Fixed main() prototypes in auto tests.

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

Fixed main() prototypes in auto tests.

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>

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Fixed "make tests" build without preceding "make".

Currently almost all Unit object files depends on generated nxt_version.h.
This patch adds missing dependence and fixes running make with multiple

Fixed "make tests" build without preceding "make".

Currently almost all Unit object files depends on generated nxt_version.h.
This patch adds missing dependence and fixes running make with multiple
jobs.

This closes #318 issue on GitHub.

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Perl: propagated compile options from perl build.

Some Perl compile options affects ABI and not using them while compiling
our module resulted in non-working build.

Notably on 32-bit Debian 10, Per

Perl: propagated compile options from perl build.

Some Perl compile options affects ABI and not using them while compiling
our module resulted in non-working build.

Notably on 32-bit Debian 10, Perl is built with -D_FILE_OFFSET_BITS=64
and our module after being compiled without this option caused segmentation
faults in unexpected places.

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Perl: removed "--include=" configure option.

It's surplus option because the perl executable returns the proper path.

Also the Perl module configure script was cleaned up a bit.
Note that NXT_PERL_

Perl: removed "--include=" configure option.

It's surplus option because the perl executable returns the proper path.

Also the Perl module configure script was cleaned up a bit.
Note that NXT_PERL_LDOPTS already contains the library path.

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Fixed building perl on Alpine Linux.

_GNU_SOURCE is required there to expose off64_t and other types.

Unit application library.

Library now used in all language modules.
Old 'nxt_app_*' code removed.

See src/test/nxt_unit_app_test.c for usage sample.

Removed -mmacosx-version-min option.

Added check of "make install" ability.

This closes #136 issue on GitHub.

Changed version processing for modules.

Perl: use ExtUtils::Embed in configure.

Added Perl support.