rpm: couple of improvements and fixes

* Don't hardcode /usr/bin, use %{_bindir}
* Implement %meson_build / %meson_install / %meson_test
* Automatic handling of out-of-tree builds

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

data/macros.meson

@@ -1,12 +1,18 @@
-%__meson /usr/bin/meson
+%__meson %{_bindir}/meson
+%__sourcedir .
+%__builddir %{_target_platform}
+%__meson_ninja_opts -v %{?_smp_mflags} -C %{__builddir}
 
-%meson() %{expand:\
-  export CFLAGS="%{optflags}" ; \
-  export CXXFLAGS="%{optflags}" ; \
-  export FFLAGS="%{optflags} -I%{_fmoddir}" ; \
-  export FCFLAGS="%{optflags} -I%{_fmoddir}" ; \
-  export LDFLAGS="%{__global_ldflags}" ; \
-  %__meson %{?1} \\\
+%meson \
+    export CFLAGS="%{optflags}"                \
+    export CXXFLAGS="%{optflags}"              \
+    export FFLAGS="%{optflags} -I%{_fmoddir}"  \
+    export FCFLAGS="%{optflags} -I%{_fmoddir}" \
+    export LDFLAGS="%{?__global_ldflags}"      \
+    mkdir -p %{__builddir}                     \
+    pushd %{__builddir}                        \
+        %{__meson}                         \\\
+            --buildtype=plain              \\\
             --prefix=%{_prefix}            \\\
             --libdir=%{_libdir}            \\\
             --libexecdir=%{_libexecdir}    \\\
@@ -16,6 +22,8 @@
             --mandir=%{_mandir}            \\\
             --localedir=%{_datadir}/locale \\\
             --sysconfdir=%{_sysconfdir}    \\\
-        --buildtype=plain \
-        %{nil} \
-}
+            $OLDPWD/%{__sourcedir}             \
+    popd
+%meson_build %ninja_build -C %{__builddir}
+%meson_install %ninja_install -C %{__builddir}
+%meson_test %ninja_test -C %{__builddir}

mesonbuild/modules/rpm.py

@@ -104,7 +104,7 @@ class RPMModule:
                          mlog.bold('dnf provides %s' % lib.fullpath))
             for prog in state.environment.coredata.ext_progs.values():
                 if not prog.found():
-                    fn.write('BuildRequires: /usr/bin/%s # FIXME\n' %
+                    fn.write('BuildRequires: %{_bindir}/%s # FIXME\n' %
                              prog.get_name())
                 else:
                     fn.write('BuildRequires: %s\n' % ' '.join(prog.fullpath))
@@ -115,32 +115,25 @@ class RPMModule:
             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('Requires: %{name}%{?_isa} = %{?epoch:%{epoch}:}{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('%meson\n')
+            fn.write('%meson_build\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')
+            fn.write('%meson_install\n')
             if len(to_delete) > 0:
-                fn.write('rm -rf %s\n' % ' '.join(to_delete))
+                fn.write('rm -vf %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('%meson_test\n')
             fn.write('\n')
             fn.write('%files\n')
             for f in files:
@@ -153,7 +146,6 @@ class RPMModule:
                 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')