Mesa(18): Use libllvm virtual package (#28365)

* Mesa(18): Use libllvm virtual package

* Mesa patch configuration

Patch Mesa to define LLVM_VERSION_SUFFIX if llvm is pre-release

* Patch llvm-config to define LLVM_VERSION_SUFFIX

var/spack/repos/builtin/packages/llvm-amdgpu/llvm-version-suffix-macro.patch

@@ -0,0 +1,14 @@
+diff --git a/llvm/include/llvm/Config/llvm-config.h.cmake b/llvm/include/llvm/Config/llvm-config.h.cmake
+index 4493bb65d444..e2b3c61b3c33 100644
+--- a/llvm/include/llvm/Config/llvm-config.h.cmake
++++ b/llvm/include/llvm/Config/llvm-config.h.cmake
+@@ -74,6 +74,9 @@
+ /* Patch version of the LLVM API */
+ #define LLVM_VERSION_PATCH ${LLVM_VERSION_PATCH}
+ 
++/* LLVM version suffix */
++#cmakedefine LLVM_VERSION_SUFFIX "${LLVM_VERSION_SUFFIX}"
++
+ /* LLVM version string */
+ #define LLVM_VERSION_STRING "${PACKAGE_VERSION}"
+ 

var/spack/repos/builtin/packages/llvm-amdgpu/package.py

@@ -38,10 +38,15 @@ class LlvmAmdgpu(CMakePackage):
     variant('rocm-device-libs', default=True, description='Build ROCm device libs as external LLVM project instead of a standalone spack package.')
     variant('openmp', default=True, description='Enable OpenMP')
     variant(
-        "llvm_dylib",
+        'llvm_dylib',
         default=False,
-        description="Build LLVM shared library, containing all "
+        description='Build LLVM shared library, containing all '
-        "components in a single shared library",
+        'components in a single shared library',
+    )
+    variant(
+        'link_llvm_dylib',
+        default=False,
+        description='Link LLVM tools against the LLVM shared library',
     )
 
     provides('libllvm@11', when='@3.5:3.8')
@@ -67,6 +72,10 @@ class LlvmAmdgpu(CMakePackage):
     # This is already fixed in upstream but not in 4.2.0 rocm release
     patch('fix-spack-detection-4.2.0.patch', when='@4.2.0:')
 
+    # Add LLVM_VERSION_SUFFIX
+    # https://reviews.llvm.org/D115818
+    patch('llvm-version-suffix-macro.patch', when='@:4.3.2')
+
     conflicts('^cmake@3.19.0')
 
     root_cmakelists_dir = 'llvm'
@@ -145,7 +154,10 @@ def cmake_args(self):
             ])
 
         if '+llvm_dylib' in self.spec:
-            cmake_args.append("-DLLVM_BUILD_LLVM_DYLIB:Bool=ON")
+            args.append("-DLLVM_BUILD_LLVM_DYLIB:Bool=ON")
+
+        if '+link_llvm_dylib' in self.spec:
+            args.append("-DLLVM_LINK_LLVM_DYLIB:Bool=ON")
 
         # Get the GCC prefix for LLVM.
         if self.compiler.name == "gcc":

var/spack/repos/builtin/packages/llvm/llvm-version-suffix-macro.patch

@@ -0,0 +1,14 @@
+diff --git a/llvm/include/llvm/Config/llvm-config.h.cmake b/llvm/include/llvm/Config/llvm-config.h.cmake
+index 4493bb65d444..e2b3c61b3c33 100644
+--- a/llvm/include/llvm/Config/llvm-config.h.cmake
++++ b/llvm/include/llvm/Config/llvm-config.h.cmake
+@@ -74,6 +74,9 @@
+ /* Patch version of the LLVM API */
+ #define LLVM_VERSION_PATCH ${LLVM_VERSION_PATCH}
+ 
++/* LLVM version suffix */
++#cmakedefine LLVM_VERSION_SUFFIX "${LLVM_VERSION_SUFFIX}"
++
+ /* LLVM version string */
+ #define LLVM_VERSION_STRING "${PACKAGE_VERSION}"
+ 

var/spack/repos/builtin/packages/llvm/package.py

@@ -342,6 +342,10 @@ class Llvm(CMakePackage, CudaPackage):
     patch('no_cyclades.patch', when='@10:12.0.0')
     patch('no_cyclades9.patch', when='@6:9')
 
