50 lines
2.0 KiB
Diff
50 lines
2.0 KiB
Diff
From 5ec4aa48f7fb0a6ab4b1385e5512527ecb24f588 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
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Date: Wed, 19 Jan 2022 17:26:14 +0100
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Subject: [PATCH] FortranCInterface: Fix compatibility with GCC gfortran 12 LTO
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Since version 12.0 the GCC Fortran compiler has implemented "WG5/N1942",
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which causes, if link-time opmization is enabled, obfuscation of hard-coded
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string values in the compiler objects and its resulting ELF-binaries.
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This causes the CMake-internal detection of the mangling scheme for the
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naming of subroutines to fail. Thus we must ensure to have any link-time
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optimization features to be disabled on the executable file we perform the
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detection on.
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Fixes: #23123
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Signed-off-by: Björn Esser <besser82@fedoraproject.org>
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---
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Modules/FortranCInterface/CMakeLists.txt | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/Modules/FortranCInterface/CMakeLists.txt b/Modules/FortranCInterface/CMakeLists.txt
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index 13e4498ad9..6bbb753042 100644
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--- a/Modules/FortranCInterface/CMakeLists.txt
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+++ b/Modules/FortranCInterface/CMakeLists.txt
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@@ -5,6 +5,17 @@ cmake_minimum_required(VERSION ${CMAKE_VERSION})
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project(FortranCInterface C Fortran)
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include(${FortranCInterface_BINARY_DIR}/Input.cmake OPTIONAL)
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+# If IPO is enabled here, GCC gfortran >= 12.0 will obfuscate
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+# the strings of the return values in the compiled executable,
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+# which we use to regex match against later.
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+if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" AND
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+ CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 12)
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+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-lto")
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+ set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fno-lto")
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+ set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -fno-lto")
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+ set(CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -fno-lto")
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+endif()
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+
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# Check if the C compiler supports '$' in identifiers.
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include(CheckCSourceCompiles)
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check_c_source_compiles("
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--
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2.34.1
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