[binutils-gdb] gdb/testsuite: fix dw2-entry-pc.exp with ASLR

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c0f7609cd19ca79c34a1b68550ceb79ff8189775

commit c0f7609cd19ca79c34a1b68550ceb79ff8189775
Author: Bratislav Filipovic <[email protected]>
Date:   Tue Apr 14 16:41:44 2026 +0000

    gdb/testsuite: fix dw2-entry-pc.exp with ASLR
    
    Following Simon Marchi's fix for dw2-empty-inline-ranges.exp [1], this
    test exhibits the same failure pattern when running in an environment
    where GDB can't disable address space randomization (such as in a
    container where that capability is removed) with a toolchain generating
    position-independent executables.
    
    The test does a first run to grab addresses of labels and function
    boundaries (foo_middle, foo_start, foo_end, and range labels).  It then
    crafts DWARF using these addresses across multiple test iterations.
    When the executable is PIE and ASLR is active, the addresses in each
    subsequent run don't match the addresses from the initial run.
    
    The failure manifests in the 'maint info blocks' output comparisons,
    where the expected addresses (from the first run) don't match the
    actual addresses in the test runs.
    
    The simplest fix, following Simon's approach, is to use "nopie" when
    building the binaries.  This doesn't affect the effectiveness of the
    test, which is exercising different ways DW_AT_entry_pc can be
    expressed in DWARF.
    
    Also, with a non-PIE executable, it is no longer necessary to run the
    inferior before grabbing the addresses in the initial run, as they are
    stable.  So remove that runto_main call.
    
    [1] https://inbox.sourceware.org/gdb-patches/[email protected]/
    
    Approved-By: Simon Marchi <[email protected]>

Diff:
---
 gdb/testsuite/gdb.dwarf2/dw2-entry-pc.exp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-entry-pc.exp b/gdb/testsuite/gdb.dwarf2/dw2-entry-pc.exp
index 441aa0fde1d..f7cc7f7c067 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-entry-pc.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-entry-pc.exp
@@ -28,11 +28,7 @@ standard_testfile
 get_func_info foo
 
 if { [prepare_for_testing "failed to prepare" ${testfile} \
-	  [list ${srcfile}]] } {
-    return -1
-}
-
-if {![runto_main]} {
+	  [list ${srcfile}] {debug nopie}]} {
     return -1
 }
 
@@ -83,7 +79,7 @@ proc get_next_suffix {} {
 
 proc build_and_runto_main { suffix asm_file } {
     if {[prepare_for_testing "failed to prepare" "${::testfile}-${suffix}" \
-	     [list $::srcfile $asm_file] {nodebug}]} {
+	     [list $::srcfile $asm_file] {nodebug nopie}]} {
 	return false
     }