[binutils-gdb] [gdb/testsuite] Silence compilation fail in gdb.base/rtld-step.exp

[Tom de Vries <vries@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b4d6b738075e2d4be9b4a8d2080bcf94e6b7e229

commit b4d6b738075e2d4be9b4a8d2080bcf94e6b7e229
Author: Tom de Vries <tdevries@suse.de>
Date:   Fri Oct 21 08:36:18 2022 +0200

    [gdb/testsuite] Silence compilation fail in gdb.base/rtld-step.exp
    
    With gcc 7.5.0 and test-case gdb.base/rtld-step.exp, I run into:
    ...
    gdb compile failed, gcc: error: unrecognized command line option \
      '-static-pie'; did you mean '-static'?
    ...
    
    Silence this by checking in the test-case that -static-pie is supported, and
    emitting instead:
    ...
    UNTESTED: gdb.base/rtld-step.exp: \
      failed to compile (-static-pie not supported or static libc missing)
    ...
    
    Tested on x86_64-linux, with:
    - gcc 7.5.0: UNTESTED
    - gcc 12.2.1 with static glibc not installed: UNTESTED
    - gcc 12.2.1 with static glibc installed: PASS

Diff:
---
 gdb/testsuite/gdb.base/rtld-step.exp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gdb/testsuite/gdb.base/rtld-step.exp b/gdb/testsuite/gdb.base/rtld-step.exp
index 4773fa8de3d..0aa2ab0fe1f 100644
--- a/gdb/testsuite/gdb.base/rtld-step.exp
+++ b/gdb/testsuite/gdb.base/rtld-step.exp
@@ -87,6 +87,14 @@ set binfile_rtld [standard_output_file ${rtld_basename}]
 set rtld_flags [list debug additional_flags=[list -static-pie -fPIE \
 						  -nostdlib -static -lc]]
 
+if { ![gdb_can_simple_compile static-pie-static-libc \
+	   "void _start (void) { _exit (0); }" \
+	   executable $rtld_flags] } {
+    set reason "-static-pie not supported or static libc missing"
+    untested "failed to compile ($reason)"
+    return -1
+}
+
 # Main program file names and flags:
 set main_basename ${::gdb_test_file_name}-main
 set srcfile_main ${srcdir}/${subdir}/${main_basename}.c