mirror of
https://github.com/libfuse/libfuse.git
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5f3fec6a79
As pointed here [1] __has_attribute() is broken for many attributes and
if it doesn't support the specific attribute it returns true, so we
can't really rely on that for this check. This lead to Buildroot
libfuse3 build failure [2] where that shows up with:
```
error: symver is only supported on ELF platforms
```
Indeed Microblaze doesn't support ELF since it doesn't include elfos.h,
but __has_attribute(symver) returns true.
So let's substitute the #ifdef __has_attribute() with a stronger test on
a function foo() with __attribute__((symver ("test@TEST"))).
[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101766
[2]: http://autobuild.buildroot.net/results/d6c/d6cfaf2aafaeda3c12d127f6a2d2e175b25e654f/build-end.log
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
142 lines
4.5 KiB
Meson
142 lines
4.5 KiB
Meson
project('libfuse3', ['c'], version: '3.10.4',
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meson_version: '>= 0.42',
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default_options: [
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'buildtype=debugoptimized',
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'cpp_std=c++11',
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'warning_level=2',
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])
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platform = host_machine.system()
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if platform == 'darwin'
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error('libfuse does not support OS-X.\n' +
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'Take a look at http://osxfuse.github.io/ instead')
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elif platform == 'cygwin' or platform == 'windows'
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error('libfuse does not support Windows.\n' +
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'Take a look at http://www.secfs.net/winfsp/ instead')
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endif
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#
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# Feature detection
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#
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cfg = configuration_data()
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cc = meson.get_compiler('c')
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# Default includes when checking for presence of functions and
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# struct members
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include_default = '''
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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'''
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args_default = [ '-D_GNU_SOURCE' ]
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cfg.set_quoted('PACKAGE_VERSION', meson.project_version())
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# Test for presence of some functions
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test_funcs = [ 'fork', 'fstatat', 'openat', 'readlinkat', 'pipe2',
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'splice', 'vmsplice', 'posix_fallocate', 'fdatasync',
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'utimensat', 'copy_file_range', 'fallocate' ]
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foreach func : test_funcs
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cfg.set('HAVE_' + func.to_upper(),
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cc.has_function(func, prefix: include_default, args: args_default))
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endforeach
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cfg.set('HAVE_SETXATTR',
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cc.has_function('setxattr', prefix: '#include <sys/xattr.h>'))
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cfg.set('HAVE_ICONV',
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cc.has_function('iconv', prefix: '#include <iconv.h>'))
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# Test if structs have specific member
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cfg.set('HAVE_STRUCT_STAT_ST_ATIM',
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cc.has_member('struct stat', 'st_atim',
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prefix: include_default,
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args: args_default))
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cfg.set('HAVE_STRUCT_STAT_ST_ATIMESPEC',
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cc.has_member('struct stat', 'st_atimespec',
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prefix: include_default,
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args: args_default))
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# Write the test results into config.h (stored in build directory)
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configure_file(output: 'config.h',
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configuration : cfg)
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#
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# Compiler configuration
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#
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add_project_arguments('-D_REENTRANT', '-DHAVE_CONFIG_H', '-Wno-sign-compare',
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'-Wstrict-prototypes', '-Wmissing-declarations', '-Wwrite-strings',
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'-fno-strict-aliasing', language: 'c')
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add_project_arguments('-D_REENTRANT', '-DHAVE_CONFIG_H', '-D_GNU_SOURCE',
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'-Wno-sign-compare', '-Wmissing-declarations',
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'-Wwrite-strings', '-fno-strict-aliasing', language: 'cpp')
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# Some (stupid) GCC versions warn about unused return values even when they are
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# casted to void. This makes -Wunused-result pretty useless, since there is no
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# way to suppress the warning when we really *want* to ignore the value.
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code = '''
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__attribute__((warn_unused_result)) int get_4() {
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return 4;
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}
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int main(void) {
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(void) get_4();
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return 0;
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}'''
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if not cc.compiles(code, args: [ '-O0', '-Werror=unused-result' ])
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message('Compiler warns about unused result even when casting to void')
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add_project_arguments('-Wno-unused-result', language: 'c')
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endif
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# gcc-10 and newer support the symver attribute which we need to use if we
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# want to support LTO
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# recent clang and gcc both support __has_attribute (and if they are too old
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# to have __has_attribute, then they are too old to support symver)
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# other compilers might not have __has_attribute, but in those cases
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# it is safe for this check to fail and for us to fallback to the old _asm_
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# method for symver. Anyway the attributes not supported by __has_attribute()
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# unfortunately return true giving a false positive. So let's try to build
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# using __attribute__ ((symver )) and see the result.
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code = '''
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__attribute__ ((symver ("test@TEST")))
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void foo(void) {
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}
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int main(void) {
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return 0;
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}'''
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if cc.compiles(code, args: [ '-O0', '-c', '-Werror'])
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message('Compiler supports symver attribute')
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add_project_arguments('-DHAVE_SYMVER_ATTRIBUTE', language: 'c')
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else
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message('Compiler does not support symver attribute')
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endif
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# '.' will refer to current build directory, which contains config.h
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include_dirs = include_directories('include', 'lib', '.')
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# Common dependencies
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thread_dep = dependency('threads')
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#
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# Read build files from sub-directories
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#
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subdirs = [ 'lib', 'include']
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if get_option('utils') and not platform.endswith('bsd') and platform != 'dragonfly'
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subdirs += [ 'util', 'doc' ]
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endif
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if get_option('examples')
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subdirs += 'example'
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endif
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if get_option('tests')
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subdirs += 'test'
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endif
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foreach n : subdirs
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subdir(n)
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endforeach
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