| 1 | # lib-prefix.m4 serial 19
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| 2 | dnl Copyright (C) 2001-2005, 2008-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Bruno Haible.
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| 8 |
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| 9 | dnl AC_LIB_PREFIX adds to the CPPFLAGS and LDFLAGS the flags that are needed
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| 10 | dnl to access previously installed libraries. The basic assumption is that
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| 11 | dnl a user will want packages to use other packages he previously installed
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| 12 | dnl with the same --prefix option.
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| 13 | dnl This macro is not needed if only AC_LIB_LINKFLAGS is used to locate
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| 14 | dnl libraries, but is otherwise very convenient.
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| 15 | AC_DEFUN([AC_LIB_PREFIX],
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| 16 | [
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| 17 | AC_BEFORE([$0], [AC_LIB_LINKFLAGS])
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| 18 | AC_REQUIRE([AC_PROG_CC])
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| 19 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 20 | AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
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| 21 | AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
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| 22 | dnl By default, look in $includedir and $libdir.
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| 23 | use_additional=yes
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| 24 | AC_LIB_WITH_FINAL_PREFIX([
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| 25 | eval additional_includedir=\"$includedir\"
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| 26 | eval additional_libdir=\"$libdir\"
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| 27 | ])
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| 28 | AC_ARG_WITH([lib-prefix],
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| 29 | [[ --with-lib-prefix[=DIR] search for libraries in DIR/include and DIR/lib
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| 30 | --without-lib-prefix don't search for libraries in includedir and libdir]],
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| 31 | [
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| 32 | if test "X$withval" = "Xno"; then
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| 33 | use_additional=no
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| 34 | else
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| 35 | if test "X$withval" = "X"; then
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| 36 | AC_LIB_WITH_FINAL_PREFIX([
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| 37 | eval additional_includedir=\"$includedir\"
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| 38 | eval additional_libdir=\"$libdir\"
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| 39 | ])
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| 40 | else
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| 41 | additional_includedir="$withval/include"
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| 42 | additional_libdir="$withval/$acl_libdirstem"
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| 43 | fi
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| 44 | fi
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| 45 | ])
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| 46 | if test $use_additional = yes; then
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| 47 | dnl Potentially add $additional_includedir to $CPPFLAGS.
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| 48 | dnl But don't add it
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| 49 | dnl 1. if it's the standard /usr/include,
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| 50 | dnl 2. if it's already present in $CPPFLAGS,
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| 51 | dnl 3. if it's /usr/local/include and we are using GCC on Linux,
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| 52 | dnl 4. if it doesn't exist as a directory.
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| 53 | if test "X$additional_includedir" != "X/usr/include"; then
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| 54 | haveit=
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| 55 | for x in $CPPFLAGS; do
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| 56 | AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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| 57 | if test "X$x" = "X-I$additional_includedir"; then
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| 58 | haveit=yes
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| 59 | break
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| 60 | fi
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| 61 | done
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| 62 | if test -z "$haveit"; then
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| 63 | if test "X$additional_includedir" = "X/usr/local/include"; then
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| 64 | if test -n "$GCC"; then
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| 65 | case $host_os in
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| 66 | linux* | gnu* | k*bsd*-gnu) haveit=yes;;
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| 67 | esac
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| 68 | fi
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| 69 | fi
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| 70 | if test -z "$haveit"; then
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| 71 | if test -d "$additional_includedir"; then
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| 72 | dnl Really add $additional_includedir to $CPPFLAGS.
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| 73 | CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir"
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| 74 | fi
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| 75 | fi
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| 76 | fi
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| 77 | fi
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| 78 | dnl Potentially add $additional_libdir to $LDFLAGS.
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| 79 | dnl But don't add it
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| 80 | dnl 1. if it's the standard /usr/lib,
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| 81 | dnl 2. if it's already present in $LDFLAGS,
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| 82 | dnl 3. if it's /usr/local/lib and we are using GCC on Linux,
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| 83 | dnl 4. if it doesn't exist as a directory.
