Hi Boqun, I'm trying to build librseq at:
https://git.kernel.org/pub/scm/libs/librseq/librseq.git on powerpc, and I get these errors when building the rseq basic test mirrored from the kernel selftests code: /tmp/ccieEWxU.s: Assembler messages: /tmp/ccieEWxU.s:118: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:118: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:121: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:121: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:626: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:626: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:629: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:629: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:735: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:735: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:738: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:738: Error: junk at end of line: `,8' /tmp/ccieEWxU.s:741: Error: syntax error; found `,', expected `(' /tmp/ccieEWxU.s:741: Error: junk at end of line: `,8' Makefile:581: recipe for target 'basic_percpu_ops_test.o' failed I am using this compiler: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12) Target: powerpc-linux-gnu So far, I got things to build by changing "m" operands to "Q" operands. Based on https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints it seems that "Q" means "A memory operand addressed by just a base register." I suspect that lwz and stw don't expect some kind of immediate offset which can be kept with "m", and "Q" fixes this. Is that the right fix ? And should we change all operands passed to lwz and stw to a "Q" operand ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
