diff options
Diffstat (limited to 'Help/guide/tutorial/Step9/MathFunctions')
| -rw-r--r-- | Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt | 6 | ||||
| -rw-r--r-- | Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt index c8cd1dd..b4d337b 100644 --- a/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt +++ b/Help/guide/tutorial/Step9/MathFunctions/CMakeLists.txt @@ -26,6 +26,12 @@ target_include_directories(MathFunctions # and that anything that links to use will get this define target_compile_definitions(MathFunctions INTERFACE "USE_MYMATH") +# does this system provide the log and exp functions? +include(CheckSymbolExists) +set(CMAKE_REQUIRED_LIBRARIES "m") +check_symbol_exists(log "math.h" HAVE_LOG) +check_symbol_exists(exp "math.h" HAVE_EXP) + if(HAVE_LOG AND HAVE_EXP) target_compile_definitions(MathFunctions PRIVATE "HAVE_LOG" "HAVE_EXP") diff --git a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx index 8b82141..2b1d889 100644 --- a/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx +++ b/Help/guide/tutorial/Step9/MathFunctions/mysqrt.cxx @@ -16,8 +16,8 @@ double mysqrt(double x) // if we have both log and exp then use them #if defined(HAVE_LOG) && defined(HAVE_EXP) double result = exp(log(x) * 0.5); - std::cout << "Computing sqrt of " << x << " to be " << result << " using log" - << std::endl; + std::cout << "Computing sqrt of " << x << " to be " << result + << " using log and exp" << std::endl; #else // use the table to help find an initial value double result = x; |