cmake-utils.eclass: Make the new ASM-ATT rules actually work

The previous attempt actually broke ASM in media-libs/vulkan-loader
entirely so that it fell back to C code. After much experimentation
and combing through strace output, I found that -x assembler is needed
to handle non-standard file extentions and linking is done as a
separate step. CMAKE_ASM-ATT_LINK_FLAGS therefore needs to be defined
with -nostdlib to avoid errors about undefined main symbols.

Closes: https://bugs.gentoo.org/625844

diff --git a/eclass/cmake-utils.eclass b/eclass/cmake-utils.eclass
index f8853be502a1a185cb2e89d088a7e8ec724466bc..f6952ec09efd2cf2fbcab2057026eedd008bda9f 100644 (file)
--- a/eclass/cmake-utils.eclass
+++ b/eclass/cmake-utils.eclass
@@ -520,7 +520,8 @@ cmake-utils_src_configure() {
        fi
        cat > "${build_rules}" <<- _EOF_ || die
                SET (CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> ${includes} ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "ASM compile command" FORCE)
-               SET (CMAKE_ASM-ATT_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> ${includes} ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "ASM compile command" FORCE)
+               SET (CMAKE_ASM-ATT_COMPILE_OBJECT "<CMAKE_ASM-ATT_COMPILER> <DEFINES> ${includes} ${CPPFLAGS} <FLAGS> -o <OBJECT> -c -x assembler <SOURCE>" CACHE STRING "ASM-ATT compile command" FORCE)
+               SET (CMAKE_ASM-ATT_LINK_FLAGS "-nostdlib" CACHE STRING "ASM-ATT link flags" FORCE)
                SET (CMAKE_C_COMPILE_OBJECT "<CMAKE_C_COMPILER> <DEFINES> ${includes} ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "C compile command" FORCE)
                SET (CMAKE_CXX_COMPILE_OBJECT "<CMAKE_CXX_COMPILER> <DEFINES> ${includes} ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "C++ compile command" FORCE)
                SET (CMAKE_Fortran_COMPILE_OBJECT "<CMAKE_Fortran_COMPILER> <DEFINES> ${includes} ${FCFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "Fortran compile command" FORCE)