59 lines
1.6 KiB
CMake
59 lines
1.6 KiB
CMake
# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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INCLUDE(CheckCSourceRuns)
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INCLUDE(CheckCXXSourceRuns)
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SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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SET(CMAKE_REQUIRED_FLAGS
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"${CMAKE_REQUIRED_FLAGS} -O3 -fexpensive-optimizations"
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)
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# Below code is known to fail for GCC 5.3.0 on sparc solaris 11.
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67781
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SET(code "
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struct X
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{
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int i;
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unsigned short s;
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};
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unsigned __attribute__((noinline)) f(struct X x)
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{
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return x.s | (x.i << 16);
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}
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int
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main()
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{
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struct X x;
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x.i = 0x00001234;
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x.s = 0x5678;
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unsigned y = f(x);
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/* Succeed (return 0) if compiler have bug */
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return y == 0x12345678 ? 1 : 0;
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}
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")
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IF(CMAKE_COMPILER_IS_GNUCC)
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CHECK_C_SOURCE_RUNS("${code}" HAVE_C_SHIFT_OR_OPTIMIZATION_BUG)
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ENDIF()
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IF(CMAKE_COMPILER_IS_GNUCXX)
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CHECK_CXX_SOURCE_RUNS("${code}" HAVE_CXX_SHIFT_OR_OPTIMIZATION_BUG)
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ENDIF()
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SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
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