[PATCHv2 3/3] perf: add helper makefile for cross compiling libs

[Rabin Vincent <rabin.vincent@axis.com>]

It's easy to cross-compile a minimal perf binary without any external
libraries (other than a C library of course).  But many useful features
depend on external libraries, so to get them one needs to either
cross-compile a bunch of libraries manually and send in the correct
paths or integrate the perf build into some external build system.

In order to make it easier for people to qucikly get up and running with
a fairly full featured cross-compiled mainline perf, provide a helper makefile
which can be used to download and build the required libraries, which can then
be used in a static build of perf.

For example, assuming an arm-linux-gcc cross-compiler is present in the
PATH, the following is what one seens if one tries to build a static
perf for ARM:

 $ make ARCH=arm CROSS_COMPILE=arm-linux- LDFLAGS="-static"

 Auto-detecting system features:
 ...                         dwarf: [ OFF ]
 ...                         glibc: [ on  ]
 ...                          gtk2: [ OFF ]
 ...                      libaudit: [ OFF ]
 ...                        libbfd: [ OFF ]
 ...                        libelf: [ OFF ]
 ...                       libnuma: [ OFF ]
 ...        numa_num_possible_cpus: [ OFF ]
 ...                       libperl: [ OFF ]
 ...                     libpython: [ OFF ]
 ...                      libslang: [ OFF ]
 ...                     libunwind: [ OFF ]
 ...            libdw-dwarf-unwind: [ OFF ]
 ...                          zlib: [ OFF ]
 ...                          lzma: [ OFF ]
 ...                     get_cpuid: [ OFF ]

By using the new Makefile.cross first, we get many important features:

 $ make ARCH=arm CROSS_COMPILE=arm-linux- -f Makefile.cross
 $ make ARCH=arm CROSS_COMPILE=arm-linux- LDFLAGS="-static"

  Auto-detecting system features:
  ...                         dwarf: [ on  ]
  ...                         glibc: [ on  ]
  ...                          gtk2: [ OFF ]
  ...                      libaudit: [ on  ]
  ...                        libbfd: [ on  ]
  ...                        libelf: [ on  ]
  ...                       libnuma: [ OFF ]
  ...        numa_num_possible_cpus: [ OFF ]
  ...                       libperl: [ OFF ]
  ...                     libpython: [ OFF ]
  ...                      libslang: [ on  ]
  ...                     libunwind: [ on  ]
  ...            libdw-dwarf-unwind: [ OFF ]
  ...                          zlib: [ on  ]
  ...                          lzma: [ on  ]
  ...                     get_cpuid: [ OFF ]

Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
---
v2: expand commit message, add comments in Makefile, rename to Makefile.cross

 tools/perf/Makefile.cross |  154 +++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/Makefile.perf  |    7 +++
 2 files changed, 161 insertions(+)
 create mode 100644 tools/perf/Makefile.cross

