Clean between runs in the make parameter-scan example

CHANGELOG.md

@@ -247,7 +247,7 @@ Package authors: note that Hyperfine now comes with a set of shell completion fi
   necessarily required numeric arguments.
 
   ``` bash
-  hyperfine --parameter-list compiler "g++,clang++" \
+  hyperfine --parameter-list compiler "gcc,clang" \
       "{compiler} -O2 main.cpp"
   ```
 

README.md

@@ -84,7 +84,7 @@ This runs `sleep 0.3`, `sleep 0.5` and `sleep 0.7`.
 For non-numeric parameters, you can also supply a list of values with the `-L`/`--parameter-list`
 option:
 ```
-hyperfine -L compiler g++,clang++ '{compiler} -O2 main.cpp'
+hyperfine -L compiler gcc,clang '{compiler} -O2 main.cpp'
 ```
 
 ### Intermediate shell

doc/hyperfine.1

@@ -141,7 +141,7 @@ string '{\fIVAR\fP}' in each command by the current parameter value.
 .RS
 Example:
 .RS
-\fBhyperfine\fR \fB\-P\fR threads 1 8 'make \-j {threads}'
+\fBhyperfine\fR \fB\-\-prepare\fR 'make clean' \fB\-P\fR threads 1 8 'make \-j {threads}'
 .RE
 .RE
 .IP
@@ -184,11 +184,11 @@ Replaces the string '{\fIVAR\fP}' in each command by the current parameter value
 .RS
 Example:
 .RS
-\fBhyperfine\fR \fB\-L\fR compiler g++,clang++ '{compiler} \-O2 main.cpp'
+\fBhyperfine\fR \fB\-L\fR compiler gcc,clang '{compiler} \-O2 main.cpp'
 .RE
 .RE
 .IP
-This performs benchmarks for 'g++ \-O2 main.cpp' and 'clang++ \-O2 main.cpp'.
+This performs benchmarks for 'gcc \-O2 main.cpp' and 'clang \-O2 main.cpp'.
 .IP
 The option can be specified multiple times to run benchmarks for all
 possible parameter combinations.

src/cli.rs

@@ -161,7 +161,7 @@ fn build_command() -> Command {
                 .help(
                     "Perform benchmark runs for each value in the range MIN..MAX. Replaces the \
                      string '{VAR}' in each command by the current parameter value.\n\n  \
-                     Example:  hyperfine -P threads 1 8 'make -j {threads}'\n\n\
+                     Example:  hyperfine --prepare 'make clean' -P threads 1 8 'make -j {threads}'\n\n\
                      This performs benchmarks for 'make -j 1', 'make -j 2', …, 'make -j 8'.\n\n\
                      To have the value increase following different patterns, use shell arithmetics.\n\n  \
                      Example: hyperfine -P size 0 3 'sleep $((2**{size}))'\n\n\
@@ -194,8 +194,8 @@ fn build_command() -> Command {
                 .help(
                     "Perform benchmark runs for each value in the comma-separated list VALUES. \
                      Replaces the string '{VAR}' in each command by the current parameter value\
-                     .\n\nExample:  hyperfine -L compiler g++,clang++ '{compiler} -O2 main.cpp'\n\n\
-                     This performs benchmarks for 'g++ -O2 main.cpp' and 'clang++ -O2 main.cpp'.\n\n\
+                     .\n\nExample:  hyperfine -L compiler gcc,clang '{compiler} -O2 main.cpp'\n\n\
+                     This performs benchmarks for 'gcc -O2 main.cpp' and 'clang -O2 main.cpp'.\n\n\
                      The option can be specified multiple times to run benchmarks for all \
                      possible parameter combinations.\n"
                 ),