Re: libtool/make and sysroot
Hello Ersin, thanks for providing a nice and detailed analysis! * Ersin Akinci wrote on Sun, Mar 21, 2010 at 06:29:14PM CET: 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. libtool doesn't really cope well with --sysroot yet, sorry you had to learn the hard way. You can probably work around it by temporarily moving /usr/lib/libpng12.la out of the way, if that file exists. If it doesn't exist, then another workaround to try is to add -L/home/ersin/vorpo/toolchain/usr/lib to LDFLAGS at some point, but of course that means that installed .la files will have wrong paths in them, and possibly installed programs and libraries could have a wrong run path embedded in them. Hope that helps. Cheers, Ralf ___ http://lists.gnu.org/mailman/listinfo/libtool
Re: libtool/make and sysroot
On Sun, 21 Mar 2010, Ersin Akinci wrote: 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): It seems that the problem is that libtool does not support --sysroot. Libtool searches for libpng12.so using the normal compiler search path. But first it will search for a libpng12.la file and use the library information it finds there. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer,http://www.GraphicsMagick.org/___ http://lists.gnu.org/mailman/listinfo/libtool
Re: libtool/make and sysroot
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___ http://lists.gnu.org/mailman/listinfo/libtool
Re: libtool/make and sysroot
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.comwrote: 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. ___ http://lists.gnu.org/mailman/listinfo/libtool
