Friday, 19 August 2011

Which version of the GCC compiled my program?

Here's a quick one-liner to find out which version of GCC was used to compile some code:

readelf -p .comment a.out

String dump of section '.comment':
  [     0]  GCC: (Ubuntu/Linaro 4.6.1-7ubuntu1) 4.6.1
  [    2a]  GCC: (Ubuntu/Linaro 4.6.1-6ubuntu6) 4.6.1
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2 comments:

  1. Anonymous19 August 2011 at 11:21

    most apps and libs on a running system do not have the sections that contain that info from what I saw so far

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  2. Colin Ian King22 August 2011 at 08:45

    Well, it is also very useful for checking the compiler used to compile kernel modules..

    readelf -p .comment /lib/modules/2.6.38-10-generic/kernel/drivers/acpi/video.ko

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