add NO_CONV_WARNINGS and disable the warnings for 8 and 16bit limbs

Author: minad

.travis.yml

@@ -91,14 +91,14 @@ matrix:
     # GCC for the x86-64 architecture with restricted limb sizes
     # formerly started with the option "--with-low-mp" to testme.sh
     # but testing all three in one run took to long and timed out.
-    - env:  BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_8BIT  --with-valgrind'
-    - env:  BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_16BIT --with-valgrind'
-    - env:  BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_32BIT --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_8BIT  --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_16BIT --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=gcc --cflags=-DMP_32BIT --with-valgrind'
 
     # clang for the x86-64 architecture with restricted limb sizes
-    - env:  BUILDOPTIONS='--with-cc=clang --cflags=-DMP_8BIT  --with-valgrind'
-    - env:  BUILDOPTIONS='--with-cc=clang --cflags=-DMP_16BIT --with-valgrind'
-    - env:  BUILDOPTIONS='--with-cc=clang --cflags=-DMP_32BIT --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=clang --cflags=-DMP_8BIT  --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=clang --cflags=-DMP_16BIT --with-valgrind'
+    - env:  NO_CONV_WARNINGS=1 BUILDOPTIONS='--with-cc=clang --cflags=-DMP_32BIT --with-valgrind'
 
     # GCC for the x86-64 architecture testing against a different Bigint-implementation
     # with 333333 different inputs.

makefile_include.mk

@@ -51,9 +51,13 @@ CFLAGS += -I./ -Wall -Wsign-compare -Wextra -Wshadow
 
 ifndef NO_ADDTL_WARNINGS
 # additional warnings
-#CFLAGS += -Wsystem-headers
 CFLAGS += -Wdeclaration-after-statement -Wbad-function-cast -Wcast-align
 CFLAGS += -Wstrict-prototypes -Wpointer-arith
+endif
+
+ifdef NO_CONV_WARNINGS
+CFLAGS += -Wsystem-headers
+else
 CFLAGS += -Wconversion -Wsign-conversion
 endif