1dnl Determine the library path name. 2dnl 3dnl Red Hat systems and some other Linux systems use lib64 and lib32 rather 4dnl than just lib in some circumstances. This file provides an Autoconf 5dnl macro, RRA_SET_LDFLAGS, which given a variable, a prefix, and an optional 6dnl suffix, adds -Lprefix/lib, -Lprefix/lib32, or -Lprefix/lib64 to the 7dnl variable depending on which directories exist and the size of a long in 8dnl the compilation environment. If a suffix is given, a slash and that 9dnl suffix will be appended, to allow for adding a subdirectory of the library 10dnl directory. 11dnl 12dnl The canonical version of this file is maintained in the rra-c-util 13dnl package, available at <https://www.eyrie.org/~eagle/software/rra-c-util/>. 14dnl 15dnl Written by Russ Allbery <eagle@eyrie.org> 16dnl Copyright 2021 Russ Allbery <eagle@eyrie.org> 17dnl Copyright 2008-2009 18dnl The Board of Trustees of the Leland Stanford Junior University 19dnl 20dnl This file is free software; the authors give unlimited permission to copy 21dnl and/or distribute it, with or without modifications, as long as this 22dnl notice is preserved. 23dnl 24dnl SPDX-License-Identifier: FSFULLR 25 26dnl Probe for the alternate library name that we should attempt on this 27dnl architecture, given the size of an int, and set rra_lib_arch_name to that 28dnl name. Separated out so that it can be AC_REQUIRE'd and not run multiple 29dnl times. 30dnl 31dnl There is an unfortunate abstraction violation here where we assume we know 32dnl the cache variable name used by Autoconf. Unfortunately, Autoconf doesn't 33dnl provide any other way of getting at that information in shell that I can 34dnl see. 35AC_DEFUN([_RRA_LIB_ARCH_NAME], 36[rra_lib_arch_name=lib 37 AC_CHECK_SIZEOF([long]) 38 AS_IF([test "$ac_cv_sizeof_long" -eq 4], 39 [rra_lib_arch_name=lib32], 40 [AS_IF([test "$ac_cv_sizeof_long" -eq 8], 41 [rra_lib_arch_name=lib64])])]) 42 43dnl Set VARIABLE to -LPREFIX/lib{,32,64} or -LPREFIX/lib{,32,64}/SUFFIX as 44dnl appropriate. 45AC_DEFUN([RRA_SET_LDFLAGS], 46[AC_REQUIRE([_RRA_LIB_ARCH_NAME]) 47 AS_IF([test -d "$2/$rra_lib_arch_name"], 48 [AS_IF([test x"$3" = x], 49 [$1="[$]$1 -L$2/${rra_lib_arch_name}"], 50 [$1="[$]$1 -L$2/${rra_lib_arch_name}/$3"])], 51 [AS_IF([test x"$3" = x], 52 [$1="[$]$1 -L$2/lib"], 53 [$1="[$]$1 -L$2/lib/$3"])]) 54 $1=`AS_ECHO(["[$]$1"]) | sed -e 's/^ *//'`]) 55