321 lines
12 KiB
Text
321 lines
12 KiB
Text
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# lib-prefix.m4 serial 17
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dnl Copyright (C) 2001-2005, 2008-2020 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Bruno Haible.
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dnl AC_LIB_PREFIX adds to the CPPFLAGS and LDFLAGS the flags that are needed
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dnl to access previously installed libraries. The basic assumption is that
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dnl a user will want packages to use other packages he previously installed
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dnl with the same --prefix option.
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dnl This macro is not needed if only AC_LIB_LINKFLAGS is used to locate
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dnl libraries, but is otherwise very convenient.
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AC_DEFUN([AC_LIB_PREFIX],
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[
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AC_BEFORE([$0], [AC_LIB_LINKFLAGS])
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_REQUIRE([AC_LIB_PREPARE_MULTILIB])
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AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
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dnl By default, look in $includedir and $libdir.
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use_additional=yes
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AC_LIB_WITH_FINAL_PREFIX([
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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])
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AC_ARG_WITH([lib-prefix],
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[[ --with-lib-prefix[=DIR] search for libraries in DIR/include and DIR/lib
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--without-lib-prefix don't search for libraries in includedir and libdir]],
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[
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if test "X$withval" = "Xno"; then
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use_additional=no
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else
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if test "X$withval" = "X"; then
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AC_LIB_WITH_FINAL_PREFIX([
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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])
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else
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additional_includedir="$withval/include"
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additional_libdir="$withval/$acl_libdirstem"
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fi
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fi
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])
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if test $use_additional = yes; then
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dnl Potentially add $additional_includedir to $CPPFLAGS.
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dnl But don't add it
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dnl 1. if it's the standard /usr/include,
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dnl 2. if it's already present in $CPPFLAGS,
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dnl 3. if it's /usr/local/include and we are using GCC on Linux,
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dnl 4. if it doesn't exist as a directory.
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if test "X$additional_includedir" != "X/usr/include"; then
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haveit=
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for x in $CPPFLAGS; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-I$additional_includedir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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if test "X$additional_includedir" = "X/usr/local/include"; then
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if test -n "$GCC"; then
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case $host_os in
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linux* | gnu* | k*bsd*-gnu) haveit=yes;;
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esac
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fi
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fi
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if test -z "$haveit"; then
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if test -d "$additional_includedir"; then
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dnl Really add $additional_includedir to $CPPFLAGS.
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CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir"
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fi
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fi
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fi
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fi
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dnl Potentially add $additional_libdir to $LDFLAGS.
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dnl But don't add it
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dnl 1. if it's the standard /usr/lib,
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dnl 2. if it's already present in $LDFLAGS,
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dnl 3. if it's /usr/local/lib and we are using GCC on Linux,
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dnl 4. if it doesn't exist as a directory.
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if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then
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haveit=
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for x in $LDFLAGS; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-L$additional_libdir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then
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if test -n "$GCC"; then
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case $host_os in
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linux*) haveit=yes;;
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esac
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fi
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fi
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if test -z "$haveit"; then
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if test -d "$additional_libdir"; then
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dnl Really add $additional_libdir to $LDFLAGS.
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LDFLAGS="${LDFLAGS}${LDFLAGS:+ }-L$additional_libdir"
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fi
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fi
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fi
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fi
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fi
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])
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dnl AC_LIB_PREPARE_PREFIX creates variables acl_final_prefix,
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dnl acl_final_exec_prefix, containing the values to which $prefix and
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dnl $exec_prefix will expand at the end of the configure script.
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AC_DEFUN([AC_LIB_PREPARE_PREFIX],
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[
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dnl Unfortunately, prefix and exec_prefix get only finally determined
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dnl at the end of configure.
