# Detect warning flags supported by the C and C++ compilers and append them to
# WARN_CFLAGS and WARN_CXXFLAGS.
# Detect warning flags supported by the C and C++ compilers and append them to
# WARN_CFLAGS and WARN_CXXFLAGS.
dnl We currently get this warning when building with Clang:
dnl
dnl /usr/include/setjmp.h:54:12: error: declaration of built-in function '__sigsetjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration]
dnl extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;
dnl ^
-Wno-incomplete-setjmp-declaration dnl
dnl We currently get this warning when building with Clang:
dnl
dnl /usr/include/setjmp.h:54:12: error: declaration of built-in function '__sigsetjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration]
dnl extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;
dnl ^
-Wno-incomplete-setjmp-declaration dnl
- dnl GCC enables this with -Wall in C++, and that generates a
- dnl lot of warnings that have on average a low value to fix.
- -Wno-sign-compare dnl
+])
+
+# Detect warning flags specific to the C compiler and append them to
+# WARN_CFLAGS.
+m4_define([WARN_FLAGS_C_LIST], [ dnl
+ -Wdiscarded-qualifiers dnl
+ -Wmissing-prototypes dnl
+ -Wmissing-parameter-type dnl
])
# Pass -Werror as an extra flag during the test: this is needed to make the
# -Wunknown-warning-option diagnostic fatal with clang.
AC_LANG_PUSH([C])
])
# Pass -Werror as an extra flag during the test: this is needed to make the
# -Wunknown-warning-option diagnostic fatal with clang.
AC_LANG_PUSH([C])
# Find a C++11 compiler with GNU extensions (-std=gnu++11)
AX_CXX_COMPILE_STDCXX([11], [ext], [mandatory])
# Find a C++11 compiler with GNU extensions (-std=gnu++11)
AX_CXX_COMPILE_STDCXX([11], [ext], [mandatory])
+# Detect warning flags specific to the C++ compiler and append them to
+# WARN_CXXFLAGS.
+m4_define([WARN_FLAGS_CXX_LIST], [ dnl
+ dnl GCC enables this with -Wall in C++, and that generates a
+ dnl lot of warnings that have on average a low value to fix.
+ -Wno-sign-compare dnl
+])
+
# Pass -Werror as an extra flag during the test: this is needed to make the
# -Wunknown-warning-option diagnostic fatal with clang.
AC_LANG_PUSH([C++])
# Pass -Werror as an extra flag during the test: this is needed to make the
# -Wunknown-warning-option diagnostic fatal with clang.
AC_LANG_PUSH([C++])