+    # Add LLVM_VERSION_SUFFIX
+    # https://reviews.llvm.org/D115818
+    patch('llvm-version-suffix-macro.patch', when='@:13.0.0')
+
     # The functions and attributes below implement external package
     # detection for LLVM. See:
     #

var/spack/repos/builtin/packages/mesa/mesa_check_llvm_version_suffix.patch

@@ -0,0 +1,23 @@
+diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+index be288ab02e2..378381b16ff 100644
+--- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
++++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+@@ -619,8 +619,15 @@ lp_is_function(LLVMValueRef v)
+ extern "C" void
+ lp_set_module_stack_alignment_override(LLVMModuleRef MRef, unsigned align)
+ {
+-#if LLVM_VERSION_MAJOR >= 13
+-   llvm::Module *M = llvm::unwrap(MRef);
+-   M->setOverrideStackAlignment(align);
++// Check that the LLVM version is >= 13.0.0 "release"
++// llvm::Module::setOverrideStackAlignment was added during the LLVM 13.0.0 development cycle and
++// cannot be guarenteed to exist until the official release.
++#if (                                                                                              \
++  LLVM_VERSION_MAJOR > 13 ||                                                                       \
++  (LLVM_VERSION_MAJOR == 13 &&                                                                     \
++   (LLVM_VERSION_MINOR > 0 ||                                                                      \
++    (LLVM_VERSION_MINOR == 0 && (LLVM_VERSION_PATCH > 0 || !defined(LLVM_VERSION_SUFFIX))))))
++  llvm::Module* M = llvm::unwrap(MRef);
++  M->setOverrideStackAlignment(align);
+ #endif
+ }

var/spack/repos/builtin/packages/mesa/package.py

@@ -80,7 +80,7 @@ class Mesa(MesonPackage):
     provides('osmesa', when='+osmesa')
 
     # Variant dependencies
-    depends_on('llvm@6:12', when='+llvm')
+    depends_on('libllvm@6:', when='+llvm')
     depends_on('libx11',  when='+glx')
     depends_on('libxcb',  when='+glx')
     depends_on('libxext', when='+glx')
@@ -106,6 +106,8 @@ class Mesa(MesonPackage):
     # requires native to be added to llvm_modules when using gallium swrast
     patch('https://cgit.freedesktop.org/mesa/mesa/patch/meson.build?id=054dd668a69acc70d47c73abe4646e96a1f23577', sha256='36096a178070e40217945e12d542dfe80016cb897284a01114d616656c577d73', when='@21.0.0:21.0.3')
 
+    patch('mesa_check_llvm_version_suffix.patch', when='@21.2.3:')
+
     # 'auto' needed when shared llvm is built
     @when('^llvm~shared_libs')
     def patch(self):
@@ -175,18 +177,19 @@ def meson_args(self):
 
         if '+llvm' in spec:
             # Fix builds on hosts where /usr/bin/llvm-config-* is found and provides an
-            # incompatible version. Ensure that the llvm-config of spec['llvm'] is used.
+            # incompatible version. Ensure that the llvm-config of spec['libllvm'] is
+            # used.
             args.append('--native-file')
             args.append('meson-native-config.ini')
             mkdirp(self.build_directory)
             with working_dir(self.build_directory):
                 with open('meson-native-config.ini', 'w') as native_config:
-                    llvm_config = spec['llvm'].prefix.bin + '/llvm-config'
+                    llvm_config = spec['libllvm'].prefix.bin + '/llvm-config'
                     native_config.write('[binaries]\n')
                     native_config.write("llvm-config = '{0}'\n".format(llvm_config))
             args.append('-Dllvm=enabled')
             args.append(opt_enable(
-                '+llvm_dylib' in spec['llvm'], 'shared-llvm'))
+                '+llvm_dylib' in spec['libllvm'], 'shared-llvm'))
         else:
             args.append('-Dllvm=disabled')
 

var/spack/repos/builtin/packages/mesa18/package.py

@@ -61,7 +61,7 @@ class Mesa18(AutotoolsPackage):
     provides('osmesa', when='+osmesa')
 
     # Variant dependencies
-    depends_on('llvm@6:10', when='+llvm')
+    depends_on('libllvm@6:10', when='+llvm')
     depends_on('libx11',  when='+glx')
     depends_on('libxcb',  when='+glx')
     depends_on('libxext', when='+glx')
@@ -138,8 +138,8 @@ def configure_args(self):
 
         if '+llvm' in spec:
             args.append('--enable-llvm')
-            args.append('--with-llvm-prefix=%s' % spec['llvm'].prefix)
+            args.append('--with-llvm-prefix=%s' % spec['libllvm'].prefix)
-            if '+llvm_dylib' in spec['llvm']:
+            if '+llvm_dylib' in spec['libllvm']:
                 args.append('--enable-llvm-shared-libs')
             else:
                 args.append('--disable-llvm-shared-libs')