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W/ Clang, compile C/C++ testcases with -Wno-unknown-warning-option 

Some C/C++ testcases unconditionally pass -Wno-foo as additional
options to disable some warning.  That is OK with GCC, because GCC
accepts -Wno-foo silently even if it doesn't support -Wfoo.  This is a
feature which allows disabling warnings with newer compilers without
breaking builds with older compilers.  Clang however warns about
unknown -Wno-foo by default, unless you pass
-Wno-unknown-warning-option as well:

 $ gcc -Wno-foo test.c
 * nothing, compiles successfuly *

 $ clang -Wno-foo test.c
 warning: unknown warning option '-Wno-foo [-Wunknown-warning-option]

This commit adds -Wunknown-warning-option centrally in gdb_compile, so
that individual testcases don't have to worry about breaking older
Clangs.

IOW, this avoids this problematic scenario:

#1 - A testcase compiles successfully with Clang version X.
#2 - Clang version "X + 1" adds a new warning, enabled by default,
     which breaks the test.
#3 - We add -Wno-newwarning to the testcase, fixing the testcase with
     clang "X + 1".
#4 - Now building the test with Clang version X no longer works, due
     to "unknown warning option".

gdb/testsuite/ChangeLog:
2020-06-24  Pedro Alves  <palves@redhat.com>

	* lib/gdb.exp (gdb_compile): Update intro comment.  If C/C++ with
	Clang, add "-Wno-unknown-warning-option" to the options.
This commit is contained in:
Pedro Alves 2020-06-24 23:18:19 +01:00
parent a8654e7d78
commit 331733cd4e
2 changed files with 24 additions and 1 deletions
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5
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2020-06-24 Pedro Alves <palves@redhat.com>
* lib/gdb.exp (gdb_compile): Update intro comment. If C/C++ with
Clang, add "-Wno-unknown-warning-option" to the options.
2020-06-23 Andrew Burgess <andrew.burgess@embecosm.com>
* gdb.xml/tdesc-reload.c: New file.

20
gdb/testsuite/lib/gdb.exp
View File

@ -3826,7 +3826,8 @@ set gdb_saved_set_unbuffered_mode_obj ""
# - ldflags=flag: Add FLAG to the linker flags.
# - incdir=path: Add PATH to the searched include directories.
# - libdir=path: Add PATH to the linker searched directories.
# - ada, c++, f77: Compile the file as Ada, C++ or Fortran.
# - ada, c++, f77, f90, go, rust: Compile the file as Ada, C++,
# Fortran 77, Fortran 90, Go or Rust.
# - debug: Build with debug information.
# - optimize: Build with optimization.
@ -3850,6 +3851,23 @@ proc gdb_compile {source dest type options} {
set new_options [universal_compile_options]
}
# Some C/C++ testcases unconditionally pass -Wno-foo as additional
# options to disable some warning. That is OK with GCC, because
# by design, GCC accepts any -Wno-foo option, even if it doesn't
# support -Wfoo. Clang however warns about unknown -Wno-foo by
# default, unless you pass -Wno-unknown-warning-option as well.
# We do that here, so that individual testcases don't have to
# worry about it.
if {[lsearch -exact $options getting_compiler_info] == -1
&& [lsearch -exact $options rust] == -1
&& [lsearch -exact $options ada] == -1
&& [lsearch -exact $options f77] == -1
&& [lsearch -exact $options f90] == -1
&& [lsearch -exact $options go] == -1
&& [test_compiler_info "clang-*"]} {
lappend new_options "additional_flags=-Wno-unknown-warning-option"
}
# Place (and look for) Fortran `.mod` files in the output
# directory for this specific test.
if {[lsearch -exact $options f77] != -1 \