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Diffstat (limited to 'm4/lib-pathname.m4')
| -rw-r--r-- | m4/lib-pathname.m4 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/m4/lib-pathname.m4 b/m4/lib-pathname.m4 new file mode 100644 index 0000000..fc326a0 --- /dev/null +++ b/m4/lib-pathname.m4 @@ -0,0 +1,55 @@ +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 This file also provides the Autoconf macro RRA_SET_LIBDIR, which sets the +dnl libdir variable to PREFIX/lib{,32,64} as appropriate. +dnl +dnl Written by Russ Allbery <rra@stanford.edu> +dnl Copyright 2008, 2009 Board of Trustees, Leland Stanford Jr. University +dnl +dnl See LICENSE for licensing terms. + +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 "$ac_cv_sizeof_long" -eq 4 && test -d /usr/lib32], + [rra_lib_arch_name=lib32], + [AS_IF([test "$ac_cv_sizeof_long" -eq 8 && test -d /usr/lib64], + [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"])]) + $1=`echo "[$]$1" | sed -e 's/^ *//'`]) + +dnl Set libdir to PREFIX/lib{,32,64} as appropriate. +AC_DEFUN([RRA_SET_LIBDIR], +[AC_REQUIRE([_RRA_LIB_ARCH_NAME]) + AS_IF([test -d "$1/$rra_lib_arch_name"], + [libdir="$1/${rra_lib_arch_name}"], + [libdir="$1/lib"])]) |