diff --git a/tools/perf/Makefile.cross b/tools/perf/Makefile.cross
new file mode 100644
index 0000000..95dd28a
--- /dev/null
+++ b/tools/perf/Makefile.cross
@@ -0,0 +1,154 @@
+#
+# This is a helper Makefile that downloads and builds many of the optional
+# libraries that perf can use.  This libraries built by this Makefile can be
+# subsequently used in a static build of perf.  The intented use is when cross
+# compiling perf.
+#
+# For example, assuming you have the arm-linux-gcc cross compiler in your PATH,
+# running the following two commands will result in a static ARM build of perf
+# with various features that require external libraries:
+#
+# $ make ARCH=arm CROSS_COMPILE=arm-linux- -f Makefile.cross
+# $ make ARCH=arm CROSS_COMPILE=arm-linux- LDFLAGS="-static"
+#
+
+LIBS += audit
+audit_BASENAME=audit-2.4.4
+audit_ARCHIVE=$(audit_BASENAME).tar.gz
+audit_URL=https://people.redhat.com/sgrubb/audit/$(audit_ARCHIVE)
+
+LIBS += bfd
+bfd_BASENAME=binutils-2.25.1
+bfd_ARCHIVE=$(bfd_BASENAME).tar.bz2
+bfd_URL=http://ftp.gnu.org/gnu/binutils/$(bfd_ARCHIVE)
+
+LIBS += bzip2
+bzip2_BASENAME=bzip2-1.0.6
+bzip2_ARCHIVE=$(bzip2_BASENAME).tar.gz
+bzip2_URL=http://www.bzip.org/1.0.6/$(bzip2_ARCHIVE)
+
+LIBS += elfutils
+elfutils_BASENAME=elfutils-0.163
+elfutils_ARCHIVE=$(elfutils_BASENAME).tar.bz2
+elfutils_URL=https://fedorahosted.org/releases/e/l/elfutils/0.163/$(elfutils_ARCHIVE)
+
+LIBS += lzma
+lzma_BASENAME=xz-5.2.1
+lzma_ARCHIVE=$(lzma_BASENAME).tar.gz
+lzma_URL=http://tukaani.org/xz/$(lzma_ARCHIVE)
+
+LIBS += slang
+slang_BASENAME=slang-2.1.4
+slang_ARCHIVE=$(slang_BASENAME).tar.bz2
+slang_URL=http://ftp.ntua.gr/pub/lang/slang/slang/v2.1/$(slang_ARCHIVE)
+
+LIBS += unwind
+unwind_BASENAME=libunwind-1.1
+unwind_ARCHIVE=$(unwind_BASENAME).tar.gz
+unwind_URL=http://download.savannah.gnu.org/releases/libunwind/$(unwind_ARCHIVE)
+
+LIBS += zlib
+zlib_BASENAME=zlib-1.2.8
+zlib_ARCHIVE=$(zlib_BASENAME).tar.gz
+zlib_URL=http://zlib.net/$(zlib_ARCHIVE)
+
+DLDIR=dl
+DEPSDIR=deps-$(ARCH)
+BUILDDIR=build-$(ARCH)
+HOST=$(shell echo $(CROSS_COMPILE) | sed 's/.$$//')
+PREFIX=$(realpath $(shell pwd))/$(DEPSDIR)
+MAKE1=$(MAKE) -j1
+
+CC=$(CROSS_COMPILE)gcc
+
+export CC
+
+.PHONY: all clean $(LIBS)
+
+all: $(LIBS)
+
+define LIB_template
+$1_DIR=$$(BUILDDIR)/$$($1_BASENAME)
+$1_EXTRACT=$$($1_DIR)/.extract
+$1_INSTALL=$$(DEPSDIR)/lib/.$1.install
+
+$$(DLDIR)/$$($1_ARCHIVE):
+	mkdir -p $$(DLDIR) && cd $$(DLDIR) && wget -N $$($1_URL)
+
+$$($1_EXTRACT): $$(DLDIR)/$$($1_ARCHIVE)
+	mkdir -p $$(BUILDDIR) && tar xf $$< -C $$(BUILDDIR)
+	touch $$@
+
+$1: $$($1_INSTALL)
+
+$1-clean:
+	rm -rf $$($1_DIR)
+endef
+
+$(foreach lib,$(LIBS),$(eval $(call LIB_template,$(lib))))
+
+$(audit_INSTALL): $(audit_EXTRACT)
+	cd $(audit_DIR) && ./configure --host=$(HOST) --prefix=$(PREFIX)
