Messages in this thread | | | Date | Fri, 14 Mar 2008 18:00:04 +0100 | From | Carlo Wood <> | Subject | Re: [ext3grep] compile error |
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On Fri, Mar 14, 2008 at 08:56:40PM +0530, vishwanathtk@gmail.com wrote: > Hi, > > I am getting some compile time error: > > make[2]: Entering directory `/usr/src/redhat/BUILD/ext3grep-0.0.1/src' > g++ -Iempty.pch.h -DHAVE_CONFIG_H -I. -I.. -g -O2 -include pch.h \ > -c -o pch.h.gch/68b329da9893e34099c7d8ad5cb9c940 ./pch-source.h > /usr/include/linux/ext3_fs.h: In function 'unsigned int ext3_rec_len_from_disk (__le16)': > /usr/include/linux/ext3_fs.h:615: error: 'le16_to_cpu' was not declared in this scope
This seem a bug in linux/ext3_fs.h. I was able to reproduce this on debian sid, meaning kernel (headers) 2.6.24.
linux/ext3_fs.h defines functions in user space (with __KERNEL__ UNdefined) that use le16_to_cpu et al, but those are not defined without __KERNEL__ being defined. Moreover, the header that defined them is no longer available in userspace.
This means that we'd need an ugly work around: you'll have to define all those macro's yourself before including linux/ext3_fs.h. The best thing to do is to add a test to configure.ac for this, and when needed define the macro's in sys.h.
linux/ext3_fs.h is now also using/calling a macro called BUG(), wtf?
Is there a kernel hacker on the list who can tell me what to do? Is is not allowed to include <linux/ext3_fs.h> (and <linux/jbd.h>) in a user application? How is one supposed to use these header files?
I can write workarounds without problems, but that might break every other kernel version if things like this are being done.
I'm also getting:
/usr/include/linux/jbd.h:63: error: 'get_order' was not declared in this scope /usr/include/linux/jbd.h:63: error: '__get_free_pages' was not declared in this scope /usr/include/linux/jbd.h:68: error: 'free_pages' was not declared in this scope
-- Carlo Wood <carlo@alinoe.com>
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