8f0dd9478e
Future releases of GCC are planning to remove[0] default support for
some old features that were removed from C99 but GCC still accepts.
We can test for these changes by using the following -Werror=
directives
-Werror=implicit-int
-Werror=implicit-function-declaration
-Werror=int-conversion
-Werror=strict-prototypes
-Werror=old-style-definition
Doing so revealed an issue with the auto/ tests in that the test
programs always define main as
int main()
rather than
int main(void)
which results in a bunch of errors like
build/autotest.c:3:23: error: function declaration isn't a prototype [-Werror=strict-prototypes]
3 | int main() {
| ^~~~
build/autotest.c: In function 'main':
build/autotest.c:3:23: error: old-style function definition [-Werror=old-style-definition]
The fix was easy, it only required fixing the main prototype with
find -type f -exec sed -i 's/int main() {/int main(void) {/g' {} \;
Regardless of these upcoming GCC changes, this is probably a good thing
to do anyway for correctness.
[0]: https://fedoraproject.org/wiki/Changes/PortingToModernC
Link: <https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/CJXKTLXJUPZ4F2C2VQOTNMEA5JAUPMBD/>
Link: <https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/6SGHPHPAXKCVJ6PUZ57WVDQ5TDBVIRMF/>
Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
119 lines
2.7 KiB
Plaintext
119 lines
2.7 KiB
Plaintext
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# Copyright (C) Igor Sysoev
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# Copyright (C) NGINX, Inc.
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# Sizes of C types.
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# "-Wall -Werror" or similar constraints in default CFLAGS may require
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# to use "%zu" format to printf() result of sizeof(). But "%zu" may
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# be unavailable, so the "(int)" cast is a simple and portable solution:
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# printf("%d", (int) sizeof(TYPE));
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nxt_feature="int size"
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nxt_feature_name=NXT_INT_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(int));
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return 0;
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}"
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. auto/feature
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nxt_feature="long size"
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nxt_feature_name=NXT_LONG_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(long));
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return 0;
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}"
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. auto/feature
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nxt_feature="long long size"
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nxt_feature_name=NXT_LONG_LONG_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(long long));
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return 0;
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}"
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. auto/feature
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nxt_feature="void * size"
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nxt_feature_name=NXT_PTR_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(void *));
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return 0;
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}"
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. auto/feature
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case "$nxt_feature_value" in
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8) NXT_64BIT=1 ;;
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*) NXT_64BIT=0 ;;
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esac
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nxt_feature="size_t size"
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nxt_feature_name=NXT_SIZE_T_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(size_t));
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return 0;
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}"
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. auto/feature
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nxt_feature="off_t size"
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nxt_feature_name=NXT_OFF_T_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#define _FILE_OFFSET_BITS 64
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#include <unistd.h>
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#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(off_t));
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return 0;
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}"
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. auto/feature
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nxt_feature="time_t size"
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nxt_feature_name=NXT_TIME_T_SIZE
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nxt_feature_run=value
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nxt_feature_incs=
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nxt_feature_libs=
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nxt_feature_test="#include <time.h>
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#include <stdio.h>
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int main(void) {
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printf(\"%d\", (int) sizeof(time_t));
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return 0;
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}"
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. auto/feature
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