Hi,
In both `go build main.go`-examples, you tell the compiler to _only_
build `main.go`.
In your first example, `main.go` probably imports both `util` and `lib`
(you might want to give them less generic names by the way). The go
compiler thus knows "to build `main.go`, I need to build both `util` and
`lib` and link them in".
In the second example, it has no way of knowing where `load_pattern_db`
comes from, since you didn't tell it to compile a file that defines that
function.
The examples where you omit the `main.go` tell the compiler "build the
package in this directory", which includes all `.go`-files in the
directory. `node.c` and `node.h` are likely built because of `cgo`
directives in `a.go`.
The compiler and linker did exactly as you told them to.
On 18.03.20 14:17, Nitish Saboo wrote:
Hi,
*Case 1
----------
*
I have a project called 'nitish' where the folder structure looks like
the following:
nitish
main.go
util
util.go
lib
node.c
node.h
a.go
When I try compiling this project in the following ways:
1) go build -v - x
>> This creates a binary called 'nitish'
2) go build -v - x main.go
>> This creates a binary called 'main'
ldd output of both the binaries is the same.
*Case 2
----------*
Now, when I restructure the project 'nitish' in the following manner:
nitish
main.go
util.go
node.c
node.h
a.go
When I try compiling this project in the following ways:
1) go build -v - x
>> This creates a binary called 'nitish'
2) go build -v - x main.go
>> This error out with the following:
/tmp/go-build074530518/b001/_x002.o: In function
`_cgo_8eab385aa676_Cfunc_load_pattern_db':
/tmp/go-build/cgo-gcc-prolog:86: undefined reference to `load_pattern_db'
collect2: error: ld returned 1 exit status
1) In Case 1, why the binaries are created with different names though
both the binaries have the same 'ldd output' and work the same manner?
2) Why we see an error with the command 'go build -v - x main.go' in
Case 2 but not in Case 1?
Thanks,
Nitish
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