Hello, the attached patch switches libgfortran C sources to be compiled in gnu11 mode instead of gnu99. As the 4.9 release notes http://gcc.gnu.org/gcc-4.9/changes.html say,
"ISO C11 support is now at a similar level of completeness to ISO C99 support: substantially complete modulo bugs, extended identifiers (supported except for corner cases when -fextended-identifiers is used), floating-point issues (mainly but not entirely relating to optional C99 features from Annexes F and G) and the optional Annexes K (Bounds-checking interfaces) and L (Analyzability)." An overview of new features in C11 can be seen e.g. at https://en.wikipedia.org/wiki/C11_%28C_standard_revision%29 And the current status of C11 support in GCC is at http://gcc.gnu.org/wiki/C11Status Similar to the case of C99 support, we cannot rely on the new library features being present, but the language features can be used, e.g. _Noreturn, _Static_assert, anonymous structs and unions could potentially be useful for libgfortran. Since libgfortran is compiled by the stage 3 compiler, there shouldn't be any bootstrapping issues wrt. older (stage 1) compilers. Ok for trunk? 2014-05-01 Janne Blomqvist <j...@gcc.gnu.org> * configure.ac (AM_CFLAGS): Use -std=gnu11. (CFLAGS): Likewise. * configure: Regenerated. -- Janne Blomqvist
diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac index 24dbf2b..2126285 100644 --- a/libgfortran/configure.ac +++ b/libgfortran/configure.ac @@ -139,12 +139,13 @@ AM_PROG_CC_C_O # Add -Wall -fno-repack-arrays -fno-underscoring if we are using GCC. if test "x$GCC" = "xyes"; then AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring" - ## We like to use C99 routines when available. This makes sure that + ## We like to use C11 and C99 routines when available. This makes + ## sure that ## __STDC_VERSION__ is set such that libc includes make them available. - AM_CFLAGS="-std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wextra -Wwrite-strings" + AM_CFLAGS="-std=gnu11 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -Wextra -Wwrite-strings" ## Compile the following tests with the same system header contents ## that we'll encounter when compiling our own source files. - CFLAGS="-std=gnu99 $CFLAGS" + CFLAGS="-std=gnu11 $CFLAGS" fi AC_SUBST(AM_FCFLAGS) AC_SUBST(AM_CFLAGS)
