Add platform support for Linux/m68k (#51)

* Add generic platform support for Linux/m68k

* Include sem_t when determining values for FB_ALIGNMENT and FB_DOUBLE_ALIGN

On m68k, 'long long' is 16-bit aligned while 'sem_t' is 32-bit aligned
and we must therefore include 'sem_t' when determining the values for
FB_ALIGNMENT and FB_DOUBLE_ALIGN. Otherwise, the futex system call
will fail on these systems.

* Don't try to include headers for __cpuid on non-x86 targets

* Make sure that the version scripts include _IO_stdin_used on Linux

The GNU C library supports two ABIs for libio, one is the pre-2.1
ABI and the other is the current one. In order to determine which
ABI is to be used, the C library checks whether the _IO_stdin_used
symbol is exported by the executable. In case the symbol is present,
the new ABI is assumed, if the symbol is missing, the old ABI is
assumed. Thus, if an application is linked against a modern version
of glibc, it must export the _IO_stdin_used symbol as otherwise the
executable can crash or provoke other unexpected behavior on some
architectures like PowerPC or MIPS because the C library is using
the old ABI in this case.

builds/posix/vers.sh.in

@@ -57,6 +57,7 @@ platform_linux() {
 		echo "${TAB}$i;"
 	done
 
+	echo "${TAB}_IO_stdin_used;"
 	echo 'local:'
 	echo "${TAB}*;"
 	echo '};'

configure.ac

@@ -363,6 +363,17 @@ dnl CPU_TYPE=ppc64
    SHRLIB_EXT=so
    ;;
 
+  m68k*-*-linux*)
+   MAKEFILE_PREFIX=linux_generic
+   INSTALL_PREFIX=linux
+   PLATFORM=LINUX
+   AC_DEFINE(LINUX, 1, [Define this if OS is Linux])
+   AC_DEFINE(M68K, 1, [Define this if CPU is M68k])
+   LOCK_MANAGER_FLG=Y
+   EDITLINE_FLG=Y
+   SHRLIB_EXT=so
+   ;;
+
   *-*-linux* | *-*-gnu*)
     MAKEFILE_PREFIX=linux_generic
     INSTALL_PREFIX=linux
@@ -1027,10 +1038,11 @@ AC_CHECK_MEMBER([struct dirent.d_type],
 dnl EKU: try to determine the alignment of long and double
 dnl      replaces FB_ALIGNMENT and FB_DOUBLE_ALIGN in src/jrd/common.h
 AC_MSG_CHECKING(alignment of long)
-AC_RUN_IFELSE([AC_LANG_SOURCE([[main () {
+AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <semaphore.h>
+main () {
   struct s {
     char a;
-    long long b;
+    union { long long x; sem_t y; } b;
   };
   exit((int)&((struct s*)0)->b);
 }]])],[ac_cv_c_alignment=$ac_status],[ac_cv_c_alignment=$ac_status],[])

src/common/classes/DbImplementation.cpp

@@ -48,6 +48,7 @@ static const UCHAR CpuHppa = 13;
 static const UCHAR CpuAlpha = 14;
 static const UCHAR CpuArm64 = 15;
 static const UCHAR CpuPowerPc64el = 16;
+static const UCHAR CpuM68k = 17;
 
 static const UCHAR OsWindows = 0;
 static const UCHAR OsLinux = 1;
@@ -87,7 +88,8 @@ const char* hardware[] = {
 	"HPPA",
 	"Alpha",
 	"ARM64",
-	"PowerPC64el"
+	"PowerPC64el",
+	"M68k"
 };
 
 const char* operatingSystem[] = {
@@ -128,8 +130,8 @@ const UCHAR backwardTable[FB_NELEM(hardware) * FB_NELEM(operatingSystem)] =
 
 const UCHAR backEndianess[FB_NELEM(hardware)] =
 {
-//	Intel	AMD		Sparc	PPC		PPC64	MIPSEL	MIPS	ARM		IA64	s390	s390x	SH		SHEB	HPPA	Alpha	ARM64	PowerPC64el
-	0,		0,		1,		1,		1,		0,		1,		0,		0,		1,		1,		0,		1,		1,		0,		0,		0
+//	Intel	AMD		Sparc	PPC		PPC64	MIPSEL	MIPS	ARM		IA64	s390	s390x	SH		SHEB	HPPA	Alpha	ARM64	PowerPC64el	M68k
+	0,		0,		1,		1,		1,		0,		1,		0,		0,		1,		1,		0,		1,		1,		0,		0,		0,		1
 };
 
 } // anonymous namespace

src/common/classes/Hash.cpp

@@ -23,11 +23,13 @@
 #include "firebird.h"
 #include "../common/classes/Hash.h"
 
+#if defined(_M_IX86) || defined(_M_X64) || defined(__x86_64__) || defined(__i386__)
 #ifdef _MSC_VER
 #include <intrin.h>
 #else
 #include <cpuid.h>
 #endif
+#endif
 
 using namespace Firebird;
 

src/common/common.h

@@ -199,6 +199,10 @@
 #define FB_CPU CpuPowerPc64
 #endif /* PPC64 */
 
+#ifdef M68K
+#define FB_CPU CpuM68k
+#endif /* M68K */
+
 #endif /* LINUX */
 
 

src/jrd/inf_pub.h

@@ -241,6 +241,7 @@ enum  info_db_implementations
 	isc_info_db_impl_linux_arm64 = 84,
 	isc_info_db_impl_linux_ppc64el = 85,
 	isc_info_db_impl_linux_ppc64 = 86,
+	isc_info_db_impl_linux_m68k = 87,
 
 
 	isc_info_db_impl_last_value   // Leave this LAST!