56 lines
2.4 KiB
Diff
56 lines
2.4 KiB
Diff
From 6a0ce19ce1cb594cdec19bacc9fc7a38156e38da 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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The static libraries, however, must be build with LTO and non-LTO objects,
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as that will ensure the verify step will operate on IPO objects, if building
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those is requested by the system compiler flags.
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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 | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/Modules/FortranCInterface/CMakeLists.txt b/Modules/FortranCInterface/CMakeLists.txt
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index 13e4498ad9..ce0bc10c8e 100644
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--- a/Modules/FortranCInterface/CMakeLists.txt
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+++ b/Modules/FortranCInterface/CMakeLists.txt
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@@ -102,6 +102,19 @@ set_property(TARGET symbols PROPERTY POSITION_INDEPENDENT_CODE 1)
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add_executable(FortranCInterface main.F call_sub.f ${call_mod})
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target_link_libraries(FortranCInterface PUBLIC symbols)
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+# If IPO is enabled here, GCC gfortran >= 12.0 will obfuscate
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+# the strings of the return values in the compiled executable,
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+# which we use to regex match against later.
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+# The static libraries must be build with IPO and non-IPO objects,
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+# as that will ensure the verify step will operate on IPO objects,
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+# if requested by the system compiler flags.
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+if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" AND
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+ CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 12)
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+ target_compile_options(FortranCInterface PRIVATE "-fno-lto")
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+ target_compile_options(myfort PRIVATE "-flto=auto" "-ffat-lto-objects")
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+ target_compile_options(symbols PRIVATE "-flto=auto" "-ffat-lto-objects")
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+endif()
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+
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file(GENERATE OUTPUT exe-$<CONFIG>.cmake CONTENT [[
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set(FortranCInterface_EXE "$<TARGET_FILE:FortranCInterface>")
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]])
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--
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2.34.1
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