elfutils-devel January 2012

elfutils-devel@lists.fedorahosted.org

7 participants
3 discussions

release soonish
by Roland McGrath 24 Feb '12

24 Feb '12

Though overall activity has been fairly low since about last March (wonder why ;-), there has been more than enough change to warrant a release. In particular 0.152 doesn't build happily with the newest compilers. In the absence of strenuous and explained objection, I'm going to merge the robustify branch into the trunk. I've just completed -D/-U support in ar/ranlib and the --enable-deterministic-archvies configure option, for parity with current binutils. Mark is going to look into a new elflint-self regression on Fedora 17. Chances are that is a toolchain bug rather than something for us to fix. But it needs figured out before we consider a release. I don't know of anything else anyone intends to work on any time soon. If you have any plans, please post about them. Once Mark's investigation comes to a conclusion, I think we should do 0.153. Thanks, Roland

6 39

--gc-sections not working?
by Jaroslav Sýkora 16 Jan '12

16 Jan '12

Hello everybody! I am developing elf linker for the PicoBlaze CPU target using elfutils-0.152 (see work-in-progress patches in [1]). PicoBlaze is a primitive 8-bit RISC core for Xilinx FPGA. It has quite a small program memory - only 1024 instructions. Hence code size is of primary concern here. I've discovered that the option --gc-sections does not work as intended (see test examples in [2] using i386 target instead). I put each function in its own section (-ffunction-sections), but when a single function (section .text.foo) from the object file is included in the output, all the other sections (.text.bar) are included too. I also tried linking against an archive: in this case the situation improves as untouched object files in the archive are not linked in, but once a function is linked-in, all the other from the same object file are linked-in too. In [2] I tried it also with GNU binutils and it works fine. Some commands from [2] - maybe I am missing an option switch somewhere? gcc -Wall -O3 -ffunction-sections -m32 -c -o main.o ../src/main.c elfutils-ld -c elf32-i386.script --gc-sections -L. main.o -lmy -o fin-lib-gc.elf I very much need the feature to omit unused functions to minimize code size. Could someone help please? Bye, Jara [1] http://dl.dropbox.com/u/3124266/elfutils-0.152-pblaze-20120112.patch [2] http://dl.dropbox.com/u/3124266/elfutils-test.tar.gz -- Space--the final frontier!

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Test fails due to lost content of LD_LIBRARY_PATH
by Serge Pavlov 10 Jan '12

10 Jan '12

Hi all, Tests asm-tst4, asm-tst5 and asm-tst6 can fail if binaries produced by compiler require shared libraries which are not in system directories. For instance if the binaries are produced by development version of compiler. In such cases LD_LIBRARY_PATH should contain path to non-standard location of libraries, but in the aforementioned tests content of this variable is lost. The following patch can be used to solve the problem: diff --git a/tests/asm-tst4.c b/tests/asm-tst4.c index 54d054c..e6a6210 100644 --- a/tests/asm-tst4.c +++ b/tests/asm-tst4.c @@ -102,7 +102,8 @@ main (void) if (result == 0) result = WEXITSTATUS (system ("\ -env LD_LIBRARY_PATH=../libelf ../src/elflint -q asm-tst4-out.o")); +env LD_LIBRARY_PATH=../libelf${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH\ + ../src/elflint -q asm-tst4-out.o")); /* We don't need the file anymore. */ unlink (fname); diff --git a/tests/asm-tst5.c b/tests/asm-tst5.c index 2a8b3f0..f81272b 100644 --- a/tests/asm-tst5.c +++ b/tests/asm-tst5.c @@ -114,7 +114,8 @@ main (void) if (result == 0) result = WEXITSTATUS (system ("\ -env LD_LIBRARY_PATH=../libelf ../src/elflint -q asm-tst5-out.o")); +env LD_LIBRARY_PATH=../libelf${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH\ + ../src/elflint -q asm-tst5-out.o")); /* We don't need the file anymore. */ unlink (fname); diff --git a/tests/asm-tst6.c b/tests/asm-tst6.c index bd6a71d..a4f5ac8 100644 --- a/tests/asm-tst6.c +++ b/tests/asm-tst6.c @@ -148,7 +148,8 @@ main (void) if (result == 0) result = WEXITSTATUS (system ("\ -env LD_LIBRARY_PATH=../libelf ../src/elflint -q asm-tst6-out.o")); +env LD_LIBRARY_PATH=../libelf${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH\ + ../src/elflint -q asm-tst6-out.o")); /* We don't need the file anymore. */ unlink (fname); Thanks, --Serge

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elfutils-devel January 2012