[bug #34544] glibc related compilation failure with Clang and the non-fragile ABI

[Quentin Mathé]

URL:
  <http://savannah.gnu.org/bugs/?34544>

                 Summary: glibc related compilation failure with Clang and the
non-fragile ABI
                 Project: GNUstep
            Submitted by: qmathe
            Submitted on: Fri 14 Oct 2011 08:47:48 AM GMT
                Category: Base/Foundation
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Hi,

Ubuntu 10.4 x86-32
GNUstep core svn r33979
Clang svn r138561

When GNUstep Make is configured with CC=clang and
--enable-objc-nonfragile-abi, I'm unable to compile Base, an error is reported
every time unistd.h is included as shown below. Without passing
--enable-objc-nonfragile-abi to GNUstep Make, Base compiles just fine.

This seems to be due to a glibc bug described here (still unsolved
apparently): http://sources.redhat.com/bugzilla/show_bug.cgi?id=11157
At the end of the bug report, a workaround is suggested, it does work fine but
changing every files where unistd.h is included looks like a poor solution.

clang NSStream.m -c \
          -MMD -MP -Wall -Wdeclaration-after-statement -DGNUSTEP
-DGNUSTEP_BASE_LIBRARY=1 -DGNU_GUI_LIBRARY=1 -DGNU_RUNTIME=1
-DGNUSTEP_BASE_LIBRARY=1 -fno-strict-aliasing -fobjc-nonfragile-abi
-D_NONFRAGILE_ABI -fPIC -DDEBUG -fno-omit-frame-pointer -Wall -DGSWARN
-DGSDIAGNOSE -Wno-import -g -fgnu-runtime -fobjc-nonfragile-abi -fgnu-runtime
-fconstant-string-class=NSConstantString -I../. -I../../Headers -I.
-I/System/Library/Headers -I/Local/Library/Headers -I/Local/Library/Headers
-I/System/Library/Headers -I/usr/include/libxml2
-I/home/qmathe/GNUstep/Library/Headers -I/Local/Library/Headers
-I/System/Library/Headers \
           -o obj/unix.obj/NSStream.m.o
In file included from NSStream.m:27:
/usr/include/unistd.h:1128:35: error: __block attribute not allowed, only
      allowed on local variables
extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));

Thanks,
Quentin.





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