[LU-13274] Building againt lustreapi using -std=c99

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0, Lustre 2.12.5
• Labels: llnl
• Assignee: James A Simmons
• Reporter: Gian-Carlo Defazio

Description

An application that uses the compiler flag -std=c99 wants to link against lustreapi. This was possible in version 2.8. Current versions of lustreapi use the linux kernel macro __ALIGN_KERNEL() which contains the gnuism typeof, as opposed the ISO version __typeof__. For older kernels that don't define ___ALIGN_KERNEL(), Lustre conditionally defines it.

The "simplest" fix would be for the application to add -Dtypeof=__typeof__, however, this would require figuring out where in the build system to add such a flag. The other option would be to change Lustre and redefine typeof to __typeof__ in the source code of the files that use __ALIGN_KERNEL() or maybe somewhere in the Lustre build system.

Are there assumptions about the C version that is used by applications that use lustreapi?

 

 

 

Issue Links

• is related to: LU-13315 RHEL8 build failed with some options
• is related to: LU-13525 struct sepol_downcall_data is badly formed
• is related to: LU-12511 Prepare lustre for adoption into the linux kernel