tlib-prefix.m4 - vaccinewars - be a doctor and try to vaccinate the world
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---
tlib-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 ])