Thank you to everyone who jumped in with a reply! Yes, I can see now that sysroot and libtool have some problems together.
Sure enough, the problem was in /home/ersin/vorpo/toolchain/usr/lib/ libpng12.la. Once I changed "libdir='/usr/lib'" to "libdir='/home/ersin/vorpo/toolchain/usr/lib'" the build linked normally. But isn't that dangerous? Here's what the compile line has turned into: 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 /home/ersin/vorpo/toolchain/usr/lib/libpng12.so -ldl -lpthread -Wl,--rpath -Wl,/home/ersin/vorpo/toolchain/usr/lib -Wl,--rpath -Wl,/home/ersin/vorpo/toolchain/usr/lib Is that setting the rpath to my sysroot, or is the --rpath switch spurious? If it is setting rpath, is there a way to change libpng12.la so that libtool gets the right directory but sets a different rpath? Are there any other side effects of changing .la files? Thanks, Ersin On Sun, Mar 21, 2010 at 2:56 PM, Daniel Herring <dherr...@tentpost.com>wrote: > On Sun, 21 Mar 2010, Ersin Akinci wrote: > >> 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): >> > ... > > 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-lin >> ux-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-lin >> ux-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' >> > ... > > 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: >> > > It looks like libtool is reading the wrong .la file and changing paths on > you. The output of `libtool --version` might be useful. For proper > debugging, > > # cd /home/ersin/vorpo/build/DirectFB-1.4.3/tools > # /bin/sh ../libtool --debug --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 > > libtool-debug.txt > > Search this for the first occurrance of /usr/lib/libpng12.so and then look > backwards for a .la. Or just grep the /usr/lib/libpng12.la text file. If > you find this path in an offending .la file, rename that file to .la-bak and > try recompiling. > > These .la files can be absolutely essential in some situations, and a > complete nightmare in others. > > The .la file problem is my first guess. If its not the issue, then upload > the libtool-debug.txt file to a paste bin somewhere and submit a link to > this list. > > - Daniel -- What Digital Revolution? -- www.whatdigitalrevolution.com Thinking critically about digital worlds.
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