lib-prefix.m4 (11944B)
1 # lib-prefix.m4 serial 17 2 dnl Copyright (C) 2001-2005, 2008-2020 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Bruno Haible. 8 9 dnl AC_LIB_PREFIX adds to the CPPFLAGS and LDFLAGS the flags that are needed 10 dnl to access previously installed libraries. The basic assumption is that 11 dnl a user will want packages to use other packages he previously installed 12 dnl with the same --prefix option. 13 dnl This macro is not needed if only AC_LIB_LINKFLAGS is used to locate 14 dnl libraries, but is otherwise very convenient. 15 AC_DEFUN([AC_LIB_PREFIX], 16 [ 17 AC_BEFORE([$0], [AC_LIB_LINKFLAGS]) 18 AC_REQUIRE([AC_PROG_CC]) 19 AC_REQUIRE([AC_CANONICAL_HOST]) 20 AC_REQUIRE([AC_LIB_PREPARE_MULTILIB]) 21 AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) 22 dnl By default, look in $includedir and $libdir. 23 use_additional=yes 24 AC_LIB_WITH_FINAL_PREFIX([ 25 eval additional_includedir=\"$includedir\" 26 eval additional_libdir=\"$libdir\" 27 ]) 28 AC_ARG_WITH([lib-prefix], 29 [[ --with-lib-prefix[=DIR] search for libraries in DIR/include and DIR/lib 30 --without-lib-prefix don't search for libraries in includedir and libdir]], 31 [ 32 if test "X$withval" = "Xno"; then 33 use_additional=no 34 else 35 if test "X$withval" = "X"; then 36 AC_LIB_WITH_FINAL_PREFIX([ 37 eval additional_includedir=\"$includedir\" 38 eval additional_libdir=\"$libdir\" 39 ]) 40 else 41 additional_includedir="$withval/include" 42 additional_libdir="$withval/$acl_libdirstem" 43 fi 44 fi 45 ]) 46 if test $use_additional = yes; then 47 dnl Potentially add $additional_includedir to $CPPFLAGS. 48 dnl But don't add it 49 dnl 1. if it's the standard /usr/include, 50 dnl 2. if it's already present in $CPPFLAGS, 51 dnl 3. if it's /usr/local/include and we are using GCC on Linux, 52 dnl 4. if it doesn't exist as a directory. 53 if test "X$additional_includedir" != "X/usr/include"; then 54 haveit= 55 for x in $CPPFLAGS; do 56 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 57 if test "X$x" = "X-I$additional_includedir"; then 58 haveit=yes 59 break 60 fi 61 done 62 if test -z "$haveit"; then 63 if test "X$additional_includedir" = "X/usr/local/include"; then 64 if test -n "$GCC"; then 65 case $host_os in 66 linux* | gnu* | k*bsd*-gnu) haveit=yes;; 67 esac 68 fi 69 fi 70 if test -z "$haveit"; then 71 if test -d "$additional_includedir"; then 72 dnl Really add $additional_includedir to $CPPFLAGS. 73 CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir" 74 fi 75 fi 76 fi 77 fi 78 dnl Potentially add $additional_libdir to $LDFLAGS. 79 dnl But don't add it 80 dnl 1. if it's the standard /usr/lib, 81 dnl 2. if it's already present in $LDFLAGS, 82 dnl 3. if it's /usr/local/lib and we are using GCC on Linux, 83 dnl 4. if it doesn't exist as a directory. 84 if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then 85 haveit= 86 for x in $LDFLAGS; do 87 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 88 if test "X$x" = "X-L$additional_libdir"; then 89 haveit=yes 90 break 91 fi 92 done 93 if test -z "$haveit"; then 94 if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then 95 if test -n "$GCC"; then 96 case $host_os in 97 linux*) haveit=yes;; 98 esac 99 fi 100 fi 101 if test -z "$haveit"; then 102 if test -d "$additional_libdir"; then 103 dnl Really add $additional_libdir to $LDFLAGS. 104 LDFLAGS="${LDFLAGS}${LDFLAGS:+ }-L$additional_libdir" 105 fi 106 fi 107 fi 108 fi 109 fi 110 ]) 111 112 dnl AC_LIB_PREPARE_PREFIX creates variables acl_final_prefix, 113 dnl acl_final_exec_prefix, containing the values to which $prefix and 114 dnl $exec_prefix will expand at the end of the configure script. 