fix: for now external math lib is needed

For `sinf`, `cosf` and `expf`.

.github/workflows/test.yaml

@@ -37,7 +37,7 @@ jobs:
           languages: c-cpp
       - name: test
         run: |
-          clang -std=gnu99 src/make.c -o make
+          clang -std=gnu99 src/make.c -lm -static -o make
           ./make check
       - name: analyze
         uses: github/codeql-action/analyze@v3

README.org

@@ -111,7 +111,7 @@ tar -xvf carbon-0.7-linux-amd64.tgz
 If wanted to build /Carbon/ from source independently (i.e. without defining ~CARBON_IMPLEMENTATION~ in your code), it can be done without any problems. We use a custom ~make~ utility (which uses /Carbon/ under the hood) as our build system to manage cleaning, compiling and packaging the library.
 
 #+begin_src sh
-cc -std=gnu99 src/make.c -o make
+cc -std=gnu99 src/make.c -lm -static -o make
 #+end_src
 
 One built, we can take a look at the available subcommands: