Add initial support for python bindings

[alexxy/gromacs.git] / cmake / TestInlineASM_gcc_x86.c

diff --git a/cmake/TestInlineASM_gcc_x86.c b/cmake/TestInlineASM_gcc_x86.c
index 152cddfafd63ca46fde188ab9c92ae356b715313..f5b184b7822e654dc225fce32145b06ada3b4f60 100644 (file)
--- a/cmake/TestInlineASM_gcc_x86.c
+++ b/cmake/TestInlineASM_gcc_x86.c
@@ -4,19 +4,24 @@ main()
   unsigned int _eax,_ebx,_ecx,_edx;
   unsigned int level = 0;
 
-  /* Test gcc inline asm for x86 */
-#if defined (__x86_64__) || defined (_M_X64)
+  /* Test gcc inline asm for x86. Note that we CANNOT plainly use __x86_64__
+   * to correspond to a 64-bit environment without also checking that __ILP32__
+   * is NOT set, since x32 uses __x86_64__.
+   */
+#if (defined(__x86_64__) && !defined(__ILP32__))
     __asm__("push %%rbx       \n\t"
             "cpuid            \n\t"
             "movl %%ebx, %1   \n\t"
             "pop %%rbx        \n\t"
             : "=a"(_eax), "=r"(_ebx), "=c"(_ecx), "=d"(_edx) : "0"(level));
-#else
+#elif (defined(__x86_64__) && defined(__ILP32__)) || defined(__i386__)
     __asm__("push %%ebx       \n\t"
             "cpuid            \n\t"
             "movl %%ebx, %1   \n\t"
             "pop %%ebx        \n\t"
             : "=a"(_eax), "=r"(_ebx), "=c"(_ecx), "=d"(_edx) : "0"(level));
+#else
+#    error Cannot detect whether this is a 32-bit or 64-bit x86 build.
 #endif
 
   return 0;