Updated solc setup and instructions (Uniswap#406)

* Added contribution instructions

* missing space

* Updated solc config

.env

@@ -1,7 +1,7 @@
 FOUNDRY_FUZZ_SEED=0x4444
 
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
-        FOUNDRY_SOLC="./bin/solc-static-linux"
+        export FOUNDRY_SOLC="./bin/solc-static-linux"
 elif [[ "$OSTYPE" == "darwin"* ]]; then
-        FOUNDRY_SOLC="./bin/solc-mac"
+        export FOUNDRY_SOLC="./bin/solc-mac"
 fi

CONTRIBUTING.md

@@ -50,9 +50,17 @@ Run `source .env` to set FOUNDRY_SOLC to the correct solc binary.
 
 `forge build` to get contract artifacts and dependencies for forge
 
+If after running `source .env`, you continue to get the error `Function "tload" not found.` try running
+
+On MacOS:
+`forge build --use ./bin/solc-mac`
+
+On Linux:
+`forge build --use ./bin/solc-static-linux`
+
 ## Tests
 
-`forge snapshot`to update the forge gas snapshots. Note these must use a static fuzz seed, so please `source .env`, use `FOUNDRY_FUZZ_SEED=0x4444`, or use `just snapshots` when running forge snapshots.
+`forge snapshot` to update the forge gas snapshots. Note these must use a static fuzz seed, so please run `source .env`, use `FOUNDRY_FUZZ_SEED=0x4444`, or use `just snapshots` when running forge snapshots.
 
 `forge test` to run forge tests
 

foundry.toml

@@ -1,5 +1,4 @@
 [profile.default]
-solc_version = '0.8.22'
 optimizer_runs = 800
 via_ir = false
 ffi = true