buildroot

Improve bzip2 build system

​

This patch makes a number of improvements to the bzip2 build system:

​

 * Remove the BIGFILE variable that was used to force largefile

   support. Now, the user of the Makefile is supposed to pass

   -D_FILE_OFFSET_BITS=64 when largefile support is desired.

​

 * Use override CFLAGS += so that additional CFLAGS can be passed on

   the command line.

​

 * Removed "forced" CFLAGS -O2, -g and -Winline. We don't want them by

   default, and want the build system to use its own ones.

​

 * When creating the symbolic links bzegrep, bzfgrep, bzless and

   bzcmp, don't link them to an absolute path, or they'll point to

   some path on the build machine.

​

 * Provide an install target for the shared library, which creates the

   appropriate symbolic links.

​

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

​

Index: b/Makefile

===================================================================

--- a/Makefile

+++ b/Makefile

@@ -20,8 +20,7 @@

 RANLIB=ranlib

 LDFLAGS=

-BIGFILES=-D_FILE_OFFSET_BITS=64

-CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)

+override CFLAGS += -Wall

 # Where you want it installed when you do 'make install'

 PREFIX=/usr/local

@@ -90,14 +89,14 @@

    cp -f libbz2.a $(PREFIX)/lib

    chmod a+r $(PREFIX)/lib/libbz2.a

    cp -f bzgrep $(PREFIX)/bin/bzgrep

-   ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzegrep

-   ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzfgrep

+   ln -s -f bzgrep $(PREFIX)/bin/bzegrep

+   ln -s -f bzgrep $(PREFIX)/bin/bzfgrep

    chmod a+x $(PREFIX)/bin/bzgrep

    cp -f bzmore $(PREFIX)/bin/bzmore

-   ln -s -f $(PREFIX)/bin/bzmore $(PREFIX)/bin/bzless

+   ln -s -f bzmore $(PREFIX)/bin/bzless

    chmod a+x $(PREFIX)/bin/bzmore

    cp -f bzdiff $(PREFIX)/bin/bzdiff

-   ln -s -f $(PREFIX)/bin/bzdiff $(PREFIX)/bin/bzcmp

+   ln -s -f bzdiff $(PREFIX)/bin/bzcmp

    chmod a+x $(PREFIX)/bin/bzdiff

    cp -f bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1

    chmod a+r $(PREFIX)/man/man1/bzgrep.1

Index: b/Makefile-libbz2_so

===================================================================

--- a/Makefile-libbz2_so

+++ b/Makefile-libbz2_so

@@ -23,8 +23,7 @@

 SHELL=/bin/sh