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 _pc_found= 15 16 AS_IF([test -n "$2"], [PKG_CHECK_MODULES([$1], [$2], [ 17 _header_found=1 18 _library_found=1 19 _pc_found=1 20 ], [:])]) 21 22 # set _header_found/_library_found if the user passed in CFLAGS/LIBS 23 AS_IF([test "x$[$1][_CFLAGS]" != x], [_header_found=1]) 24 AS_IF([test "x$[$1][_LIBS]" != x], [_library_found=1]) 25 26 AX_SAVE_FLAGS 27 28 orig_CFLAGS="$CFLAGS" 29 30 for _prefixdir in /usr /usr/local 31 do 32 AS_VAR_PUSHDEF([header_cache], [ac_cv_header_$3]) 33 AS_IF([test "x$_prefixdir" != "x/usr"], [ 34 [$1][_CFLAGS]="-I$lt_sysroot$_prefixdir/include" 35 AS_IF([test "x$_library_found" = x], [ 36 [$1][_LIBS]="-L$lt_sysroot$_prefixdir/lib" 37 ]) 38 ]) 39 CFLAGS="$orig_CFLAGS $[$1][_CFLAGS]" 40 AS_UNSET([header_cache]) 41 AC_CHECK_HEADER([$3], [ 42 _header_found=1 43 break 44 ], [AS_IF([test "x$_header_found" = "x1"], [ 45 # if pkg-config or the user set CFLAGS, fail if the header is unusable 46 AC_MSG_FAILURE([header [$3] for library [$5] is not usable]) 47 ])], [AC_INCLUDES_DEFAULT]) 48 # search for header under HEADER-PREFIXES 49 m4_foreach_w([prefix], [$4], [ 50 [$1][_CFLAGS]=["-I$lt_sysroot$_prefixdir/include/]prefix["] 51 CFLAGS="$orig_CFLAGS $[$1][_CFLAGS]" 52 AS_UNSET([header_cache]) 53 AC_CHECK_HEADER([$3], [ 54 _header_found=1 55 break 56 ], [], [AC_INCLUDES_DEFAULT]) 57 ]) 58 AS_VAR_POPDEF([header_cache]) 59 done 60 61 AS_IF([test "x$_header_found" = "x1"], [ 62 AS_IF([test "x$_library_found" = x], [ 63 [$1][_LIBS]="$[$1]_LIBS -l[$5]" 64 ]) 65 LDFLAGS="$LDFLAGS $[$1][_LIBS]" 66 67 _libcheck=1 68 m4_ifval([$6], 69 [m4_foreach_w([func], [$6], [AC_CHECK_LIB([$5], func, [:], [_libcheck=])])], 70 [AC_CHECK_LIB([$5], [main], [:], [_libcheck=])]) 71 72 AS_IF([test "x$_libcheck" = "x1"], [_library_found=1], 73 [test "x$_library_found" = "x1"], [ 74 # if pkg-config or the user set LIBS, fail if the library is unusable 75 AC_MSG_FAILURE([library [$5] is not usable]) 76 ]) 77 ], [test "x$_library_found" = "x1"], [ 78 # if the user set LIBS, fail if we didn't find the header 79 AC_MSG_FAILURE([cannot find header [$3] for library [$5]]) 80 ]) 81 82 AX_RESTORE_FLAGS 83 84 AS_IF([test "x$_header_found" = "x1" && test "x$_library_found" = "x1"], [ 85 AC_SUBST([$1]_CFLAGS) 86 AC_SUBST([$1]_LIBS) 87 AS_IF([test "x$_pc_found" = "x1"], [ 88 AC_SUBST([$1]_PC, [$2]) 89 ]) 90 AC_DEFINE([HAVE_][$1], [1], [Define if you have [$5]]) 91 $7 92 ],[dnl ELSE 93 AC_SUBST([$1]_CFLAGS, []) 94 AC_SUBST([$1]_LIBS, []) 95 AC_MSG_WARN([cannot find [$5] via pkg-config or in the standard locations]) 96 $8 97 ]) 98]) 99