Linux Hello word!

Create a text file: Hello. cpp in the GCC folder of the root directory.

The content is as follows:

# Include <stdio. h>

Int main (void)
{
Printf ("Hello world! \ N ");
Return 0;
}

Application> attachment> terminal:

[Root @ localhost ~] # Cd gcc

Execute the compilation command:

[Root @ localhost GCC] # gcc-C hello. cpp-O hello

Run:

[Root @ localhost GCC] #./Hello
Bash:./Hello: insufficient Permissions

View permissions:

[Root @ localhost GCC] # ls-l

Total 16
-RW ------- 1 Root 77 10-30 16:33 hello. cpp
-RW ------- 1 Root 77 10-30 33 new file ~

Regenerate a generation extension (the extension is not important to Linux)

[Root @ localhost GCC] # gcc-C hello. cpp-O hello. o

[Root @ localhost GCC] #./Hello. o

Bash:./Hello. O: insufficient Permissions

Modify permissions for hello. O:

[Root @ localhost GCC] # chmod 777 hello. o

Execute again:

[Root @ localhost GCC] #./Hello. o

Bash:./Hello. O: cannot execute binary file

Output compilation details:

[Root @ localhost GCC] # gcc-V hello. cpp

Use built-in specs.
Goals: i386-redhat-linux
Configuration :.. /configure -- prefix =/usr -- Mandir =/usr/share/man -- infodir =/usr/share/info -- enable-shared -- enable-threads = POSIX -- enable-checking = release -- With-system-zlib -- enable-_ cxa_atexit -- disable-libunwind-exceptions -- enable-libgcj-Multifile -- enable-versions ages = C, c ++, objc, obj-C ++, Java, Fortran, ADA
-- Enable-Java-AWT = GTK -- disable-DSSI -- enable-plugin -- With-Java-home =/usr/lib/JVM/java-1.4.2-gcj-1.4.2.0/JRE -- With-CPU = generic -- host = i386-redhat-linux
Thread model: POSIX
GCC version 4.1.2 20080704 (Red Hat 4.1.2-48)
/Usr/libexec/GCC/i386-redhat-linux/4.1.2/cc1plus-quiet-v-d_gnu_source hello. CPP-quiet-dumpbase hello. CPP-mtune = generic-auxbase hello-version-O/tmp/ccp3falx. s
Ignore the nonexistent directory "/usr/lib/GCC/i386-redhat-linux/4.1.2/.../../i386-redhat-linux/include"
# Include "..." search starts from here:
# Include <...> search starts from here:
/Usr/lib/GCC/i386-redhat-linux/4.1.2/.../../include/C ++/4.1.2
/Usr/lib/GCC/i386-redhat-linux/4.1.2/.../../include/C ++/4.1.2/i386-redhat-linux
/Usr/lib/GCC/i386-redhat-linux/4.1.2/.../../include/C ++/4.1.2/backward
/Usr/local/include
/Usr/lib/GCC/i386-redhat-linux/4.1.2/include
/Usr/include
The search list ends.
Gnu c ++ version 4.1.2 20080704 (Red Hat 4.1.2-48) (i386-redhat-linux)
Compiled by gnu c version 4.1.2 20080704 (Red Hat 4.1.2-48.
GGC criterion: -- Param GGC-Min-expand = 98 -- Param GGC-Min-heapsize = 128356
Compiler executable checksum: e1c6e7e253b2b6b8ac8ef94463a3ee70
As-v-QY-O/tmp/ipv5uleo. O/tmp/ccp3falx. s
GNU extends er version 2.17.50.0.6-14. EL5 (i386-redhat-linux) using BFD version 2.17.50.0.6-14. EL5 20061020
/Usr/libexec/GCC/i386-redhat-linux/4.1.2/collect2 -- Eh-frame-HDR-M elf_i386 -- hash-style = GNU-dynamic-linker/lib/ld-linux.so.2/usr/lib/ gcc/i386-redhat-linux/4.1.2 /.. /.. /.. /crt1.o/usr/lib/GCC/i386-redhat-linux/4.1.2 /.. /.. /.. /crti. o/usr/lib/GCC/i386-redhat-linux/4.1.2/crtbegin. O
-L/usr/lib/GCC/i386-redhat-linux/4.1.2-L/usr/lib/GCC/i386-redhat-linux/4.1.2-L/usr/lib/GCC/i386-redhat-linux/4.1.2 /.. /.. /.. /tmp/ipv5uleo. o-lgcc -- as-needed-lgcc_s -- no-as-needed-LC-lgcc -- as-needed-lgcc_s -- no-as-needed/usr/lib/GCC/i386-redhat-linux/ 4.1.2/crtend. O
/Usr/lib/GCC/i386-redhat-linux/4.1.2/.../crtn. o
/Tmp/ipv5uleo. O :(. eh_frame + 0x11): Undefined reference to '_ gxx_personality_v0'

Collect2: LD returns 1

In the above output: Undefined reference to '_ gxx_personality_v0' is an error message!