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| 84 | if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then
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| 85 | haveit=
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| 86 | for x in $LDFLAGS; do
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| 87 | AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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| 88 | if test "X$x" = "X-L$additional_libdir"; then
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| 89 | haveit=yes
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| 90 | break
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| 91 | fi
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| 92 | done
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| 93 | if test -z "$haveit"; then
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| 94 | if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then
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| 95 | if test -n "$GCC"; then
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| 96 | case $host_os in
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| 97 | linux*) haveit=yes;;
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| 98 | esac
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| 99 | fi
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| 100 | fi
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| 101 | if test -z "$haveit"; then
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| 102 | if test -d "$additional_libdir"; then
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| 103 | dnl Really add $additional_libdir to $LDFLAGS.
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| 104 | LDFLAGS="${LDFLAGS}${LDFLAGS:+ }-L$additional_libdir"
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| 105 | fi
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| 106 | fi
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| 107 | fi
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| 108 | fi
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| 109 | fi
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| 110 | ])
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| 111 |
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| 112 | dnl AC_LIB_PREPARE_PREFIX creates variables acl_final_prefix,
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| 113 | dnl acl_final_exec_prefix, containing the values to which $prefix and
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| 114 | dnl $exec_prefix will expand at the end of the configure script.
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| 115 | AC_DEFUN([AC_LIB_PREPARE_PREFIX],
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| 116 | [
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| 117 | dnl Unfortunately, prefix and exec_prefix get only finally determined
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| 118 | dnl at the end of configure.
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| 119 | if test "X$prefix" = "XNONE"; then
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| 120 | acl_final_prefix="$ac_default_prefix"
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| 121 | else
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| 122 | acl_final_prefix="$prefix"
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| 123 | fi
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| 124 | if test "X$exec_prefix" = "XNONE"; then
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| 125 | acl_final_exec_prefix='${prefix}'
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| 126 | else
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| 127 | acl_final_exec_prefix="$exec_prefix"
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| 128 | fi
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| 129 | acl_save_prefix="$prefix"
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| 130 | prefix="$acl_final_prefix"
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| 131 | eval acl_final_exec_prefix=\"$acl_final_exec_prefix\"
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| 132 | prefix="$acl_save_prefix"
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| 133 | ])
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| 134 |
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| 135 | dnl AC_LIB_WITH_FINAL_PREFIX([statement]) evaluates statement, with the
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| 136 | dnl variables prefix and exec_prefix bound to the values they will have
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| 137 | dnl at the end of the configure script.
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| 138 | AC_DEFUN([AC_LIB_WITH_FINAL_PREFIX],
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| 139 | [
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| 140 | acl_save_prefix="$prefix"
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| 141 | prefix="$acl_final_prefix"
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| 142 | acl_save_exec_prefix="$exec_prefix"
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| 143 | exec_prefix="$acl_final_exec_prefix"
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| 144 | $1
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| 145 | exec_prefix="$acl_save_exec_prefix"
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| 146 | prefix="$acl_save_prefix"
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| 147 | ])
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| 148 |
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| 149 | dnl AC_LIB_PREPARE_MULTILIB creates
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| 150 | dnl - a function acl_is_expected_elfclass, that tests whether standard input
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| 151 | dn; has a 32-bit or 64-bit ELF header, depending on the host CPU ABI,
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| 152 | dnl - 3 variables acl_libdirstem, acl_libdirstem2, acl_libdirstem3, containing
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| 153 | dnl the basename of the libdir to try in turn, either "lib" or "lib64" or
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| 154 | dnl "lib/64" or "lib32" or "lib/sparcv9" or "lib/amd64" or similar.
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| 155 | AC_DEFUN([AC_LIB_PREPARE_MULTILIB],
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| 156 | [
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| 157 | dnl There is no formal standard regarding lib, lib32, and lib64.
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| 158 | dnl On most glibc systems, the current practice is that on a system supporting
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| 159 | dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
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| 160 | dnl $prefix/lib64 and 32-bit libraries go under $prefix/lib. However, on
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| 161 | dnl Arch Linux based distributions, it's the opposite: 32-bit libraries go
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| 162 | dnl under $prefix/lib32 and 64-bit libraries go under $prefix/lib.
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| 163 | dnl We determine the compiler's default mode by looking at the compiler's
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| 164 | dnl library search path. If at least one of its elements ends in /lib64 or
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| 165 | dnl points to a directory whose absolute pathname ends in /lib64, we use that
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| 166 | dnl for 64-bit ABIs. Similarly for 32-bit ABIs. Otherwise we use the default,
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| 167 | dnl namely "lib".
