57 lines
2.1 KiB
CMake
57 lines
2.1 KiB
CMake
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#
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# tuklib_gnu_c_attributes.cmake - Checks for GNU C attributes
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#
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# Author: Lasse Collin
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#
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# This file has been put into the public domain.
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# You can do whatever you want with this file.
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#
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include("${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake")
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include(CheckCSourceCompiles)
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# This is a helper function for the actual attribute tests.
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function(tuklib_check_attribute CODE RESULT)
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# GCC, Clang, ICC, Solaris Studio, and XLC don't exit with
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# a non-zero exit status if an unknown attribute is provided.
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# They only print a warning. Accept the attribute only if no
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# attribute-related warnings were issued.
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#
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# - XLC doesn't use the lower-case string "warning".
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# It might use "WARNING" on z/OS or "(W)" on AIX.
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# So "warning" isn't checked.
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#
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# - A few XLC messages use "Attribute" instead of "attribute".
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#
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# - ICC doesn't use the word "ignored".
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#
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# The problem with this method is that the regex might become
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# outdated with newer compiler versions. Using -Werror would be
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# an alternative but it fails if warnings occur for reasons other
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# than unsupported attribute.
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#
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# The first pattern is for GCC, Solaris Studio, and XLC.
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# The second one is for ICC. Both patterns work with Clang.
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# Matching the leading space or colon reduces chances of
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# matching any unrelated messages.
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check_c_source_compiles("${CODE} int main(void) { return 0; }" "${RESULT}"
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FAIL_REGEX " [Aa]ttribute .* ignored"
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": unknown attribute")
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endfunction()
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function(tuklib_check_func_attribute_constructor RESULT)
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tuklib_check_attribute("
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__attribute__((__constructor__))
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void my_constructor_func(void) { return; }
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" "${RESULT}")
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endfunction()
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function(tuklib_check_func_attribute_ifunc RESULT)
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tuklib_check_attribute("
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static void func(void) { return; }
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static void (*resolve_func(void))(void) { return &func; }
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void func_ifunc(void)
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__attribute__((__ifunc__(\"resolve_func\")));
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" "${RESULT}")
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endfunction()
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