This is the last patch in v3 of patchest Ive sent previously: v2: https://lore.kernel.org/lkml/?q=Cromie+v2+00%2F19+2020-12-25+-Re It isolates my only issue now, Id appreciate advice, and dont want to distract you with the 18 previous commits. Im trying to use ? : inside a KEEP(*(expression)) to only include A_header when A has content. IE: KEEP(*( A ? A_header : )) It fails with inscrutable linker error. GEN modules.builtin LD .tmp_vmlinux.kallsyms1 ld:./arch/x86/kernel/vmlinux.lds:46: syntax error Is this possible by other modes of expression ? I tried inserting {} 1st, that failed, appearing to foreclose any foreach-like construct. I also tried () around each term, and a preceding, embedded "_loc=.;" statement to test the parser. I didnt try doing this with 2 separate KEEPs; while it would be simple, it defeats the adjacency guaranteed by *(.text .rdata), which is the point of this. If this were to be possible, it opens up interesting options to statically construct table headers, and possibly even tree structures in the linker script. Id use it to add 1 header for each module, and strip a column out of the table. Ive pulled binutils to take a look at the source; having never done anything bison-ish, I anticipate a long study without some focused primer knowledge. Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx> --- include/asm-generic/vmlinux.lds.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 87868c5a980a..6198cc850f9b 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -329,10 +329,10 @@ #define DYNAMIC_DEBUG_DATA() \ . = ALIGN(8); \ __start___dyndbg_sites = .; \ - KEEP(*(__dyndbg_sites .gnu.linkonce.*.dyndbg_site)) \ + KEEP(*(__dyndbg_sites ? .gnu.linkonce.*.dyndbg_site : )) \ __stop___dyndbg_sites = .; \ __start___dyndbg = .; \ - KEEP(*(__dyndbg .gnu.linkonce.*.dyndbg)) \ + KEEP(*(__dyndbg ? .gnu.linkonce.*.dyndbg : )) \ __stop___dyndbg = .; #else #define DYNAMIC_DEBUG_DATA() -- 2.29.2
