1# find_system_lib.m4 - Macros to search for a system library. -*- Autoconf -*- 2 3dnl requires pkg.m4 from pkg-config 4dnl requires ax_save_flags.m4 from autoconf-archive 5dnl requires ax_restore_flags.m4 from autoconf-archive 6 7dnl ZFS_AC_FIND_SYSTEM_LIBRARY(VARIABLE-PREFIX, MODULE, HEADER, HEADER-PREFIXES, LIBRARY, FUNCTIONS, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) 8 9AC_DEFUN([ZFS_AC_FIND_SYSTEM_LIBRARY], [ 10 AC_REQUIRE([PKG_PROG_PKG_CONFIG]) 11 12 _header_found= 13 _library_found= 14 15 AS_IF([test -n "$2"], [PKG_CHECK_MODULES([$1], [$2], [ 16 _header_found=1 17 _library_found=1 18 ], [:])]) 19 20 # set _header_found/_library_found if the user passed in CFLAGS/LIBS 21 AS_IF([test "x$[$1][_CFLAGS]" != x], [_header_found=1]) 22 AS_IF([test "x$[$1][_LIBS]" != x], [_library_found=1]) 23 24 AX_SAVE_FLAGS 25 26 orig_CFLAGS="$CFLAGS" 27 28 for _prefixdir in /usr /usr/local 29 do 30 AS_VAR_PUSHDEF([header_cache], [ac_cv_header_$3]) 31 AS_IF([test "x$_prefixdir" != "x/usr"], [ 32 [$1][_CFLAGS]="-I$lt_sysroot$_prefixdir/include" 33 AS_IF([test "x$_library_found" = x], [ 34 [$1][_LIBS]="-L$lt_sysroot$_prefixdir/lib" 35 ]) 36 ]) 37 CFLAGS="$orig_CFLAGS $[$1][_CFLAGS]" 38 AS_UNSET([header_cache]) 39 AC_CHECK_HEADER([$3], [ 40 _header_found=1 41 break 42 ], [AS_IF([test "x$_header_found" = "x1"], [ 43 # if pkg-config or the user set CFLAGS, fail if the header is unusable 44 AC_MSG_FAILURE([header [$3] for library [$5] is not usable]) 45 ])], [AC_INCLUDES_DEFAULT]) 46 # search for header under HEADER-PREFIXES 47 m4_foreach_w([prefix], [$4], [ 48 [$1][_CFLAGS]=["-I$lt_sysroot$_prefixdir/include/]prefix["] 49 CFLAGS="$orig_CFLAGS $[$1][_CFLAGS]" 50 AS_UNSET([header_cache]) 51 AC_CHECK_HEADER([$3], [ 52 _header_found=1 53 break 54 ], [], [AC_INCLUDES_DEFAULT]) 55 ]) 56 AS_VAR_POPDEF([header_cache]) 57 done 58 59 AS_IF([test "x$_header_found" = "x1"], [ 60 AS_IF([test "x$_library_found" = x], [ 61 [$1][_LIBS]="$[$1]_LIBS -l[$5]" 62 ]) 63 LDFLAGS="$LDFLAGS $[$1][_LIBS]" 64 65 _libcheck=1 66 m4_ifval([$6], 67 [m4_foreach_w([func], [$6], [AC_CHECK_LIB([$5], func, [:], [_libcheck=])])], 68 [AC_CHECK_LIB([$5], [main], [:], [_libcheck=])]) 69 70 AS_IF([test "x$_libcheck" = "x1"], [_library_found=1], 71 [test "x$_library_found" = "x1"], [ 72 # if pkg-config or the user set LIBS, fail if the library is unusable 73 AC_MSG_FAILURE([library [$5] is not usable]) 74 ]) 75 ], [test "x$_library_found" = "x1"], [ 76 # if the user set LIBS, fail if we didn't find the header 77 AC_MSG_FAILURE([cannot find header [$3] for library [$5]]) 78 ]) 79 80 AX_RESTORE_FLAGS 81 82 AS_IF([test "x$_header_found" = "x1" && test "x$_library_found" = "x1"], [ 83 AC_SUBST([$1]_CFLAGS) 84 AC_SUBST([$1]_LIBS) 85 AC_DEFINE([HAVE_][$1], [1], [Define if you have [$5]]) 86 $7 87 ],[dnl ELSE 88 AC_SUBST([$1]_CFLAGS, []) 89 AC_SUBST([$1]_LIBS, []) 90 AC_MSG_WARN([cannot find [$5] via pkg-config or in the standard locations]) 91 $8 92 ]) 93]) 94