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Bug 377949 - sys-devel/clang-2.9 only checks for certain full GCC versions (and does not depend on them properly)
Summary: sys-devel/clang-2.9 only checks for certain full GCC versions (and does not d...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Development (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Bernard Cafarelli
Depends on:
Reported: 2011-08-06 08:08 UTC by Amir Aupov
Modified: 2012-10-02 22:36 UTC (History)
5 users (show)

See Also:
Package list:
Runtime testing required: ---

patch from Sebastian Andrzej Siewior <> (clang-2.9-gcc-4.6.patch,727 bytes, patch)
2011-08-06 20:30 UTC, Amir Aupov
Details | Diff
Updates the GCC version list for all GCC releases since Clang 2.9 was tagged as of August 8, 2011 (clang-2.9-gcc-version.patch,724 bytes, patch)
2011-08-10 19:20 UTC, Richard
Details | Diff
modifed patch to fix clang's search path (clang-2.9-linker_fixer.patch,746 bytes, patch)
2011-08-14 03:50 UTC, Josh
Details | Diff

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Description Amir Aupov 2011-08-06 08:08:07 UTC
Clang 2.9 fails to link the executable. For example:

fads@extensa /tmp $ cat main.c
#include <stdio.h>

int main (){
	printf("Hello, bugzilla!\n");
	return 0;
fads@extensa /tmp $ clang main.c -o main -v
clang version 2.9 (tags/RELEASE_29/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
 "/usr/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name main.c -mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version 2.21.1 -momit-leaf-frame-pointer -v -resource-dir /usr/bin/../lib/clang/2.9 -ferror-limit 19 -fmessage-length 170 -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/cc-dkk4Zj.o -x c main.c
clang -cc1 version 2.9 based upon llvm 2.9 hosted on x86_64-pc-linux-gnu
ignoring nonexistent directory "/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
End of search list.
 "/usr/bin/ld" --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ -o main /usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o crtbegin.o -L -L/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/../../.. /tmp/cc-dkk4Zj.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed crtend.o /usr/lib/../lib64/crtn.o
/usr/bin/ld: cannot find crtbegin.o: No such file or directory
/usr/bin/ld: cannot find -lgcc
/usr/bin/ld: cannot find -lgcc_s
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Reproducible: Always

The same bug on debians bugzilla
Comment 1 Amir Aupov 2011-08-06 08:10:13 UTC
The same bug on official llvm bugzilla
Comment 2 Amir Aupov 2011-08-06 20:30:39 UTC
Created attachment 282355 [details, diff]
patch from Sebastian Andrzej Siewior <>

Clang works as expected after applying this patch, and modifying clang-2.9.ebuild:

src_prepare() {
        mv "${WORKDIR}"/clang-${PV} "${S}"/tools/clang || die "clang source directory not found"

+        # Fix bug #377949, troubles with GCC 4.6
+        epatch "${FILESDIR}"/${PN}-2.9-gcc-4.6.patch
Comment 3 Benedikt Reinartz 2011-08-08 07:36:59 UTC
While you're at it you can also at "4.5.3" to this list. Man, this is broken …
Comment 4 Richard 2011-08-10 19:20:12 UTC
Created attachment 282867 [details, diff]
Updates the GCC version list for all GCC releases since Clang 2.9 was tagged as of August 8, 2011

Here is a patch that covers GCC 4.4.6, GCC 4.5.3, GCC 4.6.0, GCC 4.6.1 and GCC 4.6.2.

I can verify that this fixes Clang linker issues with GCC 4.4.6. I have no reason to think that it won't fix equivalent issues with GCC 4.5.3, GCC 4.6.0, GCC 4.6.1 and GCC 4.6.2.
Comment 5 Richard 2011-08-10 19:24:00 UTC
Other people can/should test this, but I think this patch is ready for inclusion into portage. It isn't a big change and anyone with GCC 4.5.3 could verify that this patch fixes the problem. I don't have commit privileges, so I can't commit it myself.

It only takes 3 commands to apply this patch to an affected system:

ebuild $(equery which sys-devel/clang-2.9) unpack
wget -O - "" | patch -d/var/tmp/portage/sys-devel/clang-2.9/work -p1
ebuild $(equery which sys-devel/clang-2.9) merge
Comment 6 Josh 2011-08-14 03:50:29 UTC
Created attachment 283263 [details, diff]
modifed patch to fix clang's search path

I had the same crtbegin.o error in clang and I have gcc version 4.5.3. After applying the patch, clang now works correctly. The patch didn't seem to match the clang directory structure I saw however, so I modified it to match; the modifed patch is attached.
Comment 7 Diego Elio Pettenò (RETIRED) gentoo-dev 2011-08-16 09:33:47 UTC
Thanks guys, this is now fixed in 2.9-r1.
Let's hope upstream will fix this properly at some point.
Comment 8 Alessandro Di Federico 2012-10-02 22:36:25 UTC
GCC 4.5.4 is unmasked on x64, maybe we should add it to the list. I had to change the patch manually.