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| 168 | dnl On Solaris systems, the current practice is that on a system supporting
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| 169 | dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
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| 170 | dnl $prefix/lib/64 (which is a symlink to either $prefix/lib/sparcv9 or
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| 171 | dnl $prefix/lib/amd64) and 32-bit libraries go under $prefix/lib.
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| 172 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 173 | AC_REQUIRE([gl_HOST_CPU_C_ABI_32BIT])
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| 174 |
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| 175 | AC_CACHE_CHECK([for ELF binary format], [gl_cv_elf],
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| 176 | [AC_EGREP_CPP([Extensible Linking Format],
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| 177 | [#ifdef __ELF__
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| 178 | Extensible Linking Format
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| 179 | #endif
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| 180 | ],
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| 181 | [gl_cv_elf=yes],
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| 182 | [gl_cv_elf=no])
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| 183 | ])
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| 184 | if test $gl_cv_elf = yes; then
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| 185 | # Extract the ELF class of a file (5th byte) in decimal.
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| 186 | # Cf. https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
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| 187 | if od -A x < /dev/null >/dev/null 2>/dev/null; then
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| 188 | # Use POSIX od.
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| 189 | func_elfclass ()
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| 190 | {
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| 191 | od -A n -t d1 -j 4 -N 1
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| 192 | }
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| 193 | else
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| 194 | # Use BSD hexdump.
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| 195 | func_elfclass ()
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| 196 | {
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| 197 | dd bs=1 count=1 skip=4 2>/dev/null | hexdump -e '1/1 "%3d "'
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| 198 | echo
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| 199 | }
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| 200 | fi
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| 201 | # Use 'expr', not 'test', to compare the values of func_elfclass, because on
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| 202 | # Solaris 11 OpenIndiana and Solaris 11 OmniOS, the result is 001 or 002,
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| 203 | # not 1 or 2.
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| 204 | changequote(,)dnl
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| 205 | case $HOST_CPU_C_ABI_32BIT in
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| 206 | yes)
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| 207 | # 32-bit ABI.
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| 208 | acl_is_expected_elfclass ()
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| 209 | {
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| 210 | expr "`func_elfclass | sed -e 's/[ ]//g'`" = 1 > /dev/null
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| 211 | }
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| 212 | ;;
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| 213 | no)
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| 214 | # 64-bit ABI.
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| 215 | acl_is_expected_elfclass ()
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| 216 | {
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| 217 | expr "`func_elfclass | sed -e 's/[ ]//g'`" = 2 > /dev/null
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| 218 | }
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| 219 | ;;
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| 220 | *)
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| 221 | # Unknown.
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| 222 | acl_is_expected_elfclass ()
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| 223 | {
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| 224 | :
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| 225 | }
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| 226 | ;;
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| 227 | esac
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| 228 | changequote([,])dnl
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| 229 | else
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| 230 | acl_is_expected_elfclass ()
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| 231 | {
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| 232 | :
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| 233 | }
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| 234 | fi
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| 235 |
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| 236 | dnl Allow the user to override the result by setting acl_cv_libdirstems.
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| 237 | AC_CACHE_CHECK([for the common suffixes of directories in the library search path],
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| 238 | [acl_cv_libdirstems],
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| 239 | [dnl Try 'lib' first, because that's the default for libdir in GNU, see
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| 240 | dnl <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html>.
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| 241 | acl_libdirstem=lib
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| 242 | acl_libdirstem2=
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| 243 | acl_libdirstem3=
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| 244 | case "$host_os" in
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| 245 | solaris*)
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| 246 | dnl See Solaris 10 Software Developer Collection > Solaris 64-bit Developer's Guide > The Development Environment
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| 247 | dnl <https://docs.oracle.com/cd/E19253-01/816-5138/dev-env/index.html>.
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| 248 | dnl "Portable Makefiles should refer to any library directories using the 64 symbolic link."
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| 249 | dnl But we want to recognize the sparcv9 or amd64 subdirectory also if the
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| 250 | dnl symlink is missing, so we set acl_libdirstem2 too.
