问C-逻辑表达式2> -3在gcc中的计算

EN

[xiaobai@xiaobai done_read]$ cat my_bool.c 
#include <stdio.h>
int
main() {
        if (2 > -3) {
                printf("true\n" );
        }
        else  {
                printf("false\n" );
        }
}

[xiaobai@xiaobai done_read]$

[xiaobai@xiaobai done_read]$ gcc -g3 my_bool.c     
[xiaobai@xiaobai done_read]$ gdb ./a.out
GNU gdb (GDB) Fedora 7.8.2-39.fc21
...
Reading symbols from ./a.out...done.
(gdb) b *main+1
+b *main+1
Breakpoint 1 at 0x400537: file my_bool.c, line 3.
(gdb) r
+r
Starting program: .../a.out 

Breakpoint 1, 0x0000000000400537 in main () at my_bool.c:3
3       main() {
(gdb) s
+s
5                       printf("true\n" );
(gdb) s
+s
_IO_puts (str=0x4005e0 "true") at ioputs.c:34
34      {
(gdb)

[xiaobai@xiaobai note]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.9.2/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.9.2-20150212/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.9.2-20150212/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.9.2 20150212 (Red Hat 4.9.2-6) (GCC) 
[xiaobai@xiaobai note]$