Hi all,
I've been trying to build DirectFB, and I think that I've narrowed down a
bug in the build process to what might be a confusing make or libtool
behavior. I've been cross-compiling using --sysroot for gcc so that
everything will link against a custom set of libraries that I've built.
Here's my full configure line (the important part is to note that
--sysroot=/home/ersin/vorpo/toolchain):
PKG_CONFIG_LIBDIR=/home/ersin/vorpo/toolchain/usr/lib/pkgconfig
F77="i386-linux-gfortran --sysroot=/home/ersin/vorpo/toolchain" FFLAGS="-Os"
CCAS="i386-linux-as" CXX="i386-linux-g++
--sysroot=/home/ersin/vorpo/toolchain" CXXFLAGS="-Os" CC="i386-linux-gcc
--sysroot=/home/ersin/vorpo/toolchain" CFLAGS="-Os" ./configure
--prefix=/usr --host=i386-linux --disable-osx --disable-x11
--disable-debug-support --disable-voodoo --disable-unique --enable-mmx
--enable-sse --enable-fbdev --enable-sysfs --enable-jpeg --enable-png
--enable-gif --enable-freetype --disable-video4linux --disable-video4linux2
--disable-vnc --disable-sdl --with-gfxdrivers=none
--with-inputdrivers=joystick,keyboard,linuxinput,ps2mouse,serialmouse
--with-software --without-smooth-scaling --enable-static
DirectFB chokes, however, when it starts to build a certain tool,
directfb-csource, that requires libpng. Here's the relevant part from the
build:
[er...@basmati DirectFB-1.4.3]$ make directfb-csource
make -C tools directfb-csource
make[1]: Entering directory `/home/ersin/vorpo/build/DirectFB-1.4.3/tools'
i386-linux-gcc --sysroot=/home/ersin/vorpo/toolchain -DHAVE_CONFIG_H -I.
-I.. -I../lib -I../include -I../include -I../lib -I../src
-DDATADIR=\"/usr/share/directfb-1.4.3\" -D_REENTRANT
-I/usr/include/freetype2 -O3 -ffast-math -pipe -Os -D_GNU_SOURCE
-Werror-implicit-function-declaration -MT directfb-csource.o -MD -MP -MF
.deps/directfb-csource.Tpo -c -o directfb-csource.o
directfb-csource.c
mv -f .deps/directfb-csource.Tpo
.deps/directfb-csource.Po
/bin/sh ../libtool --tag=CC --mode=link i386-linux-gcc
--sysroot=/home/ersin/vorpo/toolchain -I/usr/include/freetype2 -O3
-ffast-math -pipe -Os -D_GNU_SOURCE -Werror-implicit-function-declaration
-o directfb-csource directfb-csource.o -lpng12 -ldl
-lpthread
mkdir
.libs
i386-linux-gcc --sysroot=/home/ersin/vorpo/toolchain
-I/usr/include/freetype2 -O3 -ffast-math -pipe -Os -D_GNU_SOURCE
-Werror-implicit-function-declaration -o directfb-csource
directfb-csource.o /usr/lib/libpng12.so -ldl -lpthread
/home/ersin/vorpo/build/buildroot-2010.02/output/staging/usr/bin-ccache/../lib/gcc/i386-linux-uclibc/4.3.4/../../../../i386-linux-uclibc/bin/ld:
warning: libm.so.6, needed by /usr/lib/libpng12.so, not found (try using
-rpath or -rpath-link)
/home/ersin/vorpo/build/buildroot-2010.02/output/staging/usr/bin-ccache/../lib/gcc/i386-linux-uclibc/4.3.4/../../../../i386-linux-uclibc/bin/ld:
warning: libc.so.6, needed by /usr/lib/libpng12.so, not found (try using
-rpath or -rpath-link)
/usr/lib/libpng12.so: undefined reference to `f...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `str...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `_set...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `__memcpy_...@glibc_2.3.4'
/usr/lib/libpng12.so: undefined reference to `mem...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `fr...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `__fprintf_...@glibc_2.3.4'
/usr/lib/libpng12.so: undefined reference to `ffl...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `gmt...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `mem...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `mem...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `mal...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `long...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `__snprintf_...@glibc_2.3.4'
/usr/lib/libpng12.so: undefined reference to `__stack_chk_f...@glibc_2.4'
/usr/lib/libpng12.so: undefined reference to `str...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `std...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `fwr...@glibc_2.0'
/usr/lib/libpng12.so: undefined reference to `ab...@glibc_2.0'
collect2: ld returned 1 exit status
make[1]: *** [directfb-csource] Error 1
make[1]: Leaving directory `/home/ersin/vorpo/build/DirectFB-1.4.3/tools'
make: *** [directfb-csource] Error 2
[er...@basmati DirectFB-1.4.3]$
Something strange is going on here. Look at the lines after "mkdir .libs"
carefully:
i386-linux-gcc --sysroot=/home/ersin/vorpo/toolchain
-I/usr/include/freetype2 -O3 -ffast-math -pipe -Os -D_GNU_SOURCE
-Werror-implicit-function-declaration -o directfb-csource
directfb-csource.o /usr/lib/libpng12.so -ldl -lpthread
/home/ersin/vorpo/build/buildroot-2010.02/output/staging/usr/bin-ccache/../lib/gcc/i386-linux-uclibc/4.3.4/../../../../i386-linux-uclibc/bin/ld:
warning: libm.so.6, needed by /usr/lib/libpng12.so, not found (try using
-rpath or -rpath-link)
Here's where my limited knowledge of make starts to hinder me and where I
need help. The build is trying to link explicitly against
"/usr/lib/libpng12.so", which is the libpng path on my host machine, when it
shouldn't be using an absolute path at all. I narrowed it down, and that
compile line above seems to be related to the following in tools/Makefile:
directfb-csource$(EXEEXT): $(directfb_csource_OBJECTS)
$(directfb_csource_DEPENDENCIES)
@rm -f directfb-csource$(EXEEXT)
$(LINK) $(directfb_csource_OBJECTS) $(directfb_csource_LDADD)
$(LIBS)
$(LINK) expands to:
LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
$(LDFLAGS) -o $@
which is clearly not gcc, but this line was the only place that I could find
the pattern "$(directfb_csource_OBJECTS) $(directfb_csource_LDADD) $(LIBS)",
which almost expands to the problematic part of the build ("i386-linux-gcc
............... directfb-csource directfb-csource.o /usr/lib/libpng12.so
-ldl -lpthread"), except for two things:
directfb_csource_LDADD = $(LIBPNG_LIBS)
and
LIBPNG_LIBS = -lpng12
So what seems to be happening is that make runs ../libtool, which happens
right before the line where gcc chokes, and somewhere between then and when
the build tries to link against my system libraries, direct_csource_LDADD
somehow turns from "-lpng12" to "/usr/lib/libpng12.so", and then that
pattern gets concatenated to the end of the compile line. I can override
this behavior by adding
LIBPNG_LIBS="/home/ersin/vorpo/toolchain/usr/lib/libpng12.so -lpng12" to my
configure line, but this is ugly and doesn't work properly anyhow
("/usr/lib/libpng12.so" is still being linked against and the build spits
out a warning, but I guess since it finds the proper symbols from
"/home/ersin/vorpo/toolchain/usr/lib/libpng12.so" it doesn't complain). Why
do these substitutions occur and how can I stop them? If I can't stop them,
can I somehow add my sysroot directory to the beginning?
Thanks,
Ersin
--
What Digital Revolution? -- www.whatdigitalrevolution.com
Thinking critically about digital worlds.
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