macOS provides a PCRE2 library in base that is not usable and not
configured properly, as it installs a pkgconf module that
points to a non-existent pcre2.h header in /usr/local/include.
Detect that case and if the feature is enabled, try to fallback
to a wrapped subproject through an anonymous dependency, aborting
with an error if that is not possible.
Change the feature to "auto" and print a warning and disable it
if a broken dependency was detected, but to keep consistency
with the cmake build system used on Windows, add a special rule
to re-enable the pcre2 feature by default there.
Helped-by: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
Suggested-by: Eli Schwartz <eschwartz@xxxxxxxxxx>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@xxxxxxxxx>
---
meson.build | 28 +++++++++++++++++++++++++++-
meson_options.txt | 2 +-
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/meson.build b/meson.build
index 596f5ac711..5225efb4a6 100644
--- a/meson.build
+++ b/meson.build
@@ -1055,7 +1055,33 @@ else
build_options_config.set('NO_ICONV', '1')
endif
-pcre2 = dependency('libpcre2-8', required: get_option('pcre2'), default_options: ['default_library=static', 'test=false'])
+# can't use enable_auto_if() because it is only available in meson 1.1
+if host_machine.system() == 'windows' and get_option('pcre2').allowed()
+ pcre2_feature = true
+else
+ pcre2_feature = get_option('pcre2')
+endif
+pcre2 = dependency('libpcre2-8', required: pcre2_feature, default_options: ['default_library=static', 'test=false'])
+if pcre2.found() and pcre2.type_name() != 'internal' and host_machine.system() == 'darwin'
+ # macOS installs a broken system package, double check
+ if not compiler.has_header('pcre2.h', dependencies: pcre2)
+ if pcre2_feature.enabled()
+ pcre2_fallback = ['pcre2', 'libpcre2_8']
+ else
+ pcre2_fallback = []
+ endif
+ # Attempt to fallback or replace with not-found-dependency
+ pcre2 = dependency('', required: false, fallback: pcre2_fallback, default_options: ['default_library=static', 'test=false'])
+ if not pcre2.found()
+ if pcre2_feature.enabled()
+ error('only a broken pcre2 install found and pcre2 is required')
+ else
+ warning('broken pcre2 install found, disabling pcre2 feature')
+ endif
+ endif
+ endif
+endif
+
if pcre2.found()
libgit_dependencies += pcre2
libgit_c_args += '-DUSE_LIBPCRE2'
diff --git a/meson_options.txt b/meson_options.txt
index e7f768df24..1668f260a1 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -45,7 +45,7 @@ option('gitweb', type: 'feature', value: 'auto',
description: 'Build Git web interface. Requires Perl.')
option('iconv', type: 'feature', value: 'auto',
description: 'Support reencoding strings with different encodings.')
-option('pcre2', type: 'feature', value: 'enabled',
+option('pcre2', type: 'feature', value: 'auto',
description: 'Support Perl-compatible regular expressions in e.g. git-grep(1).')
option('perl', type: 'feature', value: 'auto',
description: 'Build tools written in Perl.')
--
2.39.5 (Apple Git-154)
