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