[gdb/testsuite] Drop -nostdlib in gdb.dwarf2/typeddwarf.exp
As reported in PR testsuite/30633, when running test-case gdb.dwarf2/typeddwarf.exp with target board native-gdbserver on Ubuntu 22.04.2, we run into: ... (gdb) continue^M Continuing.^M ^M Program received signal SIGSEGV, Segmentation fault.^M 0x0000000000000001 in ?? ()^M (gdb) FAIL: gdb.dwarf2/typeddwarf.exp: runto: run to main ... We run into the FAIL as follows: - due to using gdbserver, we attach at the point of the first instruction, in _start - we then set a breakpoint at main - the test-case is a .s file, that has main renamed to _start in the assembly, but not in the debuginfo - setting a breakpoint at main sets the breakpoint at the same instruction we're currently stopped at - continue doesn't hit the breakpoint, and we return out of _start, which causes a sigsegv Note that this is for the amd64 case (using gdb.dwarf2/typeddwarf-amd64.S). For the i386 case (using gdb.dwarf2/typeddwarf.S), setting a breakpoint in main sets it one insn after function entry, and consequently the problem does not occur. The FAIL is a regression since commit 90cce6c0551 ("[gdb/testsuite] Add nopie in a few test-cases"). Without nopie the executable is PIE, with nopie it's static instead. In the PIE case, we attach at the point of _start in the dynamic linker, and consequently we do not skip the breakpoint in main, and also don't run into the FAIL. Fix this by: - removing the -nostdlib setting, and - renaming _start to main in both .S files. The change to use -nostdlib and rename main to _start was originally added in commit 6edba76fe8b (submitted here: https://sourceware.org/pipermail/gdb-patches/2011-May/082657.html ) , I assume to fix the problem now fixed by using nopie. Tested on x86_64-linux. Reported-By: Simon Marchi <simon.marchi@efficios.com> Tested-By: Simon Marchi <simon.marchi@efficios.com> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30633
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@ -116,9 +116,9 @@ f4:
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.cfi_endproc
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.LFE3:
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.size f4, .-f4
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.globl _start
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.type _start, @function
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_start:
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.globl main
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.type main, @function
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main:
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.LFB4:
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.loc 1 87 0
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.cfi_startproc
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@ -170,7 +170,7 @@ _start:
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ret
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.cfi_endproc
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.LFE4:
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.size _start, .-_start
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.size main, .-main
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.comm vv,4,4
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.section .rodata.cst8,"aM",@progbits,8
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.align 8
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@ -212,9 +212,9 @@ f4:
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.size f4, .-f4
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.section .text.startup,"ax",@progbits
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.p2align 4,,15
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.globl _start
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.type _start, @function
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_start:
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.globl main
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.type main, @function
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main:
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.LFB4:
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# typeddwarf.c:87
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.LM37:
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@ -314,7 +314,7 @@ _start:
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# SUCC: EXIT [100.0%]
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ret
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.LFE4:
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.size _start, .-_start
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.size main, .-main
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.comm vv,4,4
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.section .rodata.cst4,"aM",@progbits,4
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.align 4
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@ -31,7 +31,6 @@ if { [is_x86_like_target] } {
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set opts {}
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lappend opts nodebug
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lappend opts additional_flags=-nostdlib
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lappend opts nopie
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if { [prepare_for_testing "failed to prepare" "${test}" ${sfile} $opts] } {
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