115 AC_DEFUN([AC_LIB_PREPARE_PREFIX], 116 [ 117 dnl Unfortunately, prefix and exec_prefix get only finally determined 118 dnl at the end of configure. 119 if test "X$prefix" = "XNONE"; then 120 acl_final_prefix="$ac_default_prefix" 121 else 122 acl_final_prefix="$prefix" 123 fi 124 if test "X$exec_prefix" = "XNONE"; then 125 acl_final_exec_prefix='${prefix}' 126 else 127 acl_final_exec_prefix="$exec_prefix" 128 fi 129 acl_save_prefix="$prefix" 130 prefix="$acl_final_prefix" 131 eval acl_final_exec_prefix=\"$acl_final_exec_prefix\" 132 prefix="$acl_save_prefix" 133 ]) 134 135 dnl AC_LIB_WITH_FINAL_PREFIX([statement]) evaluates statement, with the 136 dnl variables prefix and exec_prefix bound to the values they will have 137 dnl at the end of the configure script. 138 AC_DEFUN([AC_LIB_WITH_FINAL_PREFIX], 139 [ 140 acl_save_prefix="$prefix" 141 prefix="$acl_final_prefix" 142 acl_save_exec_prefix="$exec_prefix" 143 exec_prefix="$acl_final_exec_prefix" 144 $1 145 exec_prefix="$acl_save_exec_prefix" 146 prefix="$acl_save_prefix" 147 ]) 148 149 dnl AC_LIB_PREPARE_MULTILIB creates 150 dnl - a function acl_is_expected_elfclass, that tests whether standard input 151 dn; has a 32-bit or 64-bit ELF header, depending on the host CPU ABI, 152 dnl - 3 variables acl_libdirstem, acl_libdirstem2, acl_libdirstem3, containing 153 dnl the basename of the libdir to try in turn, either "lib" or "lib64" or 154 dnl "lib/64" or "lib32" or "lib/sparcv9" or "lib/amd64" or similar. 155 AC_DEFUN([AC_LIB_PREPARE_MULTILIB], 156 [ 157 dnl There is no formal standard regarding lib, lib32, and lib64. 158 dnl On most glibc systems, the current practice is that on a system supporting 159 dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under 160 dnl $prefix/lib64 and 32-bit libraries go under $prefix/lib. However, on 161 dnl Arch Linux based distributions, it's the opposite: 32-bit libraries go 162 dnl under $prefix/lib32 and 64-bit libraries go under $prefix/lib. 163 dnl We determine the compiler's default mode by looking at the compiler's 164 dnl library search path. If at least one of its elements ends in /lib64 or 165 dnl points to a directory whose absolute pathname ends in /lib64, we use that 166 dnl for 64-bit ABIs. Similarly for 32-bit ABIs. Otherwise we use the default, 167 dnl namely "lib". 168 dnl On Solaris systems, the current practice is that on a system supporting 169 dnl 32-bit and 64-bit instruction sets or ABIs, 64-bit libraries go under 170 dnl $prefix/lib/64 (which is a symlink to either $prefix/lib/sparcv9 or 171 dnl $prefix/lib/amd64) and 32-bit libraries go under $prefix/lib. 172 AC_REQUIRE([AC_CANONICAL_HOST]) 173 AC_REQUIRE([gl_HOST_CPU_C_ABI_32BIT]) 174 175 AC_CACHE_CHECK([for ELF binary format], [gl_cv_elf], 176 [AC_EGREP_CPP([Extensible Linking Format], 177 [#ifdef __ELF__ 178 Extensible Linking Format 179 #endif 180 ], 181 [gl_cv_elf=yes], 182 [gl_cv_elf=no]) 183 ]) 184 if test $gl_cv_elf; then 185 # Extract the ELF class of a file (5th byte) in decimal. 186 # Cf. https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header 187 if od -A x < /dev/null >/dev/null 2>/dev/null; then 188 # Use POSIX od. 189 func_elfclass () 190 { 191 od -A n -t d1 -j 4 -N 1 192 } 193 else 194 # Use BSD hexdump. 195 func_elfclass () 196 { 197 dd bs=1 count=1 skip=4 2>/dev/null | hexdump -e '1/1 "%3d "' 198 echo 199 } 200 fi 201 changequote(,)dnl 202 case $HOST_CPU_C_ABI_32BIT in 203 yes) 204 # 32-bit ABI. 205 acl_is_expected_elfclass () 206 { 207 test "`func_elfclass | sed -e 's/[ ]//g'`" = 1 208 } 209 ;; 210 no) 211 # 64-bit ABI. 212 acl_is_expected_elfclass () 213 { 214 test "`func_elfclass | sed -e 's/[ ]//g'`" = 2 215 } 216 ;; 217 *) 218 # Unknown. 