Repository: mesonbuild/meson

Issue:
[RFE] add RPM macros
we want to create new file called `macros.meson` in `/usr/lib/rpm/macros.d/` when installing meson into system to easy providing meson functions for RPM packagers.

it should look like:

```
%__meson /usr/bin/meson

%meson \
  CFLAGS="${CFLAGS:-%optflags}" ; export CFLAGS ; \
  CXXFLAGS="${CXXFLAGS:-%optflags}" ; export CXXFLAGS ; \
  FFLAGS="${FFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}}" ; export FFLAGS ; \
  FCFLAGS="${FCFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}}" ; export FCFLAGS ; \
  %{?__global_ldflags:LDFLAGS="${LDFLAGS:-%__global_ldflags}" ; export LDFLAGS ;} \
  %__meson \\\
        --prefix=%{_prefix} \\\
        --buildtype=plain
```

Then in RPM specs packagers can use 

```
%build
pushd rpmbuilddir
    %meson ..
popd
```

Instead of custom crap.



Discussion:

Resolving patch:
diff --git a/install_meson.py b/install_meson.py
--- a/install_meson.py
+++ b/install_meson.py
@@ -54,6 +54,7 @@
 out_guimanfile = os.path.join(man_dir, 'mesongui.1.gz')
 in_confmanfile = 'man/mesonconf.1'
 out_confmanfile = os.path.join(man_dir, 'mesonconf.1.gz')
+rpmmacros_dir = os.path.join(install_root, 'lib/rpm/macros.d')
 
 symlink_value = os.path.relpath(bin_script, os.path.dirname(bin_name))
 guisymlink_value = os.path.relpath(gui_script, os.path.dirname(gui_name))
@@ -105,3 +106,8 @@
 if os.path.exists(module_dir):
     shutil.rmtree(module_dir)
 shutil.copytree('modules', module_dir)
+
+print('Installing RPM macros to %s.' % rpmmacros_dir)
+outfilename = os.path.join(rpmmacros_dir, 'macros.meson')
+shutil.copyfile('macros.meson', outfilename)
+shutil.copystat('macros.meson', outfilename)
diff --git a/interpreter.py b/interpreter.py
--- a/interpreter.py
+++ b/interpreter.py
@@ -616,6 +616,12 @@ def method_call(self, method_name, args, kwargs):
                                             self.interpreter.environment.get_build_dir())
         state.subdir = self.interpreter.subdir
         state.environment = self.interpreter.environment
+        state.project_name = self.interpreter.build.project_name
+        state.compilers = self.interpreter.build.compilers
+        state.targets = self.interpreter.build.targets
+        state.headers = self.interpreter.build.get_headers()
+        state.man = self.interpreter.build.get_man()
+        state.pkgconfig_gens = self.interpreter.build.pkgconfig_gens
         value = fn(state, args, kwargs)
         return self.interpreter.module_method_callback(value)
 
