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6.2.1.1 Compilation for profiling

In order to profile a program the first step is to tell the compiler to generate the necessary profiling information. The compiler switch to be used is -pg, which must be added to other compilation switches. This switch needs to be specified both during compilation and link stages, and can be specified once when using gnatmake:

$ gnatmake -f -pg -P my_project

Note that only the objects that were compiled with the -pg switch will be profiled; if you need to profile your whole project, use the -f gnatmake switch to force full recompilation.

Note that on Windows, gprof does not support PIE. The -no-pie switch should be added to the linker flags to disable this feature.