1 files changed, 72 insertions, 0 deletions
diff --git a/debian/patches/gcc-distro-specs-ubuntu-doc.diff b/debian/patches/gcc-distro-specs-ubuntu-doc.diff
new file mode 100644
index 0000000..e7f4bc5
--- /dev/null
+++ b/debian/patches/gcc-distro-specs-ubuntu-doc.diff
@@ -0,0 +1,72 @@
+# DP: Document distro specific compiler flags turned on by default
+
+--- a/src/gcc/doc/invoke.texi
++++ b/src/gcc/doc/invoke.texi
+@@ -11859,6 +11859,13 @@ also turns on the following optimization
+ Please note the warning under @option{-fgcse} about
+ invoking @option{-O2} on programs that use computed gotos.
+ 
++NOTE: In Ubuntu 8.10 and later versions, @option{-D_FORTIFY_SOURCE=2},
++in Ubuntu 24.04 and later versions, @option{-D_FORTIFY_SOURCE=3}, is
++set by default, and is activated when @option{-O} is set to 2 or higher.
++This enables additional compile-time and run-time checks for several libc
++functions.  To disable, specify either @option{-U_FORTIFY_SOURCE} or
++@option{-D_FORTIFY_SOURCE=0}.
++
+ @opindex O3
+ @item -O3
+ Optimize yet more.  @option{-O3} turns on all optimizations specified
+@@ -15421,6 +15428,9 @@ value of a shared integer constant.
+ The minimum size of buffers (i.e.@: arrays) that receive stack smashing
+ protection when @option{-fstack-protector} is used.
+ 
++This default before Ubuntu 10.10 was "8". Currently it is "4", to increase
++the number of functions protected by the stack protector.
++
+ @item min-size-for-stack-sharing
+ The minimum size of variables taking part in stack slot sharing when not
+ optimizing.
+@@ -17127,6 +17137,10 @@ Currently the x86 GNU/Linux target provi
+ on Intel Control-flow Enforcement Technology (CET) which works for
+ i686 processor or newer.
+ 
++NOTE: In Ubuntu 19.10 and later versions, @option{-fcf-protection}
++is enabled by default for C, C++, ObjC, ObjC++, if none of
++@option{-fno-cf-protection} nor @option{-fcf-protection=*} are found.
++
+ @opindex fharden-compares
+ @item -fharden-compares
+ For every logical test that survives gimple optimizations and is
+@@ -17169,6 +17183,11 @@ references to local frame addresses.  On
+ allocated on the stack are considered, optimized away variables or variables
+ allocated in registers don't count.
+ 
++NOTE: In Ubuntu 14.10 and later versions,
++@option{-fstack-protector-strong} is enabled by default for C,
++C++, ObjC, ObjC++, if none of @option{-fno-stack-protector},
++@option{-nostdlib}, nor @option{-ffreestanding} are found.
++
+ @opindex fstack-protector-explicit
+ @item -fstack-protector-explicit
+ Like @option{-fstack-protector} but only protects those functions which
+@@ -17232,6 +17251,10 @@ allocations.  @option{-fstack-clash-prot
+ protection for static stack allocations if the target supports
+ @option{-fstack-check=specific}.
+ 
++NOTE: In Ubuntu 19.10 and later versions,
++@option{-fstack-clash-protection} is enabled by default for C,
++C++, ObjC, ObjC++, unless @option{-fno-stack-clash-protection} is found.
++
+ @opindex fstack-limit-register
+ @opindex fstack-limit-symbol
+ @opindex fno-stack-limit
+@@ -17959,6 +17982,9 @@ For example, @option{-Wl,-Map,output.map
+ linker.  When using the GNU linker, you can also get the same effect with
+ @option{-Wl,-Map=output.map}.
+ 
++NOTE: In Ubuntu 8.10 and later versions, for LDFLAGS, the option
++@option{-Wl,-z,relro} is used.  To disable, use @option{-Wl,-z,norelro}.
++
+ @opindex u
+ @item -u @var{symbol}
+ Pretend the symbol @var{symbol} is undefined, to force linking of