[PATCH 07/59] posix: Suppress -Wignored-attributes when building for confstr.c with clang

[Adhemerval Zanella]

clang issues:

confstr.c:293:1: error: alias will always resolve to __GI___confstr even if weak definition of __GI_confstr is overridden [-Werror,-Wignored-attributes]
  293 | libc_hidden_def (confstr)
      | ^
./../include/libc-symbols.h:549:32: note: expanded from macro 'libc_hidden_def'
  549 | # define libc_hidden_def(name) hidden_def (name)
      |                                ^
./../include/libc-symbols.h:468:29: note: expanded from macro 'hidden_def'
  468 | #  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
      |                                         ^
./../include/libc-symbols.h:460:3: note: expanded from macro '__hidden_ver1'
  460 |   __hidden_ver2 (, local, internal, name)
      |   ^
./../include/libc-symbols.h:465:20: note: expanded from macro '__hidden_ver2'
  465 |     __attribute__((alias (__hidden_asmname (#local))))  \

The weak alias is the intention of the macro.
---
 posix/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/posix/Makefile b/posix/Makefile
index f6421e5379..3f6df25d86 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -600,6 +600,7 @@ CFLAGS-execvp.os = -fomit-frame-pointer
 CFLAGS-execlp.os = -fomit-frame-pointer
 CFLAGS-nanosleep.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fork.c = $(libio-mtsafe) $(config-cflags-wno-ignored-attributes)
+CFLAGS-confstr.c += $(config-cflags-wno-ignored-attributes)
 
 tstgetopt-ARGS = -a -b -cfoobar --required foobar --optional=bazbug \
 		--none random --col --color --colour
-- 
2.43.0