maint: issue warnings for more missing optional libraries

* README-hacking: Suggest to use ./configure --quiet so that
any warnings are easily noticed.
* m4/gmp.m4 (cu_GMP): Warn if libgmp is not available.
* m4/jm-macros.m4 (coreutils_MACROS): Normalize the libcap warning.
* m4/xattr.m4 (gl_FUNC_XATTR): Warn if libattr is not available.

diff --git a/README-hacking b/README-hacking
index daaa4b1..c5d3128 100644 (file)
--- a/README-hacking
+++ b/README-hacking
@@ -35,7 +35,7 @@ which are extracted from other source packages:
 
 And there you are!  Just
 
-        $ ./configure #[--enable-gcc-warnings]
+        $ ./configure --quiet #[--enable-gcc-warnings]
         $ make
         $ make check
 

diff --git a/m4/gmp.m4 b/m4/gmp.m4
index 8e71120..170c2a1 100644 (file)
--- a/m4/gmp.m4
+++ b/m4/gmp.m4
@@ -30,7 +30,9 @@ AC_DEFUN([cu_GMP],
         LIB_GMP=$ac_cv_search___gmpz_init
         AC_DEFINE([HAVE_GMP], [1],
           [Define if you have GNU libgmp (or replacement)])
-       }])
+       }],
+      [AC_MSG_WARN([libgmp development library was not found or not usable.])
+       AC_MSG_WARN([AC_PACKAGE_NAME will be built without GMP support.])])
     LIBS=$cu_saved_libs
   fi
 ])

diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
index f42f67c..5210499 100644 (file)
--- a/m4/jm-macros.m4
+++ b/m4/jm-macros.m4
@@ -116,7 +116,8 @@ AC_DEFUN([coreutils_MACROS],
       if test "X$enable_libcap" = "Xyes"; then
         AC_MSG_ERROR([libcap library was not found or not usable])
       else
-        AC_MSG_WARN([libcap library was not found or not usable, support for libcap will not be built])
+        AC_MSG_WARN([libcap library was not found or not usable.])
+        AC_MSG_WARN([AC_PACKAGE_NAME will be built without capability support.])
       fi
     fi
   else

diff --git a/m4/xattr.m4 b/m4/xattr.m4
index d340417..bc076b0 100644 (file)
--- a/m4/xattr.m4
+++ b/m4/xattr.m4
@@ -22,6 +22,8 @@ AC_DEFUN([gl_FUNC_XATTR],
       use_xattr=1
     else
       use_xattr=0
+      AC_MSG_WARN([libattr development library was not found or not usable.])
+      AC_MSG_WARN([AC_PACKAGE_NAME will be built without xattr support.])
     fi
     AC_DEFINE_UNQUOTED([USE_XATTR], [$use_xattr],
                        [Define if you want extended attribute support.])