL_PREFIX([
  36           eval additional_includedir=\"$includedir\"
  37           eval additional_libdir=\"$libdir\"
  38         ])
  39       else
  40         additional_includedir="$withval/include"
  41         additional_libdir="$withval/$acl_libdirstem"
  42       fi
  43     fi
  44 ])
  45   if test $use_additional = yes; then
  46     dnl Potentially add $additional_includedir to $CPPFLAGS.
  47     dnl But don't add it
  48     dnl   1. if it's the standard /usr/include,
  49     dnl   2. if it's already present in $CPPFLAGS,
  50     dnl   3. if it's /usr/local/include and we are using GCC on Linux,
  51     dnl   4. if it doesn't exist as a directory.
  52     if test "X$additional_includedir" != "X/usr/include"; then
  53       haveit=
  54       for x in $CPPFLAGS; do
  55         AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
  56         if test "X$x" = "X-I$additional_includedir"; then
  57           haveit=yes
  58           break
  59         fi
  60       done
  61       if test -z "$haveit"; then
  62         if test "X$additional_includedir" = "X/usr/local/include"; then
  63           if test -n "$GCC"; then
  64             case $host_os in
  65               linux* | gnu* | k*bsd*-gnu) haveit=yes;;
  66             esac
  67           fi
  68         fi
  69         if test -z "$haveit"; then
  70           if test -d "$additional_includedir"; then
  71             dnl Really add $additional_includedir to $CPPFLAGS.
  72             CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir"
  73           fi
  74         fi
  75       fi
  76     fi
  77     dnl Potentially add $additional_libdir to $LDFLAGS.
  78     dnl But don't add it
  79     dnl   1. if it's the standard /usr/lib,
  80     dnl   2. if it's already present in $LDFLAGS,
  81     dnl   3. if it's /usr/local/lib and we are using GCC on Linux,
  82     dnl   4. if it doesn't exist as a directory.
  83     if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then
  84       haveit=
  85       for x in $LDFLAGS; do
  86         AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
  87         if test "X$x" = "X-L$additional_libdir"; then
  88           haveit=yes
  89           break
  90         fi
  91       done
  92       if test -z "$haveit"; then
  93         if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then
  94           if test -n "$GCC"; then
  95             case $host_os in
  96               linux*) haveit=yes;;
  97             esac
  98           fi
  99         fi
 100         if test -z "$haveit"; then
 101           if test -d "$additional_libdir"; then
 102             dnl Really add $additional_libdir to $LDFLAGS.
 103             LDFLAGS="${LDFLAGS}${LDFLAGS:+ }-L$additional_libdir"
 104           fi
 105         fi
 106       fi
 107     fi
 108   fi
 109 ])
 110
 111 dnl AC_LIB_PREPARE_PREFIX creates variables acl_final_prefix,
 112 dnl acl_final_exec_prefix, containing the values to which $prefix and
 113 dnl $exec_prefix will expand at the end of the configure script.
 114 AC_DEFUN([AC_LIB_PREPARE_PREFIX],
 115 [
 116   dnl Unfortunately, prefix and exec_prefix get only finally determined
 117   dnl at the end of configure.
 118   if test "X$prefix" = "XNONE"; then
 119     acl_final_prefix="$ac_default_prefix"
 120   else
 121     acl_final_prefix="$prefix"
 122   fi
 123   if test "X$exec_prefix" = "XNONE"; then
 124     acl_final_exec_prefix='${prefix}'
 125   else
 126     acl_final_exec_prefix="$exec_prefix"
 127   fi
 128   acl_save_prefix="$prefix"
 129   prefix="$acl_final_prefix"
 130   eval acl_final_exec_prefix=\"$acl_final_exec_prefix\"
 131   prefix="$acl_save_prefix"
 132 ])
 133
 134 dnl AC_LIB_WITH_FINAL_PREFIX([statement]) evaluates statement, with the
 135 dnl variables prefix and exec_prefix bound to the values they will have
 136 dnl at the end of the configure script.
 137 AC_DEFUN([AC_LIB_WITH_FINAL_PREFIX],
 138 [
 139   acl_save_prefix="$prefix"
 140   prefix="$acl_final_prefix"
 141   acl_save_exec_prefix="$exec_prefix"
 142   exec_prefix="$acl_final_exec_prefix"
 143   $1
 144   exec_prefix="$acl_save_exec_prefix"
 145   prefix="$acl_save_prefix"
 146 ])
 147
 148 dnl AC_LIB_PREPARE_MULTILIB creates
 149 dnl - a variable acl_libdirstem, containing the basename of the libdir, either
 150 dnl   "lib" or "lib64" or "lib/64",
 151 dnl - a variable acl_libdirstem2, as a secondary possible value for
 152 dnl   acl_libdirstem, either the same as acl_libdirstem or "lib/sparcv9" or
 153 dnl   "lib/amd64".
