【Linux编程】如何使用gcc编译源代码时输出map文件？
描述
熟悉Linux环境编程的童鞋，对gcc一定不是很陌生，它可以高效地将C/C++代码编译成可执行文件。在嵌入式开发领域，gcc更是无比的强大，采用不同编译平台的gcc编译器，对应地就可以生成该平台的bin文件。由于gcc功能强大，在编译Linux内核时，gcc会是编译器的首选。
熟悉编译原理的童鞋对map文件一定很熟悉，但若是平时对底层编译不是很清晰，或者主要开发工作集中在应用层的童鞋，可能对其了解就神乎其微了。这个时候，你就需要好好阅读本文，了解下map文件了。本文要给大家分享生成map文件的方法，后续笔者会再写相关的文章介绍map文件的具体内容。
假设我们有以下的测试源码，功能很简单：
#include
static int test_function(int arg)
{
printf("This is a function called: %s\n", __func__);
return arg;
}
int main(int argc, const char **argv)
{
test_function(0);
return 0;
}
通常我们要得到可执行文件，我们会输入编译命令：
gcc -o gcc_create_map_file gcc_create_map_file.c
得到输出结果，测试如下：
运行结果完全符合我们的期望，编译命令完成后，在当前目录下，生成了gcc_create_map_file这个可执行文件。
但是，如果我们要编译输出可执行文件的同时，也得到可执行文件对应的map文件呢？我们可以这样输入编译命令：
gcc -o gcc_create_map_file gcc_create_map_file.c -Wl,-Map=gcc.map
测试输出，完全没有问题：
编辑
我们对比2个编译命令可以发现，其实就是在原编译命令的后面加上了 "-Wl,-Map=gcc.map"；其中-Wl，是告诉gcc编译器，这个是ld的选项参数；而-Map=xxx.map就是指定map文件输出的文件名称，这个名称xxx可以随意定义，map文件的路径可以是相对路径，也可以是绝对路径。以下就是map文件的详细内容，后续会有文章对它进行详细分析，现在大家先有个感官认识。
Archive member included to satisfy reference by file (symbol)
/usr/lib/x86_64-linux-gnu/libc_nonshared.a(elf-init.oS)
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o (__libc_csu_init)
Discarded input sections
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o
.note.GNU-stack
0x0000000000000000 0x0 /tmp/cc6AliJG.o
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/x86_64-linux-gnu/libc_nonshared.a(elf-init.oS)
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o
.note.GNU-stack
0x0000000000000000 0x0 /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
Memory Configuration
Name Origin Length Attributes
*default* 0x0000000000000000 0xffffffffffffffff
Linker script and memory map
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o
LOAD /tmp/cc6AliJG.o
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/libgcc.a
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/libgcc_s.so
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libc.so
START GROUP
LOAD /lib/x86_64-linux-gnu/libc.so.6
LOAD /usr/lib/x86_64-linux-gnu/libc_nonshared.a
LOAD /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
END GROUP
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/libgcc.a
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/libgcc_s.so
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o
LOAD /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
[!provide] PROVIDE (__executable_start, 0x400000)
0x0000000000400238 . = (0x400000 + SIZEOF_HEADERS)
.interp 0x0000000000400238 0x1c
*(.interp)
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.hash
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.dynstr 0x0000000000400318 0x3f
*(.dynstr)
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.gnu.version 0x0000000000400358 0x8
*(.gnu.version)
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*(.gnu.warning)
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[!provide] PROVIDE (__etext, .)
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0x58 (size before relaxing)
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0x78 (size before relaxing)
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*(.tcommon)
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0x0000000000600e10 PROVIDE (__init_array_start, .)
*(SORT(.init_array.*) SORT(.ctors.*))
*(.init_array EXCLUDE_FILE(*crtend?.o *crtend.o *crtbegin?.o *crtbegin.o) .ctors)
.init_array 0x0000000000600e10 0x8 /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o
0x0000000000600e18 PROVIDE (__init_array_end, .)
.fini_array 0x0000000000600e18 0x8
[!provide] PROVIDE (__fini_array_start, .)
*(SORT(.fini_array.*) SORT(.dtors.*))
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.fini_array 0x0000000000600e18 0x8 /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o
[!provide] PROVIDE (__fini_array_end, .)
.ctors
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*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
*(SORT(.ctors.*))
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.dtors
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*(SORT(.dtors.*))
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.data.rel.ro
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0x0000000000600e28 _DYNAMIC
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*(.got)
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*(.igot.plt)
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*(.data .data.* .gnu.linkonce.d.*)
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0x0000000000601030 __dso_handle
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.tm_clone_table
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.tm_clone_table
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.data1
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OUTPUT(gcc_create_map_file elf64-x86-64)
好了，本文对使用gcc生成map文件的方法就介绍到这里了，如有疑问的话，可以与博主联系哦。
审核编辑：汤梓红
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