ELF インタープリタの自動検出に対応

CMakeLists.txt

@@ -42,6 +42,7 @@ if(CMAKE_C_COMPILER_ID MATCHES "(GNU|Clang)")
 	set(CMAKE_SHARED_LINKER_FLAGS "-fvisibility=hidden")
 
 	if(UNIX AND NOT CYGWIN)
+		include(ElfInterp)
 		set(CMAKE_C_FLAGS "-fPIC ${CMAKE_C_FLAGS}")
 		set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -eshow_version")
 	else(MINGW)

cmake/ElfInterp.cmake

@@ -0,0 +1,19 @@
+
+find_program(OBJCOPY_EXECUTABLE "objcopy")
+if(OBJCOPY_EXECUTABLE)
+	set(ELF_INTERP_BIN ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/elf_interp)
+	set(ELF_INTERP_SRC ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/elf_interp.c)
+	set(ELF_INTERP_DAT ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/elf_interp.dat)
+	
+	file(WRITE ${ELF_INTERP_SRC} "int main(int argc, char **argv) { return 0; }")
+	
+	execute_process(COMMAND ${CMAKE_C_COMPILER} ${CMAKE_C_FLAGS} -o ${ELF_INTERP_BIN} ${ELF_INTERP_SRC})
+	execute_process(COMMAND ${OBJCOPY_EXECUTABLE} -O binary --only-section=.interp ${ELF_INTERP_BIN} ${ELF_INTERP_DAT})
+
+	if(EXISTS ${ELF_INTERP_DAT})
+		file(READ ${ELF_INTERP_DAT} ELF_INTERP)
+		string(STRIP ${ELF_INTERP} ELF_INTERP)
+	endif()
+endif()
+
+message(STATUS "ELF Interpreter: ${ELF_INTERP}")

src/config.h.in

@@ -12,4 +12,6 @@
 #define BUILD_CC_VERSION "@CMAKE_C_COMPILER_VERSION@"
 #define BUILD_GIT_REVISION "@GIT_REVISION@"
 
+#define ELF_INTERP "@ELF_INTERP@"
+
 #endif /* CONFIG_H */

src/version.c

@@ -3,11 +3,7 @@
 
 #if defined(__GNUC__) || defined(__clang__)
 #  if !defined(__APPLE__)
-#    if defined(__x86_64__)
-const char elf_interp[] __attribute__((section(".interp"))) = "/lib64/ld-linux-x86-64.so.2";
-#    else
-const char elf_interp[] __attribute__((section(".interp"))) = "/lib/ld-linux.so.2";
-#    endif
+const char elf_interp[] __attribute__((section(".interp"))) = ELF_INTERP;
 #  endif
 #include <unistd.h>