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# find_system_lib.m4 - Macros to search for a system library. -*- Autoconf -*-
dnl requires pkg.m4 from pkg-config
dnl requires ax_save_flags.m4 from autoconf-archive
dnl requires ax_restore_flags.m4 from autoconf-archive
dnl FIND_SYSTEM_LIBRARY(VARIABLE-PREFIX, MODULE, HEADER, HEADER-PREFIXES, LIBRARY, FUNCTIONS, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AC_DEFUN([FIND_SYSTEM_LIBRARY], [
AC_REQUIRE([PKG_PROG_PKG_CONFIG])
_library_found=
PKG_CHECK_MODULES([$1], [$2], [_library_found=1], [
AS_IF([test -f /usr/include/[$3]], [
AC_SUBST([$1][_CFLAGS], [])
AC_SUBST([$1][_LIBS], ["-l[$5]]")
_library_found=1
],[ AS_IF([test -f /usr/local/include/[$3]], [
AC_SUBST([$1][_CFLAGS], ["-I/usr/local/include"])
AC_SUBST([$1][_LIBS], ["-L/usr/local -l[$5]]")
_library_found=1
],[dnl ELSE
m4_foreach([prefix], [$4], [
AS_IF([test "x$_library_found" != "x1"], [
AS_IF([test -f [/usr/include/]prefix[/][$3]], [
AC_SUBST([$1][_CFLAGS], ["[-I/usr/include/]prefix["]])
AC_SUBST([$1][_LIBS], ["-l[$5]]")
_library_found=1
],[ AS_IF([test -f [/usr/local/include/]prefix[/][$3]], [
AC_SUBST([$1][_CFLAGS], ["[-I/usr/local/include/]prefix["]])
AC_SUBST([$1][_LIBS], ["-L/usr/local -l[$5]"])
_library_found=1
])])
])
])
])])
AS_IF([test -z "$_library_found"], [
AC_MSG_WARN([cannot find [$2] via pkg-config or in the standard locations])
])
])
dnl do some further sanity checks
AS_IF([test -n "$_library_found"], [
AX_SAVE_FLAGS
CPPFLAGS="$CPPFLAGS $(echo $[$1][_CFLAGS] | sed 's/-include */-include-/g; s/^/ /; s/ [^-][^ ]*//g; s/ -[^Ii][^ ]*//g; s/-include-/-include /g; s/^ //;')"
CFLAGS="$CFLAGS $[$1][_CFLAGS]"
LDFLAGS="$LDFLAGS $[$1][_LIBS]"
AC_CHECK_HEADER([$3], [], [
AC_MSG_WARN([header [$3] for library [$2] is not usable])
_library_found=
])
m4_foreach([func], [$6], [
AC_CHECK_LIB([$5], func, [], [
AC_MSG_WARN([cannot find ]func[ in library [$5]])
_library_found=
])
])
AX_RESTORE_FLAGS
])
AS_IF([test -n "$_library_found"], [
:;$7
],[dnl ELSE
:;$8
])
])
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