 154 AC_DEFUN([AC_LIB_PREPARE_MULTILIB],
 155 [
 156   dnl There is no formal standard regarding lib and lib64.
 157   dnl On glibc systems, the current practice is that on a system supporting
 158   dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
 159   dnl $prefix/lib64 and 32-bit libraries go under $prefix/lib. We determine
 160   dnl the compiler's default mode by looking at the compiler's library search
 161   dnl path. If at least one of its elements ends in /lib64 or points to a
 162   dnl directory whose absolute pathname ends in /lib64, we assume a 64-bit ABI.
 163   dnl Otherwise we use the default, namely "lib".
 164   dnl On Solaris systems, the current practice is that on a system supporting
 165   dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
 166   dnl $prefix/lib/64 (which is a symlink to either $prefix/lib/sparcv9 or
 167   dnl $prefix/lib/amd64) and 32-bit libraries go under $prefix/lib.
 168   AC_REQUIRE([AC_CANONICAL_HOST])
 169   AC_REQUIRE([gl_HOST_CPU_C_ABI_32BIT])
 170
 171   case "$host_os" in
 172     solaris*)
 173       AC_CACHE_CHECK([for 64-bit host], [gl_cv_solaris_64bit],
 174         [AC_COMPILE_IFELSE(
 175            [AC_LANG_SOURCE(
 176               [[#ifdef _LP64
 177                  int ok;
 178                 #else
 179                  error fail
 180                 #endif
 181               ]])],
 182            [gl_cv_solaris_64bit=yes],
 183            [gl_cv_solaris_64bit=no])
 184         ]);;
 185   esac
 186
 187   dnl Allow the user to override the result by setting acl_cv_libdirstems.
 188   AC_CACHE_CHECK([for the common suffixes of directories in the library search path],
 189     [acl_cv_libdirstems],
 190     [acl_libdirstem=lib
 191      acl_libdirstem2=
 192      case "$host_os" in
 193        solaris*)
 194          dnl See Solaris 10 Software Developer Collection > Solaris 64-bit Developer's Guide > The Development Environment
 195          dnl <https://docs.oracle.com/cd/E19253-01/816-5138/dev-env/index.html>.
 196          dnl "Portable Makefiles should refer to any library directories using the 64 symbolic link."
 197          dnl But we want to recognize the sparcv9 or amd64 subdirectory also if the
 198          dnl symlink is missing, so we set acl_libdirstem2 too.
 199          if test $gl_cv_solaris_64bit = yes; then
 200            acl_libdirstem=lib/64
 201            case "$host_cpu" in
 202              sparc*)        acl_libdirstem2=lib/sparcv9 ;;
 203              i*86 | x86_64) acl_libdirstem2=lib/amd64 ;;
 204            esac
 205          fi
 206          ;;
 207        *)
 208          dnl If $CC generates code for a 32-bit ABI, the libraries are
 209          dnl surely under $prefix/lib, not $prefix/lib64.
 210          if test "$HOST_CPU_C_ABI_32BIT" != yes; then
 211            dnl The result is a property of the system. However, non-system
 212            dnl compilers sometimes have odd library search paths. Therefore
 213            dnl prefer asking /usr/bin/gcc, if available, rather than $CC.
 214            searchpath=`(if test -f /usr/bin/gcc \
 215                            && LC_ALL=C /usr/bin/gcc -print-search-dirs >/dev/null 2>/dev/null; then \
 216                           LC_ALL=C /usr/bin/gcc -print-search-dirs; \
 217                         else \
 218                           LC_ALL=C $CC -print-search-dirs; \
 219                         fi) 2>/dev/null \
 220                        | sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'`
 221            if test -n "$searchpath"; then
 222              acl_save_IFS="${IFS=       }"; IFS=":"
 223              for searchdir in $searchpath; do
 224                if test -d "$searchdir"; then
 225                  case "$searchdir" in
 226                    */lib64/ | */lib64 ) acl_libdirstem=lib64 ;;
 227                    */../ | */.. )
 228                      # Better ignore directories of this form. They are misleading.
 229                      ;;
 230                    *) searchdir=`cd "$searchdir" && pwd`
 231                       case "$searchdir" in
 232                         */lib64 ) acl_libdirstem=lib64 ;;
 233                       esac ;;
 234                  esac
 235                fi
 236              done
 237              IFS="$acl_save_IFS"
 238            fi
 239          fi
 240          ;;
 241      esac
 242      test -n "$acl_libdirstem2" || acl_libdirstem2="$acl_libdirstem"
 243      acl_cv_libdirstems="$acl_libdirstem,$acl_libdirstem2"
 244     ])
 245   # Decompose acl_cv_libdirstems into acl_libdirstem and acl_libdirstem2.
 246   acl_libdirstem=`echo "$acl_cv_libdirstems" | sed -e 's/,.*//'`
 247   acl_libdirstem2=`echo "$acl_cv_libdirstems" | sed -e '/,/s/.*,//'`
 248 ])