In 89146e84c9, a heuristic was introduced where
if libLLVMSupport is available as a static library, LLVM itself is assumed
to be availble as a static library as a whole.
This is unfortunately not the case at least on Gentoo and Arch Linux, where
a subsequent llvm-config call yields:
```
$ /usr/lib/llvm/17/bin/llvm-config --libfiles --link-static
llvm-config: error: missing: /usr/lib/llvm/17/lib64/libLLVMTargetParser.a
llvm-config: error: missing: /usr/lib/llvm/17/lib64/libLLVMBinaryFormat.a
llvm-config: error: missing: /usr/lib/llvm/17/lib64/libLLVMBitstreamReader.a
llvm-config: error: missing: /usr/lib/llvm/17/lib64/libLLVMRemarks.a
[...]
```
On Gentoo, where LLVM's static libraries are not included, we still have:
```
$ equery f llvm:17 | grep -i lib64/.*.a$
/usr/lib/llvm/17/lib64/libLLVMDemangle.a
/usr/lib/llvm/17/lib64/libLLVMSupport.a
/usr/lib/llvm/17/lib64/libLLVMTableGen.a
/usr/lib/llvm/17/lib64/libLLVMTestingAnnotations.a
/usr/lib/llvm/17/lib64/libLLVMTestingSupport.a
/usr/lib/llvm/17/lib64/libllvm_gtest.a
/usr/lib/llvm/17/lib64/libllvm_gtest_main.a
```
Therefore, testing for libLLVMSupport is insufficient. We now try libLLVMCore
instead, as that appears to only be installed when LLVM truly has static libraries
available. libLLVMCore is handled as a LLVM component which gives us some guarantee
this is supposed to be happening and not a fluke.
(Specifically, LLVM's llvm/lib/Support/CMakeLists.txt pays 0 attention to
-DLLVM_BUILD_LLVM_DYLIB and -DLLVM_LINK_LLVM_DYLIB, and is hence only affected
by -DBUILD_SHARED_LIBS, which LLVM upstream say is only to be used for development.
Therefore, with -DBUILD_SHARED_LIBS=OFF (as is recommended/the default) and
-DLLVM_BUILD_LLVM_DYLIB=ON, you will get a static libLLVMSupport, without it
indicating anything about the rest of your configuration.)
Closes: https://github.com/mesonbuild/meson/issues/12323
Fixes: 89146e84c9
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
llvm-config is unsuitable for standard cross-compile,
because we need to build llvm especially for it, which
is not done is almost any distros, so, for example,
standard bootstrap chroot will be unsuitable.
This patch is trying to acheive feature parity between
config-tool searching of LLVM and CMake-based one,
which is arch-agnostic.
Signed-off-by: Konstantin <ria.freelander@gmail.com>
Some CMake packages fail to find at all if no version is specified.
This commit adds a cmake_version parameter to dependency() to allow you
to specify the requested version.
D lang compilers have an option -release (or similar) which turns off
asserts, contracts, and other runtime type checking. This patch wires
that up to the b_ndebug flag.
Fixes#7082
cmake: get language from Meson project if not specified as depedency(..., langugage: ...)
deps: add threads method:cmake
dependency('threads', method: 'cmake') is useful for cmake unit tests
or those who just want to find threads using cmake.
cmake: project(... Fortran) generally also requires C language
There are two variables that CMake takes into account during
find_package() in cross-compiled environments, which are: CMAKE_SYSROOT
and CMAKE_FIND_ROOT_PATH. Those are used in cmFindCommon::RerootPaths()
function, which blindly prepends all search paths with those specified
via CMAKE_SYSROOT and CMAKE_FIND_ROOT_PATH.
Extend search paths by using CMAKE_SYSROOT and CMAKE_FIND_ROOT_PATH in a
similar way as CMake does, so we successfully find CMake packages
information in cross-compiled environments.
Sam James
Volker Weißmann
Josh Soref
Konstantin
Daniel Mensinger
Eli Schwartz
Jason Ekstrand
Dylan Baker
Michael Hirsch, Ph.D
Marcin Niestroj