Hi Tom! On Tue, 26 Feb 2019 12:28:34 +0100, Tom de Vries <tdevr...@suse.de> wrote: > On 26-02-19 10:40, Thomas Schwinge wrote: > > On Mon, 25 Feb 2019 18:11:23 +0100, Tom de Vries <tdevr...@suse.de> wrote: > >> On 25-02-19 11:48, Thomas Schwinge wrote: > >>> On Fri, 8 Feb 2019 10:42:24 +0100, Tom de Vries <tdevr...@suse.de> wrote: > >>>> Add libbacktrace test-case using -flto. > >>> > >>> I'm seeing this one fail is some configurations, but only in the > >>> 'build-gcc/libbacktrace/btest_lto.log' variant: > > > >> Meaning, compiling libbacktrace using the host compiler, so it would be > >> useful to known which compiler that is. > >> > >> [ I've tried a gcc-4.8 and gcc-6 and gcc-7 as host compiler, and a > >> couple of CFLAGS settings (-O2, -O3) to reproduce this, but didn't manage. > >> ] > > > > Years old: > > > > $ gcc --version > > gcc (Sourcery CodeBench 2014.05-45) 4.8.3 20140320 (prerelease) > > [...] > > $ ld --version > > GNU ld (Sourcery CodeBench 2014.05-45) 2.24.51.20140217 > > [...] > > > > (It'll be fine for me if you just declare that unsupported.) > > I see. The 4.8 I tried is a 4.8.5. > > >>> test5: unexpected syminfo name got global.2537 expected global > >>> PASS: backtrace_full noinline > >>> PASS: backtrace_full inline > >>> PASS: backtrace_simple noinline > >>> PASS: backtrace_simple inline > >>> FAIL: backtrace_syminfo variable > >>> FAIL btest_lto (exit status: 1) > >>> > >>> I haven't looked yet which details about these GCC build configurations > >>> might be different/important; maybe you've got an idea already? > > > > I can reproduce this with '-O0' ("unexpected syminfo name got global.2528 > > expected global", in that case). With '-O0 -fdump-tree-all > > -fdump-ipa-all -save-temps', the 'global.2528' name appears only in > > 'btest_lto.ltrans0.000i.cgraph', and 'btest_lto.ltrans0.s': > > > > ./btest_lto.ltrans0.000i.cgraph: References: global.2528/12 > > (addr)state.2526/56 (read)callback_three.2389/64 > > (addr)error_callback_three.2384/65 (addr)stderr/20 (read)stderr/20 > > (read)stderr/20 (read)global.2528/12 (addr)global.2528/12 (addr)stderr/20 > > (read)stderr/20 (read)failures.2527/57 (read)failures.2527/57 > > (write)failures.2527/57 (read) > > ./btest_lto.ltrans0.000i.cgraph:global.2528/12 (global) @0xf7454118 > > ./btest_lto.ltrans0.000i.cgraph:global.2528/12 (global) @0xf7454118 > > ./btest_lto.ltrans0.000i.cgraph: References: global.2528/12 > > (addr)state.2526/56 (read)callback_three.2389/64 > > (addr)error_callback_three.2384/65 (addr)stderr/20 (read)stderr/20 > > (read)stderr/20 (read)global.2528/12 (addr)global.2528/12 (addr)stderr/20 > > (read)stderr/20 (read)failures.2527/57 (read)failures.2527/57 > > (write)failures.2527/57 (read) > > ./btest_lto.ltrans0.000i.cgraph:global.2528/12 (global) @0xf7454118 > > ./btest_lto.ltrans0.000i.cgraph: References: global.2528/12 > > (addr)state.2526/56 (read)callback_three.2389/64 > > (addr)error_callback_three.2384/65 (addr)stderr/20 (read)stderr/20 > > (read)stderr/20 (read)global.2528/12 (addr)global.2528/12 (addr)stderr/20 > > (read)stderr/20 (read)failures.2527/57 (read)failures.2527/57 > > (write)failures.2527/57 (read) > > ./btest_lto.ltrans0.s: .type global.2528, @object > > ./btest_lto.ltrans0.s: .size global.2528, 4 > > ./btest_lto.ltrans0.s:global.2528: > > ./btest_lto.ltrans0.s: movq $global.2528, -8(%rbp) #, addr > > ./btest_lto.ltrans0.s: movl $global.2528, %eax #, global.22 > > ./btest_lto.ltrans0.s: movl $global.2528, %ecx #, global.23 > > ./btest_lto.ltrans0.s: .quad global.2528
With '-fdump-rtl-all' added, I see it appear in 'btest_lto.ltrans0.166r.expand': ./btest_lto.ltrans0.166r.expand: (symbol_ref:DI ("global.2528") [flags 0x2] <var_decl 0xf7400170 global>)) [...]/libbacktrace/btest.c:399 -1 ./btest_lto.ltrans0.166r.expand: (symbol_ref:DI ("global.2528") [flags 0x2] <var_decl 0xf7400170 global>)) [...]/libbacktrace/btest.c:433 -1 ./btest_lto.ltrans0.166r.expand: (symbol_ref:DI ("global.2528") [flags 0x2] <var_decl 0xf7400170 global>)) [...]/libbacktrace/btest.c:435 -1 > How about: > ... > - int global; > + static int global; > ... > > Does that fix the failure? No, that gets us "unexpected syminfo name got global.2479.2528 expected global". ;-\ Grüße Thomas