| # lib-prefix.m4 serial 17 |
| dnl Copyright (C) 2001-2005, 2008-2019 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 |
| ]) |
