Add multiple build support styles

* Add RPM and DEB packaging targets (using CPack from CMake) to build
  binary packages for Fedora and Ubuntu targets.
* Add Docker build scripts for each of the above that run the build in
  the right environment (assuming docker is available).
 - In Ubuntu, build against the LLVM 3.7 nightly snapshots
 - In Fedora, build against LLVM 3.7 from git (takes longer)
* Depending on packages installed on the build machine, it may be
  possible to cross-package for other targets without invoking Docker.
* Re-introduce src/cc/compat directory to keep the build stable for the
  time being. Similarly, it was necessary to #define some ugly constants
  that should eventually show up in libc.
* Add a few simple version checks to allow a partially working (really
  tracing only) libbcc in 4.1 kernels.

TODO (followup commit): Re-work the READMEs

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

.dockerignore

@@ -0,0 +1,3 @@
+Dockerfile*
+build
+.*.swp

CMakeLists.txt

@@ -2,8 +2,8 @@
 # Licensed under the Apache License, Version 2.0 (the "License")
 cmake_minimum_required(VERSION 2.8.7)
 
-project(bpf-tools)
-set(CMAKE_BUILD_TYPE Debug)
+project(bcc)
+set(CMAKE_BUILD_TYPE Release)
 
 enable_testing()
 
@@ -21,7 +21,7 @@ message(STATUS "Found LLVM: ${LLVM_INCLUDE_DIRS}")
 
 # clang is linked as a library, but the library path searching is
 # primitively supported, unlike libLLVM
-set(CLANG_SEARCH "/opt/local/llvm/lib;${LLVM_LIBRARY_DIRS}")
+set(CLANG_SEARCH "/opt/local/llvm/lib;/usr/lib/llvm-3.7/lib;${LLVM_LIBRARY_DIRS}")
 find_library(libclangAnalysis NAMES clangAnalysis HINTS ${CLANG_SEARCH})
 find_library(libclangAST NAMES clangAST HINTS ${CLANG_SEARCH})
 find_library(libclangBasic NAMES clangBasic HINTS ${CLANG_SEARCH})
@@ -48,3 +48,17 @@ endif()
 add_subdirectory(scripts)
 add_subdirectory(src)
 add_subdirectory(tests)
+
+set(CPACK_PACKAGE_NAME "libbcc")
+set(CPACK_PACKAGE_VERSION "${REVISION}")
+set(CPACK_PACKAGE_CONTACT "Brenden Blanco <bblanco@plumgrid.com")
+if(EXISTS "/etc/redhat-release")
+  set(CPACK_GENERATOR "RPM")
+else()
+  set(CPACK_GENERATOR "DEB")
+endif()
+set(CPACK_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
+set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "amd64")
+set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6, libstdc++6, python")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Shared Library for BPF Compiler Collection (BCC)")
+include(CPack)

Dockerfile.fedora

@@ -0,0 +1,21 @@
+# File to be used for building an Ubuntu .deb
+
+FROM fedora
+
+MAINTAINER Brenden Blanco <bblanco@plumgrid.com>
+
+RUN dnf -y install @rpm-development-tools @c-development @development-tools cmake libstdc++-static
+
+WORKDIR /root
+RUN git clone https://github.com/llvm-mirror/llvm.git
+RUN git clone https://github.com/llvm-mirror/clang.git llvm/tools/clang
+RUN mkdir -p /root/llvm/build
+WORKDIR /root/llvm/build
+RUN cmake .. -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="ARM;CppBackend;X86;BPF"
+RUN make -j$(grep -c ^process /proc/cpuinfo)
+
+RUN mkdir -p /root/bcc/build
+COPY ./ /root/bcc/
+WORKDIR /root/bcc/build
+RUN cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_PREFIX_PATH=/root/llvm/build
+RUN make -j$(grep -c ^process /proc/cpuinfo) package

