llvm-project/polly/autoconf/m4/find_lib_and_headers.m4

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dnl find_lib_and_headers(name, verify-header, library-name, requirded?)
dnl Export
dnl name_inc in -I"include-path" form
dnl name_lib in -l"library-name" form
dnl name_ld in -L"library-path" form
dnl name_found set to "yes" if found
AC_DEFUN([find_lib_and_headers],
[
AC_LANG_PUSH(C++)
OLD_CXXFLAGS=$CXXFLAGS;
OLD_LDFLAGS=$LDFLAGS;
OLD_LIBS=$LIBS;
LIBS="$LIBS -l$3";
# Get include path and lib path
AC_ARG_WITH([$1],
[AS_HELP_STRING([--with-$1], [prefix of $1 ])],
[given_inc_path="$withval/include"; CXXFLAGS="-I$given_inc_path $CXXFLAGS";
given_lib_path="$withval/lib"; LDFLAGS="-L$given_lib_path $LDFLAGS"],
[given_inc_path=inc_not_give_$1;
given_lib_path=lib_not_give_$1]
)
# Check for library and headers works
AC_MSG_CHECKING([for $1 in $given_inc_path, $given_lib_path])
# try to compile a file that includes a header of the library
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <$2>]], [[;]])],
[AC_MSG_RESULT([ok])
AC_SUBST([$1_found],["yes"])
AS_IF([test "x$given_inc_path" != "xinc_not_give_$1"],
[AC_SUBST([$1_inc],["-I$given_inc_path"])])
AC_SUBST([$1_lib],["-l$3"])
AS_IF([test "x$given_lib_path" != "xlib_not_give_$1"],
[AC_SUBST([$1_ld],["-L$given_lib_path"])])],
[AS_IF([test "x$4" = "xrequired"],
[AC_MSG_ERROR([$1 required but not found])],
[AC_MSG_RESULT([not found])])]
)
# reset original CXXFLAGS
CXXFLAGS=$OLD_CXXFLAGS
LDFLAGS=$OLD_LDFLAGS;
LIBS=$OLD_LIBS
AC_LANG_POP(C++)
])