diff --git a/modules/rpm.py b/modules/rpm.py
new file mode 100644
--- /dev/null
+++ b/modules/rpm.py
@@ -0,0 +1,155 @@
+# Copyright 2015 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+'''This module provides helper functions for RPM related
+functionality such as generating template RPM spec file.'''
+
+import build
+import compilers
+import datetime
+import mlog
+import os
+
+class RPMModule:
+
+    def generate_spec_template(self, state, args, kwargs):
+        compiler_deps = set()
+        for compiler in state.compilers:
+            if isinstance(compiler, compilers.ValaCompiler):
+                compiler_deps.add('vala')
+            elif isinstance(compiler, compilers.GnuFortranCompiler):
+                compiler_deps.add('gcc-gfortran')
+            elif isinstance(compiler, compilers.GnuObjCCompiler):
+                compiler_deps.add('gcc-objc')
+            elif compiler == compilers.GnuObjCPPCompiler:
+                compiler_deps.add('gcc-objc++')
+            elif isinstance(compiler, (compilers.GnuCCompiler, compilers.GnuCPPCompiler)):
+                # Installed by default
+                pass
+            else:
+                mlog.log('RPM spec file will not created, generating not allowed for:',
+                         mlog.bold(compiler.get_id()))
+                return
+        proj = state.project_name.replace(' ', '_').replace('\t', '_')
+        so_installed = False
+        devel_subpkg = False
+        files = set()
+        files_devel = set()
+        to_delete = set()
+        for target in state.targets.values():
+            if isinstance(target, build.Executable) and target.need_install:
+                files.add('%%{_bindir}/%s' % target.get_filename())
+            elif isinstance(target, build.SharedLibrary) and target.need_install:
+                files.add('%%{_libdir}/%s' % target.get_filename())
+                for alias in target.get_aliaslist():
+                    if alias.endswith('.so'):
+                        files_devel.add('%%{_libdir}/%s' % alias)
+                    else:
+                        files.add('%%{_libdir}/%s' % alias)
+                so_installed = True
+            elif isinstance(target, build.StaticLibrary) and target.need_install:
+                to_delete.add('%%{buildroot}%%{_libdir}/%s' % target.get_filename())
+                mlog.log('Warning, removing', mlog.bold(target.get_filename()),
+                         'from package because packaging static libs not recommended')
+        for header in state.headers:
+            if len(header.get_install_subdir()) > 0:
+                files_devel.add('%%{_includedir}/%s/' % header.get_install_subdir())
+            else:
+                for hdr_src in header.get_sources():
+                    files_devel.add('%%{_includedir}/%s' % hdr_src)
+        for man in state.man:
+            for man_file in man.get_sources():
+                files.add('%%{_mandir}/man%u/%s.*' % (int(man_file.split('.')[-1]), man_file))
+        for pkgconfig in state.pkgconfig_gens:
+            files_devel.add('%%{_libdir}/pkgconfig/%s.pc' % pkgconfig.filebase)
+        if len(files_devel) > 0:
+            devel_subpkg = True
+        fn = open('%s.spec' % os.path.join(state.environment.get_build_dir(), proj),
+                  'w+')
+        fn.write('Name: %s\n' % proj)
+        fn.write('Version: # FIXME\n')
+        fn.write('Release: 1%{?dist}\n')
+        fn.write('Summary: # FIXME\n')
+        fn.write('License: # FIXME\n')
+        fn.write('\n')
+        fn.write('Source0: %{name}-%{version}.tar.xz # FIXME\n')
+        fn.write('\n')
+        for compiler in compiler_deps:
+            fn.write('BuildRequires: %s\n' % compiler)
+        for dep in state.environment.coredata.deps:
+            fn.write('BuildRequires: pkgconfig(%s)\n' % dep)
+        for lib in state.environment.coredata.ext_libs.values():
+            fn.write('BuildRequires: %s # FIXME\n' % lib.fullpath)
+            mlog.log('Warning, replace', mlog.bold(lib.fullpath), 'with real package.',
+                     'You can use following command to find package which contains this lib:',
+                     mlog.bold('dnf provides %s' % lib.fullpath))
+        for prog in state.environment.coredata.ext_progs.values():
+            fn.write('BuildRequires: %s\n' % ' '.join(prog.fullpath))
+        fn.write('BuildRequires: meson\n')
+        fn.write('\n')
+        fn.write('%description\n')
+        fn.write('\n')
+        if devel_subpkg:
+            fn.write('%package devel\n')
+            fn.write('Summary: Development files for %{name}\n')
+            fn.write('Requires: %{name}%{?_isa} = %{version}-%{release}\n')
+            fn.write('\n')
+            fn.write('%description devel\n')
+            fn.write('Development files for %{name}.\n')
+            fn.write('\n')
+        fn.write('%prep\n')
+        fn.write('%autosetup\n')
+        fn.write('rm -rf rpmbuilddir && mkdir rpmbuilddir\n')
+        fn.write('\n')
+        fn.write('%build\n')
+        fn.write('pushd rpmbuilddir\n')
+        fn.write('  %meson ..\n')
+        fn.write('  ninja-build -v\n')
+        fn.write('popd\n')
+        fn.write('\n')
+        fn.write('%install\n')
+        fn.write('pushd rpmbuilddir\n')
+        fn.write('  DESTDIR=%{buildroot} ninja-build -v install\n')
+        fn.write('popd\n')
+        if len(to_delete) > 0:
+            fn.write('rm -rf %s\n' % ' '.join(to_delete))
+        fn.write('\n')
+        fn.write('%check\n')
+        fn.write('pushd rpmbuilddir\n')
+        fn.write('  ninja-build -v test\n')
+        fn.write('popd\n')
+        fn.write('\n')
+        fn.write('%files\n')
+        for f in files:
+            fn.write('%s\n' % f)
+        fn.write('\n')
+        if devel_subpkg:
+            fn.write('%files devel\n')
+            for f in files_devel:
+                fn.write('%s\n' % f)
+        fn.write('\n')
+        if so_installed:
+            fn.write('%post -p /sbin/ldconfig\n')
+            fn.write('\n')
+            fn.write('%postun -p /sbin/ldconfig\n')
+        fn.write('\n')
+        fn.write('%changelog\n')
+        fn.write('* %s meson <meson@example.com> - \n' % datetime.date.today().strftime('%a %b %d %Y'))
+        fn.write('- \n')
+        fn.write('\n')
+        fn.close()
+        mlog.log('Please, look at RPM spec file and fix FIXME\'s')
+
+def initialize():
+    return RPMModule()


Test patch:
diff --git a/manual tests/5 rpm/lib.c b/manual tests/5 rpm/lib.c
new file mode 100644
--- /dev/null
+++ b/manual tests/5 rpm/lib.c	
@@ -0,0 +1,6 @@
+#include"lib.h"
+
+char *meson_print(void)
+{
+  return "Hello, world!";
+}
diff --git a/manual tests/5 rpm/lib.h b/manual tests/5 rpm/lib.h
new file mode 100644
--- /dev/null
+++ b/manual tests/5 rpm/lib.h	
@@ -0,0 +1 @@
+char *meson_print(void);
diff --git a/manual tests/5 rpm/main.c b/manual tests/5 rpm/main.c
new file mode 100644
--- /dev/null
+++ b/manual tests/5 rpm/main.c	
@@ -0,0 +1,8 @@
+#include<lib.h>
+#include<stdio.h>
+int main(int argc, char **argv)
+{
+  char *t = meson_print();
+  printf("%s", t);
+  return 0;
+}
diff --git a/manual tests/5 rpm/meson.build b/manual tests/5 rpm/meson.build
new file mode 100644
--- /dev/null
+++ b/manual tests/5 rpm/meson.build	
@@ -0,0 +1,13 @@
+project('test spec', 'c')
+
+rpm = import('rpm')
+dependency('zlib')
+
+lib = shared_library('mesontest_shared', ['lib.c', 'lib.h'],
+                     version : '0.1', soversion : '0',
+                     install : true)
+executable('mesontest-bin', 'main.c',
+           link_with : lib,
+           install : true)
+
+rpm.generate_spec_template()