kou opened a new pull request, #41030:
URL: https://github.com/apache/arrow/pull/41030
### Rationale for this change
There are some `unused-but-set-variable` warnings for Vala examples on macOS:
```text
FAILED: example/vala/write-file.p/meson-generated_write-file.c.o
ccache cc -Iexample/vala/write-file.p -Iexample/vala
-I../../c_glib/example/vala -I/Users/runner/work/arrow/arrow/build/c_glib
-I/Users/runner/work/arrow/arrow/c_glib -Iarrow-glib -I../../c_glib/arrow-glib
-I/usr/local/Cellar/glib/2.80.0_2/include
-I/usr/local/Cellar/glib/2.80.0_2/include/glib-2.0
-I/usr/local/Cellar/glib/2.80.0_2/lib/glib-2.0/include
-I/usr/local/opt/gettext/include -I/usr/local/Cellar/pcre2/10.43/include
-I/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/ffi
-fdiagnostics-color=always -Wall -Winvalid-pch -Werror -std=c99 -O0 -g
-DARROW_NO_DEPRECATED_API -MD -MQ
example/vala/write-file.p/meson-generated_write-file.c.o -MF
example/vala/write-file.p/meson-generated_write-file.c.o.d -o
example/vala/write-file.p/meson-generated_write-file.c.o -c
example/vala/write-file.p/write-file.c
write-file.c:373:8: error: variable '_tmp45__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp45__length1;
^
write-file.c:504:8: error: variable '_tmp57__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp57__length1;
^
write-file.c:635:8: error: variable '_tmp69__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp69__length1;
^
write-file.c:766:8: error: variable '_tmp81__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp81__length1;
^
write-file.c:897:8: error: variable '_tmp93__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp93__length1;
^
write-file.c:1028:8: error: variable '_tmp105__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp105__length1;
^
write-file.c:1159:8: error: variable '_tmp117__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp117__length1;
^
write-file.c:1290:8: error: variable '_tmp129__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp129__length1;
^
write-file.c:1421:8: error: variable '_tmp141__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp141__length1;
^
write-file.c:1552:8: error: variable '_tmp153__length1' set but not used
[-Werror,-Wunused-but-set-variable]
gint _tmp153__length1;
^
10 errors generated.
```
### What changes are included in this PR?
Add missing `no` to option that suppress this warning:
-Wunused-but-set-variable ->
-Wno-unused-but-set-variable ->
### Are these changes tested?
Yes.
### Are there any user-facing changes?
No.
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