[4/6] gdb/testsuite: add (and use) a new build-id compile option
Commit Message
I noticed that the gdb.debuginfod/fetch_src_and_symbols.exp test was
failing when run with Clang as the compiler.
This test relies on the compiled binaries having a build-id within
them. For GCC, really GNU ld, the default is to always include a
build-id.
When compiling with Clang though, the default is for no build-id.
I did consider *always* turning on the build-id feature when the
compiler is Clang, but that felt a little weird.
Instead, I propose that we add a new 'build-id' compiler option to
gdb_compile, this flag indicates that the test _requires_ a build-id.
In gcc_compile we can then add the required flags if the compiler is
Clang so that we do get a build-id.
With this change the gdb.debuginfod/fetch_src_and_symbols.exp test
now (mostly) passes with Clang 9.0.1 and 15.0.2, and still passes with
gcc. The 'mostly' part is an unrelated issue, and will be addressed
in a later commit in this series.
---
gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp | 4 ++--
gdb/testsuite/lib/gdb.exp | 9 +++++++++
2 files changed, 11 insertions(+), 2 deletions(-)
@@ -32,12 +32,12 @@ if { [catch {file copy -force ${srcdir}/${subdir}/${srcfile} \
return -1
}
-if { [gdb_compile "$sourcetmp" "$binfile" executable {debug}] != "" } {
+if { [gdb_compile "$sourcetmp" "$binfile" executable {debug build-id}] != "" } {
untested "failed to compile"
return -1
}
-if { [gdb_compile "$sourcetmp" "${binfile}2" executable {debug}] != "" } {
+if { [gdb_compile "$sourcetmp" "${binfile}2" executable {debug build-id}] != "" } {
fail "compile"
return -1
}
@@ -4684,6 +4684,7 @@ set gdb_saved_set_unbuffered_mode_obj ""
# - macros: Add the required compiler flag to include macro information in
# debug information
# - text_segment=addr: Tell the linker to place the text segment at ADDR.
+# - build-id: Ensure the final binary includes a build-id.
#
# And here are some of the not too obscure options understood by DejaGnu that
# influence the compilation:
@@ -4746,6 +4747,14 @@ proc gdb_compile {source dest type options} {
}
}
+ # If the 'build-id' option is used, then ensure that we generate a
+ # build-id. GCC does this by default, but Clang does not, so
+ # enable it now.
+ if {[lsearch -exact $options build-id] > 0
+ && [test_compiler_info "clang-*"]} {
+ lappend new_options "additional_flags=-Wl,--build-id"
+ }
+
# Treating .c input files as C++ is deprecated in Clang, so
# explicitly force C++ language.
if { !$getting_compiler_info