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if test "X$prefix" = "XNONE"; then
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acl_final_prefix="$ac_default_prefix"
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else
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acl_final_prefix="$prefix"
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fi
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if test "X$exec_prefix" = "XNONE"; then
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acl_final_exec_prefix='${prefix}'
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else
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acl_final_exec_prefix="$exec_prefix"
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fi
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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eval acl_final_exec_prefix=\"$acl_final_exec_prefix\"
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prefix="$acl_save_prefix"
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])
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dnl AC_LIB_WITH_FINAL_PREFIX([statement]) evaluates statement, with the
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dnl variables prefix and exec_prefix bound to the values they will have
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dnl at the end of the configure script.
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AC_DEFUN([AC_LIB_WITH_FINAL_PREFIX],
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[
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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$1
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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])
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dnl AC_LIB_PREPARE_MULTILIB creates
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dnl - a function acl_is_expected_elfclass, that tests whether standard input
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dn; has a 32-bit or 64-bit ELF header, depending on the host CPU ABI,
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dnl - 3 variables acl_libdirstem, acl_libdirstem2, acl_libdirstem3, containing
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dnl the basename of the libdir to try in turn, either "lib" or "lib64" or
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dnl "lib/64" or "lib32" or "lib/sparcv9" or "lib/amd64" or similar.
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AC_DEFUN([AC_LIB_PREPARE_MULTILIB],
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[
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dnl There is no formal standard regarding lib, lib32, and lib64.
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dnl On most glibc systems, the current practice is that on a system supporting
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dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
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dnl $prefix/lib64 and 32-bit libraries go under $prefix/lib. However, on
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dnl Arch Linux based distributions, it's the opposite: 32-bit libraries go
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dnl under $prefix/lib32 and 64-bit libraries go under $prefix/lib.
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dnl We determine the compiler's default mode by looking at the compiler's
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dnl library search path. If at least one of its elements ends in /lib64 or
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dnl points to a directory whose absolute pathname ends in /lib64, we use that
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dnl for 64-bit ABIs. Similarly for 32-bit ABIs. Otherwise we use the default,
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dnl namely "lib".
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dnl On Solaris systems, the current practice is that on a system supporting
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dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under
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dnl $prefix/lib/64 (which is a symlink to either $prefix/lib/sparcv9 or
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dnl $prefix/lib/amd64) and 32-bit libraries go under $prefix/lib.
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_REQUIRE([gl_HOST_CPU_C_ABI_32BIT])
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AC_CACHE_CHECK([for ELF binary format], [gl_cv_elf],
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[AC_EGREP_CPP([Extensible Linking Format],
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[#ifdef __ELF__
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Extensible Linking Format
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#endif
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],
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[gl_cv_elf=yes],
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[gl_cv_elf=no])
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])
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if test $gl_cv_elf; then
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# Extract the ELF class of a file (5th byte) in decimal.
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# Cf. https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
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if od -A x < /dev/null >/dev/null 2>/dev/null; then
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# Use POSIX od.
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func_elfclass ()
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{
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od -A n -t d1 -j 4 -N 1
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}
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else
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# Use BSD hexdump.
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func_elfclass ()
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{
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dd bs=1 count=1 skip=4 2>/dev/null | hexdump -e '1/1 "%3d "'
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echo
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}
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fi
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changequote(,)dnl
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case $HOST_CPU_C_ABI_32BIT in
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yes)
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# 32-bit ABI.
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acl_is_expected_elfclass ()
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{
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test "`func_elfclass | sed -e 's/[ ]//g'`" = 1
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}
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;;
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no)
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# 64-bit ABI.
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acl_is_expected_elfclass ()
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{
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test "`func_elfclass | sed -e 's/[ ]//g'`" = 2
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}
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;;
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*)
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# Unknown.
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acl_is_expected_elfclass ()
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{
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:
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}
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;;
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esac
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changequote([,])dnl
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else
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acl_is_expected_elfclass ()
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{
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:
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}
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fi
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dnl Allow the user to override the result by setting acl_cv_libdirstems.
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AC_CACHE_CHECK([for the common suffixes of directories in the library search path],
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[acl_cv_libdirstems],
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[dnl Try 'lib' first, because that's the default for libdir in GNU, see
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dnl <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html>.
