Add info about LTO usage for Fortran; C++ projects can be linked as b…

…efore

manual/tracy.tex

@@ -441,7 +441,7 @@ \subsubsection{CMake integration}
 
 \begin{lstlisting}
 # set options before add_subdirectory
-# available options: TRACY_ENABLE, TRACY_ON_DEMAND, TRACY_NO_BROADCAST, TRACY_NO_CODE_TRANSFER, ...
+# available options: TRACY_ENABLE, TRACY_LTO, TRACY_ON_DEMAND, TRACY_NO_BROADCAST, TRACY_NO_CODE_TRANSFER, ...
 option(TRACY_ENABLE "" ON)
 option(TRACY_ON_DEMAND "" ON)
 add_subdirectory(3rdparty/tracy)  # target: TracyClient or alias Tracy::TracyClient
@@ -2406,6 +2406,20 @@ \subsubsection{First steps}
 target_link_libraries(<TARGET> PUBLIC Tracy::TracyClientF90)
 \end{lstlisting}
 
+For using Link-Time optimizations, link both \texttt{Tracy::TracyClient} and \texttt{Tracy::TracyClientF90} to any target where you use Tracy for profiling:
+
+\begin{lstlisting}
+target_link_libraries(<TARGET> PUBLIC Tracy::TracyClient Tracy::TracyClientF90)
+\end{lstlisting}
+
+\begin{bclogo}[
+noborder=true,
+couleur=black!5,
+logo=\bcbombe
+]{Important}
+The same compiler (vendor + version) must be used for LTO for \textbf{ALL} languages in project.
+\end{bclogo}
+
 \begin{bclogo}[
 noborder=true,
 couleur=black!5,
@@ -2434,6 +2448,12 @@ \subsubsection{First steps}
 \begin{lstlisting}
 target_link_libraries(<TARGET> PUBLIC TracyClientF90)
 \end{lstlisting}
+
+For using Link-Time optimizations (LTO), you also need to link with \texttt{TracyClient}:
+
+\begin{lstlisting}
+target_link_libraries(<TARGET> PUBLIC TracyClient TracyClientF90)
+\end{lstlisting}
 \end{bclogo}
 
 \paragraph{\texttt{tracy} module}