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Diffstat (limited to 'm4/lib-pathname.m4')
| -rw-r--r-- | m4/lib-pathname.m4 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/m4/lib-pathname.m4 b/m4/lib-pathname.m4 new file mode 100644 index 000000000000..11f6cab0673d --- /dev/null +++ b/m4/lib-pathname.m4 @@ -0,0 +1,54 @@ +dnl Determine the library path name. +dnl +dnl Red Hat systems and some other Linux systems use lib64 and lib32 rather +dnl than just lib in some circumstances. This file provides an Autoconf +dnl macro, RRA_SET_LDFLAGS, which given a variable, a prefix, and an optional +dnl suffix, adds -Lprefix/lib, -Lprefix/lib32, or -Lprefix/lib64 to the +dnl variable depending on which directories exist and the size of a long in +dnl the compilation environment. If a suffix is given, a slash and that +dnl suffix will be appended, to allow for adding a subdirectory of the library +dnl directory. +dnl +dnl The canonical version of this file is maintained in the rra-c-util +dnl package, available at <https://www.eyrie.org/~eagle/software/rra-c-util/>. +dnl +dnl Written by Russ Allbery <eagle@eyrie.org> +dnl Copyright 2021 Russ Allbery <eagle@eyrie.org> +dnl Copyright 2008-2009 +dnl The Board of Trustees of the Leland Stanford Junior University +dnl +dnl This file is free software; the authors give unlimited permission to copy +dnl and/or distribute it, with or without modifications, as long as this +dnl notice is preserved. +dnl +dnl SPDX-License-Identifier: FSFULLR + +dnl Probe for the alternate library name that we should attempt on this +dnl architecture, given the size of an int, and set rra_lib_arch_name to that +dnl name. Separated out so that it can be AC_REQUIRE'd and not run multiple +dnl times. +dnl +dnl There is an unfortunate abstraction violation here where we assume we know +dnl the cache variable name used by Autoconf. Unfortunately, Autoconf doesn't +dnl provide any other way of getting at that information in shell that I can +dnl see. +AC_DEFUN([_RRA_LIB_ARCH_NAME], +[rra_lib_arch_name=lib + AC_CHECK_SIZEOF([long]) + AS_IF([test "$ac_cv_sizeof_long" -eq 4], + [rra_lib_arch_name=lib32], + [AS_IF([test "$ac_cv_sizeof_long" -eq 8], + [rra_lib_arch_name=lib64])])]) + +dnl Set VARIABLE to -LPREFIX/lib{,32,64} or -LPREFIX/lib{,32,64}/SUFFIX as +dnl appropriate. +AC_DEFUN([RRA_SET_LDFLAGS], +[AC_REQUIRE([_RRA_LIB_ARCH_NAME]) + AS_IF([test -d "$2/$rra_lib_arch_name"], + [AS_IF([test x"$3" = x], + [$1="[$]$1 -L$2/${rra_lib_arch_name}"], + [$1="[$]$1 -L$2/${rra_lib_arch_name}/$3"])], + [AS_IF([test x"$3" = x], + [$1="[$]$1 -L$2/lib"], + [$1="[$]$1 -L$2/lib/$3"])]) + $1=`AS_ECHO(["[$]$1"]) | sed -e 's/^ *//'`]) |