+	$(MAKE) -C $(audit_DIR)/lib
+	$(MAKE) -C $(audit_DIR)/lib install
+	touch $@
+
+CFLAGS=-I$(PREFIX)/include
+LDFLAGS=-L$(PREFIX)/lib
+
+$(bfd_INSTALL): $(zlib_INSTALL) $(bfd_EXTRACT)
+	cd $(bfd_DIR)/libiberty && ./configure --host=$(HOST) --prefix=$(PREFIX) --enable-install-libiberty
+	$(MAKE) -C $(bfd_DIR)/libiberty
+	$(MAKE) -C $(bfd_DIR)/libiberty install
+	cd $(bfd_DIR)/bfd && CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" ./configure --host=$(HOST) --prefix=$(PREFIX) --with-zlib
+	$(MAKE) -C $(bfd_DIR)/bfd
+	$(MAKE) -C $(bfd_DIR)/bfd install
+	touch $@
+
+$(bzip2_INSTALL): $(bzip2_EXTRACT)
+	$(MAKE) -C $(bzip2_DIR) clean
+	$(MAKE) CC="$(CC)" PREFIX=$(PREFIX) -C $(bzip2_DIR) -f Makefile-libbz2_so
+	mkdir -p $(DEPSDIR)/lib
+	cp -a $(bzip2_DIR)/libbz2.so* $(DEPSDIR)/lib/
+	@rm -f $(DEPSDIR)/lib/libbz2.so
+	# The dynamic library is required to prevent errors while building elfutils
+	cd $(DEPSDIR)/lib && ln -s libbz2.so.1.0 libbz2.so
+	$(MAKE) -C $(bzip2_DIR) clean
+	$(MAKE) CC="$(CC)" PREFIX=$(PREFIX) -C $(bzip2_DIR) install
+	touch $@
+
+elfutils_LDFLAGS=$(LDFLAGS) -Wl,-rpath-link $(PREFIX)/lib
+
+$(elfutils_INSTALL): $(zlib_INSTALL) $(lzma_INSTALL) $(bzip2_INSTALL) $(elfutils_EXTRACT)
+	cd $(elfutils_DIR) && CFLAGS="$(CFLAGS)" LDFLAGS="$(elfutils_LDFLAGS)" ./configure --host=$(HOST) --prefix=$(PREFIX) --with-zlib --with-bzlib --with-lzma
+	$(MAKE) -C $(elfutils_DIR)
+	$(MAKE) -C $(elfutils_DIR) install
+	touch $@
+
+$(lzma_INSTALL): $(lzma_EXTRACT)
+	cd $(lzma_DIR) && ./configure --host=$(HOST) --prefix=$(PREFIX)
+	$(MAKE) -C $(lzma_DIR)
+	$(MAKE) -C $(lzma_DIR) install
+	touch $@
+
+$(slang_INSTALL): $(slang_EXTRACT)
+	cd $(slang_DIR) && ./configure --host=$(HOST) --prefix=$(PREFIX)
+	$(MAKE1) -C $(slang_DIR)
+	$(MAKE1) -C $(slang_DIR) install-all
+	touch $@
+
+$(zlib_INSTALL): $(zlib_EXTRACT)
+	cd $(zlib_DIR) && ./configure --prefix=$(PREFIX)
+	$(MAKE) -C $(zlib_DIR)
+	$(MAKE) -C $(zlib_DIR) install
+	touch $@
+
+$(unwind_INSTALL): $(unwind_EXTRACT)
+	cd $(unwind_DIR) && ./configure --host=$(HOST) --prefix=$(PREFIX) --enable-debug --enable-debug-frame
+	cd $(unwind_DIR) && $(MAKE)
+	cd $(unwind_DIR) && $(MAKE) install
+	touch $@
+
+clean:
+	rm -rf $(BUILDDIR)
+	rm -rf $(DEPSDIR)
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 56517d3..5920782 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -92,6 +92,13 @@ ifneq ($(objtree),)
 #$(info Determined 'objtree' to be $(objtree))
 endif
 
+ifeq ($(findstring -static,${LDFLAGS}),-static)
+  ifneq ($(wildcard deps-$(ARCH)/*),)
+    LDFLAGS += -L $(PWD)/deps-$(ARCH)/lib
+    EXTRA_CFLAGS += -isystem $(PWD)/deps-$(ARCH)/include
+  endif
+endif
+
 ifneq ($(OUTPUT),)
 #$(info Determined 'OUTPUT' to be $(OUTPUT))
 # Adding $(OUTPUT) as a directory to look for source files,
-- 
1.7.10.4