Dockerfile.ubuntu

@@ -0,0 +1,19 @@
+# File to be used for building an Ubuntu .deb
+
+FROM ubuntu:trusty
+
+MAINTAINER Brenden Blanco <bblanco@plumgrid.com>
+
+RUN apt-get -y install wget
+RUN printf "deb http://llvm.org/apt/trusty/ llvm-toolchain-trusty main\ndeb-src http://llvm.org/apt/trusty/ llvm-toolchain-trusty main\n" > /etc/apt/sources.list.d/llvm.list
+RUN wget -q -O - http://llvm.org/apt/llvm-snapshot.gpg.key | apt-key add -
+RUN apt-get -y update
+
+RUN apt-get -y install bison build-essential cmake flex git libedit-dev python zlib1g-dev
+RUN apt-get -y install libllvm3.7 llvm-3.7-dev libclang-3.7-dev
+
+RUN mkdir -p /root/bcc/build
+COPY ./ /root/bcc/
+WORKDIR /root/bcc/build
+RUN cmake .. -DCMAKE_INSTALL_PREFIX=/usr
+RUN make -j$(grep -c ^process /proc/cpuinfo) package

scripts/CMakeLists.txt

@@ -5,15 +5,17 @@ string(SUBSTRING "${GIT_SHA1}" 0 8 GIT_SHA1_SHORT)
 git_describe(GIT_DESCRIPTION)
 git_describe(GIT_TAG_LAST "--abbrev=0")
 git_get_exact_tag(GIT_TAG_EXACT)
-string(SUBSTRING "${GIT_TAG_LAST}-${GIT_SHA1_SHORT}" 1 -1 REVISION)
-if(GIT_TAG_EXACT)
-  string(SUBSTRING "${GIT_TAG_EXACT}" 1 -1 REVISION)
-  message(STATUS "Currently on Git tag ${GIT_TAG_EXACT}")
-else ()
-  message(STATUS "Latest recognized Git tag is ${GIT_TAG_LAST}")
-  set(GIT_TAG_EXACT "")
+if(NOT REVISION)
+  string(SUBSTRING "${GIT_TAG_LAST}-${GIT_SHA1_SHORT}" 1 -1 REVISION)
+  if(GIT_TAG_EXACT)
+    string(SUBSTRING "${GIT_TAG_EXACT}" 1 -1 REVISION)
+    message(STATUS "Currently on Git tag ${GIT_TAG_EXACT}")
+  else ()
+    message(STATUS "Latest recognized Git tag is ${GIT_TAG_LAST}")
+    set(GIT_TAG_EXACT "")
+  endif()
+  message(STATUS "Git HEAD is ${GIT_SHA1}")
 endif()
-message(STATUS "Git HEAD is ${GIT_SHA1}")
 
 # strip leading 'v', and make unique for the tag
 message(STATUS "Revision is ${REVISION}")

scripts/bpf_demo.ks.erb

@@ -117,7 +117,6 @@ numcpu=$(grep -c ^processor /proc/cpuinfo)
 git clone https://github.com/iovisor/bcc.git
 mkdir bcc/build/
 cd bcc/build/
-git checkout bblanco_dev
 export PATH=/opt/local/llvm/bin:$PATH
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr
 make -j$numcpu

src/cc/CMakeLists.txt

@@ -3,6 +3,8 @@
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${LLVM_INCLUDE_DIRS})
+# todo: if check for kernel version
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/compat)
 add_definitions(${LLVM_DEFINITIONS})
 
 BISON_TARGET(Parser parser.yy ${CMAKE_CURRENT_BINARY_DIR}/parser.yy.cc COMPILE_FLAGS "-o parser.yy.cc -v --debug")

src/cc/b_frontend_action.cc

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 #include <linux/bpf.h>
+#include <linux/version.h>
 
 #include <clang/AST/ASTConsumer.h>
 #include <clang/AST/ASTContext.h>
@@ -373,8 +374,10 @@ bool BTypeVisitor::VisitVarDecl(VarDecl *Decl) {
       map_type = BPF_MAP_TYPE_HASH;
     else if (A->getName() == "maps/array")
       map_type = BPF_MAP_TYPE_ARRAY;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
     else if (A->getName() == "maps/prog")
       map_type = BPF_MAP_TYPE_PROG_ARRAY;
+#endif
     table.fd = bpf_create_map(map_type, table.key_size, table.leaf_size, table.max_entries);
     if (table.fd < 0) {
       llvm::errs() << "error: could not open bpf fd\n";