Hi All, There is a header file in my project: /*regdef.h : MIPS Rx000 symbolic register names for assembler*/ #define zero $0 #define AT $1 #define v0 $2 #define v1 $3 #define a0 $4 #define a1 $5 #define a2 $6 #define a3 $7 #if #abi(n32) || #abi(n64) || #abi(64) || #abi(eabi) #define a4 $8 #define a5 $9 #define a6 $10 #define a7 $11 #define t0 $12 #define t1 $13 #define t2 $14 #define t3 $15 #define ta0 $8 /* alias for $a4 */ #define ta1 $9 /* alias for $a5 */ #define ta2 $10 /* alias for $a6 */ #define ta3 $11 /* alias for $a7 */ #else #define t0 $8 #define t1 $9 #define t2 $10 #define t3 $11 #define t4 $12 #define t5 $13 #define t6 $14 #define t7 $15 #define ta0 $12 /* alias for $t4 */ #define ta1 $13 /* alias for $t5 */ #define ta2 $14 /* alias for $t6 */ #define ta3 $15 /* alias for $t7 */ #endif #define s0 $16 #define s1 $17 #define s2 $18 #define s3 $19 #define s4 $20 #define s5 $21 #define s6 $22 #define s7 $23 #define s8 $30 /* == fp */ #define t8 $24 #define t9 $25 #define k0 $26 #define k1 $27 #define gp $28 #define sp $29 #define fp $30 #define ra $31 I can't find any explaination for the syntax '#abi(n32)' in gcc manual. But gcc can still process this header file and takes the #else branch during compilation. So, how gcc deal with this header file? Best Regards, PRC Nov 17, 2008
