Implement the %build_type_safety_c macro (#2218019)
The default remains at 0 (no change) until the corresponding Fedora change proposal is accepted: <https://fedoraproject.org/wiki/Changes/GNUToolchainF39>
This commit is contained in:
Florian Weimer
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7692bbaf45
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246107d5f6
@ -114,6 +114,55 @@ or:
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BuildRequires: clang compiler-rt
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%endif
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### Controlling Type Safety
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The macro `%build_type_safety_c` can be set to change the C type
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safety level. By default (value 0), all C constructs that GCC accepts
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for backwards compatibility with obsolete language standards are
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accepted during package builds. Packages can set
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`%build_type_safety_c` to higher values to adopt future
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distribution-wide type-safety increases early.
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When changing the `%build_type_safety_c` level to increase it, spec
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file should use a construct like this to avoid *lowering* a future
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default:
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```
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%if %build_type_safety_c < 2
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%global %build_type_safety_c 2
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%endif
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```
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At level 1, the following additional error categories are enabled:
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* `-Werror=implicit-int`: Reject declarations and definitions that
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omit a type name where one is required. Examples are:
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`extern int_variable;`, `extern int_returning_function (void);`,
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and missing separate parameter type declarations in old-style
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function definitions.
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* `-Werror=implicit-function-declaration`: Reject calls to functions
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to undeclared functions such as `function_not_defined_anywhere ()`.
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Previously, such expressions where we compiled as if a declaration
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`extern int function_not_defined_anywhere ();` (a prototype-less
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function declaration) were in scope.
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At level 2, the following error category is enabled in addition:
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* `-Werror=int-conversion`: Reject the use of integer expressions
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where a pointer type expected, and pointer expressions where an
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integer type is expected. Without this option, GCC may produce an
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executable, but often, there are failures at run time because not
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the full 64 bits of pointers are preserved.
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The additional level 3 error category is:
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* `-Werror=incompatible-pointer-types`: An expression of one pointer
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type is used where different pointer type is expected. (This does
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not cover signed/unsigned mismatches in the pointer target type.)
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Clang errors out on more obsolete and invalid C constructs than C, so
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the type safety is higher by default than with the GCC toolchain.
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### Disable autotools compatibility patching
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By default, the invocation of the `%configure` macro replaces
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@ -416,6 +465,7 @@ The general (architecture-independent) build flags are:
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This can occasionally result in compilation errors. In that case,
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the best option is to rewrite the source code so that only constant
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format strings (string literals) are used.
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* Other `-Werror=` options. See **Controlling C Type Safety**.
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* `-U_FORTIFY_SOURCE, -Wp,-U_FORTIFY_SOURCE -Wp,-D_FORTIFY_SOURCE=3`:
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See the Source Fortification section above and the `%_fortify_level`
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override.
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6
macros
6
macros
@ -384,12 +384,16 @@ print(result)
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%_fortify_level 3
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%_fortify_level_flags %[ 0%{?_fortify_level} > 0 ? "-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=%{_fortify_level}" : "" ]
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# This can be set to a positive integer to obtain increasing type
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# safety levels for C. See buildflags.md.
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%build_type_safety_c 0
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# Some linkers default to a build-id algorithm that is not supported by rpmbuild,
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# so we need to specify the right algorithm to use.
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%_build_id_flags -Wl,--build-id=sha1
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%_general_options -O2 %{?_lto_cflags} -fexceptions -g -grecord-gcc-switches -pipe
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%_warning_options -Wall%[%__build_for_lang_any ? " -Wno-complain-wrong-lang" : ""]%[%__build_for_lang_c + %__build_for_lang_cxx ? " -Werror=format-security" : ""]
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%_warning_options -Wall%[%__build_for_lang_any ? " -Wno-complain-wrong-lang" : ""]%[%__build_for_lang_c + %__build_for_lang_cxx ? " -Werror=format-security" : ""]%[%__build_for_lang_c && (%build_type_safety_c >= 1) ? " -Werror=implicit-function-declaration -Werror=implicit-int" : ""]%[%__build_for_lang_c && (%build_type_safety_c >= 2) ? " -Werror=int-conversion" : ""]%[%__build_for_lang_c && (%build_type_safety_c >= 3) ? " -Werror=incompatible-pointer-types" : ""]
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%_preprocessor_defines %{_fortify_level_flags} -Wp,-D_GLIBCXX_ASSERTIONS
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# Common variables are no longer generated by default by gcc and clang
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@ -4,7 +4,7 @@
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# 2) When making changes, increment the version (in baserelease) by 1.
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# rpmdev-bumpspec and other tools update the macro below, which is used
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# in Version: to get the desired effect.
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%global baserelease 259
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%global baserelease 260
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Summary: Red Hat specific rpm configuration files
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Name: redhat-rpm-config
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@ -254,6 +254,9 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora/srpm forge.lua
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%doc buildflags.md
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%changelog
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* Wed Jul 5 2023 Florian Weimer <fweimer@redhat.com> - 260-1
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- Implement the %%build_type_safety_c macro (#2218019)
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* Wed Jul 5 2023 Florian Weimer <fweimer@redhat.com> - 259-1
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- Filter out C, C++ build flags from Fortran build flags (#2177253)
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