问题描述
我正在运行Ubuntu 16.10，并尝试使用gprof分析程序。我用标志-pg进行编译，程序为single-threaded。实际的编译命令为：
g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -fPIC -Wno-unused-parameter -c -o build/obj/performance/stencil_application.o test/performance/stencil_application.cpp
g++ -I. -std=c++11 -Wall -Wextra -O3 -pg -Wno-unused-parameter build/obj/performance/stencil_application.o -o build/test/performance/stencil_application
当我运行该程序时，需要花费几秒钟才能完成，并且会生成一个名为gmon.out的文件。但是，当我运行gprof ./build/test/performance/stencil_application时，得到的输出中没有数字。我只得到表标题和不同字段的解释，如下所示：
Flat profile:
Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
% the percentage of the total running time of the
time program used by this function.
cumulative a running sum of the number of seconds accounted
seconds for by this function and those listed above it.
self the number of seconds accounted for by this
seconds function alone. This is the major sort for this
listing.
calls the number of times this function was invoked, if
this function is profiled, else blank.
self the average number of milliseconds spent in this
ms/call function per call, if this function is profiled,
else blank.
total the average number of milliseconds spent in this
ms/call function and its descendents per call, if this
function is profiled, else blank.
name the name of the function. This is the minor sort
for this listing. The index shows the location of
the function in the gprof listing. If the index is
in parenthesis it shows where it would appear in
the gprof listing if it were to be printed.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
Call graph (explanation follows)
granularity: each sample hit covers 2 byte(s) no time propagated
index % time self children called name
This table describes the call tree of the program, and was sorted by
the total amount of time spent in each function and its children.
等等。
我还尝试了不使用-O3和使用-g进行编译，但结果相同。有人知道怎么了吗？
最佳解决方案
正如上面的Tony Beta Lambda的评论所指出的，这是bug in gcc。有两种可能的解决方法：降级到gcc-4.9，或使用标志-no-pie进行编译。