I use embedded system. After the C source code building I get many files. The file name is the same, but the extension is different:
.s37 .elf .hex .sig
What is the differences between them? Mainly what is the differences between .s37 and .elf?
differences between s37 and elf files
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Those are just different executable formats.
.s37 is one variant of SREC format, it's ascii/line fixed text including hex (binary)
This format is well known by flash/upload software in most embedded targets.
.elfis an executable & linkable file, product of a linker likegccor other commercial compilers (Windriver, CodeWarrior...)..elfformat is hardly uploadable on embedded targets without conversion to.SRECwithobjcopyfirst. One of the main differences in contents is that.elfformat can contain debugging symbols, whereas.srec/.s37cannot.My guess is that your toolchain does it all: link: .elf, then objcopy to convert .elf to .s3 for target upload (losing symbol information if any, which requires you to keep the
.elffile handy when debugging your application on the target, the SREC file contains only code & data, no debug).S3 format can't contain symbols. They're discarded, even using a simple
objcopycommand. That format is only useful to contain code/data to upload on a target.