Hello, On Wed, 19 Jul 2017 18:01:56 +0200, Denys Vlasenko wrote:
> > It builds only Busybox, so it's very quick to reach the build failure. > > This time, I got: > > > > libbb/lib.a(appletlib.o): In function `find_applet_by_name': > > appletlib.c:(.text.find_applet_by_name+0x14): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `applet_nameofs' defined in > > .rodata.applet_nameofs section in libbb/lib.a(appletlib.o) > > appletlib.c:(.text.find_applet_by_name+0x18): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `applet_names' defined in .rodata.applet_names > > section in libbb/lib.a(appletlib.o) > > libbb/lib.a(appletlib.o): In function `bb_show_usage': > > appletlib.c:(.text.bb_show_usage+0x10): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `applet_name' defined in COMMON section in > > libbb/lib.a(appletlib.o) > > appletlib.c:(.text.bb_show_usage+0x54): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `bb_banner' defined in .rodata.bb_banner > > section in libbb/lib.a(messages.o) > > libbb/lib.a(appletlib.o): In function `lbb_prepare': > > appletlib.c:(.text.lbb_prepare+0x18): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `bb_errno' defined in COMMON section in > > libbb/lib.a(ptr_to_globals.o) > > appletlib.c:(.text.lbb_prepare+0x20): relocation truncated to fit: > > R_SPARC_GOT13 against symbol `applet_name' defined in COMMON section in > > libbb/lib.a(appletlib.o) > > libbb/lib.a(appletlib.o): In function `run_applet_no_and_exit': > > appletlib.c:(.text.run_applet_no_and_exit+0x28): relocation truncated to > > fit: R_SPARC_GOT13 against symbol `xfunc_error_retval' defined in > > .data.xfunc_error_retval section in libbb/lib.a(default_error_retval.o) > > appletlib.c:(.text.run_applet_no_and_exit+0x38): relocation truncated to > > fit: R_SPARC_GOT13 against symbol `applet_name' defined in COMMON section > > in libbb/lib.a(appletlib.o) > > appletlib.c:(.text.run_applet_no_and_exit+0xb0): relocation truncated to > > fit: R_SPARC_GOT13 against symbol `applet_main' defined in > > .data.rel.ro.applet_main section in libbb/lib.a(appletlib.o) > > appletlib.c:(.text.run_applet_no_and_exit+0xcc): relocation truncated to > > fit: R_SPARC_GOT13 against symbol `applet_suid' defined in > > .rodata.applet_suid section in libbb/lib.a(appletlib.o) > > appletlib.c:(.text.run_applet_no_and_exit+0x11c): additional relocation > > overflows omitted from the output > > collect2: error: ld returned 1 exit status > > > > When I build with my patches (the build is successful), and then look > > at libbbusybox.so with readelf, the .got section is indeed very small, > > much smaller than the 8 KB limit detailed in gcc's documentation about > > -fpic vs. -fPIC: > > > > $ ./output/host/usr/bin/sparc-linux-readelf -a > > output/target/lib/libbusybox.so.1.26.2 | grep "\.got" > > [17] .got PROGBITS 000dc000 0cc000 00021c 04 WA 0 > > 0 4 > > > > So the size is only 0x21c. > > > > Any idea on how to investigate this further? > > I think what happens is compiler does not know where applet_names[] are, > assumes it's in another library and generates a reloc. > Then, the "short" fpic reloc does not work at link time. And so, from there? Is it a compiler bug? Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
