since MSVC doesn't understand this flag, and the current
mechanism for building Julia with MSVC goes through the makefile
env:
# use JuliaLang caching (https://github.com/staticfloat/cache.julialang.org)
# so that Travis builds do not depend on anyone's flaky servers but our own
- - URLCACHE=https://cache.julialang.org/ CFLAGS="-O2 -Werror"
+ - URLCACHE=https://cache.julialang.org/ CFLAGS="-O2 -Werror -Wmissing-prototypes"
CFLAGS ?= -O2
PICFLAG = -fPIC
C99FLAG = -std=c99
-WCFLAGS = -Wall -Wmissing-prototypes -pedantic
+WCFLAGS = -Wall -pedantic
UCFLAGS = $(CFLAGS) $(PICFLAG) $(C99FLAG) $(WCFLAGS) -DUTF8PROC_EXPORTS
# shared-library version MAJOR.MINOR.PATCH ... this may be *different*