Simplify paths in C test runner output

Programming C
1

In a Discord #get-help thread, I noticed the C test runner uses absolute paths in its message. I’d like to propose simplifying the reported paths per The Test Runner Interface | Exercism's Docs.

Original Output 
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `main':
/mnt/exercism-iteration/./test_leap.c:59: multiple definition of `main'; /tmp/ccAeFFaB.o:/mnt/exercism-iteration/./leap.c:6: first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `test_year_not_divisible_by_4_in_common_year':
/mnt/exercism-iteration/./test_leap.c:14:(.text+0x18): undefined reference to `leap_year'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_2_not_divisible_by_4_in_common_year':
/mnt/exercism-iteration/./test_leap.c:19:(.text+0x44): undefined reference to `leap_year'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_4_not_divisible_by_100_in_leap_year':
/mnt/exercism-iteration/./test_leap.c:24:(.text+0x70): undefined reference to `leap_year'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_4_and_5_is_still_a_leap_year':
/mnt/exercism-iteration/./test_leap.c:29:(.text+0x99): undefined reference to `leap_year'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_100_not_divisible_by_400_in_common_year':
/mnt/exercism-iteration/./test_leap.c:34:(.text+0xc2): undefined reference to `leap_year'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccalHfIF.o:/mnt/exercism-iteration/./test_leap.c:40: more undefined references to `leap_year' follow
collect2: error: ld returned 1 exit status
make: *** [makefile:37: tests.out] Error 1

becomes something like

Updated Output 
ld: /tmp/ccalHfIF.o: in function `main':
test_leap.c:59: multiple definition of `main'; leap.c:6: first defined here
ld: /tmp/ccalHfIF.o: in function `test_year_not_divisible_by_4_in_common_year':
test_leap.c:14:(.text+0x18): undefined reference to `leap_year'
ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_2_not_divisible_by_4_in_common_year':
test_leap.c:19:(.text+0x44): undefined reference to `leap_year'
ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_4_not_divisible_by_100_in_leap_year':
test_leap.c:24:(.text+0x70): undefined reference to `leap_year'
ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_4_and_5_is_still_a_leap_year':
test_leap.c:29:(.text+0x99): undefined reference to `leap_year'
ld: /tmp/ccalHfIF.o: in function `test_year_divisible_by_100_not_divisible_by_400_in_common_year':
test_leap.c:34:(.text+0xc2): undefined reference to `leap_year'
ld: test_leap.c:40: more undefined references to `leap_year' follow
collect2: error: ld returned 1 exit status
make: *** [makefile:37: tests.out] Error 1
2

I experimented around in makefile a bit.
Full paths to .c source files: the -g flag in makefile seems to have something to do with forcing full path. Could be “fixed” by getting rid of -g flag, but we might need that for something.
This doesnt fix full paths to cc and ld. Maybe CC and LD can be defined in the makefile to local commands?

3

The -g flag add debug information to the binary (see the documentation).

4

I’ve used sed to replace parts of file paths in the test runner output on other tracks, and that seems to be a fairly unobtrusive band-aid fix.

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