cmake: Add a custom build type with the Fedora rpm compilation options.

Configuring a cmake build with the -DCMAKE_BUILD_TYPE=Fedora argument
will add all the compile/link arguments used by the Fedora build
system to the already specified arguments, except for the one that
adds rpm build notes to the metadata of a linked executable.  This
build type should allow for easy testing of whether a compile by the
fedora build team will fail.

README.CMake.md

@@ -201,6 +201,7 @@
      | Release        | -O3 -DNDEBUG     |
      | RelWithDebInfo | -O2 -g -DNDEBUG  |
      | MinSizeRel     | -Os -DNDEBUG     |
+     | Fedora         | <All Fedora build system options> |
 
   If no `CMAKE_BUILD_TYPE` value is supplied, the value of `Debug`
   will be used.

cmake/SetCompilerOptions.cmake

@@ -25,6 +25,11 @@ endif()
 # Always use position independent code.
 #
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+if(CMAKE_BUILD_TYPE MATCHES "([A-Za-z])(.*)")
+  string(TOUPPER ${CMAKE_MATCH_1} _INIT)
+  string(TOLOWER ${CMAKE_MATCH_2} _REST)
+  include(SetCompilerOptions${_INIT}${_REST} OPTIONAL)
+endif()
 
 #
 # Always used flags

cmake/SetCompilerOptionsFedora.cmake

@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2024 David Hampton
+#
+# See the file LICENSE_FSF for licensing information.
+#
+if(NOT CMAKE_C_COMPILER_ID STREQUAL GNU)
+  message(
+    FATAL_ERROR "The Fedora build type requires the use of the gcc compiler.")
+endif()
+
+set(CMAKE_C_FLAGS_FEDORA
+    "-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer"
+)
+set(CMAKE_CXX_FLAGS_FEDORA
+    "-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -mtls-dialect=gnu2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer"
+)
+set(CMAKE_EXE_LINKER_FLAGS_FEDORA
+    "-Wl,-z,relro -Wl,--as-needed  -Wl,-z,pack-relative-relocs -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1"
+)
+set(CMAKE_MODULE_LINKER_FLAGS_FEDORA "${CMAKE_EXE_LINKER_FLAGS_FEDORA}")
+set(CMAKE_SHARED_LINKER_FLAGS_FEDORA "${CMAKE_EXE_LINKER_FLAGS_FEDORA}")