Add an alternative for __builtin_clz.

[plocate] / meson.build

diff --git a/meson.build b/meson.build
index 7c6755bcd695e01af23b410d05fc8599e9d63713..e5632607a9bd12cef04147bb4b4cbc0bbf02a3a9 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('plocate', 'cpp', default_options: ['buildtype=debugoptimized','cpp_std=c++17'], version: '1.0.4-pre')
+project('plocate', 'cpp', default_options: ['buildtype=debugoptimized','cpp_std=c++17'], version: '1.0.6-pre')
 
 # Make the version available as a #define.
 add_project_arguments('-DPLOCATE_VERSION="' + meson.project_version() + '"', language: 'cpp')
@@ -7,13 +7,23 @@ cxx = meson.get_compiler('cpp')
 uringdep = dependency('liburing', required: false)
 zstddep = dependency('libzstd')
 threaddep = dependency('threads')
+atomicdep = cxx.find_library('atomic', required: false)
 
 if not uringdep.found()
        add_project_arguments('-DWITHOUT_URING', language: 'cpp')
 endif
 
-executable('plocate', ['plocate.cpp', 'io_uring_engine.cpp', 'turbopfor.cpp', 'parse_trigrams.cpp', 'serializer.cpp'],
-       dependencies: [uringdep, zstddep, threaddep],
+# Function multiversioning is x86-only _and_ not available on certain targets
+# (they need “ifunc”, indirect functions, a GNU extension).
+code = '''__attribute__((target("default"))) void foo();
+__attribute__((target("sse2"))) void foo();
+void bar() { foo(); }'''
+if cxx.compiles(code, name: 'function multiversioning')
+       add_project_arguments('-DHAS_FUNCTION_MULTIVERSIONING', language: 'cpp')
+endif
+
+executable('plocate', ['plocate.cpp', 'io_uring_engine.cpp', 'turbopfor.cpp', 'parse_trigrams.cpp', 'serializer.cpp', 'access_rx_cache.cpp', 'needle.cpp'],
+       dependencies: [uringdep, zstddep, threaddep, atomicdep],
        install: true,
        install_mode: ['rwxr-sr-x', 'root', 'mlocate'])
 executable('plocate-build', 'plocate-build.cpp',