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| 251 | if test $HOST_CPU_C_ABI_32BIT = no; then
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| 252 | acl_libdirstem2=lib/64
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| 253 | case "$host_cpu" in
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| 254 | sparc*) acl_libdirstem3=lib/sparcv9 ;;
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| 255 | i*86 | x86_64) acl_libdirstem3=lib/amd64 ;;
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| 256 | esac
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| 257 | fi
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| 258 | ;;
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| 259 | *)
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| 260 | dnl If $CC generates code for a 32-bit ABI, the libraries are
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| 261 | dnl surely under $prefix/lib or $prefix/lib32, not $prefix/lib64.
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| 262 | dnl Similarly, if $CC generates code for a 64-bit ABI, the libraries
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| 263 | dnl are surely under $prefix/lib or $prefix/lib64, not $prefix/lib32.
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| 264 | dnl Find the compiler's search path. However, non-system compilers
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| 265 | dnl sometimes have odd library search paths. But we can't simply invoke
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| 266 | dnl '/usr/bin/gcc -print-search-dirs' because that would not take into
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| 267 | dnl account the -m32/-m31 or -m64 options from the $CC or $CFLAGS.
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| 268 | searchpath=`(LC_ALL=C $CC $CPPFLAGS $CFLAGS -print-search-dirs) 2>/dev/null \
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| 269 | | sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'`
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| 270 | if test $HOST_CPU_C_ABI_32BIT != no; then
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| 271 | # 32-bit or unknown ABI.
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| 272 | if test -d /usr/lib32; then
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| 273 | acl_libdirstem2=lib32
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| 274 | fi
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| 275 | fi
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| 276 | if test $HOST_CPU_C_ABI_32BIT != yes; then
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| 277 | # 64-bit or unknown ABI.
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| 278 | if test -d /usr/lib64; then
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| 279 | acl_libdirstem3=lib64
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| 280 | fi
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| 281 | fi
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| 282 | if test -n "$searchpath"; then
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| 283 | acl_save_IFS="${IFS= }"; IFS=":"
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| 284 | for searchdir in $searchpath; do
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| 285 | if test -d "$searchdir"; then
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| 286 | case "$searchdir" in
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| 287 | */lib32/ | */lib32 ) acl_libdirstem2=lib32 ;;
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| 288 | */lib64/ | */lib64 ) acl_libdirstem3=lib64 ;;
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| 289 | */../ | */.. )
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| 290 | # Better ignore directories of this form. They are misleading.
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| 291 | ;;
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| 292 | *) searchdir=`cd "$searchdir" && pwd`
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| 293 | case "$searchdir" in
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| 294 | */lib32 ) acl_libdirstem2=lib32 ;;
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| 295 | */lib64 ) acl_libdirstem3=lib64 ;;
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| 296 | esac ;;
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| 297 | esac
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| 298 | fi
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| 299 | done
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| 300 | IFS="$acl_save_IFS"
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| 301 | if test $HOST_CPU_C_ABI_32BIT = yes; then
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| 302 | # 32-bit ABI.
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| 303 | acl_libdirstem3=
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| 304 | fi
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| 305 | if test $HOST_CPU_C_ABI_32BIT = no; then
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| 306 | # 64-bit ABI.
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| 307 | acl_libdirstem2=
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| 308 | fi
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| 309 | fi
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| 310 | ;;
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| 311 | esac
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| 312 | test -n "$acl_libdirstem2" || acl_libdirstem2="$acl_libdirstem"
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| 313 | test -n "$acl_libdirstem3" || acl_libdirstem3="$acl_libdirstem"
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| 314 | acl_cv_libdirstems="$acl_libdirstem,$acl_libdirstem2,$acl_libdirstem3"
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| 315 | ])
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| 316 | dnl Decompose acl_cv_libdirstems into acl_libdirstem, acl_libdirstem2, and
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| 317 | dnl acl_libdirstem3.
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| 318 | changequote(,)dnl
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| 319 | acl_libdirstem=`echo "$acl_cv_libdirstems" | sed -e 's/,.*//'`
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| 320 | acl_libdirstem2=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,//' -e 's/,.*//'`
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| 321 | acl_libdirstem3=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,[^,]*,//' -e 's/,.*//'`
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| 322 | changequote([,])dnl
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| 323 | ])
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