219 acl_is_expected_elfclass () 220 { 221 : 222 } 223 ;; 224 esac 225 changequote([,])dnl 226 else 227 acl_is_expected_elfclass () 228 { 229 : 230 } 231 fi 232 233 dnl Allow the user to override the result by setting acl_cv_libdirstems. 234 AC_CACHE_CHECK([for the common suffixes of directories in the library search path], 235 [acl_cv_libdirstems], 236 [dnl Try 'lib' first, because that's the default for libdir in GNU, see 237 dnl <https://www.gnu.org/prep/standards/html_node/Directory-Variables.html>. 238 acl_libdirstem=lib 239 acl_libdirstem2= 240 acl_libdirstem3= 241 case "$host_os" in 242 solaris*) 243 dnl See Solaris 10 Software Developer Collection > Solaris 64-bit Developer's Guide > The Development Environment 244 dnl <https://docs.oracle.com/cd/E19253-01/816-5138/dev-env/index.html>. 245 dnl "Portable Makefiles should refer to any library directories using the 64 symbolic link." 246 dnl But we want to recognize the sparcv9 or amd64 subdirectory also if the 247 dnl symlink is missing, so we set acl_libdirstem2 too. 248 if test $HOST_CPU_C_ABI_32BIT = no; then 249 acl_libdirstem2=lib/64 250 case "$host_cpu" in 251 sparc*) acl_libdirstem3=lib/sparcv9 ;; 252 i*86 | x86_64) acl_libdirstem3=lib/amd64 ;; 253 esac 254 fi 255 ;; 256 *) 257 dnl If $CC generates code for a 32-bit ABI, the libraries are 258 dnl surely under $prefix/lib or $prefix/lib32, not $prefix/lib64. 259 dnl Similarly, if $CC generates code for a 64-bit ABI, the libraries 260 dnl are surely under $prefix/lib or $prefix/lib64, not $prefix/lib32. 261 dnl Find the compiler's search path. However, non-system compilers 262 dnl sometimes have odd library search paths. But we can't simply invoke 263 dnl '/usr/bin/gcc -print-search-dirs' because that would not take into 264 dnl account the -m32/-m31 or -m64 options from the $CC or $CFLAGS. 265 searchpath=`(LC_ALL=C $CC $CPPFLAGS $CFLAGS -print-search-dirs) 2>/dev/null \ 266 | sed -n -e 's,^libraries: ,,p' | sed -e 's,^=,,'` 267 if test $HOST_CPU_C_ABI_32BIT != no; then 268 # 32-bit or unknown ABI. 269 if test -d /usr/lib32; then 270 acl_libdirstem2=lib32 271 fi 272 fi 273 if test $HOST_CPU_C_ABI_32BIT != yes; then 274 # 64-bit or unknown ABI. 275 if test -d /usr/lib64; then 276 acl_libdirstem3=lib64 277 fi 278 fi 279 if test -n "$searchpath"; then 280 acl_save_IFS="${IFS= }"; IFS=":" 281 for searchdir in $searchpath; do 282 if test -d "$searchdir"; then 283 case "$searchdir" in 284 */lib32/ | */lib32 ) acl_libdirstem2=lib32 ;; 285 */lib64/ | */lib64 ) acl_libdirstem3=lib64 ;; 286 */../ | */.. ) 287 # Better ignore directories of this form. They are misleading. 288 ;; 289 *) searchdir=`cd "$searchdir" && pwd` 290 case "$searchdir" in 291 */lib32 ) acl_libdirstem2=lib32 ;; 292 */lib64 ) acl_libdirstem3=lib64 ;; 293 esac ;; 294 esac 295 fi 296 done 297 IFS="$acl_save_IFS" 298 if test $HOST_CPU_C_ABI_32BIT = yes; then 299 # 32-bit ABI. 300 acl_libdirstem3= 301 fi 302 if test $HOST_CPU_C_ABI_32BIT = no; then 303 # 64-bit ABI. 304 acl_libdirstem2= 305 fi 306 fi 307 ;; 308 esac 309 test -n "$acl_libdirstem2" || acl_libdirstem2="$acl_libdirstem" 310 test -n "$acl_libdirstem3" || acl_libdirstem3="$acl_libdirstem" 311 acl_cv_libdirstems="$acl_libdirstem,$acl_libdirstem2,$acl_libdirstem3" 312 ]) 313 dnl Decompose acl_cv_libdirstems into acl_libdirstem, acl_libdirstem2, and 314 dnl acl_libdirstem3. 315 changequote(,)dnl 316 acl_libdirstem=`echo "$acl_cv_libdirstems" | sed -e 's/,.*//'` 317 acl_libdirstem2=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,//' -e 's/,.*//'` 318 acl_libdirstem3=`echo "$acl_cv_libdirstems" | sed -e 's/^[^,]*,[^,]*,//' -e 's/,.*//'` 319 changequote([,])dnl 320 ])