_FORTIFY_SOURCE requires compiling with optimization (-O)

[netllama]

On a Fedora36 system, attempting to run the make command throws a large number of warnings such as the following:

[ 80%] Building CXX object CMakeFiles/camhal_static.dir/modules/ia_cipr/src/Command.cpp.o
In file included from /usr/include/c++/12/x86_64-redhat-linux/bits/os_defines.h:39,
                 from /usr/include/c++/12/x86_64-redhat-linux/bits/c++config.h:2892,
                 from /usr/include/c++/12/bits/stl_algobase.h:59,
                 from /usr/include/c++/12/vector:60,
                 from /root/stuff/ipu6-camera-hal/modules/ia_cipr/include/Command.h:19,
                 from /root/stuff/ipu6-camera-hal/modules/ia_cipr/src/Command.cpp:19:
/usr/include/features.h:412:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
  412 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
      |    ^~~~~~~

This patch makes the failures go away, but I don't understand whether there will be performance impact as a result of the change:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a930feb..a79682f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,7 +83,7 @@ set (CMAKE_CXX_STANDARD 11)
 add_compile_options(-Wall -Werror
                     -fstack-protector
                     -fPIE -fPIC
-                    -D_FORTIFY_SOURCE=2
+                    -D_FORTIFY_SOURCE=0
                     -DDCHECK_ALWAYS_ON
                     -Wformat -Wformat-security
                     )

[hao-yao]

@netllama Did you build with -DCMAKE_BUILD_TYPE=Release? It sets compiler option -O2 which is needed by D_FORTIFY_SOURCE=2.

[netllama]

@hao-yao i ran make with no other options or variables.

[cbarbu]

Same error here. Adding -DCMAKE_BUILD_TYPE=Release in build.sh, function build_hal_adaptor() {

so that cmake call looks like

command cmake -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR/install ../

Allowed to compile smoothly build_hal_adaptor