您可以将其视为一种“加固”选项,因为它确保您对库函数的调用最终都会到达那里。但我发现一个问题是一些项目测试套件。
例如,libvirt测试套件希望调用刚构建的libvirt0.so,但也要模拟从那里进行的某些调用。
由于在构建中使用了-Bsymbolic-functions,这会破坏测试,因为调用原始函数而不是模拟函数。
示例回溯
良好情况:
#0 virHostCPUGetThreadsPerSubcore (arch=VIR_ARCH_PPC64) at ../../../tests/virhostcpumock.c:30
#1 0x00007ffff7c1e4c4 in virHostCPUGetInfoPopulateLinux (cpuinfo=<optimized out>, arch=VIR_ARCH_PPC64, cpus=0x7fffffffdf38, mhz=<optimized out>, nodes=0x7fffffffdf40, sockets=0x7fffffffdf44, cores=0x7fffffffdf48, threads=0x7fffffffdf4c)
at ../../../src/util/virhostcpu.c:661
#2 0x0000555555557e6f in linuxTestCompareFiles (outputfile=0x55555558f150 "/build/libvirt-OUKR8i/libvirt-4.10.0/tests/virhostcpudata/linux-ppc64-subcores2.expected", arch=VIR_ARCH_PPC64,·
cpuinfofile=0x5555555a3f10 "/build/libvirt-OUKR8i/libvirt-4.10.0/tests/virhostcpudata/linux-ppc64-subcores2.cpuinfo") at ../../../tests/virhostcputest.c:44
#3 linuxTestHostCPU (opaque=<optimized out>) at ../../../tests/virhostcputest.c:189
#4 0x000055555555914d in virTestRun (title=0x55555555c0a1 "subcores2", body=0x555555557cc0 <linuxTestHostCPU>, data=0x7fffffffe0c0) at ../../../tests/testutils.c:176
#5 0x000055555555781a in mymain () at ../../../tests/virhostcputest.c:263
#6 0x0000555555559df4 in virTestMain (argc=1, argv=0x7fffffffe2c8, func=0x5555555577b0 <mymain>) at ../../../tests/testutils.c:1114
#7 0x00007ffff79bb09b in __libc_start_main (main=0x5555555576a0 <main>, argc=1, argv=0x7fffffffe2c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe2b8) at ../csu/libc-start.c:308
#8 0x00005555555576ea in _start () at ../../../tests/virhostcputest.c:278
糟糕的情况:
#0 virHostCPUGetThreadsPerSubcore (arch=arch@entry=VIR_ARCH_PPC64) at ../../../src/util/virhostcpu.c:1119
#1 0x00007ffff7c27e04 in virHostCPUGetInfoPopulateLinux (cpuinfo=<optimized out>, arch=VIR_ARCH_PPC64, cpus=0x7fffffffdea8, mhz=<optimized out>, nodes=0x7fffffffdeb0, sockets=0x7fffffffdeb4, cores=0x7fffffffdeb8, threads=0x7fffffffdebc)
at ../../../src/util/virhostcpu.c:661
#2 0x0000555555557e6f in linuxTestCompareFiles (outputfile=0x5555555a5c30 "/build/libvirt-4biJ7f/libvirt-4.10.0/tests/virhostcpudata/linux-ppc64-subcores2.expected", arch=VIR_ARCH_PPC64,·
cpuinfofile=0x55555558fd20 "/build/libvirt-4biJ7f/libvirt-4.10.0/tests/virhostcpudata/linux-ppc64-subcores2.cpuinfo") at ../../../tests/virhostcputest.c:44
#3 linuxTestHostCPU (opaque=<optimized out>) at ../../../tests/virhostcputest.c:189
#4 0x000055555555914d in virTestRun (title=0x55555555c0a1 "subcores2", body=0x555555557cc0 <linuxTestHostCPU>, data=0x7fffffffe030) at ../../../tests/testutils.c:176
#5 0x000055555555781a in mymain () at ../../../tests/virhostcputest.c:263
#6 0x0000555555559df4 in virTestMain (argc=1, argv=0x7fffffffe238, func=0x5555555577b0 <mymain>) at ../../../tests/testutils.c:1114
#7 0x00007ffff79b009b in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#8 0x00005555555576ea in _start () at ../../../tests/virhostcputest.c:278
比较这两个函数virHostCPUGetThreadsPerSubcore
的源代码,你会看到它们之间的差异。
我见过另一种情况:
由于原始问题是关于潜在缺点的,所以我认为值得提及这些相关问题的常见类别。