# ldd.m4 serial 1

dnl Copyright (C) 2006, 2009-2020 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.

# Sets LDDPROG to a command and LDDPOSTPROC to a filter command, such that

#   $LDDPROG program $LDDPOSTPROC

# outputs a whitespace-separated list of the dynamically linked dependencies

# of the program, as library names (no full pathnames), or nothing if the

# program is statically linked or if the service is not supported on the given

# system.

dnl From Bruno Haible.

AC_DEFUN([gl_LDD],

[

  AC_REQUIRE([AC_CANONICAL_HOST])

  AC_REQUIRE([AC_PROG_CC])

  dnl Default values.

  LDDPROG=':'

  LDDPOSTPROC=

  dnl First try objdump, since it works when cross-compiling.

  AC_CHECK_TOOL([OBJDUMP], [objdump], [false])

changequote(,)dnl

  if test "$OBJDUMP" != "false"; then

    LDDPROG="$OBJDUMP -p"

    dnl The output of "LC_ALL=C objdump -p program" of a program or library

    dnl looks like this:

    dnl

    dnl libnet.so:     file format elf32-i386

    dnl

    dnl Program Header:

    dnl     LOAD off    0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12

    dnl          filesz 0x0001391d memsz 0x0001391d flags r-x

    dnl     LOAD off    0x00013920 vaddr 0x00014920 paddr 0x00014920 align 2**12

    dnl          filesz 0x00001874 memsz 0x0001b020 flags rw-

    dnl  DYNAMIC off    0x00015104 vaddr 0x00016104 paddr 0x00016104 align 2**2

    dnl          filesz 0x00000090 memsz 0x00000090 flags rw-

    dnl

    dnl Dynamic Section:

    dnl   NEEDED      libroot.so

    dnl   SONAME      libnet.so

    dnl   SYMBOLIC    0x0

    dnl   INIT        0x2aec

    dnl   FINI        0x12a2c

    dnl   HASH        0x94

    dnl   STRTAB      0x1684

    dnl   SYMTAB      0x774

    dnl   STRSZ       0xbd5

    dnl   SYMENT      0x10

    dnl   PLTGOT      0x15f20

    dnl   PLTRELSZ    0x320

    dnl   PLTREL      0x11

    dnl   JMPREL      0x27cc

    dnl   REL         0x225c

    dnl   RELSZ       0x570

    dnl   RELENT      0x8

    LDDPOSTPROC="2>/dev/null | sed -n -e 's,^  NEEDED *\\([^ ].*\\)\$,\\1,p'"

  else

    if test "$cross_compiling" = no; then

      dnl Not cross-compiling. Try system dependent vendor tools.

      case "$host_os" in

        aix*)

          LDDPROG="dump -H"

          dnl The output of "LC_ALL=C dump -H program" looks like this:

          dnl

          dnl program:

          dnl

          dnl                         ***Loader Section***

          dnl                       Loader Header Information

          dnl VERSION#         #SYMtableENT     #RELOCent        LENidSTR

          dnl 0x00000001       0x00000005       0x0000000d       0x0000001e

          dnl

          dnl #IMPfilID        OFFidSTR         LENstrTBL        OFFstrTBL

          dnl 0x00000002       0x00000134       0x0000000d       0x00000152

          dnl

          dnl

          dnl                         ***Import File Strings***

          dnl INDEX  PATH                          BASE                MEMBER

          dnl 0      /usr/lib:/lib

          dnl 1                                    libc.a              shr.o

          dnl

          LDDPOSTPROC="2>/dev/null | sed -e '/^[^0-9]/d' -e '/^0x/d' | sed -n -e 's,^[0-9]*         *\\([^ 	]*\\).*\$,\\1,p' | sed -e 's,^.*/,,'"

          ;;

        darwin*)

          LDDPROG="otool -L"

          dnl The output of "otool -L program" looks like this:

          dnl program:

          dnl         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 71.1.4)

          LDDPOSTPROC="2>/dev/null | sed -n -e 's,^	\\([^ 	]*\\).*\$,\\1,p' | sed -e 's,^.*/,,'"

          ;;

        hpux*)

