35de7e9008
Add support for --enable-devel and similar macros. * m4/debug.m4: Rename to ... * m4/bdebug.m4: ... this. * m4/debug.m4, m4/devel.m4, m4/gccoptim.m4, m4/ndebug.m4: New file. * m4/gccwarns.m4: Fix usage of cache variable. Fix shell syntax. Do not check for -Waggregate-return. Update CFLAGS. * configure.ac: Adjust to handle --enable-devel and similar macros in the same way as Spot.
49 lines
1.6 KiB
Text
49 lines
1.6 KiB
Text
dnl Check if the compiler supports useful warning options. There's a few that
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dnl we don't use, simply because they're too noisy:
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dnl
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dnl -ansi (prevents declaration of functions like strdup, and because
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dnl it makes warning in system headers).
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dnl -Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
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dnl -Wtraditional (combines too many unrelated messages, only a few useful)
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dnl -Wredundant-decls (system headers make this too noisy)
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dnl -pedantic
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dnl -Wunreachable-code (broken, see GCC PR/7827)
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dnl -Wredundant-decls (too many warnings in GLIBC's header with old GCC)
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dnl
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dnl A few other options have been left out because they are annoying in C++.
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AC_DEFUN([CF_GCC_WARNINGS],
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[if test -n "$GCC"; then
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AC_CACHE_CHECK([for $GCC warning options], ac_cv_prog_gcc_warn_flags,
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[
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cat > conftest.$ac_ext <<EOF
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#line __oline__ "configure"
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int main(int argc, char *argv[[]]) { return argv[[argc-1]] == 0; }
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EOF
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cf_save_CFLAGS="$CFLAGS"
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ac_cv_prog_gcc_warn_flags="-W -Wall"
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for cf_opt in \
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Wbad-function-cast \
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Wcast-align \
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Winline \
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Wnested-externs \
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Wpointer-arith \
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Wwrite-strings \
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Wmissing-declarations \
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Wmissing-prototypes \
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Wstrict-prototypes \
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Wshadow \
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Wcast-qual
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do
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CFLAGS="$cf_save_CFLAGS $ac_cv_prog_gcc_warn_flags -$cf_opt"
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if AC_TRY_EVAL(ac_compile); then
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ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -$cf_opt"
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test "$cf_opt" = Wcast-qual && ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -DXTSTRINGDEFINES"
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fi
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done
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rm -f conftest*
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CFLAGS="$cf_save_CFLAGS"
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])
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fi
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CFLAGS="$CFLAGS ${ac_cv_prog_gcc_warn_flags}"
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])
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