SyntaxCheckCompilerFlag

Wiki Home
Syntax
Checks

• check_compile_flag
  • Adding a Compiler Flag
  • Examples
  • Attributes

check_compile_flag

Checks to see if a compiler flag is valid, and if so, adds it to CFLAGS for the current profile.

check_compile_flag '-Wmissing-prototypes';
check_compile_flag '-Wno-missing-prototypes' { negate; }

Because gcc will not create a warning or error when a compiler flag is prefixed with '-Wno-', it is necessary to check the compiler flag without the '-Wno-' prefix. To do this, append a statement block to the check, and add the negate attribute.

But be aware that some warning flags such as '-Wno-poison-system-directories' for MacOS/clang do not have an opposite and cannot be tested with the negate attribute.

Generated Name: Prefix: cf_
The leading '-' or '-W' is removed from the name.
Example: cf_missing_prototypes

Adding a Compiler Flag

add-compile-flag '-DNO_DEPRECATED';

Adds a compiler flag without any validation.

Examples

check_compile_flag '-Wall';
check_compile_flag '-Wformat';

Attributes

• header
• name
• negate
• compiler_flags

Wiki Home
Syntax
Checks