Add simple detection macros for libcneartree and libgerbv.

diff --git a/m4/cneartree.m4 b/m4/cneartree.m4
new file mode 100644 (file)
index 0000000..edc7bb3
--- /dev/null
+++ b/m4/cneartree.m4
@@ -0,0 +1,40 @@
+dnl Copyright © 2018 Nick Bowler
+dnl
+dnl License WTFPL2: Do What The Fuck You Want To Public License, version 2.
+dnl This is free software: you are free to do what the fuck you want to.
+dnl There is NO WARRANTY, to the extent permitted by law.
+
+dnl DX_LIB_CNEARTREE([min-version], [action-if-ok], [acton-if-failed])
+dnl
+dnl Search for a working CNearTree installation.  If such a library is found,
+dnl appropriate compiler and linker flags are stored in CNEARTREE_CFLAGS and
+dnl CNEARTREE_LIBS, respectively, and the action-if-ok is performed (may be
+dnl empty).  If no suitable library is found, then action-if-failed is
+dnl performed if non-empty, otherwise configure will stop with a fatal error.
+AC_DEFUN([DX_LIB_CNEARTREE],
+[DX_LIB_SETUP([cneartree])AC_MSG_CHECKING([for libCNearTree])
+DX_LIB_SEARCH_LINK([cneartree],
+  [m4_apply([_DX_LIB_CNEARTREE_TEST], m4_split([$1], [\.]))],
+  [ [[$CNEARTREE_CFLAGS], [$CNEARTREE_LIBS]],
+    [[], [-lCNearTree]],
+    [[], [-lCNearTree -lCVector]] ])
+AS_IF([test x"$dx_cv_cneartree_lib_found" = x"yes"], [$2],
+  [m4_default([$3], [AC_MSG_FAILURE([dnl
+libCNearTree is required.  The latest
+version may be found at <http://neartree.sourceforge.net/>.
+m4_newline([DX_LIB_USERFLAG_BLURB([cneartree])])
+])])])])
+
+dnl Internal test program for CNearTree.  The version test is currently
+dnl unimplemented.
+m4_define([_DX_LIB_CNEARTREE_TEST], [AC_LANG_PROGRAM([dnl
+#include <CNearTree.h>
+], [dnl
+CNearTreeHandle t;
+CVectorHandle v;
+void *p;
+CNearTreeCreate(&t, 2, CNEARTREE_TYPE_DOUBLE|CNEARTREE_NORM_L2);
+CNearTreeObjects(t, &v);
+CVectorGetElement(v, &p, 0);
+CNearTreeFree(&t);
+])])

diff --git a/m4/libgerbv.m4 b/m4/libgerbv.m4
new file mode 100644 (file)
index 0000000..f6438e8
--- /dev/null
+++ b/m4/libgerbv.m4
@@ -0,0 +1,38 @@
+dnl Copyright © 2018 Nick Bowler
+dnl
+dnl License WTFPL2: Do What The Fuck You Want To Public License, version 2.
+dnl This is free software: you are free to do what the fuck you want to.
+dnl There is NO WARRANTY, to the extent permitted by law.
+
+dnl DX_LIB_LIBGERBV([min-version], [action-if-ok], [action-if-failed])
+dnl
+dnl Search for a working libgerbv installation.  If such a library is found,
+dnl appropriate compiler and linker flags are stored in LIBGERBV_CFLAGS and
+dnl LIBGERBV_LIBS, respectively, and the action-if-ok is performed (may be
+dnl empty).  If no suitable library is found, then action-if-failed is
+dnl performed if non-empty, otherwise configure will stop with a fatal error.
+AC_DEFUN([DX_LIB_LIBGERBV],
+[DX_LIB_SETUP([libgerbv])DX_LIB_PKGCONFIG_FLAGS([libgerbv])
+AC_MSG_CHECKING([for libgerbv])
+DX_LIB_SEARCH_LINK([libgerbv],
+  [m4_apply([_DX_LIB_LIBGERBV_TEST], m4_split([$1], [\.]))],
+  [ [[$LIBGERBV_CFLAGS], [$LIBGERBV_LIBS]],
+    [[$dx_cv_libgerbv_pkg_cflags], [$dx_cv_libgerbv_pkg_libs],
+      [test x"$dx_cv_libgerbv_pkg_found" = x"yes"]],
+    [[], [-lgerbv]] ])
+AS_IF([test x"$dx_cv_libgerbv_lib_found" = x"yes"], [$2],
+  [m4_default([$3], [AC_MSG_FAILURE([dnl
+libgerbv is required.  The latest
+version may be found at <http://gerbv.geda-project.org/>.
+m4_newline([DX_LIB_USERFLAG_BLURB([libgerbv])])
+m4_newline([DX_LIB_PKGCONFIG_BLURB([libgerbv])])
+])])])])
+
+dnl Internal test program for libgerbv.  The version test is currently
+dnl unimplemented.
+m4_define([_DX_LIB_LIBGERBV_TEST], [AC_LANG_PROGRAM([dnl
+#include <gerbv.h>
+], [dnl
+gerbv_project_t *gp = gerbv_create_project();
+gerbv_destroy_project(gp);
+])])