Hi, I'm in the process of building our kernel with Intels C Compiler (icc). So far we are able to build a working UP and SMP kernel (not completely automated). Most of it works just fine (NFS-client is known to not work).
At the moment I discussing an issue with Intel regarding 0-sized arrays. gcc seems to be violating the standard and produces code with an array size of "0", whereas icc produces code where an 0-sized array has the size "1". This results in different nm output of genassym.o: gcc generated: ---snip--- 00000000 C BC32SELsign 00000050 C BC32SELw0 00000000 C BC32SELw1 00000000 C BC32SELw2 00000000 C BC32SELw3 ---snip--- icc generated: ---snip--- 00000001 C BC32SELsign 00000050 C BC32SELw0 00000001 C BC32SELw1 00000001 C BC32SELw2 00000001 C BC32SELw3 ---snip--- Thus the output of genassym.sh with a icc generated genassym.o is wrong: ---snip--- #define BC32SEL -0x1000100010050 #define BI_ENDCOMMON -0x100010001000c #define BI_ESYMTAB -0x1000100010044 #define BI_KERNELNAME -0x1000100010004 #define BI_KERNEND -0x1000100010048 #define BI_NFS_DISKLESS -0x1000100010008 #define BI_SIZE -0x1000100010030 ---snip--- With a gcc generated genassym.o it looks like: ---snip--- #define BC32SEL 0x50 #define BI_ENDCOMMON 0xc #define BI_ESYMTAB 0x44 #define BI_KERNELNAME 0x4 #define BI_KERNEND 0x48 #define BI_NFS_DISKLESS 0x8 #define BI_SIZE 0x30 ---snip--- At least the generated defines are used in locore.s, but is this the only consumer of this "feature"? What I need to know is: - Do we really depend on 0-sized arrays in the code or is it just a genassym.sh issue? - If we depend on it: how hard would it be to rewrite it to not depend on 0-sized arrays (and does someone volunteer to rewrite it)? It would be nice if someone could point me to the source if it isn't an easy task, my contact @Intel is willing to convince the developers to change icc, but he has to "present a persuasive argument to development to pursue a solution". - If it is a genassym.sh issue: would someone with enough glue please provide me with a patch for genassym.sh which either uses a switch to understand the icc generated file or is able to detect it on it's own (I'm able to provide the output of nm and/or the object file)? Or at least describes what needs to be done, so I can try do do it myself after refreshing my awk knowledge? Bye, Alexander. -- Failure is not an option. It comes bundled with your Microsoft product. http://www.Leidinger.net Alexander @ Leidinger.net GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7 _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
