Fix bundled libpcre2 build regarding the `-fcf-protection` gcc flag

Cf. <https://bugs.exim.org/show_bug.cgi?id=2578>.

Fix bug #78197: PCRE2 version check

When external PCRE library version is of format ##.##-RC# the check
failed.

Enable pcre valgrind support only in DEBUG build (it affects performance)

Upgrade bundled PCRE2 to 10.33

Use PKG_CHECK_MODULES to detect valgrind, and share build config with pcre

Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment characte

Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment character # which is visible in the output.
- Line length normalized to 80 columns
- Dots for most of the one line sentences
- Macro definitions include similar pattern header comments now

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ext/pcre/config0.m4: add ac_cv_have_pcre2_jit variable

The HAVE_PCRE_JIT_SUPPORT check uses AC_RUN_IFELSE, which is not
available when cross-compiling. As a fallback, JIT support is enab

ext/pcre/config0.m4: add ac_cv_have_pcre2_jit variable

The HAVE_PCRE_JIT_SUPPORT check uses AC_RUN_IFELSE, which is not
available when cross-compiling. As a fallback, JIT support is enabled
based on CPU architecture. However, this may be wrong,
e.g. when the JIT the feature was not enabled in the pcre2 build.

Add a cache variable for the PCRE JIT feature to make it possible to
override the check.

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Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not

Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not
anymore.

[1] https://www.gnu.org/software/autoconf/manual/autoconf.html#Pretty-Help-Strings

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fix build with external libpcre2

Fix bogus $PHP_PCRE_REGEX checks

This variable was dropped in the pkg-config migration, which resulted
in spurious warnings about using valgrind with external PCRE. Fix the
checks to

Fix bogus $PHP_PCRE_REGEX checks

This variable was dropped in the pkg-config migration, which resulted
in spurious warnings about using valgrind with external PCRE. Fix the
checks to use the right variable.

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Require pkg-config for external PCRE

Use standard PKG_CHECK_MODULES macro and remove the fallback case.
The option is renamed to --with-external-pcre and no longer accepts
an explici

Require pkg-config for external PCRE

Use standard PKG_CHECK_MODULES macro and remove the fallback case.
The option is renamed to --with-external-pcre and no longer accepts
an explicit path -- it should be specified through pkg-config instead.

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Implement handling for JIT recognition when cross compiling

Change the way JIT availability is checked

The pcre2_jit_compile_8 sysmbol is always available, even JIT might be
not. If JIT is not enabled explicitly and is enabled in the PHP runtime,

Change the way JIT availability is checked

The pcre2_jit_compile_8 sysmbol is always available, even JIT might be
not. If JIT is not enabled explicitly and is enabled in the PHP runtime,
this will lead to a malfunction. This approach ensures JIT is indeed
available on the given platform. For cross compilation this might get
complicated, as it would require an explicit processor architecture and
PCRE2 version check.

Another solution for this case is to run pcre2_config at runtime. That
however would require more condition checks that would impact
architectures where JIT is available.

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Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

Sync leading and final newlines in source code files

This patch adds missing newlines, trims multiple redundant final
newlines into a single one, and trims redundant leading newlines.

According to POSIX, a line is a sequence of zero or more non-' <newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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Trim trailing whitespace in source code files

Trim trailing whitespace in source code files

Allow to disable pcre.jit when system library is used
as it is for now broken on some arch (s390x...)

Trim trailing whitespaces in build files

Some editors utilizing .editorconfig automatically trim whitespaces. For
convenience this patch removes whitespaces in certain build files:
-

Trim trailing whitespaces in build files

Some editors utilizing .editorconfig automatically trim whitespaces. For
convenience this patch removes whitespaces in certain build files:
- ext/*/config*.m4
- configure.ac
- acinclude.m4

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Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Switch to more robust config for external pcre2

For the standard layout the first option is pkg-config. Otherwise,
pcre2-config is used, which is produced by a manual installation into a

Switch to more robust config for external pcre2

For the standard layout the first option is pkg-config. Otherwise,
pcre2-config is used, which is produced by a manual installation into a
prefix. This removes the most of the hackish pieces like checking for
the lib filenames and parsing headers.

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Fix regex

Revamp pcre config for build with external lib

- support multiarch in addition to the usual lib path
- fix symbol checks
- fix jit availability check
- exit early on unsupported

Revamp pcre config for build with external lib

- support multiarch in addition to the usual lib path
- fix symbol checks
- fix jit availability check
- exit early on unsupported version

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