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Gentoo's toolchain always sets F_S (level 2 at minimum) by default.
https://bugs.gentoo.org/890072
--- a/cmake/modules/DefineCompilerFlags.cmake
+++ b/cmake/modules/DefineCompilerFlags.cmake
@@ -47,12 +47,6 @@ if (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
if (CMAKE_BUILD_TYPE)
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
- if (CMAKE_BUILD_TYPE_LOWER MATCHES "(release|relwithdebinfo|minsizerel)" AND (NOT ${CMAKE_C_FLAGS} MATCHES "FORTIFY_SOURCE=[3-9]"))
- check_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" WITH_FORTIFY_SOURCE)
- if (WITH_FORTIFY_SOURCE)
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
- endif (WITH_FORTIFY_SOURCE)
- endif()
endif()
endif (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -31,10 +31,6 @@ if(NOT MSVC)
endif()
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
- if(CMAKE_BUILD_TYPE_LOWER MATCHES "(release|relwithdebinfo|minsizerel)" AND ((NOT ${CMAKE_C_FLAGS} MATCHES "FORTIFY_SOURCE=[3-9]") AND (NOT ${CMAKE_CXX_FLAGS} MATCHES "FORTIFY_SOURCE=[3-9]")))
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_FORTIFY_SOURCE=2")
- set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_FORTIFY_SOURCE=2")
- endif()
if (CMAKE_CXX_COMPILER MATCHES "Clang")
# Calling Qt's qCWarning(category, ...) with no params for "..." is a GNU
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