[PATCH v2] gn: remove gcc override

[Jon Mason <jdmason@kudzu.us>]

When compiling gn with clang, the following errors are being seen (with
qemuarm64-secureboot machine, possibly others):

In file included from /usr/include/c++/12/string:40,
                 from ../sources/gn-0+git/src/base/strings/string_number_conversions.h:11,
                 from ../sources/gn-0+git/src/gn/operators.cc:10:
In static member function ‘static constexpr void std::char_traits<char>::assign(char_type&, const char_type&)’,
    inlined from ‘static constexpr void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_S_copy(_CharT*, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:421:23,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_M_replace(size_type, size_type, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.tcc:532:22,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::assign(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:1647:19,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:815:28,
    inlined from ‘Err {anonymous}::MakeOverwriteError(const BinaryOpNode*, const Value&)’ at ../sources/gn-0+git/src/gn/operators.cc:202:17:
/usr/include/c++/12/bits/char_traits.h:354:16: error: ‘((const std::char_traits<char>::char_type*)((char*)&empty_def + offsetof(std::__cxx11::string, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::<unnamed>)))[2]’ may be used uninitialized [-Werror=maybe-uninitialized]
  354 |         __c1 = __c2;
      |                ^~~~
../sources/gn-0+git/src/gn/operators.cc: In function ‘Err {anonymous}::MakeOverwriteError(const BinaryOpNode*, const Value&)’:
../sources/gn-0+git/src/gn/operators.cc:198:15: note: ‘empty_def’ declared here
  198 |   std::string empty_def;
      |               ^~~~~~~~~
In static member function ‘static constexpr void std::char_traits<char>::assign(char_type&, const char_type&)’,
    inlined from ‘static constexpr void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_S_copy(_CharT*, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:421:23,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_M_replace(size_type, size_type, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.tcc:532:22,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::assign(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:1647:19,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/12/bits/basic_string.h:815:28,
    inlined from ‘Err {anonymous}::MakeOverwriteError(const BinaryOpNode*, const Value&)’ at ../sources/gn-0+git/src/gn/operators.cc:205:17:
/usr/include/c++/12/bits/char_traits.h:354:16: error: ‘((const std::char_traits<char>::char_type*)((char*)&empty_def + offsetof(std::__cxx11::string, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::<unnamed>)))[2]’ may be used uninitialized [-Werror=maybe-uninitialized]
  354 |         __c1 = __c2;
      |                ^~~~
../sources/gn-0+git/src/gn/operators.cc: In function ‘Err {anonymous}::MakeOverwriteError(const BinaryOpNode*, const Value&)’:
../sources/gn-0+git/src/gn/operators.cc:198:15: note: ‘empty_def’ declared here
  198 |   std::string empty_def;
      |               ^~~~~~~~~
cc1plus: all warnings being treated as errors

Remove the toolchain-gcc override to allow the cflag
-Wno-error=maybe-uninitialized to be applied.

Signed-off-by: Jon Mason <jon.mason@arm.com>
---
 meta/recipes-devtools/gn/gn_git.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-devtools/gn/gn_git.bb b/meta/recipes-devtools/gn/gn_git.bb
index d8896609b193..87ccfe370456 100644
--- a/meta/recipes-devtools/gn/gn_git.bb
+++ b/meta/recipes-devtools/gn/gn_git.bb
@@ -49,4 +49,4 @@ BBCLASSEXTEND = "native"
 
 COMPATIBLE_HOST = "^(?!riscv32).*"
 
-CFLAGS:append:toolchain-gcc = " -Wno-error=maybe-uninitialized"
+CFLAGS += "-Wno-error=maybe-uninitialized"
-- 
2.39.5