[Mesa-dev] [PATCH v2] configure: Check llvm-config --shared-mode

Michel Dänzer michel at daenzer.net
Wed Aug 16 06:40:28 UTC 2017

From: Michel Dänzer <michel.daenzer at amd.com>

https://bugs.llvm.org/show_bug.cgi?id=6823 still affects current LLVM.
llvm-config --libs only reports the single shared library if LLVM was
built with -DLLVM_LINK_LLVM_DYLIB=ON. llvm-config --shared-mode reports
"shared" in that case, "static" otherwise (even if LLVM was built with

v2: Keep the LLVM < 4.0 test. (llvm-config --shared-mode is actually
    available since LLVM 3.8, but that would make the test too
    complicated :)

Fixes: 3d8da1f678e1 ("configure: Trust LLVM >= 4.0 llvm-config --libs
                      for shared libraries")
Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de> # v1
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index e3babd3909..52645bb44f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2646,7 +2646,7 @@ if test "x$enable_llvm" = xyes; then
     if test "x$enable_llvm_shared_libs" = xyes; then
-        if test $LLVM_VERSION_MAJOR -lt 4; then
+        if test $LLVM_VERSION_MAJOR -lt 4 -o "`$LLVM_CONFIG --shared-mode ${LLVM_COMPONENTS}`" = static; then
             dnl llvm-config may not give the right answer when llvm is a built as a
             dnl single shared library, so we must work the library name out for
             dnl ourselves.

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