          LDDPROG="chatr"

          dnl The output of "LC_ALL=C chatr program" looks like this:

          dnl program:

          dnl          shared executable

          dnl          shared library dynamic path search:

          dnl              SHLIB_PATH     disabled  second

          dnl              embedded path  disabled  first  Not Defined

          dnl          shared library list:

          dnl              dynamic   /usr/lib/libc.2

          dnl          shared library binding:

          dnl              deferred

          dnl          global hash table disabled

          dnl          plabel caching disabled

          dnl          global hash array size:1103

          dnl          global hash array nbuckets:3

          dnl          shared vtable support disabled

          dnl          static branch prediction disabled

          dnl          executable from stack: D (default)

          dnl          kernel assisted branch prediction enabled

          dnl          lazy swap allocation disabled

          dnl          text segment locking disabled

          dnl          data segment locking disabled

          dnl          third quadrant private data space disabled

          dnl          fourth quadrant private data space disabled

          dnl          third quadrant global data space disabled

          dnl          data page size: D (default)

          dnl          instruction page size: D (default)

          dnl          nulptr references disabled

          dnl          shared library private mapping disabled

          dnl          shared library text merging disabled

          dnl

          dnl or like this:

          dnl a.out:

          dnl          32-bit ELF executable

          dnl          shared library dynamic path search:

          dnl              LD_LIBRARY_PATH    enabled  first

          dnl              SHLIB_PATH         enabled  second

          dnl              embedded path      enabled  third  /usr/lib/hpux32:/opt/langtools/lib/hpux32

          dnl          shared library list:

          dnl              libc.so.1

          dnl          shared library binding:

          dnl              deferred

          dnl          global hash table disabled

          dnl          global hash table size 1103

          dnl          shared library mapped private disabled

          dnl          shared library segment merging disabled

          dnl          shared vtable support disabled

          dnl          explicit unloading disabled

          dnl          segments:

          dnl              index type     address      flags size

          dnl                  7 text     04000000     z---c-    D (default)

          dnl                  8 data     40000000     ---m--    D (default)

          dnl          executable from stack: D (default)

          dnl          kernel assisted branch prediction enabled

          dnl          lazy swap allocation for dynamic segments disabled

          dnl          nulptr references disabled

          dnl          address space model: default

          dnl          caliper dynamic instrumentation disabled

          dnl

          LDDPOSTPROC="2>/dev/null | sed -e '1,/shared library list:/d' -e '/shared library binding:/,\$d' | sed -e 's,^.*[ 	]\\([^ 	][^ 	]*\\)\$,\\1,' | sed -e 's,^.*/,,'"

          ;;

        irix*)

          LDDPROG="elfdump -Dl"

          dnl The output of "elfdump -Dl program" looks like this:

          dnl

          dnl program:

          dnl

          dnl                    **** MIPS LIBLIST INFORMATION ****

          dnl .liblist :

          dnl [INDEX] Timestamp               Checksum        Flags   Name            Version

          dnl [1]     Oct  2 05:19:12 1999    0x867bf7a8      -----   libc.so.1       sgi1.0

          dnl

          LDDPOSTPROC="2>/dev/null | sed -n -e 's,^[[][0-9]*[]].*	0x[^	]*	[^	][^	]*	\\([^	][^	]*\\).*\$,\\1,p' | sed -e 's,^.*/,,'"

          ;;

        linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu) # glibc-based systems

          LDDPROG="ldd"

          dnl The output of "ldd program" looks like this:

          dnl         libc.so.6 => /lib/libc.so.6 (0x4002d000)

          dnl         /lib/ld-linux.so.2 (0x40000000)

          LDDPOSTPROC="2>/dev/null | sed -n -e 's,^	\\([^ 	][^ 	]*\\).*\$,\\1,p' | sed -e 's,^.*/,,'"

          ;;

        osf*)

          LDDPROG="odump -Dl"

          dnl The output of "odump -Dl program" looks like this:

          dnl

          dnl                         ***LIBRARY LIST SECTION***

          dnl         Name             Time-Stamp        CheckSum   Flags Version

          dnl program:

          dnl         libc.so      Dec 30 00:09:30 1997 0x5e955f9b     0 osf.1

          dnl

          LDDPOSTPROC="2>/dev/null | sed -n -e 's,^	\\([^ 	][^ 	]*\\).*,\\1,p' | sed -e '/^Name\$/d' | sed -e 's,^.*/,,'"

          ;;

        solaris*)

          LDDPROG="ldd"

          dnl The output of "ldd program" looks like this:

          dnl         libc.so.1 =>     /usr/lib/libc.so.1

          dnl         libdl.so.1 =>    /usr/lib/libdl.so.1

          dnl         /usr/platform/SUNW,Ultra-5_10/lib/libc_psr.so.1

          dnl The first sed collects the indented lines.

          dnl The second sed extracts the left-hand part.

          dnl The third sed removes directory specifications.

          LDDPOSTPROC="2>/dev/null | sed -n -e 's,^	\\([^ ].*\\)\$,\\1,p' | sed -e 's, =>.*\$,,' | sed -e 's,^.*/,,'"

          ;;

      esac

    fi

  fi

  dnl Avoid locale dependencies.

  if test "$LDDPROG" != ":"; then

    LDDPROG="LC_ALL=C $LDDPROG"

  fi

changequote([,])dnl

  AC_SUBST([LDDPROG])

  AC_SUBST([LDDPOSTPROC])

])