I searched the internet and found the answer:

--------------------------------------------

7 floor excaliburxk

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[Report]

GCC determines how to process a file by its suffix.
GCC treats. C as a C-language source code file
Treat. C or. cc as C ++ source code
By default,. cpp files are not supported. You can change the file suffix or use the option to specify C ++ File Processing in the compilation command line.

Yankai0219, 6th Floor

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[Report]

The problem was not solved last night. I found it in the morning because
Because the extension name of the source code file does not match the syntax of the Code, for example, for a file using the C syntax, select a suffix name such as CPP (or <uppercase C> )". Solution: Change the suffix of. cpp to. C to solve the problem.

--------------------------------------------

Change hello. cpp to hello. C and recompile it:

[Root @ localhost GCC] # gcc-V hello. C-O hello. o

Use built-in specs.
Goals: i386-redhat-linux
Configuration :.. /configure -- prefix =/usr -- Mandir =/usr/share/man -- infodir =/usr/share/info -- enable-shared -- enable-threads = POSIX -- enable-checking = release -- With-system-zlib -- enable-_ cxa_atexit -- disable-libunwind-exceptions -- enable-libgcj-Multifile -- enable-versions ages = C, c ++, objc, obj-C ++, Java, Fortran, ADA
-- Enable-Java-AWT = GTK -- disable-DSSI -- enable-plugin -- With-Java-home =/usr/lib/JVM/java-1.4.2-gcj-1.4.2.0/JRE -- With-CPU = generic -- host = i386-redhat-linux
Thread model: POSIX
GCC version 4.1.2 20080704 (Red Hat 4.1.2-48)
/Usr/libexec/GCC/i386-redhat-linux/4.1.2/PC3-quiet-V hello. c-quiet-dumpbase hello. c-mtune = generic-auxbase hello-version-O/tmp/ccfqdbub. s
Ignore the nonexistent directory "/usr/lib/GCC/i386-redhat-linux/4.1.2/.../../i386-redhat-linux/include"
# Include "..." search starts from here:
# Include <...> search starts from here:
/Usr/local/include
/Usr/lib/GCC/i386-redhat-linux/4.1.2/include
/Usr/include
The search list ends.
Gnu c 4.1.2 20080704 (Red Hat 4.1.2-48) (i386-redhat-linux)
Compiled by gnu c version 4.1.2 20080704 (Red Hat 4.1.2-48.
GGC criterion: -- Param GGC-Min-expand = 98 -- Param GGC-Min-heapsize = 128356
Compiler executable checksum: 2da9a5b9b7fcbb90f7b2463be5d65b32
As-v-QY-O/tmp/ccedgpge. O/tmp/ccfqdbub. s
GNU extends er version 2.17.50.0.6-14. EL5 (i386-redhat-linux) using BFD version 2.17.50.0.6-14. EL5 20061020
/Usr/libexec/GCC/i386-redhat-linux/4.1.2/collect2 -- Eh-frame-HDR-M elf_i386 -- hash-style = GNU-dynamic-linker/lib/ld-linux.so.2-O hello. o/usr/lib/GCC/i386-redhat-linux/4.1.2 /.. /.. /.. /crt1.o/usr/lib/GCC/i386-redhat-linux/4.1.2 /.. /.. /.. /crti. o/usr/lib/GCC/i386-redhat-linux/4.1.2/crtbegin. O
-L/usr/lib/GCC/i386-redhat-linux/4.1.2-L/usr/lib/GCC/i386-redhat-linux/4.1.2-L/usr/lib/GCC/i386-redhat-linux/4.1.2 /.. /.. /.. /tmp/ccedgpge. o-lgcc -- as-needed-lgcc_s -- no-as-needed-LC-lgcc -- as-needed-lgcc_s -- no-as-needed/usr/lib/GCC/i386-redhat-linux/ 4.1.2/crtend. O
/Usr/lib/GCC/i386-redhat-linux/4.1.2/.../crtn. o

The above content does not have error information,

So run:

[Root @ localhost GCC] #./Hello. o

Hello world!

Finally, I came out! Amitabha!

[Root @ localhost GCC] #