The "cscope" make target piped a list of files into "cscope -bq", but
this command doesn't read its input. The command should be "cscope -bq -i-"
which reads the list of files from stdin.

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>

This will generate cscope index for the source files.

Signed-off-by: Liu Yuan <namei.unix@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Currently, OSv's "make" builds both the kernel, using a normal Makefile,
and the sample management framework, using the "Gradle" tool.

We carefully hid Gradle's progress under one output line "GRADLE", but
this leads to the "make" process hanging for a long time - up to several
minutes, and all the puzzled user sees is the line "GRADLE". Users who
didn't go for coffee will likely kill the build at this point ;-) Even
worse, when Gradle fails, or just hangs (e.g., a bad or slow network
connection), the user won't even know why.

So let's just run Gradle normally, and let the user see its full output.
This output is rather pretty and organized, so no real reason to hide it.

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>

Each of the "tags" and "TAGS" make targets was done in a different way,
causing each to have a different problem:

 1. "tags" (ctags) used the "-L" option which turns out is nonportable
    (only available in Exuberant Ctags).
 2. "TAGS" (etags) ran the etags command separately for each source file,
    slowing it down.

The best of both worlds is to use xargs to have ctags/etags operate on
multiple files in each run using xargs. Because we cannot be sure xargs
will run ctags/etags only once, we must delete the file first and use
 the "-a" (append) option.

Also, this patch reduces code duplication - there is now one rule for
both "tags" and "TAGS" targets that uses the correct tool (ctags or etags,
respectively).

Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>

Added comments to explain the target tags and TAGS,
also ignore the output file of ctags.

Signed-off-by: Yang Bai <hamo.by@gmail.com>

add TAGS target to Makefile to support etags.

Signed-off-by: Yang Bai <hamo.by@gmail.com>

Running "ctags -R" takes a long time because of git submodules:

  [penberg@localhost osv]$ time ctags -R

  real	0m35.076s
  user	0m18.770s
  sys	0m3.929s

Add a "make tags" target that's much faster to run:

  [penberg@localhost osv]$ time make tags
  find . -name "*.cc" -o -name "*.hh" -o -name "*.h" -o -name "*.c" | ctags -L -

  real	0m0.980s
  user	0m1.033s
  sys	0m0.158s

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Add a "qcow2" target to Makefile that uses "qemu-img convert" to build a
smaller qcow2 image out of the OSv raw image.

Eclipse recognizes .mk as a makefile, make it easier for new users to
use eclipse.

We need to ifdef out more unused code to not make gcc complain.

Added build ("make") framework for compiling Java code we want to run in
OSv (in/with the Java payload), as well as JNI, i.e., OSv-specific C code
we want to run from the above Java code.

The Java source files in java/src/ are now all compiled during build
(see java/build.xml for the Ant file doing this compilation) and the
result is one JAR, build/$mode/java/cloudius.jar (/cloudius.jar in bootfs).
We can easily change build.xml to create more than one if we want.

As an example of JNI, I used the not-working-yet balloon feature.
java/src/com/cloudius/balloon/Balloon.java is the class
com.cloudius.balloon.Balloon which is supposed to have one "native"
(implemented in C) function giveup(). This function's implementation is
in java/jni/balloon.c. We get this file to compile to balloon.so (put
in /usr/lib/jni in the bootfs) by adding java/jni/balloon.so to the
"jni" list in build.mak.

If you don't know how write the ugly function signature as seen in
java/jni/balloon.c, you can run "javah com.cloudius.balloon.Balloon"
to build the empty functions needed for implementing the native functions
defined in the above class.

If a target fails to build, it is probably corrupted.  Delete it.

Fixes misbuild after a second make with an incorrect bootfs.manifest.

Not completely silent unfortunately.

One test so far: java.lang.System.nanoTime()

We're only about 500% slower than native.

-MD accepts no argument, and luckily the argument we supplied evaluated to
nothing.  Remove it.

the -MP switch allows make to ignore deleted files.

this gives us better dependency tracking.

We need different rules for .s (compiled by 'gas') and .S ('gcc') since
the compiler and assembler take different command line options.

It's as arch-specific as they come.

This implementation stores small objects in pools of similar-sized objects,
while large objects are allocated using a first-fit algorithm.  There is also
a specialized interface for allocating aligned pages.