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acl_libdirstem=lib
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acl_libdirstem2=
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acl_libdirstem3=
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case "$host_os" in
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solaris*)
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dnl See Solaris 10 Software Developer Collection > Solaris 64-bit Developer's Guide > The Development Environment
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dnl <https://docs.oracle.com/cd/E19253-01/816-5138/dev-env/index.html>.
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dnl "Portable Makefiles should refer to any library directories using the 64 symbolic link."
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dnl But we want to recognize the sparcv9 or amd64 subdirectory also if the
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dnl symlink is missing, so we set acl_libdirstem2 too.
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if test $HOST_CPU_C_ABI_32BIT = no; then
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acl_libdirstem2=lib/64
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case "$host_cpu" in
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sparc*) acl_libdirstem3=lib/sparcv9 ;;
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i*86 | x86_64) acl_libdirstem3=lib/amd64 ;;
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esac
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fi
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;;
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*)
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dnl If $CC generates code for a 32-bit ABI, the libraries are
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dnl surely under $prefix/lib or $prefix/lib32, not $prefix/lib64.
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dnl Similarly, if $CC generates code for a 64-bit ABI, the libraries
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dnl are surely under $prefix/lib or $prefix/lib64, not $prefix/lib32.
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dnl Find the compiler's search path. However, non-system compilers
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dnl sometimes have odd library search paths. But we can't simply invoke
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dnl '/usr/bin/gcc -print-search-dirs' because that would not take into
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dnl account the -m32/-m31 or -m64 options from the $CC or $CFLAGS.
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searchpath=`(LC_ALL=C $CC $CPPFLAGS $CFLAGS -print-search-dirs) 2>/dev/null \
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| sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'`
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if test $HOST_CPU_C_ABI_32BIT != no; then
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# 32-bit or unknown ABI.
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if test -d /usr/lib32; then
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acl_libdirstem2=lib32
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fi
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fi
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if test $HOST_CPU_C_ABI_32BIT != yes; then
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# 64-bit or unknown ABI.
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if test -d /usr/lib64; then
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acl_libdirstem3=lib64
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fi
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fi
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if test -n "$searchpath"; then
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acl_save_IFS="${IFS= }"; IFS=":"
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for searchdir in $searchpath; do
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if test -d "$searchdir"; then
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case "$searchdir" in
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*/lib32/ | */lib32 ) acl_libdirstem2=lib32 ;;
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*/lib64/ | */lib64 ) acl_libdirstem3=lib64 ;;
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*/../ | */.. )
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# Better ignore directories of this form. They are misleading.
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;;
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*) searchdir=`cd "$searchdir" && pwd`
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case "$searchdir" in
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*/lib32 ) acl_libdirstem2=lib32 ;;
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*/lib64 ) acl_libdirstem3=lib64 ;;
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esac ;;
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esac
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fi
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done
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IFS="$acl_save_IFS"
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if test $HOST_CPU_C_ABI_32BIT = yes; then
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# 32-bit ABI.
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acl_libdirstem3=
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fi
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if test $HOST_CPU_C_ABI_32BIT = no; then
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# 64-bit ABI.
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acl_libdirstem2=
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fi
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fi
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;;
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esac
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test -n "$acl_libdirstem2" || acl_libdirstem2="$acl_libdirstem"
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test -n "$acl_libdirstem3" || acl_libdirstem3="$acl_libdirstem"
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acl_cv_libdirstems="$acl_libdirstem,$acl_libdirstem2,$acl_libdirstem3"
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])
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dnl Decompose acl_cv_libdirstems into acl_libdirstem, acl_libdirstem2, and
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dnl acl_libdirstem3.
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changequote(,)dnl
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acl_libdirstem=`echo "$acl_cv_libdirstems" | sed -e 's/,.*//'`
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acl_libdirstem2=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,//' -e 's/,.*//'`
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acl_libdirstem3=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,[^,]*,//' -e 's/,.*//'`
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changequote([,])dnl
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])
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