configure: get rid of -Wold-style-declaration

* configure (diag_flags): Remove the -Wold-style-declaration
option. It is not useful, unlike -Wold-style-definition;
it warns agains some unspecified old style usages, like
storage class specifiers not being first. Moreover, clang 10
does not recognize this option and complains.

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index 75fd7591..12b97e87 100755
--- a/configure
+++ b/configure
@@ -161,7 +161,7 @@ opt_flags='-O2 -fno-stack-protector'
 lang_flags='-D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200112 -D_GNU_SOURCE'
 diag_flags="-Wall -Wextra -Werror=implicit-function-declaration \
            -Werror=missing-prototypes -Werror=strict-prototypes \
-           -Werror=old-style-declaration -Werror=old-style-definition"
+           -Werror=old-style-definition"
 debug_flags=-g
 debug_only_flags=-DTXR_DEBUG
 debug_also=